From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 19:32:43 +0200
Subject: Adding upstream version 1:115.7.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 tools/lint/android-api-lint.yml                    |   15 +
 tools/lint/android-checkstyle.yml                  |   15 +
 tools/lint/android-format.yml                      |   15 +
 tools/lint/android-javadoc.yml                     |   15 +
 tools/lint/android-lint.yml                        |   15 +
 tools/lint/android-test.yml                        |   15 +
 tools/lint/android/__init__.py                     |    0
 tools/lint/android/lints.py                        |  421 ++
 tools/lint/black.yml                               |   18 +
 tools/lint/clang-format.yml                        |   12 +
 tools/lint/clang-format/__init__.py                |  237 +
 tools/lint/clippy.yml                              |  107 +
 tools/lint/clippy/__init__.py                      |  113 +
 tools/lint/codespell.yml                           |   95 +
 tools/lint/cpp/__init__.py                         |    3 +
 tools/lint/cpp/mingw-capitalization.py             |   37 +
 tools/lint/cpp/mingw-headers.txt                   | 1452 ++++
 tools/lint/eslint.yml                              |   32 +
 tools/lint/eslint/.eslintrc.js                     |   30 +
 tools/lint/eslint/__init__.py                      |  280 +
 tools/lint/eslint/eslint-plugin-mozilla/.npmignore |    8 +
 tools/lint/eslint/eslint-plugin-mozilla/LICENSE    |  363 +
 tools/lint/eslint/eslint-plugin-mozilla/README.md  |   56 +
 .../eslint-plugin-mozilla/lib/configs/.eslintrc.js |    8 +
 .../lib/configs/browser-test.js                    |   91 +
 .../lib/configs/chrome-test.js                     |   61 +
 .../lib/configs/mochitest-test.js                  |   59 +
 .../lib/configs/recommended.js                     |  356 +
 .../lib/configs/require-jsdoc.js                   |   32 +
 .../lib/configs/valid-jsdoc.js                     |   25 +
 .../lib/configs/xpcshell-test.js                   |   50 +
 .../lib/environments/browser-window.js             |  119 +
 .../lib/environments/chrome-script.js              |   28 +
 .../lib/environments/chrome-worker.js              |   25 +
 .../lib/environments/frame-script.js               |   39 +
 .../eslint-plugin-mozilla/lib/environments/jsm.js  |   31 +
 .../lib/environments/privileged.js                 |  803 +++
 .../lib/environments/process-script.js             |   38 +
 .../lib/environments/remote-page.js                |   43 +
 .../lib/environments/simpletest.js                 |   35 +
 .../eslint-plugin-mozilla/lib/environments/sjs.js  |   30 +
 .../lib/environments/special-powers-sandbox.js     |   46 +
 .../lib/environments/specific.js                   |   31 +
 .../lib/environments/utils.js                      |   62 +
 .../lib/environments/xpcshell.js                   |   59 +
 .../eslint/eslint-plugin-mozilla/lib/globals.js    |  665 ++
 .../eslint/eslint-plugin-mozilla/lib/helpers.js    |  805 +++
 .../lint/eslint/eslint-plugin-mozilla/lib/index.js |   96 +
 .../lib/rules/avoid-Date-timing.js                 |   61 +
 .../lib/rules/avoid-removeChild.js                 |   70 +
 .../lib/rules/balanced-listeners.js                |  149 +
 .../lib/rules/balanced-observers.js                |  121 +
 .../lib/rules/consistent-if-bracing.js             |   54 +
 .../lib/rules/import-browser-window-globals.js     |   50 +
 .../lib/rules/import-content-task-globals.js       |   73 +
 .../lib/rules/import-globals.js                    |   21 +
 .../lib/rules/import-headjs-globals.js             |   51 +
 .../lib/rules/lazy-getter-object-name.js           |   48 +
 .../lib/rules/mark-exported-symbols-as-used.js     |   90 +
 .../lib/rules/mark-test-function-used.js           |   44 +
 .../eslint-plugin-mozilla/lib/rules/no-aArgs.js    |   57 +
 .../lib/rules/no-addtask-setup.js                  |   57 +
 .../lib/rules/no-arbitrary-setTimeout.js           |   65 +
 .../rules/no-compare-against-boolean-literals.js   |   40 +
 .../lib/rules/no-cu-reportError.js                 |  130 +
 .../lib/rules/no-define-cc-etc.js                  |   57 +
 .../lib/rules/no-redeclare-with-import-autofix.js  |  160 +
 .../lib/rules/no-throw-cr-literal.js               |  101 +
 .../lib/rules/no-useless-parameters.js             |  156 +
 .../lib/rules/no-useless-removeEventListener.js    |   69 +
 .../lib/rules/no-useless-run-test.js               |   76 +
 .../lib/rules/prefer-boolean-length-check.js       |  129 +
 .../lib/rules/prefer-formatValues.js               |   97 +
 .../lib/rules/reject-addtask-only.js               |   48 +
 .../lib/rules/reject-chromeutils-import-params.js  |   62 +
 .../rules/reject-eager-module-in-lazy-getter.js    |  103 +
 .../lib/rules/reject-global-this.js                |   40 +
 .../lib/rules/reject-globalThis-modification.js    |   70 +
 .../reject-import-system-module-from-non-system.js |   36 +
 .../lib/rules/reject-importGlobalProperties.js     |   94 +
 .../lib/rules/reject-lazy-imports-into-globals.js  |   76 +
 .../lib/rules/reject-mixing-eager-and-lazy.js      |  153 +
 .../lib/rules/reject-multiple-getters-calls.js     |   81 +
 .../lib/rules/reject-relative-requires.js          |   39 +
 .../lib/rules/reject-scriptableunicodeconverter.js |   41 +
 .../lib/rules/reject-some-requires.js              |   41 +
 .../lib/rules/reject-top-level-await.js            |   45 +
 .../lib/rules/rejects-requires-await.js            |   47 +
 .../eslint-plugin-mozilla/lib/rules/use-cc-etc.js  |   52 +
 .../lib/rules/use-chromeutils-generateqi.js        |  105 +
 .../lib/rules/use-chromeutils-import.js            |   78 +
 .../lib/rules/use-default-preference-values.js     |   52 +
 .../lib/rules/use-includes-instead-of-indexOf.js   |   50 +
 .../lib/rules/use-isInstance.js                    |  154 +
 .../lib/rules/use-ownerGlobal.js                   |   40 +
 .../lib/rules/use-returnValue.js                   |   41 +
 .../lib/rules/use-services.js                      |  104 +
 .../lib/rules/use-static-import.js                 |   87 +
 .../lib/rules/valid-ci-uses.js                     |  167 +
 .../eslint-plugin-mozilla/lib/rules/valid-lazy.js  |  221 +
 .../lib/rules/valid-services-property.js           |  126 +
 .../lib/rules/valid-services.js                    |   62 +
 .../lib/rules/var-only-at-top-level.js             |   39 +
 .../eslint/eslint-plugin-mozilla/lib/services.json |   62 +
 .../lint/eslint/eslint-plugin-mozilla/manifest.tt  |   10 +
 .../eslint/eslint-plugin-mozilla/package-lock.json | 6924 ++++++++++++++++++++
 .../lint/eslint/eslint-plugin-mozilla/package.json |   53 +
 .../reporters/mozilla-format.js                    |   57 +
 .../eslint-plugin-mozilla/scripts/createExports.js |   77 +
 .../tests/avoid-Date-timing.js                     |   34 +
 .../tests/avoid-removeChild.js                     |   37 +
 .../tests/balanced-listeners.js                    |  100 +
 .../tests/balanced-observers.js                    |   80 +
 .../tests/consistent-if-bracing.js                 |   39 +
 .../eslint/eslint-plugin-mozilla/tests/globals.js  |  161 +
 .../tests/lazy-getter-object-name.js               |   51 +
 .../tests/mark-exported-symbols-as-used.js         |   45 +
 .../tests/no-addtask-setup.js                      |   69 +
 .../tests/no-arbitrary-setTimeout.js               |   39 +
 .../tests/no-compare-against-boolean-literals.js   |   59 +
 .../tests/no-cu-reportError.js                     |  100 +
 .../tests/no-define-cc-etc.js                      |   63 +
 .../tests/no-redeclare-with-import-autofix.js      |   77 +
 .../tests/no-throw-cr-literal.js                   |   62 +
 .../tests/no-useless-parameters.js                 |  175 +
 .../tests/no-useless-removeEventListener.js        |   96 +
 .../tests/no-useless-run-test.js                   |  126 +
 .../tests/prefer-boolean-length-check.js           |   96 +
 .../tests/prefer-formatValues.js                   |   70 +
 .../tests/reject-addtask-only.js                   |   56 +
 .../tests/reject-chromeutils-import-params.js      |   67 +
 .../tests/reject-eager-module-in-lazy-getter.js    |   80 +
 .../tests/reject-global-this.js                    |   49 +
 .../tests/reject-globalThis-modification.js        |   90 +
 .../reject-import-system-module-from-non-system.js |   33 +
 .../tests/reject-importGlobalProperties.js         |   87 +
 .../tests/reject-lazy-imports-into-globals.js      |   56 +
 .../tests/reject-mixing-eager-and-lazy.js          |  124 +
 .../tests/reject-multiple-getters-calls.js         |   60 +
 .../tests/reject-relative-requires.js              |   57 +
 .../tests/reject-scriptableunicodeconverter.js     |   33 +
 .../tests/reject-some-requires.js                  |   49 +
 .../tests/reject-top-level-await.js                |   36 +
 .../tests/rejects-requires-await.js                |   32 +
 .../eslint-plugin-mozilla/tests/use-cc-etc.js      |   60 +
 .../tests/use-chromeutils-generateqi.js            |   81 +
 .../tests/use-chromeutils-import.js                |   65 +
 .../tests/use-default-preference-values.js         |   41 +
 .../tests/use-includes-instead-of-indexOf.js       |   38 +
 .../eslint-plugin-mozilla/tests/use-isInstance.js  |  130 +
 .../eslint-plugin-mozilla/tests/use-ownerGlobal.js |   35 +
 .../eslint-plugin-mozilla/tests/use-returnValue.js |   39 +
 .../eslint-plugin-mozilla/tests/use-services.js    |   60 +
 .../tests/use-static-import.js                     |   80 +
 .../eslint-plugin-mozilla/tests/valid-ci-uses.js   |   58 +
 .../eslint-plugin-mozilla/tests/valid-lazy.js      |  176 +
 .../tests/valid-services-property.js               |   42 +
 .../eslint-plugin-mozilla/tests/valid-services.js  |   33 +
 .../eslint-plugin-mozilla/tests/xpidl/docshell.xpt | 6077 +++++++++++++++++
 .../tests/xpidl/xpcom_base.xpt                     | 3197 +++++++++
 tools/lint/eslint/eslint-plugin-mozilla/update.sh  |   61 +
 .../eslint/eslint-plugin-spidermonkey-js/LICENSE   |  363 +
 .../lib/environments/self-hosted.js                |  180 +
 .../eslint-plugin-spidermonkey-js/lib/index.js     |   20 +
 .../lib/processors/self-hosted.js                  |  128 +
 .../eslint-plugin-spidermonkey-js/package.json     |   28 +
 tools/lint/eslint/manifest.tt                      |   10 +
 tools/lint/eslint/setup_helper.py                  |  432 ++
 tools/lint/eslint/update.sh                        |   71 +
 tools/lint/file-perm.yml                           |   53 +
 tools/lint/file-perm/__init__.py                   |   45 +
 tools/lint/file-whitespace.yml                     |  160 +
 tools/lint/file-whitespace/__init__.py             |  124 +
 tools/lint/fluent-lint.yml                         |   13 +
 tools/lint/fluent-lint/__init__.py                 |  470 ++
 tools/lint/fluent-lint/exclusions.yml              |  198 +
 tools/lint/hooks.py                                |   63 +
 tools/lint/hooks_clang_format.py                   |   99 +
 tools/lint/hooks_js_format.py                      |   83 +
 tools/lint/l10n.yml                                |   37 +
 tools/lint/libpref/__init__.py                     |  112 +
 tools/lint/license.yml                             |   94 +
 tools/lint/license/__init__.py                     |  195 +
 tools/lint/license/valid-licenses.txt              |   30 +
 tools/lint/lintpref.yml                            |   17 +
 tools/lint/mach_commands.py                        |  189 +
 tools/lint/mingw-capitalization.yml                |   12 +
 tools/lint/mscom-init.yml                          |   46 +
 tools/lint/perfdocs.yml                            |   17 +
 tools/lint/perfdocs/__init__.py                    |   13 +
 tools/lint/perfdocs/doc_helpers.py                 |   85 +
 tools/lint/perfdocs/framework_gatherers.py         |  571 ++
 tools/lint/perfdocs/gatherer.py                    |  156 +
 tools/lint/perfdocs/generator.py                   |  281 +
 tools/lint/perfdocs/logger.py                      |   81 +
 tools/lint/perfdocs/perfdocs.py                    |   95 +
 tools/lint/perfdocs/templates/index.rst            |   86 +
 tools/lint/perfdocs/utils.py                       |  157 +
 tools/lint/perfdocs/verifier.py                    |  601 ++
 tools/lint/python/__init__.py                      |    3 +
 tools/lint/python/black.py                         |  179 +
 tools/lint/python/black_requirements.in            |    4 +
 tools/lint/python/black_requirements.txt           |  117 +
 tools/lint/python/l10n_lint.py                     |  171 +
 tools/lint/python/ruff.py                          |  187 +
 tools/lint/python/ruff_requirements.in             |    1 +
 tools/lint/python/ruff_requirements.txt            |   25 +
 tools/lint/rejected-words.yml                      |  335 +
 tools/lint/rst.yml                                 |   11 +
 tools/lint/rst/__init__.py                         |  116 +
 tools/lint/rst/requirements.in                     |   19 +
 tools/lint/rst/requirements.txt                    |  210 +
 tools/lint/ruff.yml                                |   17 +
 tools/lint/rust/__init__.py                        |  180 +
 tools/lint/rustfmt.yml                             |   20 +
 tools/lint/shell/__init__.py                       |  148 +
 tools/lint/shellcheck.yml                          |   15 +
 tools/lint/spell/__init__.py                       |  168 +
 tools/lint/spell/codespell_requirements.in         |    1 +
 tools/lint/spell/codespell_requirements.txt        |   10 +
 tools/lint/spell/exclude-list.txt                  |   23 +
 tools/lint/stylelint.yml                           |   15 +
 tools/lint/stylelint/__init__.py                   |  187 +
 tools/lint/test-manifest-alpha.yml                 |   19 +
 tools/lint/test-manifest-alpha/__init__.py         |   77 +
 .../test-manifest-alpha/error-level-manifests.yml  |    7 +
 tools/lint/test-manifest-disable.yml               |   16 +
 tools/lint/test-manifest-skip-if.yml               |   18 +
 tools/lint/test/conftest.py                        |  305 +
 tools/lint/test/files/android-format/Bad.java      |    8 +
 tools/lint/test/files/android-format/Main.kt       |    7 +
 tools/lint/test/files/android-format/build.gradle  |    1 +
 tools/lint/test/files/black/bad.py                 |    6 +
 tools/lint/test/files/black/invalid.py             |    4 +
 tools/lint/test/files/clang-format/bad/bad.cpp     |    6 +
 tools/lint/test/files/clang-format/bad/bad2.c      |    8 +
 tools/lint/test/files/clang-format/bad/bad2.h      |    1 +
 tools/lint/test/files/clang-format/bad/good.cpp    |    1 +
 tools/lint/test/files/clang-format/good/foo.cpp    |    1 +
 tools/lint/test/files/clippy/test1/Cargo.toml      |   17 +
 tools/lint/test/files/clippy/test1/bad.rs          |   14 +
 tools/lint/test/files/clippy/test1/bad2.rs         |   14 +
 tools/lint/test/files/clippy/test1/good.rs         |    6 +
 tools/lint/test/files/clippy/test2/Cargo.lock      |    5 +
 tools/lint/test/files/clippy/test2/Cargo.toml      |    8 +
 tools/lint/test/files/clippy/test2/src/bad_1.rs    |   15 +
 tools/lint/test/files/clippy/test2/src/bad_2.rs    |   17 +
 tools/lint/test/files/codespell/ignore.rst         |    5 +
 tools/lint/test/files/eslint/good.js               |    0
 tools/lint/test/files/eslint/import/bad_import.js  |    1 +
 tools/lint/test/files/eslint/nolint/foo.txt        |    0
 tools/lint/test/files/eslint/subdir/bad.js         |    2 +
 tools/lint/test/files/eslint/testprettierignore    |    1 +
 .../lint/test/files/file-perm/maybe-shebang/bad.js |    2 +
 .../test/files/file-perm/maybe-shebang/good.js     |    5 +
 .../test/files/file-perm/no-shebang/bad-shebang.c  |    2 +
 tools/lint/test/files/file-perm/no-shebang/bad.c   |    1 +
 tools/lint/test/files/file-perm/no-shebang/bad.png |  Bin 0 -> 49 bytes
 tools/lint/test/files/file-perm/no-shebang/good.c  |    1 +
 .../lint/test/files/file-whitespace/bad-newline.c  |    3 +
 .../lint/test/files/file-whitespace/bad-windows.c  |    3 +
 tools/lint/test/files/file-whitespace/bad.c        |    3 +
 tools/lint/test/files/file-whitespace/bad.js       |    3 +
 tools/lint/test/files/file-whitespace/good.c       |    1 +
 tools/lint/test/files/file-whitespace/good.js      |    5 +
 tools/lint/test/files/fluent-lint/bad.ftl          |   44 +
 .../files/fluent-lint/brand-names-excluded.ftl     |    2 +
 tools/lint/test/files/fluent-lint/brand-names.ftl  |   30 +
 .../lint/test/files/fluent-lint/comment-group1.ftl |   35 +
 .../lint/test/files/fluent-lint/comment-group2.ftl |   15 +
 .../test/files/fluent-lint/comment-resource1.ftl   |   11 +
 .../test/files/fluent-lint/comment-resource2.ftl   |    6 +
 .../test/files/fluent-lint/comment-resource3.ftl   |    6 +
 .../test/files/fluent-lint/comment-resource4.ftl   |    8 +
 .../test/files/fluent-lint/comment-resource5.ftl   |    8 +
 .../test/files/fluent-lint/comment-resource6.ftl   |    4 +
 .../test/files/fluent-lint/comment-variables1.ftl  |   60 +
 .../test/files/fluent-lint/comment-variables2.ftl  |   27 +
 tools/lint/test/files/fluent-lint/excluded.ftl     |    6 +
 tools/lint/test/files/fluent-lint/test-brands.ftl  |    5 +
 .../tools/lint/fluent-lint/exclusions.yml          |   17 +
 tools/lint/test/files/license/.eslintrc.js         |    5 +
 tools/lint/test/files/license/bad.c                |    1 +
 tools/lint/test/files/license/bad.js               |    6 +
 tools/lint/test/files/license/good-other.h         |    9 +
 tools/lint/test/files/license/good.c               |    8 +
 tools/lint/test/files/license/good.js              |    7 +
 tools/lint/test/files/lintpref/bad.js              |    2 +
 tools/lint/test/files/lintpref/good.js             |    6 +
 tools/lint/test/files/rst/.dotfile.rst             |   11 +
 tools/lint/test/files/rst/bad.rst                  |   20 +
 tools/lint/test/files/rst/bad2.rst                 |    4 +
 tools/lint/test/files/rst/bad3.rst                 |    6 +
 tools/lint/test/files/rst/good.rst                 |   11 +
 tools/lint/test/files/ruff/bad.py                  |    4 +
 tools/lint/test/files/ruff/ruff.toml               |    1 +
 tools/lint/test/files/rustfmt/subdir/bad.rs        |   16 +
 tools/lint/test/files/rustfmt/subdir/bad2.rs       |   17 +
 tools/lint/test/files/rustfmt/subdir/good.rs       |    6 +
 tools/lint/test/files/shellcheck/bad.sh            |    3 +
 tools/lint/test/files/shellcheck/good.sh           |    2 +
 tools/lint/test/files/stylelint/nolint/foo.txt     |    0
 tools/lint/test/files/stylelint/subdir/bad.css     |    5 +
 .../test-manifest-alpha/mochitest-in-order.ini     |   29 +
 .../mochitest-mostly-in-order.ini                  |   30 +
 .../mochitest-very-out-of-order.ini                |   29 +
 .../other-ini-very-out-of-order.ini                |   29 +
 tools/lint/test/files/trojan-source/README         |    5 +
 .../test/files/trojan-source/commenting-out.cpp    |    9 +
 .../lint/test/files/trojan-source/early-return.py  |    9 +
 .../test/files/trojan-source/invisible-function.rs |   15 +
 tools/lint/test/files/updatebot/.yamllint          |    6 +
 .../lint/test/files/updatebot/cargo-mismatch.yaml  |   44 +
 tools/lint/test/files/updatebot/good1.yaml         |   44 +
 tools/lint/test/files/updatebot/good2.yaml         |   74 +
 tools/lint/test/files/updatebot/no-revision.yaml   |   43 +
 tools/lint/test/files/yaml/.yamllint               |    6 +
 tools/lint/test/files/yaml/bad.yml                 |    8 +
 tools/lint/test/files/yaml/good.yml                |    6 +
 tools/lint/test/python.ini                         |   35 +
 tools/lint/test/test_android_format.py             |   38 +
 tools/lint/test/test_black.py                      |   53 +
 tools/lint/test/test_clang_format.py               |  139 +
 tools/lint/test/test_codespell.py                  |   37 +
 tools/lint/test/test_eslint.py                     |   99 +
 tools/lint/test/test_file_license.py               |   23 +
 tools/lint/test/test_file_perm.py                  |   35 +
 tools/lint/test/test_file_whitespace.py            |   51 +
 tools/lint/test/test_fluent_lint.py                |  156 +
 tools/lint/test/test_lintpref.py                   |   16 +
 tools/lint/test/test_manifest_alpha.py             |   33 +
 tools/lint/test/test_perfdocs.py                   |  858 +++
 tools/lint/test/test_perfdocs_generation.py        |  297 +
 tools/lint/test/test_perfdocs_helpers.py           |  206 +
 tools/lint/test/test_rst.py                        |   25 +
 tools/lint/test/test_ruff.py                       |   39 +
 tools/lint/test/test_rustfmt.py                    |   70 +
 tools/lint/test/test_shellcheck.py                 |   26 +
 tools/lint/test/test_stylelint.py                  |   65 +
 tools/lint/test/test_trojan_source.py              |   25 +
 tools/lint/test/test_updatebot.py                  |   44 +
 tools/lint/test/test_yaml.py                       |   28 +
 tools/lint/tox/tox_requirements.txt                |    7 +
 tools/lint/trojan-source.yml                       |   27 +
 tools/lint/trojan-source/__init__.py               |   67 +
 tools/lint/updatebot.yml                           |    9 +
 tools/lint/updatebot/__init__.py                   |    3 +
 tools/lint/updatebot/validate_yaml.py              |   52 +
 tools/lint/wpt.yml                                 |   10 +
 tools/lint/wpt/__init__.py                         |    3 +
 tools/lint/wpt/wpt.py                              |   59 +
 tools/lint/yaml.yml                                |   19 +
 tools/lint/yamllint_/__init__.py                   |  101 +
 353 files changed, 43086 insertions(+)
 create mode 100644 tools/lint/android-api-lint.yml
 create mode 100644 tools/lint/android-checkstyle.yml
 create mode 100644 tools/lint/android-format.yml
 create mode 100644 tools/lint/android-javadoc.yml
 create mode 100644 tools/lint/android-lint.yml
 create mode 100644 tools/lint/android-test.yml
 create mode 100644 tools/lint/android/__init__.py
 create mode 100644 tools/lint/android/lints.py
 create mode 100644 tools/lint/black.yml
 create mode 100644 tools/lint/clang-format.yml
 create mode 100644 tools/lint/clang-format/__init__.py
 create mode 100644 tools/lint/clippy.yml
 create mode 100644 tools/lint/clippy/__init__.py
 create mode 100644 tools/lint/codespell.yml
 create mode 100644 tools/lint/cpp/__init__.py
 create mode 100644 tools/lint/cpp/mingw-capitalization.py
 create mode 100644 tools/lint/cpp/mingw-headers.txt
 create mode 100644 tools/lint/eslint.yml
 create mode 100644 tools/lint/eslint/.eslintrc.js
 create mode 100644 tools/lint/eslint/__init__.py
 create mode 100644 tools/lint/eslint/eslint-plugin-mozilla/.npmignore
 create mode 100644 tools/lint/eslint/eslint-plugin-mozilla/LICENSE
 create mode 100644 tools/lint/eslint/eslint-plugin-mozilla/README.md
 create mode 100644 tools/lint/eslint/eslint-plugin-mozilla/lib/configs/.eslintrc.js
 create mode 100644 tools/lint/eslint/eslint-plugin-mozilla/lib/configs/browser-test.js
 create mode 100644 tools/lint/eslint/eslint-plugin-mozilla/lib/configs/chrome-test.js
 create mode 100644 tools/lint/eslint/eslint-plugin-mozilla/lib/configs/mochitest-test.js
 create mode 100644 tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js
 create mode 100644 tools/lint/eslint/eslint-plugin-mozilla/lib/configs/require-jsdoc.js
 create mode 100644 tools/lint/eslint/eslint-plugin-mozilla/lib/configs/valid-jsdoc.js
 create mode 100644 tools/lint/eslint/eslint-plugin-mozilla/lib/configs/xpcshell-test.js
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(limited to 'tools/lint')

diff --git a/tools/lint/android-api-lint.yml b/tools/lint/android-api-lint.yml
new file mode 100644
index 0000000000..0b81e79a83
--- /dev/null
+++ b/tools/lint/android-api-lint.yml
@@ -0,0 +1,15 @@
+---
+android-api-lint:
+    description: Android api-lint
+    include: ['mobile/android']
+    exclude: []
+    extensions: ['java', 'kt']
+    support-files:
+        - 'mobile/android/**/Makefile.in'
+        - 'mobile/android/config/**'
+        - 'mobile/android/gradle.configure'
+        - 'mobile/android/**/moz.build'
+        - '**/*.gradle'
+    type: global
+    payload: android.lints:api_lint
+    setup: android.lints:setup
diff --git a/tools/lint/android-checkstyle.yml b/tools/lint/android-checkstyle.yml
new file mode 100644
index 0000000000..abd4974e6a
--- /dev/null
+++ b/tools/lint/android-checkstyle.yml
@@ -0,0 +1,15 @@
+---
+android-checkstyle:
+    description: Android checkstyle
+    include: ['mobile/android']
+    exclude: []
+    extensions: ['java', 'kt']
+    support-files:
+        - 'mobile/android/**/Makefile.in'
+        - 'mobile/android/config/**'
+        - 'mobile/android/gradle.configure'
+        - 'mobile/android/**/moz.build'
+        - '**/*.gradle'
+    type: global
+    payload: android.lints:checkstyle
+    setup: android.lints:setup
diff --git a/tools/lint/android-format.yml b/tools/lint/android-format.yml
new file mode 100644
index 0000000000..cacf3ff2d7
--- /dev/null
+++ b/tools/lint/android-format.yml
@@ -0,0 +1,15 @@
+---
+android-format:
+    description: Android formatting lint
+    include: ['mobile/android']
+    exclude: []
+    extensions: ['java', 'kt']
+    support-files:
+        - 'mobile/android/**/Makefile.in'
+        - 'mobile/android/config/**'
+        - 'mobile/android/gradle.configure'
+        - 'mobile/android/**/moz.build'
+        - '**/*.gradle'
+    type: global
+    payload: android.lints:format
+    setup: android.lints:setup
diff --git a/tools/lint/android-javadoc.yml b/tools/lint/android-javadoc.yml
new file mode 100644
index 0000000000..a0811a08cd
--- /dev/null
+++ b/tools/lint/android-javadoc.yml
@@ -0,0 +1,15 @@
+---
+android-javadoc:
+    description: Android javadoc
+    include: ['mobile/android/geckoview']
+    exclude: []
+    extensions: ['java', 'kt']
+    support-files:
+        - 'mobile/android/**/Makefile.in'
+        - 'mobile/android/config/**'
+        - 'mobile/android/gradle.configure'
+        - 'mobile/android/**/moz.build'
+        - '**/*.gradle'
+    type: global
+    payload: android.lints:javadoc
+    setup: android.lints:setup
diff --git a/tools/lint/android-lint.yml b/tools/lint/android-lint.yml
new file mode 100644
index 0000000000..6a1dbe7b74
--- /dev/null
+++ b/tools/lint/android-lint.yml
@@ -0,0 +1,15 @@
+---
+android-lint:
+    description: Android lint
+    include: ['mobile/android']
+    exclude: []
+    extensions: ['java', 'kt']
+    support-files:
+        - 'mobile/android/**/Makefile.in'
+        - 'mobile/android/config/**'
+        - 'mobile/android/gradle.configure'
+        - 'mobile/android/**/moz.build'
+        - '**/*.gradle'
+    type: global
+    payload: android.lints:lint
+    setup: android.lints:setup
diff --git a/tools/lint/android-test.yml b/tools/lint/android-test.yml
new file mode 100644
index 0000000000..65739295dd
--- /dev/null
+++ b/tools/lint/android-test.yml
@@ -0,0 +1,15 @@
+---
+android-test:
+    description: Android test
+    include: ['mobile/android']
+    exclude: []
+    extensions: ['java', 'kt']
+    support-files:
+        - 'mobile/android/**/Makefile.in'
+        - 'mobile/android/config/**'
+        - 'mobile/android/gradle.configure'
+        - 'mobile/android/**/moz.build'
+        - '**/*.gradle'
+    type: global
+    payload: android.lints:test
+    setup: android.lints:setup
diff --git a/tools/lint/android/__init__.py b/tools/lint/android/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tools/lint/android/lints.py b/tools/lint/android/lints.py
new file mode 100644
index 0000000000..a0ec59e805
--- /dev/null
+++ b/tools/lint/android/lints.py
@@ -0,0 +1,421 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import glob
+import itertools
+import json
+import os
+import re
+import subprocess
+import sys
+import xml.etree.ElementTree as ET
+
+import mozpack.path as mozpath
+import six
+from mozlint import result
+from mozpack.files import FileFinder
+
+# The Gradle target invocations are serialized with a simple locking file scheme.  It's fine for
+# them to take a while, since the first will compile all the Java, etc, and then perform
+# potentially expensive static analyses.
+GRADLE_LOCK_MAX_WAIT_SECONDS = 20 * 60
+
+
+def setup(root, **setupargs):
+    if setupargs.get("substs", {}).get("MOZ_BUILD_APP") != "mobile/android":
+        return 1
+
+    if "topobjdir" not in setupargs:
+        print(
+            "Skipping {}: a configured Android build is required!".format(
+                setupargs["name"]
+            )
+        )
+        return 1
+
+    return 0
+
+
+def gradle(log, topsrcdir=None, topobjdir=None, tasks=[], extra_args=[], verbose=True):
+    sys.path.insert(0, os.path.join(topsrcdir, "mobile", "android"))
+    from gradle import gradle_lock
+
+    with gradle_lock(topobjdir, max_wait_seconds=GRADLE_LOCK_MAX_WAIT_SECONDS):
+        # The android-lint parameter can be used by gradle tasks to run special
+        # logic when they are run for a lint using
+        #   project.hasProperty('android-lint')
+        cmd_args = (
+            [
+                sys.executable,
+                os.path.join(topsrcdir, "mach"),
+                "gradle",
+                "--verbose",
+                "-Pandroid-lint",
+                "--",
+            ]
+            + tasks
+            + extra_args
+        )
+
+        cmd = " ".join(six.moves.shlex_quote(arg) for arg in cmd_args)
+        log.debug(cmd)
+
+        # Gradle and mozprocess do not get along well, so we use subprocess
+        # directly.
+        proc = subprocess.Popen(cmd_args, cwd=topsrcdir)
+        status = None
+        # Leave it to the subprocess to handle Ctrl+C. If it terminates as a result
+        # of Ctrl+C, proc.wait() will return a status code, and, we get out of the
+        # loop. If it doesn't, like e.g. gdb, we continue waiting.
+        while status is None:
+            try:
+                status = proc.wait()
+            except KeyboardInterrupt:
+                pass
+
+        try:
+            proc.wait()
+        except KeyboardInterrupt:
+            proc.kill()
+            raise
+
+        return proc.returncode
+
+
+def format(config, fix=None, **lintargs):
+    topsrcdir = lintargs["root"]
+    topobjdir = lintargs["topobjdir"]
+
+    if fix:
+        tasks = lintargs["substs"]["GRADLE_ANDROID_FORMAT_LINT_FIX_TASKS"]
+    else:
+        tasks = lintargs["substs"]["GRADLE_ANDROID_FORMAT_LINT_CHECK_TASKS"]
+
+    ret = gradle(
+        lintargs["log"],
+        topsrcdir=topsrcdir,
+        topobjdir=topobjdir,
+        tasks=tasks,
+        extra_args=lintargs.get("extra_args") or [],
+    )
+
+    results = []
+    for path in lintargs["substs"]["GRADLE_ANDROID_FORMAT_LINT_FOLDERS"]:
+        folder = os.path.join(
+            topobjdir, "gradle", "build", path, "spotless", "spotlessJava"
+        )
+        for filename in glob.iglob(folder + "/**/*.java", recursive=True):
+            err = {
+                "rule": "spotless-java",
+                "path": os.path.join(
+                    topsrcdir, path, mozpath.relpath(filename, folder)
+                ),
+                "lineno": 0,
+                "column": 0,
+                "message": "Formatting error, please run ./mach lint -l android-format --fix",
+                "level": "error",
+            }
+            results.append(result.from_config(config, **err))
+        folder = os.path.join(
+            topobjdir, "gradle", "build", path, "spotless", "spotlessKotlin"
+        )
+        for filename in glob.iglob(folder + "/**/*.kt", recursive=True):
+            err = {
+                "rule": "spotless-kt",
+                "path": os.path.join(
+                    topsrcdir, path, mozpath.relpath(filename, folder)
+                ),
+                "lineno": 0,
+                "column": 0,
+                "message": "Formatting error, please run ./mach lint -l android-format --fix",
+                "level": "error",
+            }
+            results.append(result.from_config(config, **err))
+
+    if len(results) == 0 and ret != 0:
+        # spotless seems to hit unfixed error.
+        err = {
+            "rule": "spotless",
+            "path": "",
+            "lineno": 0,
+            "column": 0,
+            "message": "Unexpected error",
+            "level": "error",
+        }
+        results.append(result.from_config(config, **err))
+
+    # If --fix was passed, we just report the number of files that were changed
+    if fix:
+        return {"results": [], "fixed": len(results)}
+    return results
+
+
+def api_lint(config, **lintargs):
+    topsrcdir = lintargs["root"]
+    topobjdir = lintargs["topobjdir"]
+
+    gradle(
+        lintargs["log"],
+        topsrcdir=topsrcdir,
+        topobjdir=topobjdir,
+        tasks=lintargs["substs"]["GRADLE_ANDROID_API_LINT_TASKS"],
+        extra_args=lintargs.get("extra_args") or [],
+    )
+
+    folder = lintargs["substs"]["GRADLE_ANDROID_GECKOVIEW_APILINT_FOLDER"]
+
+    results = []
+
+    with open(os.path.join(topobjdir, folder, "apilint-result.json")) as f:
+        issues = json.load(f)
+
+        for rule in ("compat_failures", "failures"):
+            for r in issues[rule]:
+                err = {
+                    "rule": r["rule"] if rule == "failures" else "compat_failures",
+                    "path": r["file"],
+                    "lineno": int(r["line"]),
+                    "column": int(r.get("column") or 0),
+                    "message": r["msg"],
+                    "level": "error" if r["error"] else "warning",
+                }
+                results.append(result.from_config(config, **err))
+
+        for r in issues["api_changes"]:
+            err = {
+                "rule": "api_changes",
+                "path": r["file"],
+                "lineno": int(r["line"]),
+                "column": int(r.get("column") or 0),
+                "message": "Unexpected api change. Please run ./mach gradle {} for more "
+                "information".format(
+                    " ".join(lintargs["substs"]["GRADLE_ANDROID_API_LINT_TASKS"])
+                ),
+            }
+            results.append(result.from_config(config, **err))
+
+    return results
+
+
+def javadoc(config, **lintargs):
+    topsrcdir = lintargs["root"]
+    topobjdir = lintargs["topobjdir"]
+
+    gradle(
+        lintargs["log"],
+        topsrcdir=topsrcdir,
+        topobjdir=topobjdir,
+        tasks=lintargs["substs"]["GRADLE_ANDROID_GECKOVIEW_DOCS_TASKS"],
+        extra_args=lintargs.get("extra_args") or [],
+    )
+
+    output_files = lintargs["substs"]["GRADLE_ANDROID_GECKOVIEW_DOCS_OUTPUT_FILES"]
+
+    results = []
+
+    for output_file in output_files:
+        with open(os.path.join(topobjdir, output_file)) as f:
+            # Like: '[{"path":"/absolute/path/to/topsrcdir/mobile/android/geckoview/src/main/java/org/mozilla/geckoview/ContentBlocking.java","lineno":"462","level":"warning","message":"no @return"}]'.  # NOQA: E501
+            issues = json.load(f)
+
+            for issue in issues:
+                # We want warnings to be errors for linting purposes.
+                # TODO: Bug 1316188 - resolve missing javadoc comments
+                issue["level"] = (
+                    "error" if issue["message"] != ": no comment" else "warning"
+                )
+                results.append(result.from_config(config, **issue))
+
+    return results
+
+
+def lint(config, **lintargs):
+    topsrcdir = lintargs["root"]
+    topobjdir = lintargs["topobjdir"]
+
+    gradle(
+        lintargs["log"],
+        topsrcdir=topsrcdir,
+        topobjdir=topobjdir,
+        tasks=lintargs["substs"]["GRADLE_ANDROID_LINT_TASKS"],
+        extra_args=lintargs.get("extra_args") or [],
+    )
+
+    # It's surprising that this is the App variant name, but this is "withoutGeckoBinariesDebug"
+    # right now and the GeckoView variant name is "withGeckoBinariesDebug".  This will be addressed
+    # as we unify variants.
+    path = os.path.join(
+        lintargs["topobjdir"],
+        "gradle/build/mobile/android/geckoview/reports",
+        "lint-results-{}.xml".format(
+            lintargs["substs"]["GRADLE_ANDROID_GECKOVIEW_VARIANT_NAME"]
+        ),
+    )
+    tree = ET.parse(open(path, "rt"))
+    root = tree.getroot()
+
+    results = []
+
+    for issue in root.findall("issue"):
+        location = issue[0]
+        if "third_party" in location.get("file") or "thirdparty" in location.get(
+            "file"
+        ):
+            continue
+        err = {
+            "level": issue.get("severity").lower(),
+            "rule": issue.get("id"),
+            "message": issue.get("message"),
+            "path": location.get("file"),
+            "lineno": int(location.get("line") or 0),
+        }
+        results.append(result.from_config(config, **err))
+
+    return results
+
+
+def _parse_checkstyle_output(config, topsrcdir=None, report_path=None):
+    tree = ET.parse(open(report_path, "rt"))
+    root = tree.getroot()
+
+    for file in root.findall("file"):
+
+        for error in file.findall("error"):
+            # Like <error column="42" line="22" message="Name 'mPorts' must match pattern 'xm[A-Z][A-Za-z]*$'." severity="error" source="com.puppycrawl.tools.checkstyle.checks.naming.MemberNameCheck" />.  # NOQA: E501
+            err = {
+                "level": "error",
+                "rule": error.get("source"),
+                "message": error.get("message"),
+                "path": file.get("name"),
+                "lineno": int(error.get("line") or 0),
+                "column": int(error.get("column") or 0),
+            }
+            yield result.from_config(config, **err)
+
+
+def checkstyle(config, **lintargs):
+    topsrcdir = lintargs["root"]
+    topobjdir = lintargs["topobjdir"]
+
+    gradle(
+        lintargs["log"],
+        topsrcdir=topsrcdir,
+        topobjdir=topobjdir,
+        tasks=lintargs["substs"]["GRADLE_ANDROID_CHECKSTYLE_TASKS"],
+        extra_args=lintargs.get("extra_args") or [],
+    )
+
+    results = []
+
+    for relative_path in lintargs["substs"]["GRADLE_ANDROID_CHECKSTYLE_OUTPUT_FILES"]:
+        report_path = os.path.join(lintargs["topobjdir"], relative_path)
+        results.extend(
+            _parse_checkstyle_output(
+                config, topsrcdir=lintargs["root"], report_path=report_path
+            )
+        )
+
+    return results
+
+
+def _parse_android_test_results(config, topsrcdir=None, report_dir=None):
+    # A brute force way to turn a Java FQN into a path on disk.  Assumes Java
+    # and Kotlin sources are in mobile/android for performance and simplicity.
+    sourcepath_finder = FileFinder(os.path.join(topsrcdir, "mobile", "android"))
+
+    finder = FileFinder(report_dir)
+    reports = list(finder.find("TEST-*.xml"))
+    if not reports:
+        raise RuntimeError("No reports found under {}".format(report_dir))
+
+    for report, _ in reports:
+        tree = ET.parse(open(os.path.join(finder.base, report), "rt"))
+        root = tree.getroot()
+
+        class_name = root.get(
+            "name"
+        )  # Like 'org.mozilla.gecko.permissions.TestPermissions'.
+        path = (
+            "**/" + class_name.replace(".", "/") + ".*"
+        )  # Like '**/org/mozilla/gecko/permissions/TestPermissions.*'.  # NOQA: E501
+
+        for testcase in root.findall("testcase"):
+            function_name = testcase.get("name")
+
+            # Schema cribbed from http://llg.cubic.org/docs/junit/.
+            for unexpected in itertools.chain(
+                testcase.findall("error"), testcase.findall("failure")
+            ):
+                sourcepaths = list(sourcepath_finder.find(path))
+                if not sourcepaths:
+                    raise RuntimeError(
+                        "No sourcepath found for class {class_name}".format(
+                            class_name=class_name
+                        )
+                    )
+
+                for sourcepath, _ in sourcepaths:
+                    lineno = 0
+                    message = unexpected.get("message")
+                    # Turn '... at org.mozilla.gecko.permissions.TestPermissions.testMultipleRequestsAreQueuedAndDispatchedSequentially(TestPermissions.java:118)' into 118.  # NOQA: E501
+                    pattern = r"at {class_name}\.{function_name}\(.*:(\d+)\)"
+                    pattern = pattern.format(
+                        class_name=class_name, function_name=function_name
+                    )
+                    match = re.search(pattern, message)
+                    if match:
+                        lineno = int(match.group(1))
+                    else:
+                        msg = "No source line found for {class_name}.{function_name}".format(
+                            class_name=class_name, function_name=function_name
+                        )
+                        raise RuntimeError(msg)
+
+                    err = {
+                        "level": "error",
+                        "rule": unexpected.get("type"),
+                        "message": message,
+                        "path": os.path.join(
+                            topsrcdir, "mobile", "android", sourcepath
+                        ),
+                        "lineno": lineno,
+                    }
+                    yield result.from_config(config, **err)
+
+
+def test(config, **lintargs):
+    topsrcdir = lintargs["root"]
+    topobjdir = lintargs["topobjdir"]
+
+    gradle(
+        lintargs["log"],
+        topsrcdir=topsrcdir,
+        topobjdir=topobjdir,
+        tasks=lintargs["substs"]["GRADLE_ANDROID_TEST_TASKS"],
+        extra_args=lintargs.get("extra_args") or [],
+    )
+
+    results = []
+
+    def capitalize(s):
+        # Can't use str.capitalize because it lower cases trailing letters.
+        return (s[0].upper() + s[1:]) if s else ""
+
+    pairs = [("geckoview", lintargs["substs"]["GRADLE_ANDROID_GECKOVIEW_VARIANT_NAME"])]
+    for project, variant in pairs:
+        report_dir = os.path.join(
+            lintargs["topobjdir"],
+            "gradle/build/mobile/android/{}/test-results/test{}UnitTest".format(
+                project, capitalize(variant)
+            ),
+        )
+    results.extend(
+        _parse_android_test_results(
+            config, topsrcdir=lintargs["root"], report_dir=report_dir
+        )
+    )
+
+    return results
diff --git a/tools/lint/black.yml b/tools/lint/black.yml
new file mode 100644
index 0000000000..4c0f8533cc
--- /dev/null
+++ b/tools/lint/black.yml
@@ -0,0 +1,18 @@
+---
+black:
+    description: Reformat python
+    exclude:
+        - gfx/harfbuzz/src/meson.build
+        - '**/*.mako.py'
+        - python/mozbuild/mozbuild/test/frontend/data/reader-error-syntax/moz.build
+        - testing/mozharness/configs/test/test_malformed.py
+        - testing/web-platform/tests
+    extensions:
+        - build
+        - configure
+        - py
+    support-files:
+        - 'tools/lint/python/**'
+    type: external
+    payload: python.black:lint
+    setup: python.black:setup
diff --git a/tools/lint/clang-format.yml b/tools/lint/clang-format.yml
new file mode 100644
index 0000000000..bcdf9d8591
--- /dev/null
+++ b/tools/lint/clang-format.yml
@@ -0,0 +1,12 @@
+---
+clang-format:
+    description: Reformat C/C++
+    include:
+        - '.'
+    extensions: ['cpp', 'c', 'cc', 'h', 'm', 'mm']
+    support-files:
+        - 'tools/lint/clang-format/**'
+    type: external
+    payload: clang-format:lint
+    code_review_warnings: false
+    setup: clang-format:setup
diff --git a/tools/lint/clang-format/__init__.py b/tools/lint/clang-format/__init__.py
new file mode 100644
index 0000000000..d0a81f7b06
--- /dev/null
+++ b/tools/lint/clang-format/__init__.py
@@ -0,0 +1,237 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import re
+import signal
+import sys
+import xml.etree.ElementTree as ET
+
+from mozboot.util import get_tools_dir
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+from mozprocess import ProcessHandler
+
+CLANG_FORMAT_NOT_FOUND = """
+Could not find clang-format! It should've been installed automatically - \
+please report a bug here:
+https://bugzilla.mozilla.org/enter_bug.cgi?product=Firefox%20Build%20System&component=Lint%20and%20Formatting
+""".strip()
+
+
+def setup(root, mach_command_context, **lintargs):
+    if get_clang_format_binary():
+        return 0
+
+    from mozbuild.code_analysis.mach_commands import get_clang_tools
+
+    rc, _ = get_clang_tools(mach_command_context)
+    if rc:
+        return 1
+
+
+class ClangFormatProcess(ProcessHandler):
+    def __init__(self, config, *args, **kwargs):
+        self.config = config
+        kwargs["stream"] = False
+        kwargs["universal_newlines"] = True
+        ProcessHandler.__init__(self, *args, **kwargs)
+
+    def run(self, *args, **kwargs):
+        orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+        ProcessHandler.run(self, *args, **kwargs)
+        signal.signal(signal.SIGINT, orig)
+
+
+def run_process(config, cmd):
+    proc = ClangFormatProcess(config, cmd)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+    return proc.output
+
+
+def get_clang_format_binary():
+    """
+    Returns the path of the first clang-format binary available
+    if not found returns None
+    """
+    binary = os.environ.get("CLANG_FORMAT")
+    if binary:
+        return binary
+
+    clang_tools_path = os.path.join(get_tools_dir(), "clang-tools")
+    bin_path = os.path.join(clang_tools_path, "clang-tidy", "bin")
+    binary = os.path.join(bin_path, "clang-format")
+
+    if sys.platform.startswith("win"):
+        binary += ".exe"
+
+    if not os.path.isfile(binary):
+        return None
+
+    return binary
+
+
+def is_ignored_path(ignored_dir_re, topsrcdir, f):
+    # Remove up to topsrcdir in pathname and match
+    if f.startswith(topsrcdir + "/"):
+        match_f = f[len(topsrcdir + "/") :]
+    else:
+        match_f = f
+    return re.match(ignored_dir_re, match_f)
+
+
+def remove_ignored_path(paths, topsrcdir, log):
+    path_to_third_party = os.path.join(topsrcdir, ".clang-format-ignore")
+
+    ignored_dir = []
+    with open(path_to_third_party, "r") as fh:
+        for line in fh:
+            # In case it starts with a space
+            line = line.strip()
+            # Remove comments and empty lines
+            if line.startswith("#") or len(line) == 0:
+                continue
+            # The regexp is to make sure we are managing relative paths
+            ignored_dir.append(r"^[\./]*" + line.rstrip())
+
+    # Generates the list of regexp
+    ignored_dir_re = "(%s)" % "|".join(ignored_dir)
+
+    path_list = []
+    for f in paths:
+        if is_ignored_path(ignored_dir_re, topsrcdir, f):
+            # Early exit if we have provided an ignored directory
+            log.debug("Ignored third party code '{0}'".format(f))
+            continue
+        path_list.append(f)
+
+    return path_list
+
+
+def lint(paths, config, fix=None, **lintargs):
+    log = lintargs["log"]
+    paths = list(expand_exclusions(paths, config, lintargs["root"]))
+
+    # We ignored some specific files for a bunch of reasons.
+    # Not using excluding to avoid duplication
+    if lintargs.get("use_filters", True):
+        paths = remove_ignored_path(paths, lintargs["root"], log)
+
+    # An empty path array can occur when the user passes in `-n`. If we don't
+    # return early in this case, rustfmt will attempt to read stdin and hang.
+    if not paths:
+        return []
+
+    binary = get_clang_format_binary()
+
+    if not binary:
+        print(CLANG_FORMAT_NOT_FOUND)
+        if "MOZ_AUTOMATION" in os.environ:
+            return 1
+        return []
+
+    cmd_args = [binary]
+
+    base_command = cmd_args + ["--version"]
+    version = run_process(config, base_command)
+    log.debug("Version: {}".format(version))
+
+    cmd_args.append("--output-replacements-xml")
+    base_command = cmd_args + paths
+    log.debug("Command: {}".format(" ".join(cmd_args)))
+    output = run_process(config, base_command)
+
+    def replacement(parser):
+        for end, e in parser.read_events():
+            assert end == "end"
+            if e.tag == "replacement":
+                item = {k: int(v) for k, v in e.items()}
+                assert sorted(item.keys()) == ["length", "offset"]
+                item["with"] = (e.text or "").encode("utf-8")
+                yield item
+
+    # When given multiple paths as input, --output-replacements-xml
+    # will output one xml per path, in the order they are given, but
+    # XML parsers don't know how to handle that, so do it manually.
+    parser = None
+    replacements = []
+    for line in output:
+        if line.startswith("<?xml "):
+            if parser:
+                replacements.append(list(replacement(parser)))
+            parser = ET.XMLPullParser(["end"])
+        parser.feed(line)
+    replacements.append(list(replacement(parser)))
+
+    results = []
+    fixed = 0
+    for path, replacement in zip(paths, replacements):
+        if not replacement:
+            continue
+        with open(path, "rb") as fh:
+            data = fh.read()
+
+        linenos = []
+        patched_data = b""
+        last_offset = 0
+        lineno_before = 1
+        lineno_after = 1
+
+        for item in replacement:
+            offset = item["offset"]
+            length = item["length"]
+            replace_with = item["with"]
+            since_last_offset = data[last_offset:offset]
+            replaced = data[offset : offset + length]
+
+            lines_since_last_offset = since_last_offset.count(b"\n")
+            lineno_before += lines_since_last_offset
+            lineno_after += lines_since_last_offset
+            start_lineno = (lineno_before, lineno_after)
+
+            lineno_before += replaced.count(b"\n")
+            lineno_after += replace_with.count(b"\n")
+            end_lineno = (lineno_before, lineno_after)
+
+            if linenos and start_lineno[0] <= linenos[-1][1][0]:
+                linenos[-1] = (linenos[-1][0], end_lineno)
+            else:
+                linenos.append((start_lineno, end_lineno))
+
+            patched_data += since_last_offset + replace_with
+            last_offset = offset + len(replaced)
+        patched_data += data[last_offset:]
+
+        lines_before = data.decode("utf-8", "replace").splitlines()
+        lines_after = patched_data.decode("utf-8", "replace").splitlines()
+        for (start_before, start_after), (end_before, end_after) in linenos:
+            diff = "".join(
+                "-" + l + "\n" for l in lines_before[start_before - 1 : end_before]
+            )
+            diff += "".join(
+                "+" + l + "\n" for l in lines_after[start_after - 1 : end_after]
+            )
+
+            results.append(
+                result.from_config(
+                    config,
+                    path=path,
+                    diff=diff,
+                    level="warning",
+                    lineno=start_before,
+                    column=0,
+                )
+            )
+
+        if fix:
+            with open(path, "wb") as fh:
+                fh.write(patched_data)
+            fixed += len(linenos)
+
+    return {"results": results, "fixed": fixed}
diff --git a/tools/lint/clippy.yml b/tools/lint/clippy.yml
new file mode 100644
index 0000000000..f735295d40
--- /dev/null
+++ b/tools/lint/clippy.yml
@@ -0,0 +1,107 @@
+---
+clippy:
+    description: Lint rust
+    include:
+        - build/workspace-hack/
+        - dom/midi/midir_impl/
+        - dom/media/gtest/
+        - dom/webauthn/libudev-sys/
+        - gfx/webrender_bindings/
+        - gfx/wr/peek-poke/
+        - gfx/wr/peek-poke/peek-poke-derive/
+        - gfx/wr/webrender_build/
+        - gfx/wr/wr_malloc_size_of/
+        - js/src/frontend/smoosh/
+        - js/src/rust/shared/
+        - modules/libpref/init/static_prefs/
+        - mozglue/static/rust/
+        - netwerk/base/mozurl/
+        - servo/components/derive_common/
+        - servo/components/selectors/
+        - servo/components/servo_arc/
+        - servo/components/style/
+        - servo/components/style_derive/
+        - servo/components/style_traits/
+        - servo/components/to_shmem/
+        - servo/components/to_shmem_derive/
+        - servo/tests/unit/style/
+        - testing/geckodriver/
+        - testing/mozbase/rust/mozdevice/
+        - testing/mozbase/rust/mozprofile/
+        - testing/mozbase/rust/mozrunner/
+        - testing/mozbase/rust/mozversion/
+        - testing/webdriver/
+        - third_party/rust/mp4parse/
+        - third_party/rust/mp4parse_capi/
+        - toolkit/components/kvstore/
+        - toolkit/components/glean/
+        - toolkit/library/rust/
+        - tools/fuzzing/rust/
+        - tools/profiler/rust-api/
+        - xpcom/rust/gtest/bench-collections/
+        - xpcom/rust/xpcom/xpcom_macros/
+    exclude:
+        # Many are failing for the same reasons:
+        # https://bugzilla.mozilla.org/show_bug.cgi?id=1606073
+        # https://bugzilla.mozilla.org/show_bug.cgi?id=1606077
+        - Cargo.toml
+        # nsstring
+        # derive_hash_xor_eq
+        - gfx/wr/
+        - gfx/wr/webrender/
+        - gfx/wr/examples/
+        # windows-only
+        - gfx/wr/example-compositor/compositor-windows/
+        - gfx/wr/webrender_api/
+        - gfx/wr/wrench/
+        - gfx/wgpu_bindings/
+        # not_unsafe_ptr_arg_deref
+        - modules/libpref/parser/
+        - tools/profiler/rust-helper/
+        - toolkit/library/rust/shared/
+        - toolkit/library/gtest/rust/
+        # not_unsafe_ptr_arg_deref
+        - remote/
+        - dom/media/webrtc/sdp/rsdparsa_capi/
+        - intl/encoding_glue/
+        # not_unsafe_ptr_arg_deref
+        - storage/rust/
+        - storage/variant/
+        # nsstring
+        - servo/ports/geckolib/tests/
+        - xpcom/rust/xpcom/
+        - xpcom/rust/nsstring/
+        - xpcom/rust/gtest/xpcom/
+        - xpcom/rust/gtest/nsstring/
+        - security/manager/ssl/cert_storage/
+        - intl/locale/rust/fluent-langneg-ffi/
+        - intl/locale/rust/unic-langid-ffi/
+        - toolkit/components/places/bookmark_sync/
+        - xpcom/rust/nserror/
+        - xpcom/rust/moz_task/
+        - xpcom/rust/gkrust_utils/
+        - netwerk/socket/neqo_glue/
+        - dom/media/webrtc/transport/mdns_service/
+        - tools/lint/test/files/clippy/
+        - servo/ports/geckolib/
+        - servo/ports/geckolib/tests/
+        - servo/tests/unit/malloc_size_of/
+        - servo/components/malloc_size_of/
+        - dom/media/webrtc/sdp/rsdparsa_capi/
+        - testing/geckodriver/marionette/
+        - toolkit/components/bitsdownload/bits_client/
+        - gfx/wr/example-compositor/compositor/
+        - toolkit/components/bitsdownload/bits_client/bits/
+        # mac and windows only
+        - security/manager/ssl/osclientcerts/
+    extensions:
+        - rs
+    support-files:
+        - 'tools/lint/clippy/**'
+    # the version of cargo-clippy is:
+    # clippy 0.1.65 (2019147 2022-09-19)
+    # we use the date instead to facilitate the check
+    # replacing - by . because Python StrictVersion expects this
+    min_clippy_version: 2022.09.19
+    type: external
+    payload: clippy:lint
diff --git a/tools/lint/clippy/__init__.py b/tools/lint/clippy/__init__.py
new file mode 100644
index 0000000000..d22eea357d
--- /dev/null
+++ b/tools/lint/clippy/__init__.py
@@ -0,0 +1,113 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import bisect
+import json
+import os
+import signal
+import subprocess
+import sys
+
+import six
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+from mozprocess import ProcessHandler
+
+
+def in_sorted_list(l, x):
+    i = bisect.bisect_left(l, x)
+    return l[i] == x
+
+
+def handle_clippy_msg(config, line, log, base_path, files):
+    try:
+        detail = json.loads(six.ensure_text(line))
+        if "message" in detail:
+            p = detail["target"]["src_path"]
+            detail = detail["message"]
+            if "level" in detail:
+                if (
+                    detail["level"] == "error" or detail["level"] == "failure-note"
+                ) and not detail["code"]:
+                    log.debug(
+                        "Error outside of clippy."
+                        "This means that the build failed. Therefore, skipping this"
+                    )
+                    log.debug("File = {} / Detail = {}".format(p, detail))
+                    return
+                # We are in a clippy warning
+                if len(detail["spans"]) == 0:
+                    # For some reason, at the end of the summary, we can
+                    # get the following line
+                    # {'rendered': 'warning: 5 warnings emitted\n\n', 'children':
+                    # [], 'code': None, 'level': 'warning', 'message':
+                    # '5 warnings emitted', 'spans': []}
+                    # if this is the case, skip it
+                    log.debug(
+                        "Skipping the summary line {} for file {}".format(detail, p)
+                    )
+                    return
+
+                l = detail["spans"][0]
+                if not in_sorted_list(files, p):
+                    return
+                p = os.path.join(base_path, l["file_name"])
+                res = {
+                    "path": p,
+                    "level": detail["level"],
+                    "lineno": l["line_start"],
+                    "column": l["column_start"],
+                    "message": detail["message"],
+                    "hint": detail["rendered"],
+                    "rule": detail["code"]["code"],
+                    "lineoffset": l["line_end"] - l["line_start"],
+                }
+                return result.from_config(config, **res)
+
+    except json.decoder.JSONDecodeError:
+        log.debug("Could not parse the output:")
+        log.debug("clippy output: {}".format(line))
+        return
+
+
+class clippyProcess(ProcessHandler):
+    def __init__(self, *args, **kwargs):
+        kwargs["stream"] = False
+        ProcessHandler.__init__(self, *args, **kwargs)
+
+    def run(self, *args, **kwargs):
+        orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+        ProcessHandler.run(self, *args, **kwargs)
+        signal.signal(signal.SIGINT, orig)
+
+
+def lint(paths, config, fix=None, **lintargs):
+    files = list(expand_exclusions(paths, config, lintargs["root"]))
+    files.sort()
+    log = lintargs["log"]
+    results = []
+    mach_path = lintargs["root"] + "/mach"
+    march_cargo_process = subprocess.Popen(
+        [
+            sys.executable,
+            mach_path,
+            "--log-no-times",
+            "cargo",
+            "clippy",
+            "--",
+            "--message-format=json",
+        ],
+        stdout=subprocess.PIPE,
+        text=True,
+    )
+    for l in march_cargo_process.stdout:
+        r = handle_clippy_msg(config, l, log, lintargs["root"], files)
+        if r is not None:
+            results.append(r)
+    march_cargo_process.wait()
+
+    if fix:
+        log.error("Rust linting in mach does not support --fix")
+
+    return results
diff --git a/tools/lint/codespell.yml b/tools/lint/codespell.yml
new file mode 100644
index 0000000000..a76ca12e43
--- /dev/null
+++ b/tools/lint/codespell.yml
@@ -0,0 +1,95 @@
+---
+codespell:
+    description: Check code for common misspellings
+    include:
+        - browser/base/content/docs/
+        - browser/branding/
+        - browser/components/newtab/docs/
+        - browser/components/newtab/content-src/asrouter/docs/
+        - browser/components/places/docs/
+        - browser/components/touchbar/docs/
+        - browser/components/urlbar/docs/
+        - browser/extensions/formautofill/locales/en-US/
+        - browser/extensions/report-site-issue/locales/en-US/
+        - browser/installer/windows/docs/
+        - browser/locales/en-US/
+        - build/docs/
+        - devtools/client/locales/en-US/
+        - devtools/docs/
+        - devtools/shared/locales/en-US/
+        - devtools/startup/locales/en-US/
+        - docs/
+        - dom/docs/
+        - dom/locales/en-US/
+        - gfx/docs/
+        - intl/docs/
+        - intl/locales/en-US/
+        - ipc/docs/
+        - js/src/doc/
+        - layout/tools/layout-debug/ui/content/layoutdebug.ftl
+        - mobile/android/branding/
+        - mobile/android/docs/
+        - mobile/android/locales/en-US/
+        - netwerk/locales/en-US/
+        - netwerk/docs/
+        - python/docs/
+        - python/mach/docs/
+        - python/mozlint/
+        - python/mozperftest/perfdocs/
+        - remote/doc/
+        - security/manager/locales/en-US/
+        - services/settings/docs/
+        - taskcluster/docs/
+        - testing/docs/xpcshell/
+        - testing/geckodriver/doc/
+        - testing/mozbase/docs/
+        - testing/raptor/raptor/perfdocs/
+        - toolkit/components/extensions/docs/
+        - toolkit/components/normandy/docs/
+        - toolkit/components/search/docs/
+        - toolkit/components/telemetry/docs/
+        - toolkit/crashreporter/docs/
+        - toolkit/docs/
+        - toolkit/locales/en-US/
+        - toolkit/modules/docs/
+        - tools/code-coverage/docs/
+        - tools/fuzzing/docs/
+        - tools/lint/
+        - tools/moztreedocs/
+        - tools/profiler/docs/
+        - tools/sanitizer/docs/
+        - tools/tryselect/
+        - uriloader/docs/
+        - xpcom/docs/
+    exclude:
+        - devtools/docs/contributor/tools/storage/
+        - tools/lint/cpp/mingw-headers.txt
+        - tools/lint/test/test_codespell.py
+        - "**/package-lock.json"
+    # List of extensions coming from:
+    # tools/lint/{flake8,eslint}.yml
+    # tools/mach_commands.py (clang-format)
+    # + documentation
+    # + localization files
+    extensions:
+        - js
+        - jsm
+        - jxs
+        - mjs
+        - xml
+        - html
+        - xhtml
+        - cpp
+        - c
+        - h
+        - configure
+        - py
+        - properties
+        - rst
+        - md
+        - ftl
+    support-files:
+        - 'tools/lint/spell/**'
+    type: external
+    setup: spell:setup
+    payload: spell:lint
diff --git a/tools/lint/cpp/__init__.py b/tools/lint/cpp/__init__.py
new file mode 100644
index 0000000000..c580d191c1
--- /dev/null
+++ b/tools/lint/cpp/__init__.py
@@ -0,0 +1,3 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
diff --git a/tools/lint/cpp/mingw-capitalization.py b/tools/lint/cpp/mingw-capitalization.py
new file mode 100644
index 0000000000..b5a4b07c6a
--- /dev/null
+++ b/tools/lint/cpp/mingw-capitalization.py
@@ -0,0 +1,37 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import re
+
+from mozlint.types import LineType
+
+here = os.path.abspath(os.path.dirname(__file__))
+HEADERS_FILE = os.path.join(here, "mingw-headers.txt")
+# generated by cd mingw-w64/mingw-w64-headers &&
+#  find . -name "*.h" | xargs -I bob -- basename bob | sort | uniq)
+
+
+class MinGWCapitalization(LineType):
+    def __init__(self, *args, **kwargs):
+        super(MinGWCapitalization, self).__init__(*args, **kwargs)
+        with open(HEADERS_FILE, "r") as fh:
+            self.headers = fh.read().strip().splitlines()
+        self.regex = re.compile("^#include\s*<(" + "|".join(self.headers) + ")>")
+
+    def condition(self, payload, line, config):
+        if not line.startswith("#include"):
+            return False
+
+        if self.regex.search(line, re.I):
+            return not self.regex.search(line)
+
+
+def lint(paths, config, **lintargs):
+    results = []
+
+    m = MinGWCapitalization()
+    for path in paths:
+        results.extend(m._lint(path, config, **lintargs))
+    return results
diff --git a/tools/lint/cpp/mingw-headers.txt b/tools/lint/cpp/mingw-headers.txt
new file mode 100644
index 0000000000..5ee737c393
--- /dev/null
+++ b/tools/lint/cpp/mingw-headers.txt
@@ -0,0 +1,1452 @@
+accctrl.h
+aclapi.h
+aclui.h
+acpiioct.h
+activation.h
+activaut.h
+activdbg100.h
+activdbg.h
+activecf.h
+activeds.h
+activprof.h
+activscp.h
+adc.h
+adhoc.h
+admex.h
+adoctint.h
+adodef.h
+adogpool_backcompat.h
+adogpool.h
+adoguids.h
+adoid.h
+adoint_backcompat.h
+adoint.h
+adojet.h
+adomd.h
+adptif.h
+adsdb.h
+adserr.h
+adshlp.h
+adsiid.h
+adsnms.h
+adsprop.h
+adssts.h
+adtgen.h
+advpub.h
+afilter.h
+af_irda.h
+afxres.h
+agtctl.h
+agterr.h
+agtsvr.h
+alg.h
+alink.h
+amaudio.h
+amstream.h
+amtvuids.h
+amvideo.h
+apdevpkey.h
+apisetcconv.h
+apiset.h
+appmgmt.h
+aqadmtyp.h
+asptlb.h
+assert.h
+atacct.h
+atalkwsh.h
+atm.h
+atsmedia.h
+audevcod.h
+audioapotypes.h
+audioclient.h
+audioendpoints.h
+audioengineendpoint.h
+audiopolicy.h
+audiosessiontypes.h
+austream.h
+authif.h
+authz.h
+aux_ulib.h
+avifmt.h
+aviriff.h
+avrfsdk.h
+avrt.h
+axextendenums.h
+azroles.h
+basetsd.h
+basetyps.h
+batclass.h
+bcrypt.h
+bdaiface_enums.h
+bdaiface.h
+bdamedia.h
+bdasup.h
+bdatypes.h
+bemapiset.h
+bh.h
+bidispl.h
+bits1_5.h
+bits2_0.h
+bitscfg.h
+bits.h
+bitsmsg.h
+blberr.h
+bluetoothapis.h
+_bsd_types.h
+bthdef.h
+bthsdpdef.h
+bugcodes.h
+callobj.h
+cardmod.h
+casetup.h
+cchannel.h
+cdefs.h
+cderr.h
+cdoexerr.h
+cdoex.h
+cdoexm.h
+cdoexstr.h
+cdonts.h
+cdosyserr.h
+cdosys.h
+cdosysstr.h
+celib.h
+certadm.h
+certbase.h
+certbcli.h
+certcli.h
+certenc.h
+certenroll.h
+certexit.h
+certif.h
+certmod.h
+certpol.h
+certreqd.h
+certsrv.h
+certview.h
+cfg.h
+cfgmgr32.h
+cguid.h
+chanmgr.h
+cierror.h
+classpnp.h
+clfs.h
+clfsmgmt.h
+clfsmgmtw32.h
+clfsw32.h
+client.h
+cluadmex.h
+clusapi.h
+cluscfgguids.h
+cluscfgserver.h
+cluscfgwizard.h
+cmdtree.h
+cmnquery.h
+codecapi.h
+colordlg.h
+comadmin.h
+combaseapi.h
+comcat.h
+comdef.h
+comdefsp.h
+comip.h
+comlite.h
+commapi.h
+commctrl.h
+commdlg.h
+commoncontrols.h
+complex.h
+compobj.h
+compressapi.h
+compstui.h
+comsvcs.h
+comutil.h
+confpriv.h
+conio.h
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+_timeval.h
+timezoneapi.h
+tlbref.h
+tlhelp32.h
+tlogstg.h
+tmschema.h
+tnef.h
+tom.h
+tpcshrd.h
+traffic.h
+transact.h
+triedcid.h
+triediid.h
+triedit.h
+tsattrs.h
+tspi.h
+tssbx.h
+tsuserex.h
+tuner.h
+tvout.h
+txcoord.h
+txctx.h
+txdtc.h
+txfw32.h
+typeinfo.h
+types.h
+uastrfnc.h
+uchar.h
+udpmib.h
+uianimation.h
+uiautomationclient.h
+uiautomationcoreapi.h
+uiautomationcore.h
+uiautomation.h
+uiviewsettingsinterop.h
+umx.h
+unistd.h
+unknown.h
+unknwnbase.h
+unknwn.h
+upssvc.h
+urlhist.h
+urlmon.h
+usb100.h
+usb200.h
+usbbusif.h
+usbcamdi.h
+usbdi.h
+usbdlib.h
+usbdrivr.h
+usb.h
+usbioctl.h
+usbiodef.h
+usbkern.h
+usbprint.h
+usbprotocoldefs.h
+usbrpmif.h
+usbscan.h
+usbspec.h
+usbstorioctl.h
+usbuser.h
+userenv.h
+usp10.h
+utilapiset.h
+utime.h
+uuids.h
+uxtheme.h
+vadefs.h
+varargs.h
+_varenum.h
+vcr.h
+vdmdbg.h
+vds.h
+vdslun.h
+versionhelpers.h
+vfw.h
+vfwmsgs.h
+videoagp.h
+video.h
+virtdisk.h
+vmr9.h
+vsadmin.h
+vsbackup.h
+vsmgmt.h
+vsprov.h
+vss.h
+vsstyle.h
+vssym32.h
+vswriter.h
+w32api.h
+wabapi.h
+wabcode.h
+wabdefs.h
+wab.h
+wabiab.h
+wabmem.h
+wabnot.h
+wabtags.h
+wabutil.h
+wbemads.h
+wbemcli.h
+wbemdisp.h
+wbemidl.h
+wbemprov.h
+wbemtran.h
+wchar.h
+wchar_s.h
+wcmconfig.h
+wcsplugin.h
+wct.h
+wctype.h
+wdmguid.h
+wdm.h
+wdsbp.h
+wdsclientapi.h
+wdspxe.h
+wdstci.h
+wdstpdi.h
+wdstptmgmt.h
+werapi.h
+wfext.h
+wglext.h
+wiadef.h
+wiadevd.h
+wia.h
+wiavideo.h
+winable.h
+winapifamily.h
+winbase.h
+winber.h
+wincodec.h
+wincon.h
+wincred.h
+wincrypt.h
+winddi.h
+winddiui.h
+windef.h
+windns.h
+windot11.h
+windows.foundation.h
+windows.h
+windows.security.cryptography.h
+windows.storage.h
+windows.storage.streams.h
+windows.system.threading.h
+windowsx.h
+winefs.h
+winerror.h
+winevt.h
+wingdi.h
+winhttp.h
+wininet.h
+winineti.h
+winioctl.h
+winldap.h
+winnetwk.h
+winnls32.h
+winnls.h
+winnt.h
+winperf.h
+winreg.h
+winresrc.h
+winsafer.h
+winsatcominterfacei.h
+winscard.h
+winsdkver.h
+winsmcrd.h
+winsnmp.h
+winsock2.h
+winsock.h
+winsplp.h
+winspool.h
+winstring.h
+winsvc.h
+winsxs.h
+winsync.h
+winternl.h
+wintrust.h
+winusb.h
+winusbio.h
+winuser.h
+winver.h
+winwlx.h
+wlanapi.h
+wlanihvtypes.h
+wlantypes.h
+wmcodecdsp.h
+wmcontainer.h
+wmdrmsdk.h
+wmiatlprov.h
+wmidata.h
+wmilib.h
+wmistr.h
+wmiutils.h
+wmsbuffer.h
+wmsdkidl.h
+wnnc.h
+wow64apiset.h
+wownt16.h
+wownt32.h
+wpapi.h
+wpapimsg.h
+wpcapi.h
+wpcevent.h
+wpcrsmsg.h
+wpftpmsg.h
+wppstmsg.h
+wpspihlp.h
+wptypes.h
+wpwizmsg.h
+wrl.h
+_ws1_undef.h
+ws2atm.h
+ws2bth.h
+ws2def.h
+ws2dnet.h
+ws2ipdef.h
+ws2san.h
+ws2spi.h
+ws2tcpip.h
+_wsadata.h
+_wsa_errnos.h
+wsdapi.h
+wsdattachment.h
+wsdbase.h
+wsdclient.h
+wsddisco.h
+wsdhost.h
+wsdtypes.h
+wsdutil.h
+wsdxmldom.h
+wsdxml.h
+wshisotp.h
+wsipv6ok.h
+wsipx.h
+wsmandisp.h
+wsman.h
+wsnetbs.h
+wsnwlink.h
+wspiapi.h
+wsrm.h
+wsvns.h
+wtsapi32.h
+wtypesbase.h
+wtypes.h
+xa.h
+xcmcext.h
+xcmc.h
+xcmcmsx2.h
+xcmcmsxt.h
+xenroll.h
+xfilter.h
+xinput.h
+xlocinfo.h
+xmath.h
+_xmitfile.h
+xmldomdid.h
+xmldsodid.h
+xmllite.h
+xmltrnsf.h
+xolehlp.h
+xpsdigitalsignature.h
+xpsobjectmodel_1.h
+xpsobjectmodel.h
+xpsprint.h
+xpsrassvc.h
+ymath.h
+yvals.h
+zmouse.h
diff --git a/tools/lint/eslint.yml b/tools/lint/eslint.yml
new file mode 100644
index 0000000000..6946ef672a
--- /dev/null
+++ b/tools/lint/eslint.yml
@@ -0,0 +1,32 @@
+---
+eslint:
+    description: JavaScript linter
+    # ESLint infra handles its own path filtering, so just include cwd
+    include: ['.']
+    exclude: []
+    # When adding to this list, consider updating hooks_js_format.py as well.
+    extensions: ['mjs', 'js', 'jsm', 'json', 'jsx', 'html', 'sjs', 'xhtml']
+    support-files:
+        - '**/.eslintrc.js'
+        - '.eslintrc-test-paths.js'
+        - '.eslintignore'
+        - 'tools/lint/eslint/**'
+        # Files that can influence global variables
+        - 'browser/base/content/nsContextMenu.js'
+        - 'browser/base/content/utilityOverlay.js'
+        - 'browser/components/customizableui/content/panelUI.js'
+        - 'browser/components/downloads/content/downloads.js'
+        - 'browser/components/downloads/content/indicator.js'
+        - 'testing/mochitest/tests/SimpleTest/EventUtils.js'
+        - 'testing/mochitest/tests/SimpleTest/MockObjects.js'
+        - 'testing/mochitest/tests/SimpleTest/SimpleTest.js'
+        - 'testing/mochitest/tests/SimpleTest/WindowSnapshot.js'
+        - 'toolkit/components/printing/content/printUtils.js'
+        - 'toolkit/components/viewsource/content/viewSourceUtils.js'
+        - 'toolkit/content/contentAreaUtils.js'
+        - 'toolkit/content/editMenuOverlay.js'
+        - 'toolkit/content/globalOverlay.js'
+        - 'toolkit/modules/Services.jsm'
+    type: external
+    payload: eslint:lint
+    setup: eslint:setup
diff --git a/tools/lint/eslint/.eslintrc.js b/tools/lint/eslint/.eslintrc.js
new file mode 100644
index 0000000000..4a245d9de2
--- /dev/null
+++ b/tools/lint/eslint/.eslintrc.js
@@ -0,0 +1,30 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+module.exports = {
+  plugins: ["eslint-plugin"],
+  extends: ["plugin:eslint-plugin/recommended"],
+  // eslint-plugin-mozilla runs under node, so we need a more restrictive
+  // environment / parser setup here than the rest of mozilla-central.
+  env: {
+    browser: false,
+    node: true,
+  },
+  parser: "espree",
+  parserOptions: {
+    ecmaVersion: 12,
+  },
+
+  rules: {
+    camelcase: ["error", { properties: "never" }],
+    "handle-callback-err": ["error", "er"],
+    "no-shadow": "error",
+    "no-undef-init": "error",
+    "one-var": ["error", "never"],
+    strict: ["error", "global"],
+    "eslint-plugin/prefer-message-ids": "off",
+  },
+};
diff --git a/tools/lint/eslint/__init__.py b/tools/lint/eslint/__init__.py
new file mode 100644
index 0000000000..0bd320d691
--- /dev/null
+++ b/tools/lint/eslint/__init__.py
@@ -0,0 +1,280 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import os
+import signal
+import subprocess
+import sys
+
+sys.path.append(os.path.join(os.path.dirname(__file__), "eslint"))
+from mozbuild.nodeutil import find_node_executable
+from mozlint import result
+
+from eslint import setup_helper
+
+ESLINT_ERROR_MESSAGE = """
+An error occurred running eslint. Please check the following error messages:
+
+{}
+""".strip()
+
+ESLINT_NOT_FOUND_MESSAGE = """
+Could not find eslint!  We looked at the --binary option, at the ESLINT
+environment variable, and then at your local node_modules path. Please Install
+eslint and needed plugins with:
+
+mach eslint --setup
+
+and try again.
+""".strip()
+
+PRETTIER_ERROR_MESSAGE = """
+An error occurred running prettier. Please check the following error messages:
+
+{}
+""".strip()
+
+PRETTIER_FORMATTING_MESSAGE = (
+    "This file needs formatting with Prettier (use 'mach lint --fix <path>')."
+)
+
+
+def setup(root, **lintargs):
+    setup_helper.set_project_root(root)
+
+    if not setup_helper.check_node_executables_valid():
+        return 1
+
+    return setup_helper.eslint_maybe_setup()
+
+
+def lint(paths, config, binary=None, fix=None, rules=[], setup=None, **lintargs):
+    """Run eslint."""
+    log = lintargs["log"]
+    setup_helper.set_project_root(lintargs["root"])
+    module_path = setup_helper.get_project_root()
+
+    # Valid binaries are:
+    #  - Any provided by the binary argument.
+    #  - Any pointed at by the ESLINT environmental variable.
+    #  - Those provided by |mach lint --setup|.
+
+    if not binary:
+        binary, _ = find_node_executable()
+
+    if not binary:
+        print(ESLINT_NOT_FOUND_MESSAGE)
+        return 1
+
+    extra_args = lintargs.get("extra_args") or []
+    exclude_args = []
+    for path in config.get("exclude", []):
+        exclude_args.extend(
+            ["--ignore-pattern", os.path.relpath(path, lintargs["root"])]
+        )
+
+    for rule in rules:
+        extra_args.extend(["--rule", rule])
+
+    # First run ESLint
+    cmd_args = (
+        [
+            binary,
+            os.path.join(module_path, "node_modules", "eslint", "bin", "eslint.js"),
+            # This keeps ext as a single argument.
+            "--ext",
+            "[{}]".format(",".join(config["extensions"])),
+            "--format",
+            "json",
+            "--no-error-on-unmatched-pattern",
+        ]
+        + rules
+        + extra_args
+        + exclude_args
+        + paths
+    )
+
+    if fix:
+        # eslint requires that --fix be set before the --ext argument.
+        cmd_args.insert(2, "--fix")
+
+    log.debug("ESLint command: {}".format(" ".join(cmd_args)))
+
+    result = run(cmd_args, config)
+    if result == 1:
+        return result
+
+    # Then run Prettier
+    cmd_args = (
+        [
+            binary,
+            os.path.join(module_path, "node_modules", "prettier", "bin-prettier.js"),
+            "--list-different",
+            "--no-error-on-unmatched-pattern",
+        ]
+        + extra_args
+        # Prettier does not support exclude arguments.
+        # + exclude_args
+        + paths
+    )
+    log.debug("Prettier command: {}".format(" ".join(cmd_args)))
+
+    if fix:
+        cmd_args.append("--write")
+
+    prettier_result = run_prettier(cmd_args, config, fix)
+    if prettier_result == 1:
+        return prettier_result
+
+    result["results"].extend(prettier_result["results"])
+    result["fixed"] = result["fixed"] + prettier_result["fixed"]
+    return result
+
+
+def run(cmd_args, config):
+
+    shell = False
+    if (
+        os.environ.get("MSYSTEM") in ("MINGW32", "MINGW64")
+        or "MOZILLABUILD" in os.environ
+    ):
+        # The eslint binary needs to be run from a shell with msys
+        shell = True
+    encoding = "utf-8"
+
+    orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+    proc = subprocess.Popen(
+        cmd_args, shell=shell, stdout=subprocess.PIPE, stderr=subprocess.PIPE
+    )
+    signal.signal(signal.SIGINT, orig)
+
+    try:
+        output, errors = proc.communicate()
+    except KeyboardInterrupt:
+        proc.kill()
+        return {"results": [], "fixed": 0}
+
+    if errors:
+        errors = errors.decode(encoding, "replace")
+        print(ESLINT_ERROR_MESSAGE.format(errors))
+
+    if proc.returncode >= 2:
+        return 1
+
+    if not output:
+        return {"results": [], "fixed": 0}  # no output means success
+    output = output.decode(encoding, "replace")
+    try:
+        jsonresult = json.loads(output)
+    except ValueError:
+        print(ESLINT_ERROR_MESSAGE.format(output))
+        return 1
+
+    results = []
+    fixed = 0
+    for obj in jsonresult:
+        errors = obj["messages"]
+        # This will return a count of files fixed, rather than issues fixed, as
+        # that is the only count we have.
+        if "output" in obj:
+            fixed = fixed + 1
+
+        for err in errors:
+            err.update(
+                {
+                    "hint": err.get("fix"),
+                    "level": "error" if err["severity"] == 2 else "warning",
+                    "lineno": err.get("line") or 0,
+                    "path": obj["filePath"],
+                    "rule": err.get("ruleId"),
+                }
+            )
+            results.append(result.from_config(config, **err))
+
+    return {"results": results, "fixed": fixed}
+
+
+def run_prettier(cmd_args, config, fix):
+    shell = False
+    if is_windows():
+        # The eslint binary needs to be run from a shell with msys
+        shell = True
+    encoding = "utf-8"
+
+    orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+    proc = subprocess.Popen(
+        cmd_args, shell=shell, stdout=subprocess.PIPE, stderr=subprocess.PIPE
+    )
+    signal.signal(signal.SIGINT, orig)
+
+    try:
+        output, errors = proc.communicate()
+    except KeyboardInterrupt:
+        proc.kill()
+        return {"results": [], "fixed": 0}
+
+    if errors:
+        errors = errors.decode(encoding, "replace").strip().split("\n")
+        errors = [
+            error
+            for error in errors
+            # Unknown options are not an issue for Prettier, this avoids
+            # errors during tests.
+            if not ("Ignored unknown option" in error)
+        ]
+        if len(errors):
+            print(PRETTIER_ERROR_MESSAGE.format("\n".join(errors)))
+
+    if not output:
+        # If we have errors, but no output, we assume something really bad happened.
+        if errors and len(errors):
+            return 1
+
+        return {"results": [], "fixed": 0}  # no output means success
+
+    output = output.decode(encoding, "replace").splitlines()
+
+    results = []
+    fixed = 0
+
+    if fix:
+        # When Prettier is running in fix mode, it outputs the list of files
+        # that have been fixed, so sum them up here.
+        # If it can't fix files, it will throw an error, which will be handled
+        # above.
+        fixed = len(output)
+    else:
+        # When in "check" mode, Prettier will output the list of files that
+        # need changing, so we'll wrap them in our result structure here.
+        for file in output:
+            if not file:
+                continue
+
+            file = os.path.abspath(file)
+            results.append(
+                result.from_config(
+                    config,
+                    **{
+                        "name": "eslint",
+                        "path": file,
+                        "message": PRETTIER_FORMATTING_MESSAGE,
+                        "level": "error",
+                        "rule": "prettier",
+                        "lineno": 0,
+                        "column": 0,
+                    }
+                )
+            )
+
+    return {"results": results, "fixed": fixed}
+
+
+def is_windows():
+    return (
+        os.environ.get("MSYSTEM") in ("MINGW32", "MINGW64")
+        or "MOZILLABUILD" in os.environ
+    )
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/.npmignore b/tools/lint/eslint/eslint-plugin-mozilla/.npmignore
new file mode 100644
index 0000000000..3713448c7a
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/.npmignore
@@ -0,0 +1,8 @@
+.eslintrc.js
+.npmignore
+node_modules
+reporters
+scripts
+tests
+package-lock.json
+update.sh
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/LICENSE b/tools/lint/eslint/eslint-plugin-mozilla/LICENSE
new file mode 100644
index 0000000000..e87a115e46
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/LICENSE
@@ -0,0 +1,363 @@
+Mozilla Public License, version 2.0
+
+1. Definitions
+
+1.1. "Contributor"
+
+     means each individual or legal entity that creates, contributes to the
+     creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+
+     means the combination of the Contributions of others (if any) used by a
+     Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+
+     means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+
+     means Source Code Form to which the initial Contributor has attached the
+     notice in Exhibit A, the Executable Form of such Source Code Form, and
+     Modifications of such Source Code Form, in each case including portions
+     thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+     means
+
+     a. that the initial Contributor has attached the notice described in
+        Exhibit B to the Covered Software; or
+
+     b. that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the terms of
+        a Secondary License.
+
+1.6. "Executable Form"
+
+     means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+
+     means a work that combines Covered Software with other material, in a
+     separate file or files, that is not Covered Software.
+
+1.8. "License"
+
+     means this document.
+
+1.9. "Licensable"
+
+     means having the right to grant, to the maximum extent possible, whether
+     at the time of the initial grant or subsequently, any and all of the
+     rights conveyed by this License.
+
+1.10. "Modifications"
+
+     means any of the following:
+
+     a. any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered Software; or
+
+     b. any new file in Source Code Form that contains any Covered Software.
+
+1.11. "Patent Claims" of a Contributor
+
+      means any patent claim(s), including without limitation, method,
+      process, and apparatus claims, in any patent Licensable by such
+      Contributor that would be infringed, but for the grant of the License,
+      by the making, using, selling, offering for sale, having made, import,
+      or transfer of either its Contributions or its Contributor Version.
+
+1.12. "Secondary License"
+
+      means either the GNU General Public License, Version 2.0, the GNU Lesser
+      General Public License, Version 2.1, the GNU Affero General Public
+      License, Version 3.0, or any later versions of those licenses.
+
+1.13. "Source Code Form"
+
+      means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+
+      means an individual or a legal entity exercising rights under this
+      License. For legal entities, "You" includes any entity that controls, is
+      controlled by, or is under common control with You. For purposes of this
+      definition, "control" means (a) the power, direct or indirect, to cause
+      the direction or management of such entity, whether by contract or
+      otherwise, or (b) ownership of more than fifty percent (50%) of the
+      outstanding shares or beneficial ownership of such entity.
+
+
+2. License Grants and Conditions
+
+2.1. Grants
+
+     Each Contributor hereby grants You a world-wide, royalty-free,
+     non-exclusive license:
+
+     a. under intellectual property rights (other than patent or trademark)
+        Licensable by such Contributor to use, reproduce, make available,
+        modify, display, perform, distribute, and otherwise exploit its
+        Contributions, either on an unmodified basis, with Modifications, or
+        as part of a Larger Work; and
+
+     b. under Patent Claims of such Contributor to make, use, sell, offer for
+        sale, have made, import, and otherwise transfer either its
+        Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+     The licenses granted in Section 2.1 with respect to any Contribution
+     become effective for each Contribution on the date the Contributor first
+     distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+     The licenses granted in this Section 2 are the only rights granted under
+     this License. No additional rights or licenses will be implied from the
+     distribution or licensing of Covered Software under this License.
+     Notwithstanding Section 2.1(b) above, no patent license is granted by a
+     Contributor:
+
+     a. for any code that a Contributor has removed from Covered Software; or
+
+     b. for infringements caused by: (i) Your and any other third party's
+        modifications of Covered Software, or (ii) the combination of its
+        Contributions with other software (except as part of its Contributor
+        Version); or
+
+     c. under Patent Claims infringed by Covered Software in the absence of
+        its Contributions.
+
+     This License does not grant any rights in the trademarks, service marks,
+     or logos of any Contributor (except as may be necessary to comply with
+     the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+     No Contributor makes additional grants as a result of Your choice to
+     distribute the Covered Software under a subsequent version of this
+     License (see Section 10.2) or under the terms of a Secondary License (if
+     permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+     Each Contributor represents that the Contributor believes its
+     Contributions are its original creation(s) or it has sufficient rights to
+     grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+     This License is not intended to limit any rights You have under
+     applicable copyright doctrines of fair use, fair dealing, or other
+     equivalents.
+
+2.7. Conditions
+
+     Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
+     Section 2.1.
+
+
+3. Responsibilities
+
+3.1. Distribution of Source Form
+
+     All distribution of Covered Software in Source Code Form, including any
+     Modifications that You create or to which You contribute, must be under
+     the terms of this License. You must inform recipients that the Source
+     Code Form of the Covered Software is governed by the terms of this
+     License, and how they can obtain a copy of this License. You may not
+     attempt to alter or restrict the recipients' rights in the Source Code
+     Form.
+
+3.2. Distribution of Executable Form
+
+     If You distribute Covered Software in Executable Form then:
+
+     a. such Covered Software must also be made available in Source Code Form,
+        as described in Section 3.1, and You must inform recipients of the
+        Executable Form how they can obtain a copy of such Source Code Form by
+        reasonable means in a timely manner, at a charge no more than the cost
+        of distribution to the recipient; and
+
+     b. You may distribute such Executable Form under the terms of this
+        License, or sublicense it under different terms, provided that the
+        license for the Executable Form does not attempt to limit or alter the
+        recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+     You may create and distribute a Larger Work under terms of Your choice,
+     provided that You also comply with the requirements of this License for
+     the Covered Software. If the Larger Work is a combination of Covered
+     Software with a work governed by one or more Secondary Licenses, and the
+     Covered Software is not Incompatible With Secondary Licenses, this
+     License permits You to additionally distribute such Covered Software
+     under the terms of such Secondary License(s), so that the recipient of
+     the Larger Work may, at their option, further distribute the Covered
+     Software under the terms of either this License or such Secondary
+     License(s).
+
+3.4. Notices
+
+     You may not remove or alter the substance of any license notices
+     (including copyright notices, patent notices, disclaimers of warranty, or
+     limitations of liability) contained within the Source Code Form of the
+     Covered Software, except that You may alter any license notices to the
+     extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+     You may choose to offer, and to charge a fee for, warranty, support,
+     indemnity or liability obligations to one or more recipients of Covered
+     Software. However, You may do so only on Your own behalf, and not on
+     behalf of any Contributor. You must make it absolutely clear that any
+     such warranty, support, indemnity, or liability obligation is offered by
+     You alone, and You hereby agree to indemnify every Contributor for any
+     liability incurred by such Contributor as a result of warranty, support,
+     indemnity or liability terms You offer. You may include additional
+     disclaimers of warranty and limitations of liability specific to any
+     jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+
+   If it is impossible for You to comply with any of the terms of this License
+   with respect to some or all of the Covered Software due to statute,
+   judicial order, or regulation then You must: (a) comply with the terms of
+   this License to the maximum extent possible; and (b) describe the
+   limitations and the code they affect. Such description must be placed in a
+   text file included with all distributions of the Covered Software under
+   this License. Except to the extent prohibited by statute or regulation,
+   such description must be sufficiently detailed for a recipient of ordinary
+   skill to be able to understand it.
+
+5. Termination
+
+5.1. The rights granted under this License will terminate automatically if You
+     fail to comply with any of its terms. However, if You become compliant,
+     then the rights granted under this License from a particular Contributor
+     are reinstated (a) provisionally, unless and until such Contributor
+     explicitly and finally terminates Your grants, and (b) on an ongoing
+     basis, if such Contributor fails to notify You of the non-compliance by
+     some reasonable means prior to 60 days after You have come back into
+     compliance. Moreover, Your grants from a particular Contributor are
+     reinstated on an ongoing basis if such Contributor notifies You of the
+     non-compliance by some reasonable means, this is the first time You have
+     received notice of non-compliance with this License from such
+     Contributor, and You become compliant prior to 30 days after Your receipt
+     of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+     infringement claim (excluding declaratory judgment actions,
+     counter-claims, and cross-claims) alleging that a Contributor Version
+     directly or indirectly infringes any patent, then the rights granted to
+     You by any and all Contributors for the Covered Software under Section
+     2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
+     license agreements (excluding distributors and resellers) which have been
+     validly granted by You or Your distributors under this License prior to
+     termination shall survive termination.
+
+6. Disclaimer of Warranty
+
+   Covered Software is provided under this License on an "as is" basis,
+   without warranty of any kind, either expressed, implied, or statutory,
+   including, without limitation, warranties that the Covered Software is free
+   of defects, merchantable, fit for a particular purpose or non-infringing.
+   The entire risk as to the quality and performance of the Covered Software
+   is with You. Should any Covered Software prove defective in any respect,
+   You (not any Contributor) assume the cost of any necessary servicing,
+   repair, or correction. This disclaimer of warranty constitutes an essential
+   part of this License. No use of  any Covered Software is authorized under
+   this License except under this disclaimer.
+
+7. Limitation of Liability
+
+   Under no circumstances and under no legal theory, whether tort (including
+   negligence), contract, or otherwise, shall any Contributor, or anyone who
+   distributes Covered Software as permitted above, be liable to You for any
+   direct, indirect, special, incidental, or consequential damages of any
+   character including, without limitation, damages for lost profits, loss of
+   goodwill, work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses, even if such party shall have been
+   informed of the possibility of such damages. This limitation of liability
+   shall not apply to liability for death or personal injury resulting from
+   such party's negligence to the extent applicable law prohibits such
+   limitation. Some jurisdictions do not allow the exclusion or limitation of
+   incidental or consequential damages, so this exclusion and limitation may
+   not apply to You.
+
+8. Litigation
+
+   Any litigation relating to this License may be brought only in the courts
+   of a jurisdiction where the defendant maintains its principal place of
+   business and such litigation shall be governed by laws of that
+   jurisdiction, without reference to its conflict-of-law provisions. Nothing
+   in this Section shall prevent a party's ability to bring cross-claims or
+   counter-claims.
+
+9. Miscellaneous
+
+   This License represents the complete agreement concerning the subject
+   matter hereof. If any provision of this License is held to be
+   unenforceable, such provision shall be reformed only to the extent
+   necessary to make it enforceable. Any law or regulation which provides that
+   the language of a contract shall be construed against the drafter shall not
+   be used to construe this License against a Contributor.
+
+
+10. Versions of the License
+
+10.1. New Versions
+
+      Mozilla Foundation is the license steward. Except as provided in Section
+      10.3, no one other than the license steward has the right to modify or
+      publish new versions of this License. Each version will be given a
+      distinguishing version number.
+
+10.2. Effect of New Versions
+
+      You may distribute the Covered Software under the terms of the version
+      of the License under which You originally received the Covered Software,
+      or under the terms of any subsequent version published by the license
+      steward.
+
+10.3. Modified Versions
+
+      If you create software not governed by this License, and you want to
+      create a new license for such software, you may create and use a
+      modified version of this License if you rename the license and remove
+      any references to the name of the license steward (except to note that
+      such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+      Licenses If You choose to distribute Source Code Form that is
+      Incompatible With Secondary Licenses under the terms of this version of
+      the License, the notice described in Exhibit B of this License must be
+      attached.
+
+Exhibit A - Source Code Form License Notice
+
+      This Source Code Form is subject to the
+      terms of the Mozilla Public License, v.
+      2.0. If a copy of the MPL was not
+      distributed with this file, You can
+      obtain one at
+      http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular file,
+then You may include the notice in a location (such as a LICENSE file in a
+relevant directory) where a recipient would be likely to look for such a
+notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+
+      This Source Code Form is "Incompatible
+      With Secondary Licenses", as defined by
+      the Mozilla Public License, v. 2.0.
+
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/README.md b/tools/lint/eslint/eslint-plugin-mozilla/README.md
new file mode 100644
index 0000000000..650507754e
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/README.md
@@ -0,0 +1,56 @@
+# eslint-plugin-mozilla
+
+A collection of rules that help enforce JavaScript coding standard in the Mozilla project.
+
+These are primarily developed and used within the Firefox build system ([mozilla-central](https://hg.mozilla.org/mozilla-central/)), but are made available for other
+related projects to use as well.
+
+## Installation
+
+### Within mozilla-central:
+
+```
+$ ./mach eslint --setup
+```
+
+### Outside mozilla-central:
+
+Install ESLint [ESLint](http://eslint.org):
+
+```
+$ npm i eslint --save-dev
+```
+
+Next, install `eslint-plugin-mozilla`:
+
+```
+$ npm install eslint-plugin-mozilla --save-dev
+```
+
+## Documentation
+
+For details about the rules, please see the [firefox documentation page](http://firefox-source-docs.mozilla.org/tools/lint/linters/eslint-plugin-mozilla.html).
+
+## Source Code
+
+The sources can be found at:
+
+* Code: https://searchfox.org/mozilla-central/source/tools/lint/eslint/eslint-plugin-mozilla
+* Documentation: https://searchfox.org/mozilla-central/source/docs/code-quality/lint/linters
+
+## Bugs
+
+Please file bugs in Bugzilla in the Lint component of the Testing product.
+
+* [Existing bugs](https://bugzilla.mozilla.org/buglist.cgi?resolution=---&query_format=advanced&component=Lint&product=Testing)
+* [New bugs](https://bugzilla.mozilla.org/enter_bug.cgi?product=Testing&component=Lint)
+
+## Tests
+
+The tests can only be run from within mozilla-central. To run the tests:
+
+```
+./mach eslint --setup
+cd tools/lint/eslint/eslint-plugin-mozilla
+npm run test
+```
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/.eslintrc.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/.eslintrc.js
new file mode 100644
index 0000000000..76df4134f5
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/.eslintrc.js
@@ -0,0 +1,8 @@
+"use strict";
+
+module.exports = {
+  rules: {
+    // Require object keys to be sorted.
+    "sort-keys": "error",
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/browser-test.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/browser-test.js
new file mode 100644
index 0000000000..28b51f9ed3
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/browser-test.js
@@ -0,0 +1,91 @@
+// Parent config file for all browser-chrome files.
+"use strict";
+
+module.exports = {
+  env: {
+    browser: true,
+    "mozilla/browser-window": true,
+    "mozilla/simpletest": true,
+    // "node": true
+  },
+
+  // All globals made available in the test environment.
+  globals: {
+    // `$` is defined in SimpleTest.js
+    $: false,
+    Assert: false,
+    BrowserTestUtils: false,
+    ContentTask: false,
+    ContentTaskUtils: false,
+    EventUtils: false,
+    IOUtils: false,
+    PathUtils: false,
+    PromiseDebugging: false,
+    SpecialPowers: false,
+    TestUtils: false,
+    addLoadEvent: false,
+    add_setup: false,
+    add_task: false,
+    content: false,
+    executeSoon: false,
+    expectUncaughtException: false,
+    export_assertions: false,
+    extractJarToTmp: false,
+    finish: false,
+    gTestPath: false,
+    getChromeDir: false,
+    getJar: false,
+    getResolvedURI: false,
+    getRootDirectory: false,
+    getTestFilePath: false,
+    ignoreAllUncaughtExceptions: false,
+    info: false,
+    is: false,
+    isnot: false,
+    ok: false,
+    record: false,
+    registerCleanupFunction: false,
+    requestLongerTimeout: false,
+    setExpectedFailuresForSelfTest: false,
+    stringContains: false,
+    stringMatches: false,
+    todo: false,
+    todo_is: false,
+    todo_isnot: false,
+    waitForClipboard: false,
+    waitForExplicitFinish: false,
+    waitForFocus: false,
+  },
+
+  plugins: ["mozilla", "@microsoft/sdl"],
+
+  rules: {
+    // No using of insecure url, so no http urls
+    "@microsoft/sdl/no-insecure-url": [
+      "error",
+      {
+        exceptions: [
+          "^http:\\/\\/mochi\\.test?.*",
+          "^http:\\/\\/localhost?.*",
+          "^http:\\/\\/127\\.0\\.0\\.1?.*",
+          // Exempt xmlns urls
+          "^http:\\/\\/www\\.w3\\.org?.*",
+          "^http:\\/\\/www\\.mozilla\\.org\\/keymaster\\/gatekeeper?.*",
+          // Exempt urls that start with ftp or ws.
+          "^ws:?.*",
+          "^ftp:?.*",
+        ],
+        varExceptions: ["insecure?.*"],
+      },
+    ],
+    "mozilla/import-content-task-globals": "error",
+    "mozilla/import-headjs-globals": "error",
+    "mozilla/mark-test-function-used": "error",
+    "mozilla/no-addtask-setup": "error",
+    "mozilla/no-arbitrary-setTimeout": "error",
+    "mozilla/no-redeclare-with-import-autofix": [
+      "error",
+      { errorForNonImports: false },
+    ],
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/chrome-test.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/chrome-test.js
new file mode 100644
index 0000000000..fa1e8d6190
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/chrome-test.js
@@ -0,0 +1,61 @@
+// Parent config file for all mochitest files.
+"use strict";
+
+module.exports = {
+  env: {
+    browser: true,
+    "mozilla/browser-window": true,
+  },
+
+  // All globals made available in the test environment.
+  globals: {
+    // SpecialPowers is injected into the window object via SimpleTest.js
+    SpecialPowers: false,
+    extractJarToTmp: false,
+    getChromeDir: false,
+    getJar: false,
+    getResolvedURI: false,
+    getRootDirectory: false,
+  },
+
+  overrides: [
+    {
+      env: {
+        // Ideally we wouldn't be using the simpletest env here, but our uses of
+        // js files mean we pick up everything from the global scope, which could
+        // be any one of a number of html files. So we just allow the basics...
+        "mozilla/simpletest": true,
+      },
+      files: ["*.js"],
+    },
+  ],
+
+  plugins: ["mozilla", "@microsoft/sdl"],
+
+  rules: {
+    // No using of insecure url, so no http urls
+    "@microsoft/sdl/no-insecure-url": [
+      "error",
+      {
+        exceptions: [
+          "^http:\\/\\/mochi\\.test?.*",
+          "^http:\\/\\/localhost?.*",
+          "^http:\\/\\/127\\.0\\.0\\.1?.*",
+          // Exempt xmlns urls
+          "^http:\\/\\/www\\.w3\\.org?.*",
+          "^http:\\/\\/www\\.mozilla\\.org\\/keymaster\\/gatekeeper?.*",
+          // Exempt urls that start with ftp or ws.
+          "^ws:?.*",
+          "^ftp:?.*",
+        ],
+        varExceptions: ["insecure?.*"],
+      },
+    ],
+    "mozilla/import-content-task-globals": "error",
+    "mozilla/import-headjs-globals": "error",
+    "mozilla/mark-test-function-used": "error",
+    // We mis-predict globals for HTML test files in directories shared
+    // with browser tests.
+    "mozilla/no-redeclare-with-import-autofix": "off",
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/mochitest-test.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/mochitest-test.js
new file mode 100644
index 0000000000..3f72193d4d
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/mochitest-test.js
@@ -0,0 +1,59 @@
+// Parent config file for all mochitest files.
+"use strict";
+
+module.exports = {
+  env: {
+    browser: true,
+  },
+
+  // All globals made available in the test environment.
+  globals: {
+    // SpecialPowers is injected into the window object via SimpleTest.js
+    SpecialPowers: false,
+  },
+
+  overrides: [
+    {
+      env: {
+        // Ideally we wouldn't be using the simpletest env here, but our uses of
+        // js files mean we pick up everything from the global scope, which could
+        // be any one of a number of html files. So we just allow the basics...
+        "mozilla/simpletest": true,
+      },
+      files: ["*.js"],
+    },
+  ],
+  plugins: ["mozilla", "@microsoft/sdl"],
+
+  rules: {
+    // No using of insecure url, so no http urls
+    "@microsoft/sdl/no-insecure-url": [
+      "error",
+      {
+        exceptions: [
+          "^http:\\/\\/mochi\\.test?.*",
+          "^http:\\/\\/mochi\\.xorigin-test?.*",
+          "^http:\\/\\/localhost?.*",
+          "^http:\\/\\/127\\.0\\.0\\.1?.*",
+          // Exempt xmlns urls
+          "^http:\\/\\/www\\.w3\\.org?.*",
+          "^http:\\/\\/www\\.mozilla\\.org\\/keymaster\\/gatekeeper?.*",
+          // Exempt urls that start with ftp or ws.
+          "^ws:?.*",
+          "^ftp:?.*",
+        ],
+        varExceptions: ["insecure?.*"],
+      },
+    ],
+    "mozilla/import-content-task-globals": "error",
+    "mozilla/import-headjs-globals": "error",
+    "mozilla/mark-test-function-used": "error",
+    // Turn off no-define-cc-etc for mochitests as these don't have Cc etc defined in the
+    // global scope.
+    "mozilla/no-define-cc-etc": "off",
+    // We mis-predict globals for HTML test files in directories shared
+    // with browser tests, so don't try to "fix" imports that are needed.
+    "mozilla/no-redeclare-with-import-autofix": "off",
+    "no-shadow": "error",
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js
new file mode 100644
index 0000000000..a7d8c067f0
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js
@@ -0,0 +1,356 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/**
+ * The configuration is based on eslint:recommended config. The details for all
+ * the ESLint rules, and which ones are in the recommended configuration can
+ * be found here:
+ *
+ * https://eslint.org/docs/rules/
+ */
+module.exports = {
+  env: {
+    browser: true,
+    es2021: true,
+    "mozilla/privileged": true,
+    "mozilla/specific": true,
+  },
+
+  // The prettier configuration here comes from eslint-config-prettier and
+  // turns off all of ESLint's rules related to formatting.
+  extends: ["eslint:recommended", "prettier"],
+
+  overrides: [
+    {
+      // System mjs files and jsm files are not loaded in the browser scope,
+      // so we turn that off for those. Though we do have our own special
+      // environment for them.
+      env: {
+        browser: false,
+        "mozilla/jsm": true,
+      },
+      files: ["**/*.sys.mjs", "**/*.jsm", "**/*.jsm.js"],
+      rules: {
+        "mozilla/lazy-getter-object-name": "error",
+        "mozilla/reject-eager-module-in-lazy-getter": "error",
+        "mozilla/reject-global-this": "error",
+        "mozilla/reject-globalThis-modification": "error",
+        // For all system modules, we expect no properties to need importing,
+        // hence reject everything.
+        "mozilla/reject-importGlobalProperties": ["error", "everything"],
+        "mozilla/reject-mixing-eager-and-lazy": "error",
+        "mozilla/reject-top-level-await": "error",
+        // TODO: Bug 1575506 turn `builtinGlobals` on here.
+        // We can enable builtinGlobals for jsms due to their scopes.
+        "no-redeclare": ["error", { builtinGlobals: false }],
+      },
+    },
+    {
+      files: ["**/*.mjs", "**/*.jsm"],
+      rules: {
+        // Modules are far easier to check for no-unused-vars on a global scope,
+        // than our content files. Hence we turn that on here.
+        "no-unused-vars": [
+          "error",
+          {
+            args: "none",
+            vars: "all",
+          },
+        ],
+      },
+    },
+    {
+      files: ["**/*.sys.mjs"],
+      rules: {
+        "mozilla/use-static-import": "error",
+      },
+    },
+    {
+      excludedFiles: ["**/*.sys.mjs"],
+      files: ["**/*.mjs"],
+      rules: {
+        "mozilla/reject-import-system-module-from-non-system": "error",
+        "mozilla/reject-lazy-imports-into-globals": "error",
+        "no-shadow": ["error", { allow: ["event"], builtinGlobals: true }],
+      },
+    },
+    {
+      files: ["**/*.mjs"],
+      rules: {
+        "mozilla/use-static-import": "error",
+        // This rule defaults to not allowing "use strict" in module files since
+        // they are always loaded in strict mode.
+        strict: "error",
+      },
+    },
+    {
+      files: ["**/*.jsm", "**/*.jsm.js"],
+      rules: {
+        "mozilla/mark-exported-symbols-as-used": "error",
+      },
+    },
+    {
+      env: {
+        browser: false,
+        "mozilla/privileged": false,
+        "mozilla/sjs": true,
+      },
+      files: ["**/*.sjs"],
+      rules: {
+        // TODO Bug 1501127: sjs files have their own sandbox, and do not inherit
+        // the Window backstage pass directly. Turn this rule off for sjs files for
+        // now until we develop a solution.
+        "mozilla/reject-importGlobalProperties": "off",
+      },
+    },
+  ],
+
+  parserOptions: {
+    ecmaVersion: 12,
+  },
+
+  // When adding items to this file please check for effects on sub-directories.
+  plugins: ["html", "fetch-options", "no-unsanitized"],
+
+  // When adding items to this file please check for effects on all of toolkit
+  // and browser
+  rules: {
+    // This may conflict with prettier, so we turn it off.
+    "arrow-body-style": "off",
+
+    // Warn about cyclomatic complexity in functions.
+    // XXX Get this down to 20?
+    complexity: ["error", 34],
+
+    // Functions must always return something or nothing
+    "consistent-return": "error",
+
+    // XXX This rule line should be removed to enable it. See bug 1487642.
+    // Require super() calls in constructors
+    "constructor-super": "off",
+
+    // Require braces around blocks that start a new line
+    curly: ["error", "all"],
+
+    // Encourage the use of dot notation whenever possible.
+    "dot-notation": "error",
+
+    // XXX This rule should be enabled, see Bug 1557040
+    // No credentials submitted with fetch calls
+    "fetch-options/no-fetch-credentials": "off",
+
+    // XXX This rule line should be removed to enable it. See bug 1487642.
+    // Enforce return statements in getters
+    "getter-return": "off",
+
+    // Don't enforce the maximum depth that blocks can be nested. The complexity
+    // rule is a better rule to check this.
+    "max-depth": "off",
+
+    // Maximum depth callbacks can be nested.
+    "max-nested-callbacks": ["error", 10],
+
+    "mozilla/avoid-removeChild": "error",
+    "mozilla/consistent-if-bracing": "error",
+    "mozilla/import-browser-window-globals": "error",
+    "mozilla/import-globals": "error",
+    "mozilla/no-compare-against-boolean-literals": "error",
+    "mozilla/no-cu-reportError": "error",
+    "mozilla/no-define-cc-etc": "error",
+    "mozilla/no-throw-cr-literal": "error",
+    "mozilla/no-useless-parameters": "error",
+    "mozilla/no-useless-removeEventListener": "error",
+    "mozilla/prefer-boolean-length-check": "error",
+    "mozilla/prefer-formatValues": "error",
+    "mozilla/reject-addtask-only": "error",
+    "mozilla/reject-chromeutils-import-params": "error",
+    "mozilla/reject-importGlobalProperties": ["error", "allownonwebidl"],
+    "mozilla/reject-multiple-getters-calls": "error",
+    "mozilla/reject-scriptableunicodeconverter": "warn",
+    "mozilla/rejects-requires-await": "error",
+    "mozilla/use-cc-etc": "error",
+    "mozilla/use-chromeutils-generateqi": "error",
+    "mozilla/use-chromeutils-import": "error",
+    "mozilla/use-default-preference-values": "error",
+    "mozilla/use-includes-instead-of-indexOf": "error",
+    "mozilla/use-isInstance": "error",
+    "mozilla/use-ownerGlobal": "error",
+    "mozilla/use-returnValue": "error",
+    "mozilla/use-services": "error",
+    "mozilla/valid-lazy": "error",
+    "mozilla/valid-services": "error",
+
+    // Use [] instead of Array()
+    "no-array-constructor": "error",
+
+    // Disallow use of arguments.caller or arguments.callee.
+    "no-caller": "error",
+
+    // XXX Bug 1487642 - decide if we want to enable this or not.
+    // Disallow lexical declarations in case clauses
+    "no-case-declarations": "off",
+
+    // XXX Bug 1487642 - decide if we want to enable this or not.
+    // Disallow the use of console
+    "no-console": "off",
+
+    // Disallows expressions where the operation doesn't affect the value.
+    "no-constant-binary-expression": "error",
+
+    // XXX Bug 1487642 - decide if we want to enable this or not.
+    // Disallow constant expressions in conditions
+    "no-constant-condition": "off",
+
+    // No duplicate keys in object declarations
+    "no-dupe-keys": "error",
+
+    // If an if block ends with a return no need for an else block
+    "no-else-return": "error",
+
+    // No empty statements
+    "no-empty": ["error", { allowEmptyCatch: true }],
+
+    // Disallow eval and setInteral/setTimeout with strings
+    "no-eval": "error",
+
+    // Disallow unnecessary calls to .bind()
+    "no-extra-bind": "error",
+
+    // Disallow fallthrough of case statements
+    "no-fallthrough": [
+      "error",
+      {
+        // The eslint rule doesn't allow for case-insensitive regex option.
+        // The following pattern allows for a dash between "fall through" as
+        // well as alternate spelling of "fall thru". The pattern also allows
+        // for an optional "s" at the end of "fall" ("falls through").
+        commentPattern:
+          "[Ff][Aa][Ll][Ll][Ss]?[\\s-]?([Tt][Hh][Rr][Oo][Uu][Gg][Hh]|[Tt][Hh][Rr][Uu])",
+      },
+    ],
+
+    // Disallow assignments to native objects or read-only global variables
+    "no-global-assign": "error",
+
+    // Disallow eval and setInteral/setTimeout with strings
+    "no-implied-eval": "error",
+
+    // This has been superseded since we're using ES6.
+    // Disallow variable or function declarations in nested blocks
+    "no-inner-declarations": "off",
+
+    // Disallow the use of the __iterator__ property
+    "no-iterator": "error",
+
+    // No labels
+    "no-labels": "error",
+
+    // Disallow unnecessary nested blocks
+    "no-lone-blocks": "error",
+
+    // No single if block inside an else block
+    "no-lonely-if": "error",
+
+    // Disallow the use of number literals that immediately lose precision at runtime when converted to JS Number
+    "no-loss-of-precision": "error",
+
+    // Nested ternary statements are confusing
+    "no-nested-ternary": "error",
+
+    // Use {} instead of new Object()
+    "no-new-object": "error",
+
+    // Disallow use of new wrappers
+    "no-new-wrappers": "error",
+
+    // We don't want this, see bug 1551829
+    "no-prototype-builtins": "off",
+
+    // Disable builtinGlobals for no-redeclare as this conflicts with our
+    // globals declarations especially for browser window.
+    "no-redeclare": ["error", { builtinGlobals: false }],
+
+    // Disallow use of event global.
+    "no-restricted-globals": ["error", "event"],
+
+    // Disallows unnecessary `return await ...`.
+    "no-return-await": "error",
+
+    // No unnecessary comparisons
+    "no-self-compare": "error",
+
+    // No comma sequenced statements
+    "no-sequences": "error",
+
+    // No declaring variables from an outer scope
+    // "no-shadow": "error",
+
+    // No declaring variables that hide things like arguments
+    "no-shadow-restricted-names": "error",
+
+    // Disallow throwing literals (eg. throw "error" instead of
+    // throw new Error("error")).
+    "no-throw-literal": "error",
+
+    // Disallow the use of Boolean literals in conditional expressions.
+    "no-unneeded-ternary": "error",
+
+    // No unsanitized use of innerHTML=, document.write() etc.
+    // cf. https://github.com/mozilla/eslint-plugin-no-unsanitized#rule-details
+    "no-unsanitized/method": "error",
+    "no-unsanitized/property": "error",
+
+    // No declaring variables that are never used
+    "no-unused-vars": [
+      "error",
+      {
+        args: "none",
+        vars: "local",
+      },
+    ],
+
+    // No using variables before defined
+    // "no-use-before-define": ["error", "nofunc"],
+
+    // Disallow unnecessary .call() and .apply()
+    "no-useless-call": "error",
+
+    // Don't concatenate string literals together (unless they span multiple
+    // lines)
+    "no-useless-concat": "error",
+
+    // XXX Bug 1487642 - decide if we want to enable this or not.
+    // Disallow unnecessary escape characters
+    "no-useless-escape": "off",
+
+    // Disallow redundant return statements
+    "no-useless-return": "error",
+
+    // No using with
+    "no-with": "error",
+
+    // Require object-literal shorthand with ES6 method syntax
+    "object-shorthand": ["error", "always", { avoidQuotes: true }],
+
+    // This may conflict with prettier, so turn it off.
+    "prefer-arrow-callback": "off",
+
+    // This generates too many false positives that are not easy to work around,
+    // and false positives seem to be inherent in the rule.
+    "require-atomic-updates": "off",
+
+    // XXX Bug 1487642 - decide if we want to enable this or not.
+    // Require generator functions to contain yield
+    "require-yield": "off",
+  },
+
+  // To avoid bad interactions of the html plugin with the xml preprocessor in
+  // eslint-plugin-mozilla, we turn off processing of the html plugin for .xml
+  // files.
+  settings: {
+    "html/xml-extensions": [".xhtml"],
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/require-jsdoc.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/require-jsdoc.js
new file mode 100644
index 0000000000..0a037ab159
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/require-jsdoc.js
@@ -0,0 +1,32 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+module.exports = {
+  plugins: ["jsdoc"],
+
+  rules: {
+    "jsdoc/require-jsdoc": [
+      "error",
+      {
+        require: {
+          ClassDeclaration: true,
+          FunctionDeclaration: false,
+        },
+      },
+    ],
+    "jsdoc/require-param": "error",
+    "jsdoc/require-param-description": "error",
+    "jsdoc/require-param-name": "error",
+    "jsdoc/require-property": "error",
+    "jsdoc/require-property-description": "error",
+    "jsdoc/require-property-name": "error",
+    "jsdoc/require-property-type": "error",
+    "jsdoc/require-returns": "error",
+    "jsdoc/require-returns-check": "error",
+    "jsdoc/require-yields": "error",
+    "jsdoc/require-yields-check": "error",
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/valid-jsdoc.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/valid-jsdoc.js
new file mode 100644
index 0000000000..485dddfbd4
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/valid-jsdoc.js
@@ -0,0 +1,25 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+module.exports = {
+  plugins: ["jsdoc"],
+
+  rules: {
+    "jsdoc/check-access": "error",
+    // Handled by prettier
+    // "jsdoc/check-alignment": "error",
+    "jsdoc/check-param-names": "error",
+    "jsdoc/check-property-names": "error",
+    "jsdoc/check-tag-names": "error",
+    "jsdoc/check-types": "error",
+    "jsdoc/empty-tags": "error",
+    "jsdoc/newline-after-description": "error",
+    "jsdoc/no-multi-asterisks": "error",
+    "jsdoc/require-param-type": "error",
+    "jsdoc/require-returns-type": "error",
+    "jsdoc/valid-types": "error",
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/xpcshell-test.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/xpcshell-test.js
new file mode 100644
index 0000000000..492ecc1ae9
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/xpcshell-test.js
@@ -0,0 +1,50 @@
+// Parent config file for all xpcshell files.
+"use strict";
+
+module.exports = {
+  env: {
+    browser: false,
+    "mozilla/privileged": true,
+    "mozilla/xpcshell": true,
+  },
+
+  overrides: [
+    {
+      // If it is a head file, we turn off global unused variable checks, as it
+      // would require searching the other test files to know if they are used or not.
+      // This would be expensive and slow, and it isn't worth it for head files.
+      // We could get developers to declare as exported, but that doesn't seem worth it.
+      files: "head*.js",
+      rules: {
+        "no-unused-vars": [
+          "error",
+          {
+            args: "none",
+            vars: "local",
+          },
+        ],
+      },
+    },
+    {
+      // No declaring variables that are never used
+      files: "test*.js",
+      rules: {
+        "no-unused-vars": [
+          "error",
+          {
+            args: "none",
+            vars: "all",
+          },
+        ],
+      },
+    },
+  ],
+
+  rules: {
+    "mozilla/import-headjs-globals": "error",
+    "mozilla/mark-test-function-used": "error",
+    "mozilla/no-arbitrary-setTimeout": "error",
+    "mozilla/no-useless-run-test": "error",
+    "no-shadow": "error",
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/browser-window.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/browser-window.js
new file mode 100644
index 0000000000..01f7d512b6
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/browser-window.js
@@ -0,0 +1,119 @@
+/**
+ * @fileoverview Defines the environment when in the browser.xhtml window.
+ *               Imports many globals from various files.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+var fs = require("fs");
+var helpers = require("../helpers");
+var { getScriptGlobals } = require("./utils");
+
+// When updating EXTRA_SCRIPTS or MAPPINGS, be sure to also update the
+// 'support-files' config in `tools/lint/eslint.yml`.
+
+// These are scripts not loaded from browser.xhtml or global-scripts.inc
+// but via other includes.
+const EXTRA_SCRIPTS = [
+  "browser/base/content/nsContextMenu.js",
+  "browser/components/downloads/content/downloads.js",
+  "browser/components/downloads/content/indicator.js",
+  "toolkit/content/customElements.js",
+  "toolkit/content/editMenuOverlay.js",
+];
+
+const extraDefinitions = [
+  // Via Components.utils, defineModuleGetter, defineLazyModuleGetters or
+  // defineLazyScriptGetter (and map to
+  // single) variable.
+  { name: "XPCOMUtils", writable: false },
+  { name: "Task", writable: false },
+  { name: "windowGlobalChild", writable: false },
+  // structuredClone is a new global that would be defined for the `browser`
+  // environment in ESLint, but only Firefox has implemented it currently and so
+  // it isn't in ESLint's globals yet.
+  // https://developer.mozilla.org/docs/Web/API/structuredClone
+  { name: "structuredClone", writable: false },
+];
+
+// Some files in global-scripts.inc need mapping to specific locations.
+const MAPPINGS = {
+  "printUtils.js": "toolkit/components/printing/content/printUtils.js",
+  "panelUI.js": "browser/components/customizableui/content/panelUI.js",
+  "viewSourceUtils.js":
+    "toolkit/components/viewsource/content/viewSourceUtils.js",
+  "browserPlacesViews.js":
+    "browser/components/places/content/browserPlacesViews.js",
+  "places-tree.js": "browser/components/places/content/places-tree.js",
+  "places-menupopup.js":
+    "browser/components/places/content/places-menupopup.js",
+};
+
+const globalScriptsRegExp =
+  /^\s*Services.scriptloader.loadSubScript\(\"(.*?)\", this\);$/;
+
+function getGlobalScriptIncludes(scriptPath) {
+  let fileData;
+  try {
+    fileData = fs.readFileSync(scriptPath, { encoding: "utf8" });
+  } catch (ex) {
+    // The file isn't present, so this isn't an m-c repository.
+    return null;
+  }
+
+  fileData = fileData.split("\n");
+
+  let result = [];
+
+  for (let line of fileData) {
+    let match = line.match(globalScriptsRegExp);
+    if (match) {
+      let sourceFile = match[1]
+        .replace(
+          "chrome://browser/content/search/",
+          "browser/components/search/content/"
+        )
+        .replace(
+          "chrome://browser/content/screenshots/",
+          "browser/components/screenshots/content/"
+        )
+        .replace("chrome://browser/content/", "browser/base/content/")
+        .replace("chrome://global/content/", "toolkit/content/");
+
+      for (let mapping of Object.getOwnPropertyNames(MAPPINGS)) {
+        if (sourceFile.includes(mapping)) {
+          sourceFile = MAPPINGS[mapping];
+        }
+      }
+
+      result.push(sourceFile);
+    }
+  }
+
+  return result;
+}
+
+function getGlobalScripts() {
+  let results = [];
+  for (let scriptPath of helpers.globalScriptPaths) {
+    results = results.concat(getGlobalScriptIncludes(scriptPath));
+  }
+  return results;
+}
+
+module.exports = getScriptGlobals(
+  "browser-window",
+  getGlobalScripts().concat(EXTRA_SCRIPTS),
+  extraDefinitions,
+  {
+    browserjsScripts: getGlobalScripts().concat(EXTRA_SCRIPTS),
+  }
+);
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/chrome-script.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/chrome-script.js
new file mode 100644
index 0000000000..9b0ae54a2e
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/chrome-script.js
@@ -0,0 +1,28 @@
+/**
+ * @fileoverview Defines the environment for SpecialPowers chrome script.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var { globals } = require("./special-powers-sandbox");
+var util = require("util");
+
+module.exports = {
+  globals: util._extend(
+    {
+      // testing/specialpowers/content/SpecialPowersParent.sys.mjs
+
+      // SPLoadChromeScript block
+      createWindowlessBrowser: false,
+      sendAsyncMessage: false,
+      addMessageListener: false,
+      removeMessageListener: false,
+      actorParent: false,
+    },
+    globals
+  ),
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/chrome-worker.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/chrome-worker.js
new file mode 100644
index 0000000000..db5759b26c
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/chrome-worker.js
@@ -0,0 +1,25 @@
+/**
+ * @fileoverview Defines the environment for chrome workers. This differs
+ *               from normal workers by the fact that `ctypes` can be accessed
+ *               as well.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var globals = require("globals");
+var util = require("util");
+
+var workerGlobals = util._extend(
+  {
+    ctypes: false,
+  },
+  globals.worker
+);
+
+module.exports = {
+  globals: workerGlobals,
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/frame-script.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/frame-script.js
new file mode 100644
index 0000000000..7ac5c941cf
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/frame-script.js
@@ -0,0 +1,39 @@
+/**
+ * @fileoverview Defines the environment for frame scripts.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  globals: {
+    // dom/chrome-webidl/MessageManager.webidl
+
+    // MessageManagerGlobal
+    dump: false,
+    atob: false,
+    btoa: false,
+
+    // MessageListenerManagerMixin
+    addMessageListener: false,
+    removeMessageListener: false,
+    addWeakMessageListener: false,
+    removeWeakMessageListener: false,
+
+    // MessageSenderMixin
+    sendAsyncMessage: false,
+    processMessageManager: false,
+    remoteType: false,
+
+    // SyncMessageSenderMixin
+    sendSyncMessage: false,
+
+    // ContentFrameMessageManager
+    content: false,
+    docShell: false,
+    tabEventTarget: false,
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/jsm.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/jsm.js
new file mode 100644
index 0000000000..1ff73c04d9
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/jsm.js
@@ -0,0 +1,31 @@
+/**
+ * @fileoverview Defines the environment for jsm files.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  globals: {
+    // These globals are hard-coded and available in .jsm scopes.
+    // https://searchfox.org/mozilla-central/rev/dcb0cfb66e4ed3b9c7fbef1e80572426ff5f3c3a/js/xpconnect/loader/mozJSModuleLoader.cpp#222-223
+    // Although `debug` is allowed for jsm files, this is non-standard and something
+    // we don't want to allow in mjs files. Hence it is not included here.
+    atob: false,
+    btoa: false,
+    dump: false,
+    // The WebAssembly global is available in most (if not all) contexts where
+    // JS can run. It's definitely available in JSMs. So even if this is not
+    // the perfect place to add it, it's not wrong, and we can move it later.
+    WebAssembly: false,
+    // These are hard-coded and available in .jsm scopes.
+    // See BackstagePass::Resolve.
+    fetch: false,
+    crypto: false,
+    indexedDB: false,
+    structuredClone: false,
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/privileged.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/privileged.js
new file mode 100644
index 0000000000..13e81f7cef
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/privileged.js
@@ -0,0 +1,803 @@
+/**
+ * @fileoverview Defines the environment for privileges JS files.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  globals: {
+    // Intl and WebAssembly are available everywhere but are not webIDL definitions.
+    Intl: false,
+    WebAssembly: false,
+    // This list of items is currently obtained manually from the list of
+    // mozilla::dom::constructor::id::ID enumerations in an object directory
+    // generated dom/bindings/RegisterBindings.cpp
+    APZHitResultFlags: false,
+    AbortController: false,
+    AbortSignal: false,
+    AccessibleNode: false,
+    Addon: false,
+    AddonEvent: false,
+    AddonInstall: false,
+    AddonManager: true,
+    AddonManagerPermissions: false,
+    AnalyserNode: false,
+    Animation: false,
+    AnimationEffect: false,
+    AnimationEvent: false,
+    AnimationPlaybackEvent: false,
+    AnimationTimeline: false,
+    AnonymousContent: false,
+    Attr: false,
+    AudioBuffer: false,
+    AudioBufferSourceNode: false,
+    AudioContext: false,
+    AudioDestinationNode: false,
+    AudioListener: false,
+    AudioNode: false,
+    AudioParam: false,
+    AudioParamMap: false,
+    AudioProcessingEvent: false,
+    AudioScheduledSourceNode: false,
+    AudioTrack: false,
+    AudioTrackList: false,
+    AudioWorklet: false,
+    AudioWorkletNode: false,
+    AuthenticatorAssertionResponse: false,
+    AuthenticatorAttestationResponse: false,
+    AuthenticatorResponse: false,
+    BarProp: false,
+    BaseAudioContext: false,
+    BatteryManager: false,
+    BeforeUnloadEvent: false,
+    BiquadFilterNode: false,
+    Blob: false,
+    BlobEvent: false,
+    BoxObject: false,
+    BroadcastChannel: false,
+    BrowsingContext: false,
+    ByteLengthQueuingStrategy: false,
+    CanonicalBrowsingContext: false,
+    CDATASection: false,
+    CSS: false,
+    CSS2Properties: false,
+    CSSAnimation: false,
+    CSSConditionRule: false,
+    CSSCounterStyleRule: false,
+    CSSFontFaceRule: false,
+    CSSFontFeatureValuesRule: false,
+    CSSGroupingRule: false,
+    CSSImportRule: false,
+    CSSKeyframeRule: false,
+    CSSKeyframesRule: false,
+    CSSMediaRule: false,
+    CSSMozDocumentRule: false,
+    CSSNamespaceRule: false,
+    CSSPageRule: false,
+    CSSPseudoElement: false,
+    CSSRule: false,
+    CSSRuleList: false,
+    CSSStyleDeclaration: false,
+    CSSStyleRule: false,
+    CSSStyleSheet: false,
+    CSSSupportsRule: false,
+    CSSTransition: false,
+    Cache: false,
+    CacheStorage: false,
+    CanvasCaptureMediaStream: false,
+    CanvasGradient: false,
+    CanvasPattern: false,
+    CanvasRenderingContext2D: false,
+    CaretPosition: false,
+    CaretStateChangedEvent: false,
+    ChannelMergerNode: false,
+    ChannelSplitterNode: false,
+    ChannelWrapper: false,
+    CharacterData: false,
+    CheckerboardReportService: false,
+    ChildProcessMessageManager: false,
+    ChildSHistory: false,
+    ChromeMessageBroadcaster: false,
+    ChromeMessageSender: false,
+    ChromeNodeList: false,
+    ChromeUtils: false,
+    ChromeWorker: false,
+    Clipboard: false,
+    ClipboardEvent: false,
+    ClonedErrorHolder: false,
+    CloseEvent: false,
+    CommandEvent: false,
+    Comment: false,
+    CompositionEvent: false,
+    ConsoleInstance: false,
+    ConstantSourceNode: false,
+    ContentFrameMessageManager: false,
+    ContentProcessMessageManager: false,
+    ConvolverNode: false,
+    CountQueuingStrategy: false,
+    CreateOfferRequest: false,
+    Credential: false,
+    CredentialsContainer: false,
+    Crypto: false,
+    CryptoKey: false,
+    CustomElementRegistry: false,
+    CustomEvent: false,
+    DOMError: false,
+    DOMException: false,
+    DOMImplementation: false,
+    DOMLocalization: false,
+    DOMMatrix: false,
+    DOMMatrixReadOnly: false,
+    DOMParser: false,
+    DOMPoint: false,
+    DOMPointReadOnly: false,
+    DOMQuad: false,
+    DOMRect: false,
+    DOMRectList: false,
+    DOMRectReadOnly: false,
+    DOMRequest: false,
+    DOMStringList: false,
+    DOMStringMap: false,
+    DOMTokenList: false,
+    DataTransfer: false,
+    DataTransferItem: false,
+    DataTransferItemList: false,
+    DebuggerNotificationObserver: false,
+    DelayNode: false,
+    DeprecationReportBody: false,
+    DeviceLightEvent: false,
+    DeviceMotionEvent: false,
+    DeviceOrientationEvent: false,
+    DeviceProximityEvent: false,
+    Directory: false,
+    Document: false,
+    DocumentFragment: false,
+    DocumentTimeline: false,
+    DocumentType: false,
+    DominatorTree: false,
+    DragEvent: false,
+    DynamicsCompressorNode: false,
+    Element: false,
+    ErrorEvent: false,
+    Event: false,
+    EventSource: false,
+    EventTarget: false,
+    FeaturePolicyViolationReportBody: false,
+    FetchObserver: false,
+    File: false,
+    FileList: false,
+    FileReader: false,
+    FileSystem: false,
+    FileSystemDirectoryEntry: false,
+    FileSystemDirectoryReader: false,
+    FileSystemEntry: false,
+    FileSystemFileEntry: false,
+    Flex: false,
+    FlexItemValues: false,
+    FlexLineValues: false,
+    FluentBundle: false,
+    FluentResource: false,
+    FocusEvent: false,
+    FontFace: false,
+    FontFaceSet: false,
+    FontFaceSetLoadEvent: false,
+    FormData: false,
+    FrameCrashedEvent: false,
+    FrameLoader: false,
+    GainNode: false,
+    Gamepad: false,
+    GamepadAxisMoveEvent: false,
+    GamepadButton: false,
+    GamepadButtonEvent: false,
+    GamepadEvent: false,
+    GamepadHapticActuator: false,
+    GamepadPose: false,
+    GamepadServiceTest: false,
+    Glean: false,
+    GleanPings: false,
+    Grid: false,
+    GridArea: false,
+    GridDimension: false,
+    GridLine: false,
+    GridLines: false,
+    GridTrack: false,
+    GridTracks: false,
+    HTMLAllCollection: false,
+    HTMLAnchorElement: false,
+    HTMLAreaElement: false,
+    HTMLAudioElement: false,
+    Audio: false,
+    HTMLBRElement: false,
+    HTMLBaseElement: false,
+    HTMLBodyElement: false,
+    HTMLButtonElement: false,
+    HTMLCanvasElement: false,
+    HTMLCollection: false,
+    HTMLDListElement: false,
+    HTMLDataElement: false,
+    HTMLDataListElement: false,
+    HTMLDetailsElement: false,
+    HTMLDialogElement: false,
+    HTMLDirectoryElement: false,
+    HTMLDivElement: false,
+    HTMLDocument: false,
+    HTMLElement: false,
+    HTMLEmbedElement: false,
+    HTMLFieldSetElement: false,
+    HTMLFontElement: false,
+    HTMLFormControlsCollection: false,
+    HTMLFormElement: false,
+    HTMLFrameElement: false,
+    HTMLFrameSetElement: false,
+    HTMLHRElement: false,
+    HTMLHeadElement: false,
+    HTMLHeadingElement: false,
+    HTMLHtmlElement: false,
+    HTMLIFrameElement: false,
+    HTMLImageElement: false,
+    Image: false,
+    HTMLInputElement: false,
+    HTMLLIElement: false,
+    HTMLLabelElement: false,
+    HTMLLegendElement: false,
+    HTMLLinkElement: false,
+    HTMLMapElement: false,
+    HTMLMarqueeElement: false,
+    HTMLMediaElement: false,
+    HTMLMenuElement: false,
+    HTMLMenuItemElement: false,
+    HTMLMetaElement: false,
+    HTMLMeterElement: false,
+    HTMLModElement: false,
+    HTMLOListElement: false,
+    HTMLObjectElement: false,
+    HTMLOptGroupElement: false,
+    HTMLOptionElement: false,
+    Option: false,
+    HTMLOptionsCollection: false,
+    HTMLOutputElement: false,
+    HTMLParagraphElement: false,
+    HTMLParamElement: false,
+    HTMLPictureElement: false,
+    HTMLPreElement: false,
+    HTMLProgressElement: false,
+    HTMLQuoteElement: false,
+    HTMLScriptElement: false,
+    HTMLSelectElement: false,
+    HTMLSlotElement: false,
+    HTMLSourceElement: false,
+    HTMLSpanElement: false,
+    HTMLStyleElement: false,
+    HTMLTableCaptionElement: false,
+    HTMLTableCellElement: false,
+    HTMLTableColElement: false,
+    HTMLTableElement: false,
+    HTMLTableRowElement: false,
+    HTMLTableSectionElement: false,
+    HTMLTemplateElement: false,
+    HTMLTextAreaElement: false,
+    HTMLTimeElement: false,
+    HTMLTitleElement: false,
+    HTMLTrackElement: false,
+    HTMLUListElement: false,
+    HTMLUnknownElement: false,
+    HTMLVideoElement: false,
+    HashChangeEvent: false,
+    Headers: false,
+    HeapSnapshot: false,
+    History: false,
+    IDBCursor: false,
+    IDBCursorWithValue: false,
+    IDBDatabase: false,
+    IDBFactory: false,
+    IDBFileHandle: false,
+    IDBFileRequest: false,
+    IDBIndex: false,
+    IDBKeyRange: false,
+    IDBLocaleAwareKeyRange: false,
+    IDBMutableFile: false,
+    IDBObjectStore: false,
+    IDBOpenDBRequest: false,
+    IDBRequest: false,
+    IDBTransaction: false,
+    IDBVersionChangeEvent: false,
+    IIRFilterNode: false,
+    IdleDeadline: false,
+    ImageBitmap: false,
+    ImageBitmapRenderingContext: false,
+    ImageCapture: false,
+    ImageCaptureErrorEvent: false,
+    ImageData: false,
+    ImageDocument: false,
+    InputEvent: false,
+    InspectorFontFace: false,
+    InspectorUtils: false,
+    InstallTriggerImpl: false,
+    IntersectionObserver: false,
+    IntersectionObserverEntry: false,
+    IOUtils: false,
+    JSProcessActorChild: false,
+    JSProcessActorParent: false,
+    JSWindowActorChild: false,
+    JSWindowActorParent: false,
+    KeyEvent: false,
+    KeyboardEvent: false,
+    KeyframeEffect: false,
+    L10nFileSource: false,
+    L10nRegistry: false,
+    Localization: false,
+    Location: false,
+    MIDIAccess: false,
+    MIDIConnectionEvent: false,
+    MIDIInput: false,
+    MIDIInputMap: false,
+    MIDIMessageEvent: false,
+    MIDIOutput: false,
+    MIDIOutputMap: false,
+    MIDIPort: false,
+    MatchGlob: false,
+    MatchPattern: false,
+    MatchPatternSet: false,
+    MediaCapabilities: false,
+    MediaCapabilitiesInfo: false,
+    MediaControlService: false,
+    MediaDeviceInfo: false,
+    MediaDevices: false,
+    MediaElementAudioSourceNode: false,
+    MediaEncryptedEvent: false,
+    MediaError: false,
+    MediaKeyError: false,
+    MediaKeyMessageEvent: false,
+    MediaKeySession: false,
+    MediaKeyStatusMap: false,
+    MediaKeySystemAccess: false,
+    MediaKeys: false,
+    MediaList: false,
+    MediaQueryList: false,
+    MediaQueryListEvent: false,
+    MediaRecorder: false,
+    MediaRecorderErrorEvent: false,
+    MediaSource: false,
+    MediaStream: false,
+    MediaStreamAudioDestinationNode: false,
+    MediaStreamAudioSourceNode: false,
+    MediaStreamEvent: false,
+    MediaStreamTrack: false,
+    MediaStreamTrackEvent: false,
+    MerchantValidationEvent: false,
+    MessageBroadcaster: false,
+    MessageChannel: false,
+    MessageEvent: false,
+    MessageListenerManager: false,
+    MessagePort: false,
+    MessageSender: false,
+    MimeType: false,
+    MimeTypeArray: false,
+    MouseEvent: false,
+    MouseScrollEvent: false,
+    MozCanvasPrintState: false,
+    MozDocumentMatcher: false,
+    MozDocumentObserver: false,
+    MozQueryInterface: false,
+    MozSharedMap: false,
+    MozSharedMapChangeEvent: false,
+    MozStorageAsyncStatementParams: false,
+    MozStorageStatementParams: false,
+    MozStorageStatementRow: false,
+    MozWritableSharedMap: false,
+    MutationEvent: false,
+    MutationObserver: false,
+    MutationRecord: false,
+    NamedNodeMap: false,
+    Navigator: false,
+    NetworkInformation: false,
+    Node: false,
+    NodeFilter: false,
+    NodeIterator: false,
+    NodeList: false,
+    Notification: false,
+    NotifyPaintEvent: false,
+    OfflineAudioCompletionEvent: false,
+    OfflineAudioContext: false,
+    OfflineResourceList: false,
+    OffscreenCanvas: false,
+    OscillatorNode: false,
+    PageTransitionEvent: false,
+    PaintRequest: false,
+    PaintRequestList: false,
+    PannerNode: false,
+    ParentProcessMessageManager: false,
+    Path2D: false,
+    PathUtils: false,
+    PaymentAddress: false,
+    PaymentMethodChangeEvent: false,
+    PaymentRequest: false,
+    PaymentRequestUpdateEvent: false,
+    PaymentResponse: false,
+    PeerConnectionImpl: false,
+    PeerConnectionObserver: false,
+    Performance: false,
+    PerformanceEntry: false,
+    PerformanceEntryEvent: false,
+    PerformanceMark: false,
+    PerformanceMeasure: false,
+    PerformanceNavigation: false,
+    PerformanceNavigationTiming: false,
+    PerformanceObserver: false,
+    PerformanceObserverEntryList: false,
+    PerformanceResourceTiming: false,
+    PerformanceServerTiming: false,
+    PerformanceTiming: false,
+    PeriodicWave: false,
+    PermissionStatus: false,
+    Permissions: false,
+    PlacesBookmark: false,
+    PlacesBookmarkAddition: false,
+    PlacesBookmarkGuid: false,
+    PlacesBookmarkKeyword: false,
+    PlacesBookmarkMoved: false,
+    PlacesBookmarkRemoved: false,
+    PlacesBookmarkTags: false,
+    PlacesBookmarkTime: false,
+    PlacesBookmarkTitle: false,
+    PlacesBookmarkUrl: false,
+    PlacesEvent: false,
+    PlacesHistoryCleared: false,
+    PlacesObservers: false,
+    PlacesPurgeCaches: false,
+    PlacesRanking: false,
+    PlacesVisit: false,
+    PlacesVisitRemoved: false,
+    PlacesVisitTitle: false,
+    PlacesWeakCallbackWrapper: false,
+    Plugin: false,
+    PluginArray: false,
+    PluginCrashedEvent: false,
+    PointerEvent: false,
+    PopStateEvent: false,
+    PopupBlockedEvent: false,
+    PrecompiledScript: false,
+    Presentation: false,
+    PresentationAvailability: false,
+    PresentationConnection: false,
+    PresentationConnectionAvailableEvent: false,
+    PresentationConnectionCloseEvent: false,
+    PresentationConnectionList: false,
+    PresentationReceiver: false,
+    PresentationRequest: false,
+    PrioEncoder: false,
+    ProcessMessageManager: false,
+    ProcessingInstruction: false,
+    ProgressEvent: false,
+    PromiseDebugging: false,
+    PromiseRejectionEvent: false,
+    PublicKeyCredential: false,
+    PushManager: false,
+    PushManagerImpl: false,
+    PushSubscription: false,
+    PushSubscriptionOptions: false,
+    RTCCertificate: false,
+    RTCDTMFSender: false,
+    RTCDTMFToneChangeEvent: false,
+    RTCDataChannel: false,
+    RTCDataChannelEvent: false,
+    RTCIceCandidate: false,
+    RTCPeerConnection: false,
+    RTCPeerConnectionIceEvent: false,
+    RTCPeerConnectionStatic: false,
+    RTCRtpReceiver: false,
+    RTCRtpSender: false,
+    RTCRtpTransceiver: false,
+    RTCSessionDescription: false,
+    RTCStatsReport: false,
+    RTCTrackEvent: false,
+    RadioNodeList: false,
+    Range: false,
+    ReadableStreamBYOBReader: false,
+    ReadableStreamBYOBRequest: false,
+    ReadableByteStreamController: false,
+    ReadableStream: false,
+    ReadableStreamDefaultController: false,
+    ReadableStreamDefaultReader: false,
+    Report: false,
+    ReportBody: false,
+    ReportingObserver: false,
+    Request: false,
+    Response: false,
+    SessionStoreUtils: false,
+    SVGAElement: false,
+    SVGAngle: false,
+    SVGAnimateElement: false,
+    SVGAnimateMotionElement: false,
+    SVGAnimateTransformElement: false,
+    SVGAnimatedAngle: false,
+    SVGAnimatedBoolean: false,
+    SVGAnimatedEnumeration: false,
+    SVGAnimatedInteger: false,
+    SVGAnimatedLength: false,
+    SVGAnimatedLengthList: false,
+    SVGAnimatedNumber: false,
+    SVGAnimatedNumberList: false,
+    SVGAnimatedPreserveAspectRatio: false,
+    SVGAnimatedRect: false,
+    SVGAnimatedString: false,
+    SVGAnimatedTransformList: false,
+    SVGAnimationElement: false,
+    SVGCircleElement: false,
+    SVGClipPathElement: false,
+    SVGComponentTransferFunctionElement: false,
+    SVGDefsElement: false,
+    SVGDescElement: false,
+    SVGElement: false,
+    SVGEllipseElement: false,
+    SVGFEBlendElement: false,
+    SVGFEColorMatrixElement: false,
+    SVGFEComponentTransferElement: false,
+    SVGFECompositeElement: false,
+    SVGFEConvolveMatrixElement: false,
+    SVGFEDiffuseLightingElement: false,
+    SVGFEDisplacementMapElement: false,
+    SVGFEDistantLightElement: false,
+    SVGFEDropShadowElement: false,
+    SVGFEFloodElement: false,
+    SVGFEFuncAElement: false,
+    SVGFEFuncBElement: false,
+    SVGFEFuncGElement: false,
+    SVGFEFuncRElement: false,
+    SVGFEGaussianBlurElement: false,
+    SVGFEImageElement: false,
+    SVGFEMergeElement: false,
+    SVGFEMergeNodeElement: false,
+    SVGFEMorphologyElement: false,
+    SVGFEOffsetElement: false,
+    SVGFEPointLightElement: false,
+    SVGFESpecularLightingElement: false,
+    SVGFESpotLightElement: false,
+    SVGFETileElement: false,
+    SVGFETurbulenceElement: false,
+    SVGFilterElement: false,
+    SVGForeignObjectElement: false,
+    SVGGElement: false,
+    SVGGeometryElement: false,
+    SVGGradientElement: false,
+    SVGGraphicsElement: false,
+    SVGImageElement: false,
+    SVGLength: false,
+    SVGLengthList: false,
+    SVGLineElement: false,
+    SVGLinearGradientElement: false,
+    SVGMPathElement: false,
+    SVGMarkerElement: false,
+    SVGMaskElement: false,
+    SVGMatrix: false,
+    SVGMetadataElement: false,
+    SVGNumber: false,
+    SVGNumberList: false,
+    SVGPathElement: false,
+    SVGPathSegList: false,
+    SVGPatternElement: false,
+    SVGPoint: false,
+    SVGPointList: false,
+    SVGPolygonElement: false,
+    SVGPolylineElement: false,
+    SVGPreserveAspectRatio: false,
+    SVGRadialGradientElement: false,
+    SVGRect: false,
+    SVGRectElement: false,
+    SVGSVGElement: false,
+    SVGScriptElement: false,
+    SVGSetElement: false,
+    SVGStopElement: false,
+    SVGStringList: false,
+    SVGStyleElement: false,
+    SVGSwitchElement: false,
+    SVGSymbolElement: false,
+    SVGTSpanElement: false,
+    SVGTextContentElement: false,
+    SVGTextElement: false,
+    SVGTextPathElement: false,
+    SVGTextPositioningElement: false,
+    SVGTitleElement: false,
+    SVGTransform: false,
+    SVGTransformList: false,
+    SVGUnitTypes: false,
+    SVGUseElement: false,
+    SVGViewElement: false,
+    SVGZoomAndPan: false,
+    Screen: false,
+    ScreenLuminance: false,
+    ScreenOrientation: false,
+    ScriptProcessorNode: false,
+    ScrollAreaEvent: false,
+    ScrollViewChangeEvent: false,
+    SecurityPolicyViolationEvent: false,
+    Selection: false,
+    ServiceWorker: false,
+    ServiceWorkerContainer: false,
+    ServiceWorkerRegistration: false,
+    ShadowRoot: false,
+    SharedWorker: false,
+    SimpleGestureEvent: false,
+    SourceBuffer: false,
+    SourceBufferList: false,
+    SpeechGrammar: false,
+    SpeechGrammarList: false,
+    SpeechRecognition: false,
+    SpeechRecognitionAlternative: false,
+    SpeechRecognitionError: false,
+    SpeechRecognitionEvent: false,
+    SpeechRecognitionResult: false,
+    SpeechRecognitionResultList: false,
+    SpeechSynthesis: false,
+    SpeechSynthesisErrorEvent: false,
+    SpeechSynthesisEvent: false,
+    SpeechSynthesisUtterance: false,
+    SpeechSynthesisVoice: false,
+    StereoPannerNode: false,
+    Storage: false,
+    StorageEvent: false,
+    StorageManager: false,
+    StreamFilter: false,
+    StreamFilterDataEvent: false,
+    StructuredCloneHolder: false,
+    StructuredCloneTester: false,
+    StyleSheet: false,
+    StyleSheetApplicableStateChangeEvent: false,
+    StyleSheetList: false,
+    SubtleCrypto: false,
+    SyncMessageSender: false,
+    TCPServerSocket: false,
+    TCPServerSocketEvent: false,
+    TCPSocket: false,
+    TCPSocketErrorEvent: false,
+    TCPSocketEvent: false,
+    TelemetryStopwatch: false,
+    TestingDeprecatedInterface: false,
+    Text: false,
+    TextClause: false,
+    TextDecoder: false,
+    TextEncoder: false,
+    TextMetrics: false,
+    TextTrack: false,
+    TextTrackCue: false,
+    TextTrackCueList: false,
+    TextTrackList: false,
+    TimeEvent: false,
+    TimeRanges: false,
+    Touch: false,
+    TouchEvent: false,
+    TouchList: false,
+    TrackEvent: false,
+    TransceiverImpl: false,
+    TransformStream: false,
+    TransformStreamDefaultController: false,
+    TransitionEvent: false,
+    TreeColumn: false,
+    TreeColumns: false,
+    TreeContentView: false,
+    TreeWalker: false,
+    U2F: false,
+    UDPMessageEvent: false,
+    UDPSocket: false,
+    UIEvent: false,
+    URL: false,
+    URLSearchParams: false,
+    UserInteraction: false,
+    UserProximityEvent: false,
+    VRDisplay: false,
+    VRDisplayCapabilities: false,
+    VRDisplayEvent: false,
+    VREyeParameters: false,
+    VRFieldOfView: false,
+    VRFrameData: false,
+    VRMockController: false,
+    VRMockDisplay: false,
+    VRPose: false,
+    VRServiceTest: false,
+    VRStageParameters: false,
+    VRSubmitFrameResult: false,
+    VTTCue: false,
+    VTTRegion: false,
+    ValidityState: false,
+    VideoPlaybackQuality: false,
+    VideoTrack: false,
+    VideoTrackList: false,
+    VisualViewport: false,
+    WaveShaperNode: false,
+    WebExtensionContentScript: false,
+    WebExtensionPolicy: false,
+    WebGL2RenderingContext: false,
+    WebGLActiveInfo: false,
+    WebGLBuffer: false,
+    WebGLContextEvent: false,
+    WebGLFramebuffer: false,
+    WebGLProgram: false,
+    WebGLQuery: false,
+    WebGLRenderbuffer: false,
+    WebGLRenderingContext: false,
+    WebGLSampler: false,
+    WebGLShader: false,
+    WebGLShaderPrecisionFormat: false,
+    WebGLSync: false,
+    WebGLTexture: false,
+    WebGLTransformFeedback: false,
+    WebGLUniformLocation: false,
+    WebGLVertexArrayObject: false,
+    WebGPU: false,
+    WebGPUAdapter: false,
+    WebGPUAttachmentState: false,
+    WebGPUBindGroup: false,
+    WebGPUBindGroupLayout: false,
+    WebGPUBindingType: false,
+    WebGPUBlendFactor: false,
+    WebGPUBlendOperation: false,
+    WebGPUBlendState: false,
+    WebGPUBuffer: false,
+    WebGPUBufferUsage: false,
+    WebGPUColorWriteBits: false,
+    WebGPUCommandBuffer: false,
+    WebGPUCommandEncoder: false,
+    WebGPUCompareFunction: false,
+    WebGPUComputePipeline: false,
+    WebGPUDepthStencilState: false,
+    WebGPUDevice: false,
+    WebGPUFence: false,
+    WebGPUFilterMode: false,
+    WebGPUIndexFormat: false,
+    WebGPUInputState: false,
+    WebGPUInputStepMode: false,
+    WebGPULoadOp: false,
+    WebGPULogEntry: false,
+    WebGPUPipelineLayout: false,
+    WebGPUPrimitiveTopology: false,
+    WebGPUQueue: false,
+    WebGPURenderPipeline: false,
+    WebGPUSampler: false,
+    WebGPUShaderModule: false,
+    WebGPUShaderStage: false,
+    WebGPUShaderStageBit: false,
+    WebGPUStencilOperation: false,
+    WebGPUStoreOp: false,
+    WebGPUSwapChain: false,
+    WebGPUTexture: false,
+    WebGPUTextureDimension: false,
+    WebGPUTextureFormat: false,
+    WebGPUTextureUsage: false,
+    WebGPUTextureView: false,
+    WebGPUVertexFormat: false,
+    WebKitCSSMatrix: false,
+    WebSocket: false,
+    WebrtcGlobalInformation: false,
+    WheelEvent: false,
+    Window: false,
+    WindowGlobalChild: false,
+    WindowGlobalParent: false,
+    WindowRoot: false,
+    Worker: false,
+    Worklet: false,
+    WritableStream: false,
+    WritableStreamDefaultController: false,
+    WritableStreamDefaultWriter: false,
+    XMLDocument: false,
+    XMLHttpRequest: false,
+    XMLHttpRequestEventTarget: false,
+    XMLHttpRequestUpload: false,
+    XMLSerializer: false,
+    XPathEvaluator: false,
+    XPathExpression: false,
+    XPathResult: false,
+    XSLTProcessor: false,
+    XULCommandEvent: false,
+    XULElement: false,
+    XULFrameElement: false,
+    XULMenuElement: false,
+    XULPopupElement: false,
+    XULScrollElement: false,
+    XULTextElement: false,
+    console: false,
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/process-script.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/process-script.js
new file mode 100644
index 0000000000..f329a6650b
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/process-script.js
@@ -0,0 +1,38 @@
+/**
+ * @fileoverview Defines the environment for process scripts.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  globals: {
+    // dom/chrome-webidl/MessageManager.webidl
+
+    // MessageManagerGlobal
+    dump: false,
+    atob: false,
+    btoa: false,
+
+    // MessageListenerManagerMixin
+    addMessageListener: false,
+    removeMessageListener: false,
+    addWeakMessageListener: false,
+    removeWeakMessageListener: false,
+
+    // MessageSenderMixin
+    sendAsyncMessage: false,
+    processMessageManager: false,
+    remoteType: false,
+
+    // SyncMessageSenderMixin
+    sendSyncMessage: false,
+
+    // ContentProcessMessageManager
+    initialProcessData: false,
+    sharedData: false,
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/remote-page.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/remote-page.js
new file mode 100644
index 0000000000..5b362ea2e0
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/remote-page.js
@@ -0,0 +1,43 @@
+/**
+ * @fileoverview Defines the environment for remote page.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  globals: {
+    atob: false,
+    btoa: false,
+    RPMAddTRRExcludedDomain: false,
+    RPMGetAppBuildID: false,
+    RPMGetInnerMostURI: false,
+    RPMGetIntPref: false,
+    RPMGetStringPref: false,
+    RPMGetBoolPref: false,
+    RPMSetBoolPref: false,
+    RPMGetFormatURLPref: false,
+    RPMIsTRROnlyFailure: false,
+    RPMIsFirefox: false,
+    RPMIsNativeFallbackFailure: false,
+    RPMIsWindowPrivate: false,
+    RPMSendAsyncMessage: false,
+    RPMSendQuery: false,
+    RPMAddMessageListener: false,
+    RPMRecordTelemetryEvent: false,
+    RPMCheckAlternateHostAvailable: false,
+    RPMAddToHistogram: false,
+    RPMRemoveMessageListener: false,
+    RPMGetHttpResponseHeader: false,
+    RPMTryPingSecureWWWLink: false,
+    RPMOpenSecureWWWLink: false,
+    RPMOpenPreferences: false,
+    RPMGetTRRSkipReason: false,
+    RPMGetTRRDomain: false,
+    RPMIsSiteSpecificTRRError: false,
+    RPMSetTRRDisabledLoadFlags: false,
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/simpletest.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/simpletest.js
new file mode 100644
index 0000000000..2f5dd5c33e
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/simpletest.js
@@ -0,0 +1,35 @@
+/**
+ * @fileoverview Defines the environment for scripts that use the SimpleTest
+ *               mochitest harness. Imports the globals from the relevant files.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+var path = require("path");
+var { getScriptGlobals } = require("./utils");
+
+// When updating this list, be sure to also update the 'support-files' config
+// in `tools/lint/eslint.yml`.
+const simpleTestFiles = [
+  "AccessibilityUtils.js",
+  "ExtensionTestUtils.js",
+  "EventUtils.js",
+  "MockObjects.js",
+  "SimpleTest.js",
+  "WindowSnapshot.js",
+  "paint_listener.js",
+];
+const simpleTestPath = "testing/mochitest/tests/SimpleTest";
+
+module.exports = getScriptGlobals(
+  "simpletest",
+  simpleTestFiles.map(file => path.join(simpleTestPath, file))
+);
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/sjs.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/sjs.js
new file mode 100644
index 0000000000..995c3173d2
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/sjs.js
@@ -0,0 +1,30 @@
+/**
+ * @fileoverview Defines the environment for sjs files.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  globals: {
+    // All these variables are hard-coded to be available for sjs scopes only.
+    // https://searchfox.org/mozilla-central/rev/26a1b0fce12e6dd495a954c542bb1e7bd6e0d548/netwerk/test/httpserver/httpd.js#2879
+    atob: false,
+    btoa: false,
+    ChromeUtils: false,
+    dump: false,
+    getState: false,
+    setState: false,
+    getSharedState: false,
+    setSharedState: false,
+    getObjectState: false,
+    setObjectState: false,
+    registerPathHandler: false,
+    Services: false,
+    // importScripts is also available.
+    importScripts: false,
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/special-powers-sandbox.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/special-powers-sandbox.js
new file mode 100644
index 0000000000..5a28c91883
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/special-powers-sandbox.js
@@ -0,0 +1,46 @@
+/**
+ * @fileoverview Defines the environment for SpecialPowers sandbox.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  globals: {
+    // wantComponents defaults to true,
+    Components: false,
+    Ci: false,
+    Cr: false,
+    Cc: false,
+    Cu: false,
+    Services: false,
+
+    // testing/specialpowers/content/SpecialPowersSandbox.sys.mjs
+
+    // SANDBOX_GLOBALS
+    Blob: false,
+    ChromeUtils: false,
+    FileReader: false,
+    TextDecoder: false,
+    TextEncoder: false,
+    URL: false,
+
+    // EXTRA_IMPORTS
+    EventUtils: false,
+
+    // SpecialPowersSandbox constructor
+    assert: false,
+    Assert: false,
+    BrowsingContext: false,
+    InspectorUtils: false,
+    ok: false,
+    is: false,
+    isnot: false,
+    todo: false,
+    todo_is: false,
+    info: false,
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/specific.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/specific.js
new file mode 100644
index 0000000000..23ebcb5bb1
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/specific.js
@@ -0,0 +1,31 @@
+/**
+ * @fileoverview Defines the environment for the Firefox browser. Allows global
+ *               variables which are non-standard and specific to Firefox.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  globals: {
+    Cc: false,
+    ChromeUtils: false,
+    Ci: false,
+    Components: false,
+    Cr: false,
+    Cu: false,
+    Debugger: false,
+    InstallTrigger: false,
+    // https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/InternalError
+    InternalError: true,
+    Services: false,
+    // https://developer.mozilla.org/docs/Web/API/Window/dump
+    dump: true,
+    openDialog: false,
+    // https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/uneval
+    uneval: false,
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/utils.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/utils.js
new file mode 100644
index 0000000000..aeda690ba5
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/utils.js
@@ -0,0 +1,62 @@
+/**
+ * @fileoverview Provides utilities for setting up environments.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var path = require("path");
+var helpers = require("../helpers");
+var globals = require("../globals");
+
+/**
+ * Obtains the globals for a list of files.
+ *
+ * @param {Array.<String>} files
+ *   The array of files to get globals for. The paths are relative to the topsrcdir.
+ * @returns {Object}
+ *   Returns an object with keys of the global names and values of if they are
+ *   writable or not.
+ */
+function getGlobalsForScripts(environmentName, files, extraDefinitions) {
+  let fileGlobals = extraDefinitions;
+  const root = helpers.rootDir;
+  for (const file of files) {
+    const fileName = path.join(root, file);
+    try {
+      fileGlobals = fileGlobals.concat(globals.getGlobalsForFile(fileName));
+    } catch (e) {
+      console.error(`Could not load globals from file ${fileName}: ${e}`);
+      console.error(
+        `You may need to update the mappings for the ${environmentName} environment`
+      );
+      throw new Error(`Could not load globals from file ${fileName}: ${e}`);
+    }
+  }
+
+  var globalObjects = {};
+  for (let global of fileGlobals) {
+    globalObjects[global.name] = global.writable;
+  }
+  return globalObjects;
+}
+
+module.exports = {
+  getScriptGlobals(
+    environmentName,
+    files,
+    extraDefinitions = [],
+    extraEnv = {}
+  ) {
+    if (helpers.isMozillaCentralBased()) {
+      return {
+        globals: getGlobalsForScripts(environmentName, files, extraDefinitions),
+        ...extraEnv,
+      };
+    }
+    return helpers.getSavedEnvironmentItems(environmentName);
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/xpcshell.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/xpcshell.js
new file mode 100644
index 0000000000..408bc2e277
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/xpcshell.js
@@ -0,0 +1,59 @@
+/**
+ * @fileoverview Defines the environment for xpcshell test files.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var { getScriptGlobals } = require("./utils");
+
+const extraGlobals = [
+  // Defined in XPCShellImpl.cpp
+  "print",
+  "readline",
+  "load",
+  "quit",
+  "dumpXPC",
+  "dump",
+  "gc",
+  "gczeal",
+  "options",
+  "sendCommand",
+  "atob",
+  "btoa",
+  "setInterruptCallback",
+  "simulateNoScriptActivity",
+  "registerXPCTestComponents",
+
+  // Assert.sys.mjs globals.
+  "setReporter",
+  "report",
+  "ok",
+  "equal",
+  "notEqual",
+  "deepEqual",
+  "notDeepEqual",
+  "strictEqual",
+  "notStrictEqual",
+  "throws",
+  "rejects",
+  "greater",
+  "greaterOrEqual",
+  "less",
+  "lessOrEqual",
+  // TestingFunctions.cpp globals
+  "allocationMarker",
+  "byteSize",
+  "saveStack",
+];
+
+module.exports = getScriptGlobals(
+  "xpcshell",
+  ["testing/xpcshell/head.js"],
+  extraGlobals.map(g => {
+    return { name: g, writable: false };
+  })
+);
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/globals.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/globals.js
new file mode 100644
index 0000000000..aa3d4258ae
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/globals.js
@@ -0,0 +1,665 @@
+/**
+ * @fileoverview functions for scanning an AST for globals including
+ *               traversing referenced scripts.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const path = require("path");
+const fs = require("fs");
+const helpers = require("./helpers");
+const htmlparser = require("htmlparser2");
+
+const callExpressionDefinitions = [
+  /^loader\.lazyGetter\((?:globalThis|this), "(\w+)"/,
+  /^loader\.lazyServiceGetter\((?:globalThis|this), "(\w+)"/,
+  /^loader\.lazyRequireGetter\((?:globalThis|this), "(\w+)"/,
+  /^XPCOMUtils\.defineLazyGetter\((?:globalThis|this), "(\w+)"/,
+  /^XPCOMUtils\.defineLazyModuleGetter\((?:globalThis|this), "(\w+)"/,
+  /^ChromeUtils\.defineLazyGetter\((?:globalThis|this), "(\w+)"/,
+  /^ChromeUtils\.defineModuleGetter\((?:globalThis|this), "(\w+)"/,
+  /^XPCOMUtils\.defineLazyPreferenceGetter\((?:globalThis|this), "(\w+)"/,
+  /^XPCOMUtils\.defineLazyProxy\((?:globalThis|this), "(\w+)"/,
+  /^XPCOMUtils\.defineLazyScriptGetter\((?:globalThis|this), "(\w+)"/,
+  /^XPCOMUtils\.defineLazyServiceGetter\((?:globalThis|this), "(\w+)"/,
+  /^XPCOMUtils\.defineConstant\((?:globalThis|this), "(\w+)"/,
+  /^DevToolsUtils\.defineLazyModuleGetter\((?:globalThis|this), "(\w+)"/,
+  /^DevToolsUtils\.defineLazyGetter\((?:globalThis|this), "(\w+)"/,
+  /^Object\.defineProperty\((?:globalThis|this), "(\w+)"/,
+  /^Reflect\.defineProperty\((?:globalThis|this), "(\w+)"/,
+  /^this\.__defineGetter__\("(\w+)"/,
+];
+
+const callExpressionMultiDefinitions = [
+  "XPCOMUtils.defineLazyGlobalGetters(this,",
+  "XPCOMUtils.defineLazyGlobalGetters(globalThis,",
+  "XPCOMUtils.defineLazyModuleGetters(this,",
+  "XPCOMUtils.defineLazyModuleGetters(globalThis,",
+  "XPCOMUtils.defineLazyServiceGetters(this,",
+  "XPCOMUtils.defineLazyServiceGetters(globalThis,",
+  "ChromeUtils.defineESModuleGetters(this,",
+  "ChromeUtils.defineESModuleGetters(globalThis,",
+  "loader.lazyRequireGetter(this,",
+  "loader.lazyRequireGetter(globalThis,",
+];
+
+const subScriptMatches = [
+  /Services\.scriptloader\.loadSubScript\("(.*?)", this\)/,
+];
+
+const workerImportFilenameMatch = /(.*\/)*((.*?)\.jsm?)/;
+
+/**
+ * Parses a list of "name:boolean_value" or/and "name" options divided by comma
+ * or whitespace.
+ *
+ * This function was copied from eslint.js
+ *
+ * @param {string} string The string to parse.
+ * @param {Comment} comment The comment node which has the string.
+ * @returns {Object} Result map object of names and boolean values
+ */
+function parseBooleanConfig(string, comment) {
+  let items = {};
+
+  // Collapse whitespace around : to make parsing easier
+  string = string.replace(/\s*:\s*/g, ":");
+  // Collapse whitespace around ,
+  string = string.replace(/\s*,\s*/g, ",");
+
+  string.split(/\s|,+/).forEach(function (name) {
+    if (!name) {
+      return;
+    }
+
+    let pos = name.indexOf(":");
+    let value;
+    if (pos !== -1) {
+      value = name.substring(pos + 1, name.length);
+      name = name.substring(0, pos);
+    }
+
+    items[name] = {
+      value: value === "true",
+      comment,
+    };
+  });
+
+  return items;
+}
+
+/**
+ * Global discovery can require parsing many files. This map of
+ * {String} => {Object} caches what globals were discovered for a file path.
+ */
+const globalCache = new Map();
+
+/**
+ * Global discovery can occasionally meet circular dependencies due to the way
+ * js files are included via html/xhtml files etc. This set is used to avoid
+ * getting into loops whilst the discovery is in progress.
+ */
+var globalDiscoveryInProgressForFiles = new Set();
+
+/**
+ * When looking for globals in HTML files, it can be common to have more than
+ * one script tag with inline javascript. These will normally be called together,
+ * so we store the globals for just the last HTML file processed.
+ */
+var lastHTMLGlobals = {};
+
+/**
+ * Attempts to convert an CallExpressions that look like module imports
+ * into global variable definitions.
+ *
+ * @param  {Object} node
+ *         The AST node to convert.
+ * @param  {boolean} isGlobal
+ *         True if the current node is in the global scope.
+ *
+ * @return {Array}
+ *         An array of objects that contain details about the globals:
+ *         - {String} name
+ *                    The name of the global.
+ *         - {Boolean} writable
+ *                     If the global is writeable or not.
+ */
+function convertCallExpressionToGlobals(node, isGlobal) {
+  let express = node.expression;
+  if (
+    express.type === "CallExpression" &&
+    express.callee.type === "MemberExpression" &&
+    express.callee.object &&
+    express.callee.object.type === "Identifier" &&
+    express.arguments.length === 1 &&
+    express.arguments[0].type === "ArrayExpression" &&
+    express.callee.property.type === "Identifier" &&
+    express.callee.property.name === "importGlobalProperties"
+  ) {
+    return express.arguments[0].elements.map(literal => {
+      return {
+        explicit: true,
+        name: literal.value,
+        writable: false,
+      };
+    });
+  }
+
+  let source;
+  try {
+    source = helpers.getASTSource(node);
+  } catch (e) {
+    return [];
+  }
+
+  // The definition matches below must be in the global scope for us to define
+  // a global, so bail out early if we're not a global.
+  if (!isGlobal) {
+    return [];
+  }
+
+  for (let reg of subScriptMatches) {
+    let match = source.match(reg);
+    if (match) {
+      return getGlobalsForScript(match[1], "script").map(g => {
+        // We don't want any loadSubScript globals to be explicit, as this
+        // could trigger no-unused-vars when importing multiple variables
+        // from a script and not using all of them.
+        g.explicit = false;
+        return g;
+      });
+    }
+  }
+
+  for (let reg of callExpressionDefinitions) {
+    let match = source.match(reg);
+    if (match) {
+      return [{ name: match[1], writable: true, explicit: true }];
+    }
+  }
+
+  if (
+    callExpressionMultiDefinitions.some(expr => source.startsWith(expr)) &&
+    node.expression.arguments[1]
+  ) {
+    let arg = node.expression.arguments[1];
+    if (arg.type === "ObjectExpression") {
+      return arg.properties
+        .map(p => ({
+          name: p.type === "Property" && p.key.name,
+          writable: true,
+          explicit: true,
+        }))
+        .filter(g => g.name);
+    }
+    if (arg.type === "ArrayExpression") {
+      return arg.elements
+        .map(p => ({
+          name: p.type === "Literal" && p.value,
+          writable: true,
+          explicit: true,
+        }))
+        .filter(g => typeof g.name == "string");
+    }
+  }
+
+  if (
+    node.expression.callee.type == "MemberExpression" &&
+    node.expression.callee.property.type == "Identifier" &&
+    node.expression.callee.property.name == "defineLazyScriptGetter"
+  ) {
+    // The case where we have a single symbol as a string has already been
+    // handled by the regexp, so we have an array of symbols here.
+    return node.expression.arguments[1].elements.map(n => ({
+      name: n.value,
+      writable: true,
+      explicit: true,
+    }));
+  }
+
+  return [];
+}
+
+/**
+ * Attempts to convert an AssignmentExpression into a global variable
+ * definition if it applies to `this` in the global scope.
+ *
+ * @param  {Object} node
+ *         The AST node to convert.
+ * @param  {boolean} isGlobal
+ *         True if the current node is in the global scope.
+ *
+ * @return {Array}
+ *         An array of objects that contain details about the globals:
+ *         - {String} name
+ *                    The name of the global.
+ *         - {Boolean} writable
+ *                     If the global is writeable or not.
+ */
+function convertThisAssignmentExpressionToGlobals(node, isGlobal) {
+  if (
+    isGlobal &&
+    node.expression.left &&
+    node.expression.left.object &&
+    node.expression.left.object.type === "ThisExpression" &&
+    node.expression.left.property &&
+    node.expression.left.property.type === "Identifier"
+  ) {
+    return [{ name: node.expression.left.property.name, writable: true }];
+  }
+  return [];
+}
+
+/**
+ * Attempts to convert an ExpressionStatement to likely global variable
+ * definitions.
+ *
+ * @param  {Object} node
+ *         The AST node to convert.
+ * @param  {boolean} isGlobal
+ *         True if the current node is in the global scope.
+ *
+ * @return {Array}
+ *         An array of objects that contain details about the globals:
+ *         - {String} name
+ *                    The name of the global.
+ *         - {Boolean} writable
+ *                     If the global is writeable or not.
+ */
+function convertWorkerExpressionToGlobals(node, isGlobal, dirname) {
+  let results = [];
+  let expr = node.expression;
+
+  if (
+    node.expression.type === "CallExpression" &&
+    expr.callee &&
+    expr.callee.type === "Identifier" &&
+    expr.callee.name === "importScripts"
+  ) {
+    for (var arg of expr.arguments) {
+      var match = arg.value && arg.value.match(workerImportFilenameMatch);
+      if (match) {
+        if (!match[1]) {
+          let filePath = path.resolve(dirname, match[2]);
+          if (fs.existsSync(filePath)) {
+            let additionalGlobals = module.exports.getGlobalsForFile(filePath);
+            results = results.concat(additionalGlobals);
+          }
+        }
+        // Import with relative/absolute path should explicitly use
+        // `import-globals-from` comment.
+      }
+    }
+  }
+
+  return results;
+}
+
+/**
+ * Attempts to load the globals for a given script.
+ *
+ * @param {string} src
+ *   The source path or url of the script to look for.
+ * @param {string} type
+ *   The type of the current file (script/module).
+ * @param {string} [dir]
+ *   The directory of the current file.
+ * @returns {object[]}
+ *   An array of objects with details of the globals in them.
+ */
+function getGlobalsForScript(src, type, dir) {
+  let scriptName;
+  if (src.includes("http:")) {
+    // We don't handle this currently as the paths are complex to match.
+  } else if (src.startsWith("chrome://mochikit/content/")) {
+    // Various ways referencing test files.
+    src = src.replace("chrome://mochikit/content/", "/");
+    scriptName = path.join(helpers.rootDir, "testing", "mochitest", src);
+  } else if (src.startsWith("chrome://mochitests/content/browser")) {
+    src = src.replace("chrome://mochitests/content/browser", "");
+    scriptName = path.join(helpers.rootDir, src);
+  } else if (src.includes("SimpleTest")) {
+    // This is another way of referencing test files...
+    scriptName = path.join(helpers.rootDir, "testing", "mochitest", src);
+  } else if (src.startsWith("/tests/")) {
+    scriptName = path.join(helpers.rootDir, src.substring(7));
+  } else if (dir) {
+    // Fallback to hoping this is a relative path.
+    scriptName = path.join(dir, src);
+  }
+  if (scriptName && fs.existsSync(scriptName)) {
+    return module.exports.getGlobalsForFile(scriptName, {
+      ecmaVersion: helpers.getECMAVersion(),
+      sourceType: type,
+    });
+  }
+  return [];
+}
+
+/**
+ * An object that returns found globals for given AST node types. Each prototype
+ * property should be named for a node type and accepts a node parameter and a
+ * parents parameter which is a list of the parent nodes of the current node.
+ * Each returns an array of globals found.
+ *
+ * @param  {String} filePath
+ *         The absolute path of the file being parsed.
+ */
+function GlobalsForNode(filePath, context) {
+  this.path = filePath;
+  this.context = context;
+
+  if (this.path) {
+    this.dirname = path.dirname(this.path);
+  } else {
+    this.dirname = null;
+  }
+}
+
+GlobalsForNode.prototype = {
+  Program(node) {
+    let globals = [];
+    for (let comment of node.comments) {
+      if (comment.type !== "Block") {
+        continue;
+      }
+      let value = comment.value.trim();
+      value = value.replace(/\n/g, "");
+
+      // We have to discover any globals that ESLint would have defined through
+      // comment directives.
+      let match = /^globals?\s+(.+)/.exec(value);
+      if (match) {
+        let values = parseBooleanConfig(match[1].trim(), node);
+        for (let name of Object.keys(values)) {
+          globals.push({
+            name,
+            writable: values[name].value,
+          });
+        }
+        // We matched globals, so we won't match import-globals-from.
+        continue;
+      }
+
+      match = /^import-globals-from\s+(.+)$/.exec(value);
+      if (!match) {
+        continue;
+      }
+
+      if (!this.dirname) {
+        // If this is testing context without path, ignore import.
+        return globals;
+      }
+
+      let filePath = match[1].trim();
+
+      if (filePath.endsWith(".mjs")) {
+        if (this.context) {
+          this.context.report(
+            comment,
+            "import-globals-from does not support module files - use a direct import instead"
+          );
+        } else {
+          // Fall back to throwing an error, as we do not have a context in all situations,
+          // e.g. when loading the environment.
+          throw new Error(
+            "import-globals-from does not support module files - use a direct import instead"
+          );
+        }
+        continue;
+      }
+
+      if (!path.isAbsolute(filePath)) {
+        filePath = path.resolve(this.dirname, filePath);
+      } else {
+        filePath = path.join(helpers.rootDir, filePath);
+      }
+      globals = globals.concat(module.exports.getGlobalsForFile(filePath));
+    }
+
+    return globals;
+  },
+
+  ExpressionStatement(node, parents, globalScope) {
+    let isGlobal = helpers.getIsGlobalThis(parents);
+    let globals = [];
+
+    // Note: We check the expression types here and only call the necessary
+    // functions to aid performance.
+    if (node.expression.type === "AssignmentExpression") {
+      globals = convertThisAssignmentExpressionToGlobals(node, isGlobal);
+    } else if (node.expression.type === "CallExpression") {
+      globals = convertCallExpressionToGlobals(node, isGlobal);
+    }
+
+    // Here we assume that if importScripts is set in the global scope, then
+    // this is a worker. It would be nice if eslint gave us a way of getting
+    // the environment directly.
+    //
+    // If this is testing context without path, ignore import.
+    if (globalScope && globalScope.set.get("importScripts") && this.dirname) {
+      let workerDetails = convertWorkerExpressionToGlobals(
+        node,
+        isGlobal,
+        this.dirname
+      );
+      globals = globals.concat(workerDetails);
+    }
+
+    return globals;
+  },
+};
+
+module.exports = {
+  /**
+   * Returns all globals for a given file. Recursively searches through
+   * import-globals-from directives and also includes globals defined by
+   * standard eslint directives.
+   *
+   * @param  {String} filePath
+   *         The absolute path of the file to be parsed.
+   * @param  {Object} astOptions
+   *         Extra options to pass to the parser.
+   * @return {Array}
+   *         An array of objects that contain details about the globals:
+   *         - {String} name
+   *                    The name of the global.
+   *         - {Boolean} writable
+   *                     If the global is writeable or not.
+   */
+  getGlobalsForFile(filePath, astOptions = {}) {
+    if (globalCache.has(filePath)) {
+      return globalCache.get(filePath);
+    }
+
+    if (globalDiscoveryInProgressForFiles.has(filePath)) {
+      // We're already processing this file, so return an empty set for now -
+      // the initial processing will pick up on the globals for this file.
+      return [];
+    }
+    globalDiscoveryInProgressForFiles.add(filePath);
+
+    let content = fs.readFileSync(filePath, "utf8");
+
+    // Parse the content into an AST
+    let { ast, scopeManager, visitorKeys } = helpers.parseCode(
+      content,
+      astOptions
+    );
+
+    // Discover global declarations
+    let globalScope = scopeManager.acquire(ast);
+
+    let globals = Object.keys(globalScope.variables).map(v => ({
+      name: globalScope.variables[v].name,
+      writable: true,
+    }));
+
+    // Walk over the AST to find any of our custom globals
+    let handler = new GlobalsForNode(filePath);
+
+    helpers.walkAST(ast, visitorKeys, (type, node, parents) => {
+      if (type in handler) {
+        let newGlobals = handler[type](node, parents, globalScope);
+        globals.push.apply(globals, newGlobals);
+      }
+    });
+
+    globalCache.set(filePath, globals);
+
+    globalDiscoveryInProgressForFiles.delete(filePath);
+    return globals;
+  },
+
+  /**
+   * Returns all globals for a code.
+   * This is only for testing.
+   *
+   * @param  {String} code
+   *         The JS code
+   * @param  {Object} astOptions
+   *         Extra options to pass to the parser.
+   * @return {Array}
+   *         An array of objects that contain details about the globals:
+   *         - {String} name
+   *                    The name of the global.
+   *         - {Boolean} writable
+   *                     If the global is writeable or not.
+   */
+  getGlobalsForCode(code, astOptions = {}) {
+    // Parse the content into an AST
+    let { ast, scopeManager, visitorKeys } = helpers.parseCode(
+      code,
+      astOptions,
+      { useBabel: false }
+    );
+
+    // Discover global declarations
+    let globalScope = scopeManager.acquire(ast);
+
+    let globals = Object.keys(globalScope.variables).map(v => ({
+      name: globalScope.variables[v].name,
+      writable: true,
+    }));
+
+    // Walk over the AST to find any of our custom globals
+    let handler = new GlobalsForNode(null);
+
+    helpers.walkAST(ast, visitorKeys, (type, node, parents) => {
+      if (type in handler) {
+        let newGlobals = handler[type](node, parents, globalScope);
+        globals.push.apply(globals, newGlobals);
+      }
+    });
+
+    return globals;
+  },
+
+  /**
+   * Returns all the globals for an html file that are defined by imported
+   * scripts (i.e. <script src="foo.js">).
+   *
+   * This function will cache results for one html file only - we expect
+   * this to be called sequentially for each chunk of a HTML file, rather
+   * than chucks of different files in random order.
+   *
+   * @param  {String} filePath
+   *         The absolute path of the file to be parsed.
+   * @return {Array}
+   *         An array of objects that contain details about the globals:
+   *         - {String} name
+   *                    The name of the global.
+   *         - {Boolean} writable
+   *                     If the global is writeable or not.
+   */
+  getImportedGlobalsForHTMLFile(filePath) {
+    if (lastHTMLGlobals.filename === filePath) {
+      return lastHTMLGlobals.globals;
+    }
+
+    let dir = path.dirname(filePath);
+    let globals = [];
+
+    let content = fs.readFileSync(filePath, "utf8");
+    let scriptSrcs = [];
+
+    // We use htmlparser as this ensures we find the script tags correctly.
+    let parser = new htmlparser.Parser(
+      {
+        onopentag(name, attribs) {
+          if (name === "script" && "src" in attribs) {
+            scriptSrcs.push({
+              src: attribs.src,
+              type:
+                "type" in attribs && attribs.type == "module"
+                  ? "module"
+                  : "script",
+            });
+          }
+        },
+      },
+      {
+        xmlMode: filePath.endsWith("xhtml"),
+      }
+    );
+
+    parser.parseComplete(content);
+
+    for (let script of scriptSrcs) {
+      // Ensure that the script src isn't just "".
+      if (!script.src) {
+        continue;
+      }
+      globals.push(...getGlobalsForScript(script.src, script.type, dir));
+    }
+
+    lastHTMLGlobals.filePath = filePath;
+    return (lastHTMLGlobals.globals = globals);
+  },
+
+  /**
+   * Intended to be used as-is for an ESLint rule that parses for globals in
+   * the current file and recurses through import-globals-from directives.
+   *
+   * @param  {Object} context
+   *         The ESLint parsing context.
+   */
+  getESLintGlobalParser(context) {
+    let globalScope;
+
+    let parser = {
+      Program(node) {
+        globalScope = context.getScope();
+      },
+    };
+    let filename = context.getFilename();
+
+    let extraHTMLGlobals = [];
+    if (filename.endsWith(".html") || filename.endsWith(".xhtml")) {
+      extraHTMLGlobals = module.exports.getImportedGlobalsForHTMLFile(filename);
+    }
+
+    // Install thin wrappers around GlobalsForNode
+    let handler = new GlobalsForNode(helpers.getAbsoluteFilePath(context));
+
+    for (let type of Object.keys(GlobalsForNode.prototype)) {
+      parser[type] = function (node) {
+        if (type === "Program") {
+          globalScope = context.getScope();
+          helpers.addGlobals(extraHTMLGlobals, globalScope);
+        }
+        let globals = handler[type](node, context.getAncestors(), globalScope);
+        helpers.addGlobals(
+          globals,
+          globalScope,
+          node.type !== "Program" && node
+        );
+      };
+    }
+
+    return parser;
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/helpers.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/helpers.js
new file mode 100644
index 0000000000..640d3bf1a0
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/helpers.js
@@ -0,0 +1,805 @@
+/**
+ * @fileoverview A collection of helper functions.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+"use strict";
+
+const parser = require("@babel/eslint-parser");
+const { analyze } = require("eslint-scope");
+const { KEYS: defaultVisitorKeys } = require("eslint-visitor-keys");
+const estraverse = require("estraverse");
+const path = require("path");
+const fs = require("fs");
+const ini = require("multi-ini");
+const recommendedConfig = require("./configs/recommended");
+
+var gRootDir = null;
+var directoryManifests = new Map();
+
+let xpidlData;
+
+module.exports = {
+  get iniParser() {
+    if (!this._iniParser) {
+      this._iniParser = new ini.Parser();
+    }
+    return this._iniParser;
+  },
+
+  get servicesData() {
+    return require("./services.json");
+  },
+
+  /**
+   * Obtains xpidl data from the object directory specified in the
+   * environment.
+   *
+   * @returns {Map<string, object>}
+   *   A map of interface names to the interface details.
+   */
+  get xpidlData() {
+    let xpidlDir;
+
+    if (process.env.TASK_ID && !process.env.MOZ_XPT_ARTIFACTS_DIR) {
+      throw new Error(
+        "MOZ_XPT_ARTIFACTS_DIR must be set for this rule in automation"
+      );
+    }
+    xpidlDir = process.env.MOZ_XPT_ARTIFACTS_DIR;
+
+    if (!xpidlDir && process.env.MOZ_OBJDIR) {
+      xpidlDir = `${process.env.MOZ_OBJDIR}/dist/xpt_artifacts/`;
+      if (!fs.existsSync(xpidlDir)) {
+        xpidlDir = `${process.env.MOZ_OBJDIR}/config/makefiles/xpidl/`;
+      }
+    }
+    if (!xpidlDir) {
+      throw new Error(
+        "MOZ_OBJDIR must be defined in the environment for this rule, i.e. MOZ_OBJDIR=objdir-ff ./mach ..."
+      );
+    }
+    if (xpidlData) {
+      return xpidlData;
+    }
+    let files = fs.readdirSync(`${xpidlDir}`);
+    // `Makefile` is an expected file in the directory.
+    if (files.length <= 1) {
+      throw new Error("Missing xpidl data files, maybe you need to build?");
+    }
+    xpidlData = new Map();
+    for (let file of files) {
+      if (!file.endsWith(".xpt")) {
+        continue;
+      }
+      let data = JSON.parse(fs.readFileSync(path.join(`${xpidlDir}`, file)));
+      for (let details of data) {
+        xpidlData.set(details.name, details);
+      }
+    }
+    return xpidlData;
+  },
+
+  /**
+   * Gets the abstract syntax tree (AST) of the JavaScript source code contained
+   * in sourceText. This matches the results for an eslint parser, see
+   * https://eslint.org/docs/developer-guide/working-with-custom-parsers.
+   *
+   * @param  {String} sourceText
+   *         Text containing valid JavaScript.
+   * @param  {Object} astOptions
+   *         Extra configuration to pass to the espree parser, these will override
+   *         the configuration from getPermissiveConfig().
+   * @param  {Object} configOptions
+   *         Extra options for getPermissiveConfig().
+   *
+   * @return {Object}
+   *         Returns an object containing `ast`, `scopeManager` and
+   *         `visitorKeys`
+   */
+  parseCode(sourceText, astOptions = {}, configOptions = {}) {
+    // Use a permissive config file to allow parsing of anything that Espree
+    // can parse.
+    let config = { ...this.getPermissiveConfig(configOptions), ...astOptions };
+
+    let parseResult =
+      "parseForESLint" in parser
+        ? parser.parseForESLint(sourceText, config)
+        : { ast: parser.parse(sourceText, config) };
+
+    let visitorKeys = parseResult.visitorKeys || defaultVisitorKeys;
+    visitorKeys.ExperimentalRestProperty = visitorKeys.RestElement;
+    visitorKeys.ExperimentalSpreadProperty = visitorKeys.SpreadElement;
+
+    return {
+      ast: parseResult.ast,
+      scopeManager: parseResult.scopeManager || analyze(parseResult.ast),
+      visitorKeys,
+    };
+  },
+
+  /**
+   * A simplistic conversion of some AST nodes to a standard string form.
+   *
+   * @param  {Object} node
+   *         The AST node to convert.
+   *
+   * @return {String}
+   *         The JS source for the node.
+   */
+  getASTSource(node, context) {
+    switch (node.type) {
+      case "MemberExpression":
+        if (node.computed) {
+          let filename = context && context.getFilename();
+          throw new Error(
+            `getASTSource unsupported computed MemberExpression in ${filename}`
+          );
+        }
+        return (
+          this.getASTSource(node.object) +
+          "." +
+          this.getASTSource(node.property)
+        );
+      case "ThisExpression":
+        return "this";
+      case "Identifier":
+        return node.name;
+      case "Literal":
+        return JSON.stringify(node.value);
+      case "CallExpression":
+        var args = node.arguments.map(a => this.getASTSource(a)).join(", ");
+        return this.getASTSource(node.callee) + "(" + args + ")";
+      case "ObjectExpression":
+        return "{}";
+      case "ExpressionStatement":
+        return this.getASTSource(node.expression) + ";";
+      case "FunctionExpression":
+        return "function() {}";
+      case "ArrayExpression":
+        return "[" + node.elements.map(this.getASTSource, this).join(",") + "]";
+      case "ArrowFunctionExpression":
+        return "() => {}";
+      case "AssignmentExpression":
+        return (
+          this.getASTSource(node.left) + " = " + this.getASTSource(node.right)
+        );
+      case "BinaryExpression":
+        return (
+          this.getASTSource(node.left) +
+          " " +
+          node.operator +
+          " " +
+          this.getASTSource(node.right)
+        );
+      case "UnaryExpression":
+        return node.operator + " " + this.getASTSource(node.argument);
+      default:
+        throw new Error("getASTSource unsupported node type: " + node.type);
+    }
+  },
+
+  /**
+   * This walks an AST in a manner similar to ESLint passing node events to the
+   * listener. The listener is expected to be a simple function
+   * which accepts node type, node and parents arguments.
+   *
+   * @param  {Object} ast
+   *         The AST to walk.
+   * @param  {Array} visitorKeys
+   *         The visitor keys to use for the AST.
+   * @param  {Function} listener
+   *         A callback function to call for the nodes. Passed three arguments,
+   *         event type, node and an array of parent nodes for the current node.
+   */
+  walkAST(ast, visitorKeys, listener) {
+    let parents = [];
+
+    estraverse.traverse(ast, {
+      enter(node, parent) {
+        listener(node.type, node, parents);
+
+        parents.push(node);
+      },
+
+      leave(node, parent) {
+        if (!parents.length) {
+          throw new Error("Left more nodes than entered.");
+        }
+        parents.pop();
+      },
+
+      keys: visitorKeys,
+    });
+    if (parents.length) {
+      throw new Error("Entered more nodes than left.");
+    }
+  },
+
+  /**
+   * Add a variable to the current scope.
+   * HACK: This relies on eslint internals so it could break at any time.
+   *
+   * @param {String} name
+   *        The variable name to add to the scope.
+   * @param {ASTScope} scope
+   *        The scope to add to.
+   * @param {boolean} writable
+   *        Whether the global can be overwritten.
+   * @param {Object} [node]
+   *        The AST node that defined the globals.
+   */
+  addVarToScope(name, scope, writable, node) {
+    scope.__defineGeneric(name, scope.set, scope.variables, null, null);
+
+    let variable = scope.set.get(name);
+    variable.eslintExplicitGlobal = false;
+    variable.writeable = writable;
+    if (node) {
+      variable.defs.push({
+        type: "Variable",
+        node,
+        name: { name, parent: node.parent },
+      });
+      variable.identifiers.push(node);
+    }
+
+    // Walk to the global scope which holds all undeclared variables.
+    while (scope.type != "global") {
+      scope = scope.upper;
+    }
+
+    // "through" contains all references with no found definition.
+    scope.through = scope.through.filter(function (reference) {
+      if (reference.identifier.name != name) {
+        return true;
+      }
+
+      // Links the variable and the reference.
+      // And this reference is removed from `Scope#through`.
+      reference.resolved = variable;
+      variable.references.push(reference);
+      return false;
+    });
+  },
+
+  /**
+   * Adds a set of globals to a scope.
+   *
+   * @param {Array} globalVars
+   *        An array of global variable names.
+   * @param {ASTScope} scope
+   *        The scope.
+   * @param {Object} [node]
+   *        The AST node that defined the globals.
+   */
+  addGlobals(globalVars, scope, node) {
+    globalVars.forEach(v =>
+      this.addVarToScope(v.name, scope, v.writable, v.explicit && node)
+    );
+  },
+
+  /**
+   * To allow espree to parse almost any JavaScript we need as many features as
+   * possible turned on. This method returns that config.
+   *
+   * @param {Object} options
+   *        {
+   *          useBabel: {boolean} whether to set babelOptions.
+   *        }
+   * @return {Object}
+   *         Espree compatible permissive config.
+   */
+  getPermissiveConfig({ useBabel = true } = {}) {
+    const config = {
+      range: true,
+      requireConfigFile: false,
+      babelOptions: {
+        // configFile: path.join(gRootDir, ".babel-eslint.rc.js"),
+        // parserOpts: {
+        //   plugins: [
+        //     "@babel/plugin-proposal-class-static-block",
+        //     "@babel/plugin-syntax-class-properties",
+        //     "@babel/plugin-syntax-jsx",
+        //   ],
+        // },
+      },
+      loc: true,
+      comment: true,
+      attachComment: true,
+      ecmaVersion: this.getECMAVersion(),
+      sourceType: "script",
+    };
+
+    if (useBabel && this.isMozillaCentralBased()) {
+      config.babelOptions.configFile = path.join(
+        gRootDir,
+        ".babel-eslint.rc.js"
+      );
+    }
+    return config;
+  },
+
+  /**
+   * Returns the ECMA version of the recommended config.
+   *
+   * @return {Number} The ECMA version of the recommended config.
+   */
+  getECMAVersion() {
+    return recommendedConfig.parserOptions.ecmaVersion;
+  },
+
+  /**
+   * Check whether it's inside top-level script.
+   *
+   * @param {Array} ancestors
+   *        The parents of the current node.
+   *
+   * @return {Boolean}
+   *         True or false
+   */
+  getIsTopLevelScript(ancestors) {
+    for (let parent of ancestors) {
+      switch (parent.type) {
+        case "ArrowFunctionExpression":
+        case "FunctionDeclaration":
+        case "FunctionExpression":
+        case "PropertyDefinition":
+        case "StaticBlock":
+          return false;
+      }
+    }
+    return true;
+  },
+
+  isTopLevel(ancestors) {
+    for (let parent of ancestors) {
+      switch (parent.type) {
+        case "ArrowFunctionExpression":
+        case "FunctionDeclaration":
+        case "FunctionExpression":
+        case "PropertyDefinition":
+        case "StaticBlock":
+        case "BlockStatement":
+          return false;
+      }
+    }
+    return true;
+  },
+
+  /**
+   * Check whether `this` expression points the global this.
+   *
+   * @param {Array} ancestors
+   *        The parents of the current node.
+   *
+   * @return {Boolean}
+   *         True or false
+   */
+  getIsGlobalThis(ancestors) {
+    for (let parent of ancestors) {
+      switch (parent.type) {
+        case "FunctionDeclaration":
+        case "FunctionExpression":
+        case "PropertyDefinition":
+        case "StaticBlock":
+          return false;
+      }
+    }
+    return true;
+  },
+
+  /**
+   * Check whether the node is evaluated at top-level script unconditionally.
+   *
+   * @param {Array} ancestors
+   *        The parents of the current node.
+   *
+   * @return {Boolean}
+   *         True or false
+   */
+  getIsTopLevelAndUnconditionallyExecuted(ancestors) {
+    for (let parent of ancestors) {
+      switch (parent.type) {
+        // Control flow
+        case "IfStatement":
+        case "SwitchStatement":
+        case "TryStatement":
+        case "WhileStatement":
+        case "DoWhileStatement":
+        case "ForStatement":
+        case "ForInStatement":
+        case "ForOfStatement":
+          return false;
+
+        // Function
+        case "FunctionDeclaration":
+        case "FunctionExpression":
+        case "ArrowFunctionExpression":
+        case "ClassBody":
+          return false;
+
+        // Branch
+        case "LogicalExpression":
+        case "ConditionalExpression":
+        case "ChainExpression":
+          return false;
+
+        case "AssignmentExpression":
+          switch (parent.operator) {
+            // Branch
+            case "||=":
+            case "&&=":
+            case "??=":
+              return false;
+          }
+          break;
+
+        // Implicit branch (default value)
+        case "ObjectPattern":
+        case "ArrayPattern":
+          return false;
+      }
+    }
+    return true;
+  },
+
+  /**
+   * Check whether we might be in a test head file.
+   *
+   * @param  {RuleContext} scope
+   *         You should pass this from within a rule
+   *         e.g. helpers.getIsHeadFile(context)
+   *
+   * @return {Boolean}
+   *         True or false
+   */
+  getIsHeadFile(scope) {
+    var pathAndFilename = this.cleanUpPath(scope.getFilename());
+
+    return /.*[\\/]head(_.+)?\.js$/.test(pathAndFilename);
+  },
+
+  /**
+   * Gets the head files for a potential test file
+   *
+   * @param  {RuleContext} scope
+   *         You should pass this from within a rule
+   *         e.g. helpers.getIsHeadFile(context)
+   *
+   * @return {String[]}
+   *         Paths to head files to load for the test
+   */
+  getTestHeadFiles(scope) {
+    if (!this.getIsTest(scope)) {
+      return [];
+    }
+
+    let filepath = this.cleanUpPath(scope.getFilename());
+    let dir = path.dirname(filepath);
+
+    let names = fs
+      .readdirSync(dir)
+      .filter(
+        name =>
+          (name.startsWith("head") || name.startsWith("xpcshell-head")) &&
+          name.endsWith(".js")
+      )
+      .map(name => path.join(dir, name));
+    return names;
+  },
+
+  /**
+   * Gets all the test manifest data for a directory
+   *
+   * @param  {String} dir
+   *         The directory
+   *
+   * @return {Array}
+   *         An array of objects with file and manifest properties
+   */
+  getManifestsForDirectory(dir) {
+    if (directoryManifests.has(dir)) {
+      return directoryManifests.get(dir);
+    }
+
+    let manifests = [];
+    let names = [];
+    try {
+      names = fs.readdirSync(dir);
+    } catch (err) {
+      // Ignore directory not found, it might be faked by a test
+      if (err.code !== "ENOENT") {
+        throw err;
+      }
+    }
+
+    for (let name of names) {
+      if (!name.endsWith(".ini")) {
+        continue;
+      }
+
+      try {
+        let manifest = this.iniParser.parse(
+          fs.readFileSync(path.join(dir, name), "utf8").split("\n")
+        );
+        manifests.push({
+          file: path.join(dir, name),
+          manifest,
+        });
+      } catch (e) {}
+    }
+
+    directoryManifests.set(dir, manifests);
+    return manifests;
+  },
+
+  /**
+   * Gets the manifest file a test is listed in
+   *
+   * @param  {RuleContext} scope
+   *         You should pass this from within a rule
+   *         e.g. helpers.getIsHeadFile(context)
+   *
+   * @return {String}
+   *         The path to the test manifest file
+   */
+  getTestManifest(scope) {
+    let filepath = this.cleanUpPath(scope.getFilename());
+
+    let dir = path.dirname(filepath);
+    let filename = path.basename(filepath);
+
+    for (let manifest of this.getManifestsForDirectory(dir)) {
+      if (filename in manifest.manifest) {
+        return manifest.file;
+      }
+    }
+
+    return null;
+  },
+
+  /**
+   * Check whether we are in a test of some kind.
+   *
+   * @param  {RuleContext} scope
+   *         You should pass this from within a rule
+   *         e.g. helpers.getIsTest(context)
+   *
+   * @return {Boolean}
+   *         True or false
+   */
+  getIsTest(scope) {
+    // Regardless of the manifest name being in a manifest means we're a test.
+    let manifest = this.getTestManifest(scope);
+    if (manifest) {
+      return true;
+    }
+
+    return !!this.getTestType(scope);
+  },
+
+  /*
+   * Check if this is an .sjs file.
+   */
+  getIsSjs(scope) {
+    let filepath = this.cleanUpPath(scope.getFilename());
+
+    return path.extname(filepath) == ".sjs";
+  },
+
+  /**
+   * Gets the type of test or null if this isn't a test.
+   *
+   * @param  {RuleContext} scope
+   *         You should pass this from within a rule
+   *         e.g. helpers.getIsHeadFile(context)
+   *
+   * @return {String or null}
+   *         Test type: xpcshell, browser, chrome, mochitest
+   */
+  getTestType(scope) {
+    let testTypes = ["browser", "xpcshell", "chrome", "mochitest", "a11y"];
+    let manifest = this.getTestManifest(scope);
+    if (manifest) {
+      let name = path.basename(manifest);
+      for (let testType of testTypes) {
+        if (name.startsWith(testType)) {
+          return testType;
+        }
+      }
+    }
+
+    let filepath = this.cleanUpPath(scope.getFilename());
+    let filename = path.basename(filepath);
+
+    if (filename.startsWith("browser_")) {
+      return "browser";
+    }
+
+    if (filename.startsWith("test_")) {
+      let parent = path.basename(path.dirname(filepath));
+      for (let testType of testTypes) {
+        if (parent.startsWith(testType)) {
+          return testType;
+        }
+      }
+
+      // It likely is a test, we're just not sure what kind.
+      return "unknown";
+    }
+
+    // Likely not a test
+    return null;
+  },
+
+  getIsWorker(filePath) {
+    let filename = path.basename(this.cleanUpPath(filePath)).toLowerCase();
+
+    return filename.includes("worker");
+  },
+
+  /**
+   * Gets the root directory of the repository by walking up directories from
+   * this file until a .eslintignore file is found. If this fails, the same
+   * procedure will be attempted from the current working dir.
+   * @return {String} The absolute path of the repository directory
+   */
+  get rootDir() {
+    if (!gRootDir) {
+      function searchUpForIgnore(dirName, filename) {
+        let parsed = path.parse(dirName);
+        while (parsed.root !== dirName) {
+          if (fs.existsSync(path.join(dirName, filename))) {
+            return dirName;
+          }
+          // Move up a level
+          dirName = parsed.dir;
+          parsed = path.parse(dirName);
+        }
+        return null;
+      }
+
+      let possibleRoot = searchUpForIgnore(
+        path.dirname(module.filename),
+        ".eslintignore"
+      );
+      if (!possibleRoot) {
+        possibleRoot = searchUpForIgnore(path.resolve(), ".eslintignore");
+      }
+      if (!possibleRoot) {
+        possibleRoot = searchUpForIgnore(path.resolve(), "package.json");
+      }
+      if (!possibleRoot) {
+        // We've couldn't find a root from the module or CWD, so lets just go
+        // for the CWD. We really don't want to throw if possible, as that
+        // tends to give confusing results when used with ESLint.
+        possibleRoot = process.cwd();
+      }
+
+      gRootDir = possibleRoot;
+    }
+
+    return gRootDir;
+  },
+
+  /**
+   * ESLint may be executed from various places: from mach, at the root of the
+   * repository, or from a directory in the repository when, for instance,
+   * executed by a text editor's plugin.
+   * The value returned by context.getFileName() varies because of this.
+   * This helper function makes sure to return an absolute file path for the
+   * current context, by looking at process.cwd().
+   * @param {Context} context
+   * @return {String} The absolute path
+   */
+  getAbsoluteFilePath(context) {
+    var fileName = this.cleanUpPath(context.getFilename());
+    var cwd = process.cwd();
+
+    if (path.isAbsolute(fileName)) {
+      // Case 2: executed from the repo's root with mach:
+      //   fileName: /path/to/mozilla/repo/a/b/c/d.js
+      //   cwd: /path/to/mozilla/repo
+      return fileName;
+    } else if (path.basename(fileName) == fileName) {
+      // Case 1b: executed from a nested directory, fileName is the base name
+      // without any path info (happens in Atom with linter-eslint)
+      return path.join(cwd, fileName);
+    }
+    // Case 1: executed form in a nested directory, e.g. from a text editor:
+    //   fileName: a/b/c/d.js
+    //   cwd: /path/to/mozilla/repo/a/b/c
+    var dirName = path.dirname(fileName);
+    return cwd.slice(0, cwd.length - dirName.length) + fileName;
+  },
+
+  /**
+   * When ESLint is run from SublimeText, paths retrieved from
+   * context.getFileName contain leading and trailing double-quote characters.
+   * These characters need to be removed.
+   */
+  cleanUpPath(pathName) {
+    return pathName.replace(/^"/, "").replace(/"$/, "");
+  },
+
+  get globalScriptPaths() {
+    return [
+      path.join(this.rootDir, "browser", "base", "content", "browser.xhtml"),
+      path.join(
+        this.rootDir,
+        "browser",
+        "base",
+        "content",
+        "global-scripts.inc"
+      ),
+    ];
+  },
+
+  isMozillaCentralBased() {
+    return fs.existsSync(this.globalScriptPaths[0]);
+  },
+
+  getSavedEnvironmentItems(environment) {
+    return require("./environments/saved-globals.json").environments[
+      environment
+    ];
+  },
+
+  getSavedRuleData(rule) {
+    return require("./rules/saved-rules-data.json").rulesData[rule];
+  },
+
+  getBuildEnvironment() {
+    var { execFileSync } = require("child_process");
+    var output = execFileSync(
+      path.join(this.rootDir, "mach"),
+      ["environment", "--format=json"],
+      { silent: true }
+    );
+    return JSON.parse(output);
+  },
+
+  /**
+   * Extract the path of require (and require-like) helpers used in DevTools.
+   */
+  getDevToolsRequirePath(node) {
+    if (
+      node.callee.type == "Identifier" &&
+      node.callee.name == "require" &&
+      node.arguments.length == 1 &&
+      node.arguments[0].type == "Literal"
+    ) {
+      return node.arguments[0].value;
+    } else if (
+      node.callee.type == "MemberExpression" &&
+      node.callee.property.type == "Identifier" &&
+      node.callee.property.name == "lazyRequireGetter" &&
+      node.arguments.length >= 3 &&
+      node.arguments[2].type == "Literal"
+    ) {
+      return node.arguments[2].value;
+    }
+    return null;
+  },
+
+  /**
+   * Returns property name from MemberExpression. Also accepts Identifier for consistency.
+   * @param {import("estree").MemberExpression | import("estree").Identifier} node
+   * @returns {string | null}
+   *
+   * @example `foo` gives "foo"
+   * @example `foo.bar` gives "bar"
+   * @example `foo.bar.baz` gives "baz"
+   */
+  maybeGetMemberPropertyName(node) {
+    if (node.type === "MemberExpression") {
+      return node.property.name;
+    }
+    if (node.type === "Identifier") {
+      return node.name;
+    }
+    return null;
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/index.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/index.js
new file mode 100644
index 0000000000..aad6d8bbbd
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/index.js
@@ -0,0 +1,96 @@
+/**
+ * @fileoverview A collection of rules that help enforce JavaScript coding
+ * standard and avoid common errors in the Mozilla project.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Plugin Definition
+// ------------------------------------------------------------------------------
+module.exports = {
+  configs: {
+    "browser-test": require("../lib/configs/browser-test"),
+    "chrome-test": require("../lib/configs/chrome-test"),
+    "mochitest-test": require("../lib/configs/mochitest-test"),
+    recommended: require("../lib/configs/recommended"),
+    "require-jsdoc": require("../lib/configs/require-jsdoc"),
+    "valid-jsdoc": require("../lib/configs/valid-jsdoc"),
+    "xpcshell-test": require("../lib/configs/xpcshell-test"),
+  },
+  environments: {
+    "browser-window": require("../lib/environments/browser-window.js"),
+    "chrome-script": require("../lib/environments/chrome-script.js"),
+    "chrome-worker": require("../lib/environments/chrome-worker.js"),
+    "frame-script": require("../lib/environments/frame-script.js"),
+    jsm: require("../lib/environments/jsm.js"),
+    "process-script": require("../lib/environments/process-script.js"),
+    "remote-page": require("../lib/environments/remote-page.js"),
+    simpletest: require("../lib/environments/simpletest.js"),
+    sjs: require("../lib/environments/sjs.js"),
+    "special-powers-sandbox": require("../lib/environments/special-powers-sandbox.js"),
+    specific: require("../lib/environments/specific"),
+    privileged: require("../lib/environments/privileged.js"),
+    xpcshell: require("../lib/environments/xpcshell.js"),
+  },
+  rules: {
+    "avoid-Date-timing": require("../lib/rules/avoid-Date-timing"),
+    "avoid-removeChild": require("../lib/rules/avoid-removeChild"),
+    "balanced-listeners": require("../lib/rules/balanced-listeners"),
+    "balanced-observers": require("../lib/rules/balanced-observers"),
+    "consistent-if-bracing": require("../lib/rules/consistent-if-bracing"),
+    "import-browser-window-globals": require("../lib/rules/import-browser-window-globals"),
+    "import-content-task-globals": require("../lib/rules/import-content-task-globals"),
+    "import-globals": require("../lib/rules/import-globals"),
+    "import-headjs-globals": require("../lib/rules/import-headjs-globals"),
+    "lazy-getter-object-name": require("../lib/rules/lazy-getter-object-name"),
+    "mark-exported-symbols-as-used": require("../lib/rules/mark-exported-symbols-as-used"),
+    "mark-test-function-used": require("../lib/rules/mark-test-function-used"),
+    "no-aArgs": require("../lib/rules/no-aArgs"),
+    "no-addtask-setup": require("../lib/rules/no-addtask-setup"),
+    "no-arbitrary-setTimeout": require("../lib/rules/no-arbitrary-setTimeout"),
+    "no-compare-against-boolean-literals": require("../lib/rules/no-compare-against-boolean-literals"),
+    "no-cu-reportError": require("../lib/rules/no-cu-reportError"),
+    "no-define-cc-etc": require("../lib/rules/no-define-cc-etc"),
+    "no-redeclare-with-import-autofix": require("../lib/rules/no-redeclare-with-import-autofix"),
+    "no-throw-cr-literal": require("../lib/rules/no-throw-cr-literal"),
+    "no-useless-parameters": require("../lib/rules/no-useless-parameters"),
+    "no-useless-removeEventListener": require("../lib/rules/no-useless-removeEventListener"),
+    "no-useless-run-test": require("../lib/rules/no-useless-run-test"),
+    "prefer-boolean-length-check": require("../lib/rules/prefer-boolean-length-check"),
+    "prefer-formatValues": require("../lib/rules/prefer-formatValues"),
+    "reject-addtask-only": require("../lib/rules/reject-addtask-only"),
+    "reject-chromeutils-import-params": require("../lib/rules/reject-chromeutils-import-params"),
+    "reject-eager-module-in-lazy-getter": require("../lib/rules/reject-eager-module-in-lazy-getter"),
+    "reject-global-this": require("../lib/rules/reject-global-this"),
+    "reject-globalThis-modification": require("../lib/rules/reject-globalThis-modification"),
+    "reject-import-system-module-from-non-system": require("../lib/rules/reject-import-system-module-from-non-system"),
+    "reject-importGlobalProperties": require("../lib/rules/reject-importGlobalProperties"),
+    "reject-lazy-imports-into-globals": require("../lib/rules/reject-lazy-imports-into-globals"),
+    "reject-mixing-eager-and-lazy": require("../lib/rules/reject-mixing-eager-and-lazy"),
+    "reject-multiple-getters-calls": require("../lib/rules/reject-multiple-getters-calls"),
+    "reject-scriptableunicodeconverter": require("../lib/rules/reject-scriptableunicodeconverter"),
+    "reject-relative-requires": require("../lib/rules/reject-relative-requires"),
+    "reject-some-requires": require("../lib/rules/reject-some-requires"),
+    "reject-top-level-await": require("../lib/rules/reject-top-level-await"),
+    "rejects-requires-await": require("../lib/rules/rejects-requires-await"),
+    "use-cc-etc": require("../lib/rules/use-cc-etc"),
+    "use-chromeutils-generateqi": require("../lib/rules/use-chromeutils-generateqi"),
+    "use-chromeutils-import": require("../lib/rules/use-chromeutils-import"),
+    "use-default-preference-values": require("../lib/rules/use-default-preference-values"),
+    "use-ownerGlobal": require("../lib/rules/use-ownerGlobal"),
+    "use-includes-instead-of-indexOf": require("../lib/rules/use-includes-instead-of-indexOf"),
+    "use-isInstance": require("./rules/use-isInstance"),
+    "use-returnValue": require("../lib/rules/use-returnValue"),
+    "use-services": require("../lib/rules/use-services"),
+    "use-static-import": require("../lib/rules/use-static-import"),
+    "valid-ci-uses": require("../lib/rules/valid-ci-uses"),
+    "valid-lazy": require("../lib/rules/valid-lazy"),
+    "valid-services": require("../lib/rules/valid-services"),
+    "valid-services-property": require("../lib/rules/valid-services-property"),
+    "var-only-at-top-level": require("../lib/rules/var-only-at-top-level"),
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/avoid-Date-timing.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/avoid-Date-timing.js
new file mode 100644
index 0000000000..ce576e9483
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/avoid-Date-timing.js
@@ -0,0 +1,61 @@
+/**
+ * @fileoverview Disallow using Date for timing in performance sensitive code
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/avoid-Date-timing.html",
+    },
+    messages: {
+      usePerfNow:
+        "use performance.now() instead of Date.now() for timing measurements",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        let callee = node.callee;
+        if (
+          callee.type !== "MemberExpression" ||
+          callee.object.type !== "Identifier" ||
+          callee.object.name !== "Date" ||
+          callee.property.type !== "Identifier" ||
+          callee.property.name !== "now"
+        ) {
+          return;
+        }
+
+        context.report({
+          node,
+          messageId: "usePerfNow",
+        });
+      },
+
+      NewExpression(node) {
+        let callee = node.callee;
+        if (
+          callee.type !== "Identifier" ||
+          callee.name !== "Date" ||
+          node.arguments.length
+        ) {
+          return;
+        }
+
+        context.report({
+          node,
+          messageId: "usePerfNow",
+        });
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/avoid-removeChild.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/avoid-removeChild.js
new file mode 100644
index 0000000000..7db4afdde1
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/avoid-removeChild.js
@@ -0,0 +1,70 @@
+/**
+ * @fileoverview Reject using element.parentNode.removeChild(element) when
+ *               element.remove() can be used instead.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var helpers = require("../helpers");
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/avoid-removeChild.html",
+    },
+    messages: {
+      useRemove:
+        "use element.remove() instead of element.parentNode.removeChild(element)",
+      useFirstChildRemove:
+        "use element.firstChild.remove() instead of element.removeChild(element.firstChild)",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        let callee = node.callee;
+        if (
+          callee.type !== "MemberExpression" ||
+          callee.property.type !== "Identifier" ||
+          callee.property.name != "removeChild" ||
+          node.arguments.length != 1
+        ) {
+          return;
+        }
+
+        if (
+          callee.object.type == "MemberExpression" &&
+          callee.object.property.type == "Identifier" &&
+          callee.object.property.name == "parentNode" &&
+          helpers.getASTSource(callee.object.object, context) ==
+            helpers.getASTSource(node.arguments[0])
+        ) {
+          context.report({
+            node,
+            messageId: "useRemove",
+          });
+        }
+
+        if (
+          node.arguments[0].type == "MemberExpression" &&
+          node.arguments[0].property.type == "Identifier" &&
+          node.arguments[0].property.name == "firstChild" &&
+          helpers.getASTSource(callee.object, context) ==
+            helpers.getASTSource(node.arguments[0].object)
+        ) {
+          context.report({
+            node,
+            messageId: "useFirstChildRemove",
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/balanced-listeners.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/balanced-listeners.js
new file mode 100644
index 0000000000..d571918909
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/balanced-listeners.js
@@ -0,0 +1,149 @@
+/**
+ * @fileoverview Check that there's a removeEventListener for each
+ * addEventListener and an off for each on.
+ * Note that for now, this rule is rather simple in that it only checks that
+ * for each event name there is both an add and remove listener. It doesn't
+ * check that these are called on the right objects or with the same callback.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/balanced-listeners.html",
+    },
+    messages: {
+      noCorresponding:
+        "No corresponding '{{functionName}}({{type}})' was found.",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    var DICTIONARY = {
+      addEventListener: "removeEventListener",
+      on: "off",
+    };
+    // Invert this dictionary to make it easy later.
+    var INVERTED_DICTIONARY = {};
+    for (var i in DICTIONARY) {
+      INVERTED_DICTIONARY[DICTIONARY[i]] = i;
+    }
+
+    // Collect the add/remove listeners in these 2 arrays.
+    var addedListeners = [];
+    var removedListeners = [];
+
+    function addAddedListener(node) {
+      var capture = false;
+      let options = node.arguments[2];
+      if (options) {
+        if (options.type == "ObjectExpression") {
+          if (
+            options.properties.some(
+              p => p.key.name == "once" && p.value.value === true
+            )
+          ) {
+            // No point in adding listeners using the 'once' option.
+            return;
+          }
+          capture = options.properties.some(
+            p => p.key.name == "capture" && p.value.value === true
+          );
+        } else {
+          capture = options.value;
+        }
+      }
+      addedListeners.push({
+        functionName: node.callee.property.name,
+        type: node.arguments[0].value,
+        node: node.callee.property,
+        useCapture: capture,
+      });
+    }
+
+    function addRemovedListener(node) {
+      var capture = false;
+      let options = node.arguments[2];
+      if (options) {
+        if (options.type == "ObjectExpression") {
+          capture = options.properties.some(
+            p => p.key.name == "capture" && p.value.value === true
+          );
+        } else {
+          capture = options.value;
+        }
+      }
+      removedListeners.push({
+        functionName: node.callee.property.name,
+        type: node.arguments[0].value,
+        useCapture: capture,
+      });
+    }
+
+    function getUnbalancedListeners() {
+      var unbalanced = [];
+
+      for (var j = 0; j < addedListeners.length; j++) {
+        if (!hasRemovedListener(addedListeners[j])) {
+          unbalanced.push(addedListeners[j]);
+        }
+      }
+      addedListeners = removedListeners = [];
+
+      return unbalanced;
+    }
+
+    function hasRemovedListener(addedListener) {
+      for (var k = 0; k < removedListeners.length; k++) {
+        var listener = removedListeners[k];
+        if (
+          DICTIONARY[addedListener.functionName] === listener.functionName &&
+          addedListener.type === listener.type &&
+          addedListener.useCapture === listener.useCapture
+        ) {
+          return true;
+        }
+      }
+
+      return false;
+    }
+
+    return {
+      CallExpression(node) {
+        if (node.arguments.length === 0) {
+          return;
+        }
+
+        if (node.callee.type === "MemberExpression") {
+          var listenerMethodName = node.callee.property.name;
+
+          if (DICTIONARY.hasOwnProperty(listenerMethodName)) {
+            addAddedListener(node);
+          } else if (INVERTED_DICTIONARY.hasOwnProperty(listenerMethodName)) {
+            addRemovedListener(node);
+          }
+        }
+      },
+
+      "Program:exit": function () {
+        getUnbalancedListeners().forEach(function (listener) {
+          context.report({
+            node: listener.node,
+            messageId: "noCorresponding",
+            data: {
+              functionName: DICTIONARY[listener.functionName],
+              type: listener.type,
+            },
+          });
+        });
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/balanced-observers.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/balanced-observers.js
new file mode 100644
index 0000000000..6003b1c08a
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/balanced-observers.js
@@ -0,0 +1,121 @@
+/**
+ * @fileoverview Check that there's a Services.(prefs|obs).removeObserver for
+ * each addObserver.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/balanced-observers.html",
+    },
+    messages: {
+      noCorresponding:
+        "No corresponding 'removeObserver(\"{{observable}}\")' was found.",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    var addedObservers = [];
+    var removedObservers = [];
+
+    function getObserverAPI(node) {
+      const object = node.callee.object;
+      if (
+        object.type == "MemberExpression" &&
+        object.property.type == "Identifier"
+      ) {
+        return object.property.name;
+      }
+      return null;
+    }
+
+    function isServicesObserver(api) {
+      return api == "obs" || api == "prefs";
+    }
+
+    function getObservableName(node, api) {
+      if (api === "obs") {
+        return node.arguments[1].value;
+      }
+      return node.arguments[0].value;
+    }
+
+    function addAddedObserver(node) {
+      const api = getObserverAPI(node);
+      if (!isServicesObserver(api)) {
+        return;
+      }
+
+      addedObservers.push({
+        functionName: node.callee.property.name,
+        observable: getObservableName(node, api),
+        node: node.callee.property,
+      });
+    }
+
+    function addRemovedObserver(node) {
+      const api = getObserverAPI(node);
+      if (!isServicesObserver(api)) {
+        return;
+      }
+
+      removedObservers.push({
+        functionName: node.callee.property.name,
+        observable: getObservableName(node, api),
+      });
+    }
+
+    function getUnbalancedObservers() {
+      const unbalanced = addedObservers.filter(
+        observer => !hasRemovedObserver(observer)
+      );
+      addedObservers = removedObservers = [];
+
+      return unbalanced;
+    }
+
+    function hasRemovedObserver(addedObserver) {
+      return removedObservers.some(
+        observer => addedObserver.observable === observer.observable
+      );
+    }
+
+    return {
+      CallExpression(node) {
+        if (node.arguments.length === 0) {
+          return;
+        }
+
+        if (node.callee.type === "MemberExpression") {
+          var methodName = node.callee.property.name;
+
+          if (methodName === "addObserver") {
+            addAddedObserver(node);
+          } else if (methodName === "removeObserver") {
+            addRemovedObserver(node);
+          }
+        }
+      },
+
+      "Program:exit": function () {
+        getUnbalancedObservers().forEach(function (observer) {
+          context.report({
+            node: observer.node,
+            messageId: "noCorresponding",
+            data: {
+              observable: observer.observable,
+            },
+          });
+        });
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/consistent-if-bracing.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/consistent-if-bracing.js
new file mode 100644
index 0000000000..6e3629833c
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/consistent-if-bracing.js
@@ -0,0 +1,54 @@
+/**
+ * @fileoverview checks if/else if/else bracing is consistent
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/consistent-if-bracing.html",
+    },
+    messages: {
+      consistentIfBracing: "Bracing of if..else bodies should be consistent.",
+    },
+    schema: [],
+    type: "layout",
+  },
+
+  create(context) {
+    return {
+      IfStatement(node) {
+        if (node.parent.type !== "IfStatement") {
+          let types = new Set();
+          for (
+            let currentNode = node;
+            currentNode;
+            currentNode = currentNode.alternate
+          ) {
+            let type = currentNode.consequent.type;
+            types.add(type == "BlockStatement" ? "Block" : "NotBlock");
+            if (
+              currentNode.alternate &&
+              currentNode.alternate.type !== "IfStatement"
+            ) {
+              type = currentNode.alternate.type;
+              types.add(type == "BlockStatement" ? "Block" : "NotBlock");
+              break;
+            }
+          }
+          if (types.size > 1) {
+            context.report({
+              node,
+              messageId: "consistentIfBracing",
+            });
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-browser-window-globals.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-browser-window-globals.js
new file mode 100644
index 0000000000..5ab19a2b0a
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-browser-window-globals.js
@@ -0,0 +1,50 @@
+/**
+ * @fileoverview For scripts included in browser-window, this will automatically
+ *               inject the browser-window global scopes into the file.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var path = require("path");
+var helpers = require("../helpers");
+var browserWindowEnv = require("../environments/browser-window");
+
+module.exports = {
+  // This rule currently has no messages.
+  // eslint-disable-next-line eslint-plugin/prefer-message-ids
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/import-browser-window-globals.html",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      Program(node) {
+        let filePath = helpers.getAbsoluteFilePath(context);
+        let relativePath = path.relative(helpers.rootDir, filePath);
+        // We need to translate the path on Windows, due to the change
+        // from \ to /, and browserjsScripts assumes Posix.
+        if (path.win32) {
+          relativePath = relativePath.split(path.sep).join("/");
+        }
+
+        if (browserWindowEnv.browserjsScripts?.includes(relativePath)) {
+          for (let global in browserWindowEnv.globals) {
+            helpers.addVarToScope(
+              global,
+              context.getScope(),
+              browserWindowEnv.globals[global]
+            );
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-content-task-globals.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-content-task-globals.js
new file mode 100644
index 0000000000..75d11bcd59
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-content-task-globals.js
@@ -0,0 +1,73 @@
+/**
+ * @fileoverview For ContentTask.spawn, this will automatically declare the
+ *               frame script variables in the global scope.
+ *               Note: due to the way ESLint works, it appears it is only
+ *               easy to declare these variables on a file-global scope, rather
+ *               than function global.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var helpers = require("../helpers");
+var frameScriptEnv = require("../environments/frame-script");
+var sandboxEnv = require("../environments/special-powers-sandbox");
+
+module.exports = {
+  // eslint-disable-next-line eslint-plugin/prefer-message-ids
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/import-content-task-globals.html",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      "CallExpression[callee.object.name='ContentTask'][callee.property.name='spawn']":
+        function (node) {
+          // testing/mochitest/BrowserTestUtils/content/content-task.js
+          // This script is loaded as a sub script into a frame script.
+          for (let [name, value] of Object.entries(frameScriptEnv.globals)) {
+            helpers.addVarToScope(name, context.getScope(), value);
+          }
+        },
+      "CallExpression[callee.object.name='SpecialPowers'][callee.property.name='spawn']":
+        function (node) {
+          for (let [name, value] of Object.entries(sandboxEnv.globals)) {
+            helpers.addVarToScope(name, context.getScope(), value);
+          }
+          let globals = [
+            // testing/specialpowers/content/SpecialPowersChild.sys.mjs
+            // SpecialPowersChild._spawnTask
+            "SpecialPowers",
+            "ContentTaskUtils",
+            "content",
+            "docShell",
+          ];
+          for (let global of globals) {
+            helpers.addVarToScope(global, context.getScope(), false);
+          }
+        },
+      "CallExpression[callee.object.name='SpecialPowers'][callee.property.name='spawnChrome']":
+        function (node) {
+          for (let [name, value] of Object.entries(sandboxEnv.globals)) {
+            helpers.addVarToScope(name, context.getScope(), value);
+          }
+          let globals = [
+            // testing/specialpowers/content/SpecialPowersParent.sys.mjs
+            // SpecialPowersParent._spawnChrome
+            "windowGlobalParent",
+            "browsingContext",
+          ];
+          for (let global of globals) {
+            helpers.addVarToScope(global, context.getScope(), false);
+          }
+        },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-globals.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-globals.js
new file mode 100644
index 0000000000..a62cf008ea
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-globals.js
@@ -0,0 +1,21 @@
+/**
+ * @fileoverview Discovers all globals for the current file.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/import-globals.html",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create: require("../globals").getESLintGlobalParser,
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-headjs-globals.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-headjs-globals.js
new file mode 100644
index 0000000000..2566b3cec0
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-headjs-globals.js
@@ -0,0 +1,51 @@
+/**
+ * @fileoverview Import globals from head.js and from any files that were
+ * imported by head.js (as far as we can correctly resolve the path).
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var fs = require("fs");
+var helpers = require("../helpers");
+var globals = require("../globals");
+
+function importHead(context, path, node) {
+  try {
+    let stats = fs.statSync(path);
+    if (!stats.isFile()) {
+      return;
+    }
+  } catch (e) {
+    return;
+  }
+
+  let newGlobals = globals.getGlobalsForFile(path);
+  helpers.addGlobals(newGlobals, context.getScope());
+}
+
+module.exports = {
+  // This rule currently has no messages.
+  // eslint-disable-next-line eslint-plugin/prefer-message-ids
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/import-headjs-globals.html",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      Program(node) {
+        let heads = helpers.getTestHeadFiles(context);
+        for (let head of heads) {
+          importHead(context, head, node);
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/lazy-getter-object-name.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/lazy-getter-object-name.js
new file mode 100644
index 0000000000..2bacac3904
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/lazy-getter-object-name.js
@@ -0,0 +1,48 @@
+/**
+ * @fileoverview Enforce the standard object name for
+ * ChromeUtils.defineESModuleGetters
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+function isIdentifier(node, id) {
+  return node.type === "Identifier" && node.name === id;
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/lazy-getter-object-name.html",
+    },
+    messages: {
+      mustUseLazy:
+        "The variable name of the object passed to ChromeUtils.defineESModuleGetters must be `lazy`",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        let { callee } = node;
+        if (
+          callee.type === "MemberExpression" &&
+          isIdentifier(callee.object, "ChromeUtils") &&
+          isIdentifier(callee.property, "defineESModuleGetters") &&
+          node.arguments.length >= 1 &&
+          !isIdentifier(node.arguments[0], "lazy")
+        ) {
+          context.report({
+            node,
+            messageId: "mustUseLazy",
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/mark-exported-symbols-as-used.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/mark-exported-symbols-as-used.js
new file mode 100644
index 0000000000..17e29e4cd1
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/mark-exported-symbols-as-used.js
@@ -0,0 +1,90 @@
+/**
+ * @fileoverview Simply marks exported symbols as used. Designed for use in
+ * .jsm files only.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+function markArrayElementsAsUsed(context, node, expression) {
+  if (expression.type != "ArrayExpression") {
+    context.report({
+      node,
+      messageId: "nonArrayAssignedToImported",
+    });
+    return;
+  }
+
+  for (let element of expression.elements) {
+    context.markVariableAsUsed(element.value);
+  }
+  // Also mark EXPORTED_SYMBOLS as used.
+  context.markVariableAsUsed("EXPORTED_SYMBOLS");
+}
+
+// Ignore assignments not in the global scope, e.g. where special module
+// definitions are required due to having different ways of importing files,
+// e.g. osfile.
+function isGlobalScope(context) {
+  return !context.getScope().upper;
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/mark-exported-symbols-as-used.html",
+    },
+    messages: {
+      useLetForExported:
+        "EXPORTED_SYMBOLS cannot be declared via `let`. Use `var` or `this.EXPORTED_SYMBOLS =`",
+      nonArrayAssignedToImported:
+        "Unexpected assignment of non-Array to EXPORTED_SYMBOLS",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      AssignmentExpression(node, parents) {
+        if (
+          node.operator === "=" &&
+          node.left.type === "MemberExpression" &&
+          node.left.object.type === "ThisExpression" &&
+          node.left.property.name === "EXPORTED_SYMBOLS" &&
+          isGlobalScope(context)
+        ) {
+          markArrayElementsAsUsed(context, node, node.right);
+        }
+      },
+
+      VariableDeclaration(node, parents) {
+        if (!isGlobalScope(context)) {
+          return;
+        }
+
+        for (let item of node.declarations) {
+          if (
+            item.id &&
+            item.id.type == "Identifier" &&
+            item.id.name === "EXPORTED_SYMBOLS"
+          ) {
+            if (node.kind === "let") {
+              // The use of 'let' isn't allowed as the lexical scope may die after
+              // the script executes.
+              context.report({
+                node,
+                messageId: "useLetForExported",
+              });
+            }
+
+            markArrayElementsAsUsed(context, node, item.init);
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/mark-test-function-used.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/mark-test-function-used.js
new file mode 100644
index 0000000000..1e7bfdc5f4
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/mark-test-function-used.js
@@ -0,0 +1,44 @@
+/**
+ * @fileoverview Simply marks `test` (the test method) or `run_test` as used
+ * when in mochitests or xpcshell tests respectively. This avoids ESLint telling
+ * us that the function is never called.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var helpers = require("../helpers");
+
+module.exports = {
+  // This rule currently has no messages.
+  // eslint-disable-next-line eslint-plugin/prefer-message-ids
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/mark-test-function-used.html",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      Program() {
+        let testType = helpers.getTestType(context);
+        if (testType == "browser") {
+          context.markVariableAsUsed("test");
+        }
+
+        if (testType == "xpcshell") {
+          context.markVariableAsUsed("run_test");
+        }
+
+        if (helpers.getIsSjs(context)) {
+          context.markVariableAsUsed("handleRequest");
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-aArgs.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-aArgs.js
new file mode 100644
index 0000000000..19a4da6472
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-aArgs.js
@@ -0,0 +1,57 @@
+/**
+ * @fileoverview warns against using hungarian notation in function arguments
+ * (i.e. aArg).
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+function isPrefixed(name) {
+  return name.length >= 2 && /^a[A-Z]/.test(name);
+}
+
+function deHungarianize(name) {
+  return name.substring(1, 2).toLowerCase() + name.substring(2, name.length);
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/no-aArgs.html",
+    },
+    messages: {
+      dontUseHungarian:
+        "Parameter '{{name}}' uses Hungarian Notation, consider using '{{suggestion}}' instead.",
+    },
+    schema: [],
+    type: "layout",
+  },
+
+  create(context) {
+    function checkFunction(node) {
+      for (var i = 0; i < node.params.length; i++) {
+        var param = node.params[i];
+        if (param.name && isPrefixed(param.name)) {
+          var errorObj = {
+            name: param.name,
+            suggestion: deHungarianize(param.name),
+          };
+          context.report({
+            node: param,
+            messageId: "dontUseHungarian",
+            data: errorObj,
+          });
+        }
+      }
+    }
+
+    return {
+      FunctionDeclaration: checkFunction,
+      ArrowFunctionExpression: checkFunction,
+      FunctionExpression: checkFunction,
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-addtask-setup.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-addtask-setup.js
new file mode 100644
index 0000000000..0289ae941d
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-addtask-setup.js
@@ -0,0 +1,57 @@
+/**
+ * @fileoverview Reject `add_task(async function setup` or similar patterns in
+ * favour of add_setup.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+function isNamedLikeSetup(name) {
+  return /^(init|setup)$/i.test(name);
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/no-addtask-setup.html",
+    },
+    fixable: "code",
+    messages: {
+      useAddSetup: "Do not use add_task() for setup, use add_setup() instead.",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+  create(context) {
+    return {
+      "Program > ExpressionStatement > CallExpression": function (node) {
+        let callee = node.callee;
+        if (callee.type === "Identifier" && callee.name === "add_task") {
+          let arg = node.arguments[0];
+          if (
+            arg.type !== "FunctionExpression" ||
+            !arg.id ||
+            !isNamedLikeSetup(arg.id.name)
+          ) {
+            return;
+          }
+          context.report({
+            node,
+            messageId: "useAddSetup",
+            fix: fixer => {
+              let range = [node.callee.range[0], arg.id.range[1]];
+              let asyncOrNot = arg.async ? "async " : "";
+              return fixer.replaceTextRange(
+                range,
+                `add_setup(${asyncOrNot}function`
+              );
+            },
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-arbitrary-setTimeout.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-arbitrary-setTimeout.js
new file mode 100644
index 0000000000..1888aff916
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-arbitrary-setTimeout.js
@@ -0,0 +1,65 @@
+/**
+ * @fileoverview Reject use of non-zero values in setTimeout
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var helpers = require("../helpers");
+var testTypes = new Set(["browser", "xpcshell"]);
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/no-arbitrary-setTimeout.html",
+    },
+    messages: {
+      listenForEvents:
+        "listen for events instead of setTimeout() with arbitrary delay",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    // We don't want to run this on mochitest plain as it already
+    // prevents flaky setTimeout at runtime. This check is built-in
+    // to the rule itself as sometimes other tests can live alongside
+    // plain mochitests and so it can't be configured via eslintrc.
+    if (!testTypes.has(helpers.getTestType(context))) {
+      return {};
+    }
+
+    return {
+      CallExpression(node) {
+        let callee = node.callee;
+        if (callee.type === "MemberExpression") {
+          if (
+            callee.property.name !== "setTimeout" ||
+            callee.object.name !== "window" ||
+            node.arguments.length < 2
+          ) {
+            return;
+          }
+        } else if (callee.type === "Identifier") {
+          if (callee.name !== "setTimeout" || node.arguments.length < 2) {
+            return;
+          }
+        } else {
+          return;
+        }
+
+        let timeout = node.arguments[1];
+        if (timeout.type !== "Literal" || timeout.value > 0) {
+          context.report({
+            node,
+            messageId: "listenForEvents",
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-compare-against-boolean-literals.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-compare-against-boolean-literals.js
new file mode 100644
index 0000000000..0dc986685a
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-compare-against-boolean-literals.js
@@ -0,0 +1,40 @@
+/**
+ * @fileoverview Restrict comparing against `true` or `false`.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/no-compare-against-boolean-literals.html",
+    },
+    messages: {
+      noCompareBoolean:
+        "Don't compare for inexact equality against boolean literals",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      BinaryExpression(node) {
+        if (
+          ["==", "!="].includes(node.operator) &&
+          (["true", "false"].includes(node.left.raw) ||
+            ["true", "false"].includes(node.right.raw))
+        ) {
+          context.report({
+            node,
+            messageId: "noCompareBoolean",
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-cu-reportError.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-cu-reportError.js
new file mode 100644
index 0000000000..ad2d01a10a
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-cu-reportError.js
@@ -0,0 +1,130 @@
+/**
+ * @fileoverview Reject common XPCOM methods called with useless optional
+ *               parameters, or non-existent parameters.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+function isCuReportError(node) {
+  return (
+    node.type == "MemberExpression" &&
+    node.object.type == "Identifier" &&
+    node.object.name == "Cu" &&
+    node.property.type == "Identifier" &&
+    node.property.name == "reportError"
+  );
+}
+
+function isConcatenation(node) {
+  return node.type == "BinaryExpression" && node.operator == "+";
+}
+
+function isIdentOrMember(node) {
+  return node.type == "MemberExpression" || node.type == "Identifier";
+}
+
+function isLiteralOrConcat(node) {
+  return node.type == "Literal" || isConcatenation(node);
+}
+
+function replaceConcatWithComma(fixer, node) {
+  let fixes = [];
+  let didFixTrailingIdentifier = false;
+  let recursiveFixes;
+  let trailingIdentifier;
+  // Deal with recursion first:
+  if (isConcatenation(node.right)) {
+    // Uh oh. If the RHS is a concatenation, there are parens involved,
+    // e.g.:
+    // console.error("literal" + (b + "literal"));
+    // It's pretty much impossible to guess what to do here so bail out:
+    return { fixes: [], trailingIdentifier: false };
+  }
+  if (isConcatenation(node.left)) {
+    ({ fixes: recursiveFixes, trailingIdentifier } = replaceConcatWithComma(
+      fixer,
+      node.left
+    ));
+    fixes.push(...recursiveFixes);
+  }
+  // If the left is an identifier or memberexpression, and the right is a
+  // literal or concatenation - or vice versa - replace a + with a comma:
+  if (
+    (isIdentOrMember(node.left) && isLiteralOrConcat(node.right)) ||
+    (isIdentOrMember(node.right) && isLiteralOrConcat(node.left)) ||
+    // Or if the rhs is a literal/concatenation, while the right-most part of
+    // the lhs is also an identifier (need 2 commas either side!)
+    (trailingIdentifier && isLiteralOrConcat(node.right))
+  ) {
+    fixes.push(
+      fixer.replaceTextRange([node.left.range[1], node.right.range[0]], ", ")
+    );
+    didFixTrailingIdentifier = isIdentOrMember(node.right);
+  }
+  return { fixes, trailingIdentifier: didFixTrailingIdentifier };
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/no-cu-reportError.html",
+    },
+    fixable: "code",
+    messages: {
+      useConsoleError: "Please use console.error instead of Cu.reportError",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        let checkNodes = [];
+        if (isCuReportError(node.callee)) {
+          // Handles cases of `Cu.reportError()`.
+          if (node.arguments.length > 1) {
+            // TODO: Bug 1802347 For initial landing, we allow the two
+            // argument form of Cu.reportError as the second argument is a stack
+            // argument which is more complicated to deal with.
+            return;
+          }
+          checkNodes = [node.callee];
+        } else if (node.arguments.length >= 1) {
+          // Handles cases of `.foo(Cu.reportError)`.
+          checkNodes = node.arguments.filter(n => isCuReportError(n));
+        }
+
+        for (let checkNode of checkNodes) {
+          context.report({
+            node,
+            fix: fixer => {
+              let fixes = [
+                fixer.replaceText(checkNode.object, "console"),
+                fixer.replaceText(checkNode.property, "error"),
+              ];
+              // If we're adding stuff together as an argument, split
+              // into multiple arguments instead:
+              if (
+                checkNode == node.callee &&
+                isConcatenation(node.arguments[0])
+              ) {
+                let { fixes: recursiveFixes } = replaceConcatWithComma(
+                  fixer,
+                  node.arguments[0]
+                );
+                fixes.push(...recursiveFixes);
+              }
+              return fixes;
+            },
+            messageId: "useConsoleError",
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-define-cc-etc.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-define-cc-etc.js
new file mode 100644
index 0000000000..aeee3170cc
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-define-cc-etc.js
@@ -0,0 +1,57 @@
+/**
+ * @fileoverview Reject defining Cc/Ci/Cr/Cu.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const componentsBlacklist = ["Cc", "Ci", "Cr", "Cu"];
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/no-define-cc-etc.html",
+    },
+    messages: {
+      noSeparateDefinition:
+        "{{name}} is now defined in global scope, a separate definition is no longer necessary.",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      VariableDeclarator(node) {
+        if (
+          node.id.type == "Identifier" &&
+          componentsBlacklist.includes(node.id.name)
+        ) {
+          context.report({
+            node,
+            messageId: "noSeparateDefinition",
+            data: { name: node.id.name },
+          });
+        }
+
+        if (node.id.type == "ObjectPattern") {
+          for (let property of node.id.properties) {
+            if (
+              property.type == "Property" &&
+              componentsBlacklist.includes(property.value.name)
+            ) {
+              context.report({
+                node,
+                messageId: "noSeparateDefinition",
+                data: { name: property.value.name },
+              });
+            }
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-redeclare-with-import-autofix.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-redeclare-with-import-autofix.js
new file mode 100644
index 0000000000..0eb5b9a3d7
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-redeclare-with-import-autofix.js
@@ -0,0 +1,160 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const { dirname, join } = require("path");
+
+const eslintBasePath = dirname(require.resolve("eslint"));
+
+const noredeclarePath = join(eslintBasePath, "rules/no-redeclare.js");
+const baseRule = require(noredeclarePath);
+const astUtils = require(join(eslintBasePath, "rules/utils/ast-utils.js"));
+
+// Hack alert: our eslint env is pretty confused about `require` and
+// `loader` for devtools modules - so ignore it for now.
+// See bug 1812547
+const gIgnoredImports = new Set(["loader", "require"]);
+
+/**
+ * Create a trap for a call to `report` that the original rule is
+ * trying to make on `context`.
+ *
+ * Returns a function that forwards to `report` but provides a fixer
+ * for redeclared imports that just removes those imports.
+ *
+ * @return {function}
+ */
+function trapReport(context) {
+  return function (obj) {
+    let declarator = obj.node.parent;
+    while (
+      declarator &&
+      declarator.parent &&
+      declarator.type != "VariableDeclarator"
+    ) {
+      declarator = declarator.parent;
+    }
+    if (
+      declarator &&
+      declarator.type == "VariableDeclarator" &&
+      declarator.id.type == "ObjectPattern" &&
+      declarator.init.type == "CallExpression"
+    ) {
+      let initialization = declarator.init;
+      if (
+        astUtils.isSpecificMemberAccess(
+          initialization.callee,
+          "ChromeUtils",
+          /^import(ESModule|)$/
+        )
+      ) {
+        // Hack alert: our eslint env is pretty confused about `require` and
+        // `loader` for devtools modules - so ignore it for now.
+        // See bug 1812547
+        if (gIgnoredImports.has(obj.node.name)) {
+          return;
+        }
+        // OK, we've got something we can fix. But we should be careful in case
+        // there are multiple imports being destructured.
+        // Do the easy (and common) case first - just one property:
+        if (declarator.id.properties.length == 1) {
+          context.report({
+            node: declarator.parent,
+            messageId: "duplicateImport",
+            data: {
+              name: declarator.id.properties[0].key.name,
+            },
+            fix(fixer) {
+              return fixer.remove(declarator.parent);
+            },
+          });
+          return;
+        }
+
+        // OK, figure out which import is duplicated here:
+        let node = obj.node.parent;
+        // Then remove a comma after it, or a comma before
+        // if there's no comma after it.
+        let sourceCode = context.getSourceCode();
+        let rangeToRemove = node.range;
+        let tokenAfter = sourceCode.getTokenAfter(node);
+        let tokenBefore = sourceCode.getTokenBefore(node);
+        if (astUtils.isCommaToken(tokenAfter)) {
+          rangeToRemove[1] = tokenAfter.range[1];
+        } else if (astUtils.isCommaToken(tokenBefore)) {
+          rangeToRemove[0] = tokenBefore.range[0];
+        }
+        context.report({
+          node,
+          messageId: "duplicateImport",
+          data: {
+            name: node.key.name,
+          },
+          fix(fixer) {
+            return fixer.removeRange(rangeToRemove);
+          },
+        });
+        return;
+      }
+    }
+    if (context.options[0]?.errorForNonImports) {
+      // Report the result from no-redeclare - we can't autofix it.
+      // This can happen for other redeclaration issues, e.g. naming
+      // variables in a way that conflicts with builtins like "URL" or
+      // "escape".
+      context.report(obj);
+    }
+  };
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/no-redeclare-with-import-autofix.html",
+    },
+    messages: {
+      ...baseRule.meta.messages,
+      duplicateImport:
+        "The import of '{{ name }}' is redundant with one set up earlier (e.g. head.js or the browser window environment). It should be removed.",
+    },
+    schema: [
+      {
+        type: "object",
+        properties: {
+          errorForNonImports: {
+            type: "boolean",
+            default: true,
+          },
+        },
+        additionalProperties: false,
+      },
+    ],
+    type: "suggestion",
+    fixable: "code",
+  },
+
+  create(context) {
+    // Test modules get the browser env applied wrongly in some cases,
+    // don't try and remove imports there. This works out of the box
+    // for sys.mjs modules because eslint won't check builtinGlobals
+    // for the no-redeclare rule.
+    if (context.getFilename().endsWith(".jsm")) {
+      return {};
+    }
+    let newOptions = [{ builtinGlobals: true }];
+    const contextForBaseRule = Object.create(context, {
+      report: {
+        value: trapReport(context),
+        writable: false,
+      },
+      options: {
+        value: newOptions,
+      },
+    });
+    return baseRule.create(contextForBaseRule);
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-throw-cr-literal.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-throw-cr-literal.js
new file mode 100644
index 0000000000..4b7aeb5151
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-throw-cr-literal.js
@@ -0,0 +1,101 @@
+/**
+ * @fileoverview Rule to prevent throwing bare Cr.ERRORs.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+function isCr(object) {
+  return object.type === "Identifier" && object.name === "Cr";
+}
+
+function isComponentsResults(object) {
+  return (
+    object.type === "MemberExpression" &&
+    object.object.type === "Identifier" &&
+    object.object.name === "Components" &&
+    object.property.type === "Identifier" &&
+    object.property.name === "results"
+  );
+}
+
+function isNewError(argument) {
+  return (
+    argument.type === "NewExpression" &&
+    argument.callee.type === "Identifier" &&
+    argument.callee.name === "Error" &&
+    argument.arguments.length === 1
+  );
+}
+
+function fixT(context, node, argument, fixer) {
+  const sourceText = context.getSourceCode().getText(argument);
+  return fixer.replaceText(node, `Components.Exception("", ${sourceText})`);
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/no-throw-cr-literal.html",
+    },
+    fixable: "code",
+    messages: {
+      bareCR: "Do not throw bare Cr.ERRORs, use Components.Exception instead",
+      bareComponentsResults:
+        "Do not throw bare Components.results.ERRORs, use Components.Exception instead",
+      newErrorCR:
+        "Do not pass Cr.ERRORs to new Error(), use Components.Exception instead",
+      newErrorComponentsResults:
+        "Do not pass Components.results.ERRORs to new Error(), use Components.Exception instead",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      ThrowStatement(node) {
+        if (node.argument.type === "MemberExpression") {
+          const fix = fixT.bind(null, context, node.argument, node.argument);
+
+          if (isCr(node.argument.object)) {
+            context.report({
+              node,
+              messageId: "bareCR",
+              fix,
+            });
+          } else if (isComponentsResults(node.argument.object)) {
+            context.report({
+              node,
+              messageId: "bareComponentsResults",
+              fix,
+            });
+          }
+        } else if (isNewError(node.argument)) {
+          const argument = node.argument.arguments[0];
+
+          if (argument.type === "MemberExpression") {
+            const fix = fixT.bind(null, context, node.argument, argument);
+
+            if (isCr(argument.object)) {
+              context.report({
+                node,
+                messageId: "newErrorCR",
+                fix,
+              });
+            } else if (isComponentsResults(argument.object)) {
+              context.report({
+                node,
+                messageId: "newErrorComponentsResults",
+                fix,
+              });
+            }
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-parameters.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-parameters.js
new file mode 100644
index 0000000000..cfbbaf601b
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-parameters.js
@@ -0,0 +1,156 @@
+/**
+ * @fileoverview Reject common XPCOM methods called with useless optional
+ *               parameters, or non-existent parameters.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/no-useless-parameters.html",
+    },
+    fixable: "code",
+    messages: {
+      newURIParams: "newURI's last parameters are optional.",
+      obmittedWhenFalse:
+        "{{fnName}}'s {{index}} parameter can be omitted when it's false.",
+      onlyTakes: "{{fnName}} only takes {{params}}",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    function getRangeAfterArgToEnd(argNumber, args) {
+      let sourceCode = context.getSourceCode();
+      return [
+        sourceCode.getTokenAfter(args[argNumber]).range[0],
+        args[args.length - 1].range[1],
+      ];
+    }
+
+    return {
+      CallExpression(node) {
+        let callee = node.callee;
+        if (
+          callee.type !== "MemberExpression" ||
+          callee.property.type !== "Identifier"
+        ) {
+          return;
+        }
+
+        let isFalse = arg => arg.type === "Literal" && arg.value === false;
+        let isFalsy = arg => arg.type === "Literal" && !arg.value;
+        let isBool = arg =>
+          arg.type === "Literal" && (arg.value === false || arg.value === true);
+        let name = callee.property.name;
+        let args = node.arguments;
+
+        if (
+          ["addEventListener", "removeEventListener", "addObserver"].includes(
+            name
+          ) &&
+          args.length === 3 &&
+          isFalse(args[2])
+        ) {
+          context.report({
+            node,
+            fix: fixer => {
+              return fixer.removeRange(getRangeAfterArgToEnd(1, args));
+            },
+            messageId: "obmittedWhenFalse",
+            data: { fnName: name, index: "third" },
+          });
+        }
+
+        if (name === "clearUserPref" && args.length > 1) {
+          context.report({
+            node,
+            fix: fixer => {
+              return fixer.removeRange(getRangeAfterArgToEnd(0, args));
+            },
+            messageId: "onlyTakes",
+            data: { fnName: name, params: "1 parameter" },
+          });
+        }
+
+        if (name === "removeObserver" && args.length === 3 && isBool(args[2])) {
+          context.report({
+            node,
+            fix: fixer => {
+              return fixer.removeRange(getRangeAfterArgToEnd(1, args));
+            },
+            messageId: "onlyTakes",
+            data: { fnName: name, params: "2 parameters" },
+          });
+        }
+
+        if (name === "appendElement" && args.length === 2 && isFalse(args[1])) {
+          context.report({
+            node,
+            fix: fixer => {
+              return fixer.removeRange(getRangeAfterArgToEnd(0, args));
+            },
+            messageId: "obmittedWhenFalse",
+            data: { fnName: name, index: "second" },
+          });
+        }
+
+        if (
+          name === "notifyObservers" &&
+          args.length === 3 &&
+          isFalsy(args[2])
+        ) {
+          context.report({
+            node,
+            fix: fixer => {
+              return fixer.removeRange(getRangeAfterArgToEnd(1, args));
+            },
+            messageId: "obmittedWhenFalse",
+            data: { fnName: name, index: "third" },
+          });
+        }
+
+        if (
+          name === "getComputedStyle" &&
+          args.length === 2 &&
+          isFalsy(args[1])
+        ) {
+          context.report({
+            node,
+            fix: fixer => {
+              return fixer.removeRange(getRangeAfterArgToEnd(0, args));
+            },
+            messageId: "obmittedWhenFalse",
+            data: { fnName: "getComputedStyle", index: "second" },
+          });
+        }
+
+        if (
+          name === "newURI" &&
+          args.length > 1 &&
+          isFalsy(args[args.length - 1])
+        ) {
+          context.report({
+            node,
+            fix: fixer => {
+              if (args.length > 2 && isFalsy(args[args.length - 2])) {
+                return fixer.removeRange(getRangeAfterArgToEnd(0, args));
+              }
+
+              return fixer.removeRange(
+                getRangeAfterArgToEnd(args.length - 2, args)
+              );
+            },
+            messageId: "newURIParams",
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-removeEventListener.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-removeEventListener.js
new file mode 100644
index 0000000000..4915cd16d5
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-removeEventListener.js
@@ -0,0 +1,69 @@
+/**
+ * @fileoverview Reject calls to removeEventListenter where {once: true} could
+ *               be used instead.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/no-useless-removeEventListener.html",
+    },
+    messages: {
+      useOnce:
+        "use {once: true} instead of removeEventListener as the first instruction of the listener",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        let callee = node.callee;
+        if (
+          callee.type !== "MemberExpression" ||
+          callee.property.type !== "Identifier" ||
+          callee.property.name !== "addEventListener" ||
+          node.arguments.length == 4
+        ) {
+          return;
+        }
+
+        let listener = node.arguments[1];
+        if (
+          !listener ||
+          listener.type != "FunctionExpression" ||
+          !listener.body ||
+          listener.body.type != "BlockStatement" ||
+          !listener.body.body.length ||
+          listener.body.body[0].type != "ExpressionStatement" ||
+          listener.body.body[0].expression.type != "CallExpression"
+        ) {
+          return;
+        }
+
+        let call = listener.body.body[0].expression;
+        if (
+          call.callee.type == "MemberExpression" &&
+          call.callee.property.type == "Identifier" &&
+          call.callee.property.name == "removeEventListener" &&
+          ((call.arguments[0].type == "Literal" &&
+            call.arguments[0].value == node.arguments[0].value) ||
+            (call.arguments[0].type == "Identifier" &&
+              call.arguments[0].name == node.arguments[0].name))
+        ) {
+          context.report({
+            node: call,
+            messageId: "useOnce",
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-run-test.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-run-test.js
new file mode 100644
index 0000000000..4218f45bbd
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-run-test.js
@@ -0,0 +1,76 @@
+/**
+ * @fileoverview Reject run_test() definitions where they aren't necessary.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/no-useless-run-test.html",
+    },
+    fixable: "code",
+    messages: {
+      noUselessRunTest:
+        "Useless run_test function - only contains run_next_test; whole function can be removed",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      "Program > FunctionDeclaration": function (node) {
+        if (
+          node.id.name === "run_test" &&
+          node.body.type === "BlockStatement" &&
+          node.body.body.length === 1 &&
+          node.body.body[0].type === "ExpressionStatement" &&
+          node.body.body[0].expression.type === "CallExpression" &&
+          node.body.body[0].expression.callee.name === "run_next_test"
+        ) {
+          context.report({
+            node,
+            fix: fixer => {
+              let sourceCode = context.getSourceCode();
+              let startNode;
+              if (sourceCode.getCommentsBefore) {
+                // ESLint 4 has getCommentsBefore.
+                startNode = sourceCode.getCommentsBefore(node);
+              } else if (node && node.body && node.leadingComments) {
+                // This is for ESLint 3.
+                startNode = node.leadingComments;
+              }
+
+              // If we have comments, we want the start node to be the comments,
+              // rather than the token before the comments, so that we don't
+              // remove the comments - for run_test, these are likely to be useful
+              // information about the test.
+              if (startNode?.length) {
+                startNode = startNode[startNode.length - 1];
+              } else {
+                startNode = sourceCode.getTokenBefore(node);
+              }
+
+              return fixer.removeRange([
+                // If there's no startNode, we fall back to zero, i.e. start of
+                // file.
+                startNode ? startNode.range[1] + 1 : 0,
+                // We know the function is a block and it'll end with }. Normally
+                // there's a new line after that, so just advance past it. This
+                // may be slightly not dodgy in some cases, but covers the existing
+                // cases.
+                node.range[1] + 1,
+              ]);
+            },
+            messageId: "noUselessRunTest",
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/prefer-boolean-length-check.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/prefer-boolean-length-check.js
new file mode 100644
index 0000000000..0e2685ec28
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/prefer-boolean-length-check.js
@@ -0,0 +1,129 @@
+/**
+ * @fileoverview Prefer boolean length check
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+function funcForBooleanLength(context, node, conditionCheck) {
+  let newText = "";
+  const sourceCode = context.getSourceCode();
+  switch (node.operator) {
+    case ">":
+      if (node.right.value == 0) {
+        if (conditionCheck) {
+          newText = sourceCode.getText(node.left);
+        } else {
+          newText = "!!" + sourceCode.getText(node.left);
+        }
+      } else {
+        newText = "!" + sourceCode.getText(node.right);
+      }
+      break;
+    case "<":
+      if (node.right.value == 0) {
+        newText = "!" + sourceCode.getText(node.left);
+      } else if (conditionCheck) {
+        newText = sourceCode.getText(node.right);
+      } else {
+        newText = "!!" + sourceCode.getText(node.right);
+      }
+      break;
+    case "==":
+      if (node.right.value == 0) {
+        newText = "!" + sourceCode.getText(node.left);
+      } else {
+        newText = "!" + sourceCode.getText(node.right);
+      }
+      break;
+    case "!=":
+      if (node.right.value == 0) {
+        if (conditionCheck) {
+          newText = sourceCode.getText(node.left);
+        } else {
+          newText = "!!" + sourceCode.getText(node.left);
+        }
+      } else if (conditionCheck) {
+        newText = sourceCode.getText(node.right);
+      } else {
+        newText = "!!" + sourceCode.getText(node.right);
+      }
+      break;
+  }
+  return newText;
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/prefer-boolean-length-check.html",
+    },
+    fixable: "code",
+    messages: {
+      preferBooleanCheck: "Prefer boolean length check",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    const conditionStatement = [
+      "IfStatement",
+      "WhileStatement",
+      "DoWhileStatement",
+      "ForStatement",
+      "ForInStatement",
+      "ConditionalExpression",
+    ];
+
+    return {
+      BinaryExpression(node) {
+        if (
+          ["==", "!=", ">", "<"].includes(node.operator) &&
+          ((node.right.type == "Literal" &&
+            node.right.value == 0 &&
+            node.left.property?.name == "length") ||
+            (node.left.type == "Literal" &&
+              node.left.value == 0 &&
+              node.right.property?.name == "length"))
+        ) {
+          if (
+            conditionStatement.includes(node.parent.type) ||
+            (node.parent.type == "LogicalExpression" &&
+              conditionStatement.includes(node.parent.parent.type))
+          ) {
+            context.report({
+              node,
+              fix: fixer => {
+                let generateExpression = funcForBooleanLength(
+                  context,
+                  node,
+                  true
+                );
+
+                return fixer.replaceText(node, generateExpression);
+              },
+              messageId: "preferBooleanCheck",
+            });
+          } else {
+            context.report({
+              node,
+              fix: fixer => {
+                let generateExpression = funcForBooleanLength(
+                  context,
+                  node,
+                  false
+                );
+                return fixer.replaceText(node, generateExpression);
+              },
+              messageId: "preferBooleanCheck",
+            });
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/prefer-formatValues.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/prefer-formatValues.js
new file mode 100644
index 0000000000..29daca3c7c
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/prefer-formatValues.js
@@ -0,0 +1,97 @@
+/**
+ * @fileoverview Reject multiple calls to document.l10n.formatValue in the same
+ * code block.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+function isIdentifier(node, id) {
+  return node && node.type === "Identifier" && node.name === id;
+}
+
+/**
+ * As we enter blocks new sets are pushed onto this stack and then popped when
+ * we exit the block.
+ */
+const BlockStack = [];
+
+module.exports = {
+  meta: {
+    docs: {
+      description: "disallow multiple document.l10n.formatValue calls",
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/prefer-formatValues.html",
+    },
+    messages: {
+      outsideCallBlock: "call expression found outside of known block",
+      useSingleCall:
+        "prefer to use a single document.l10n.formatValues call instead " +
+        "of multiple calls to document.l10n.formatValue or document.l10n.formatValues",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    function enterBlock() {
+      BlockStack.push(new Set());
+    }
+
+    function exitBlock() {
+      let calls = BlockStack.pop();
+      if (calls.size > 1) {
+        for (let callNode of calls) {
+          context.report({
+            node: callNode,
+            messageId: "useSingleCall",
+          });
+        }
+      }
+    }
+
+    return {
+      Program: enterBlock,
+      "Program:exit": exitBlock,
+      BlockStatement: enterBlock,
+      "BlockStatement:exit": exitBlock,
+
+      CallExpression(node) {
+        if (!BlockStack.length) {
+          context.report({
+            node,
+            messageId: "outsideCallBlock",
+          });
+        }
+
+        let callee = node.callee;
+        if (callee.type !== "MemberExpression") {
+          return;
+        }
+
+        if (
+          !isIdentifier(callee.property, "formatValue") &&
+          !isIdentifier(callee.property, "formatValues")
+        ) {
+          return;
+        }
+
+        if (callee.object.type !== "MemberExpression") {
+          return;
+        }
+
+        if (
+          !isIdentifier(callee.object.object, "document") ||
+          !isIdentifier(callee.object.property, "l10n")
+        ) {
+          return;
+        }
+
+        let calls = BlockStack[BlockStack.length - 1];
+        calls.add(node);
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-addtask-only.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-addtask-only.js
new file mode 100644
index 0000000000..fa6de2f8b9
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-addtask-only.js
@@ -0,0 +1,48 @@
+/**
+ * @fileoverview Don't allow only() in tests
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/reject-addtask-only.html",
+    },
+    hasSuggestions: true,
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        if (
+          ["add_task", "decorate_task"].includes(
+            node.callee.object?.callee?.name
+          ) &&
+          node.callee.property?.name == "only"
+        ) {
+          context.report({
+            node,
+            message: `add_task(...).only() not allowed - add an exception if this is intentional`,
+            suggest: [
+              {
+                desc: "Remove only() call from task",
+                fix: fixer =>
+                  fixer.replaceTextRange(
+                    [node.callee.object.range[1], node.range[1]],
+                    ""
+                  ),
+              },
+            ],
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-chromeutils-import-params.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-chromeutils-import-params.js
new file mode 100644
index 0000000000..4fbd126b65
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-chromeutils-import-params.js
@@ -0,0 +1,62 @@
+/**
+ * @fileoverview Reject calls to ChromeUtils.import(..., null). This allows to
+ * retrieve the global object for the JSM, instead we should rely on explicitly
+ * exported symbols.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+function isIdentifier(node, id) {
+  return node && node.type === "Identifier" && node.name === id;
+}
+
+function getRangeAfterArgToEnd(context, argNumber, args) {
+  let sourceCode = context.getSourceCode();
+  return [
+    sourceCode.getTokenAfter(args[argNumber]).range[0],
+    args[args.length - 1].range[1],
+  ];
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/reject-chromeutils-import-params.html",
+    },
+    hasSuggestions: true,
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        let { callee } = node;
+        if (
+          isIdentifier(callee.object, "ChromeUtils") &&
+          isIdentifier(callee.property, "import") &&
+          node.arguments.length >= 2
+        ) {
+          context.report({
+            node,
+            message: "ChromeUtils.import only takes one argument.",
+            suggest: [
+              {
+                desc: "Remove the unnecessary parameters.",
+                fix: fixer => {
+                  return fixer.removeRange(
+                    getRangeAfterArgToEnd(context, 0, node.arguments)
+                  );
+                },
+              },
+            ],
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-eager-module-in-lazy-getter.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-eager-module-in-lazy-getter.js
new file mode 100644
index 0000000000..df397ad253
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-eager-module-in-lazy-getter.js
@@ -0,0 +1,103 @@
+/**
+ * @fileoverview Reject use of lazy getters for modules that's loaded early in
+ *               the startup process and not necessarily be lazy.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+const helpers = require("../helpers");
+
+function isString(node) {
+  return node.type === "Literal" && typeof node.value === "string";
+}
+
+function isEagerModule(resourceURI) {
+  return [
+    "resource://gre/modules/Services",
+    "resource://gre/modules/XPCOMUtils",
+    "resource://gre/modules/AppConstants",
+  ].includes(resourceURI.replace(/(\.jsm|\.jsm\.js|\.js|\.sys\.mjs)$/, ""));
+}
+
+function checkEagerModule(context, node, resourceURI) {
+  if (!isEagerModule(resourceURI)) {
+    return;
+  }
+  context.report({
+    node,
+    messageId: "eagerModule",
+    data: { uri: resourceURI },
+  });
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-eager-module-in-lazy-getter.html",
+    },
+    messages: {
+      eagerModule:
+        'Module "{{uri}}" is known to be loaded early in the startup process, and should be loaded eagerly, instead of defining a lazy getter.',
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        if (node.callee.type !== "MemberExpression") {
+          return;
+        }
+
+        let callerSource;
+        try {
+          callerSource = helpers.getASTSource(node.callee);
+        } catch (e) {
+          return;
+        }
+
+        if (
+          callerSource === "XPCOMUtils.defineLazyModuleGetter" ||
+          callerSource === "ChromeUtils.defineModuleGetter"
+        ) {
+          if (node.arguments.length < 3) {
+            return;
+          }
+          const resourceURINode = node.arguments[2];
+          if (!isString(resourceURINode)) {
+            return;
+          }
+          checkEagerModule(context, node, resourceURINode.value);
+        } else if (
+          callerSource === "XPCOMUtils.defineLazyModuleGetters" ||
+          callerSource === "ChromeUtils.defineESModuleGetters"
+        ) {
+          if (node.arguments.length < 2) {
+            return;
+          }
+          const obj = node.arguments[1];
+          if (obj.type !== "ObjectExpression") {
+            return;
+          }
+          for (let prop of obj.properties) {
+            if (prop.type !== "Property") {
+              continue;
+            }
+            if (prop.kind !== "init") {
+              continue;
+            }
+            const resourceURINode = prop.value;
+            if (!isString(resourceURINode)) {
+              continue;
+            }
+            checkEagerModule(context, node, resourceURINode.value);
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-global-this.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-global-this.js
new file mode 100644
index 0000000000..61d2b9639a
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-global-this.js
@@ -0,0 +1,40 @@
+/**
+ * @fileoverview Reject attempts to use the global object in jsms.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const helpers = require("../helpers");
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/reject-global-this.html",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      ThisExpression(node) {
+        if (!helpers.getIsGlobalThis(context.getAncestors())) {
+          return;
+        }
+
+        context.report({
+          node,
+          message: `JSM should not use the global this`,
+        });
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-globalThis-modification.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-globalThis-modification.js
new file mode 100644
index 0000000000..4bcf7e3822
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-globalThis-modification.js
@@ -0,0 +1,70 @@
+/**
+ * @fileoverview Enforce the standard object name for
+ * ChromeUtils.defineESMGetters
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+function isIdentifier(node, id) {
+  return node.type === "Identifier" && node.name === id;
+}
+
+function calleeToString(node) {
+  if (node.type === "Identifier") {
+    return node.name;
+  }
+
+  if (node.type === "MemberExpression" && !node.computed) {
+    return calleeToString(node.object) + "." + node.property.name;
+  }
+
+  return "???";
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/reject-globalThis-modification.html",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      AssignmentExpression(node, parents) {
+        let target = node.left;
+        while (target.type === "MemberExpression") {
+          target = target.object;
+        }
+        if (isIdentifier(target, "globalThis")) {
+          context.report({
+            node,
+            message:
+              "`globalThis` shouldn't be modified. `globalThis` is the shared global inside the system module, and properties defined on it is visible from all modules.",
+          });
+        }
+      },
+      CallExpression(node) {
+        const calleeStr = calleeToString(node.callee);
+        if (calleeStr.endsWith(".deserialize")) {
+          return;
+        }
+
+        for (const arg of node.arguments) {
+          if (isIdentifier(arg, "globalThis")) {
+            context.report({
+              node,
+              message:
+                "`globalThis` shouldn't be passed to function that can modify it. `globalThis` is the shared global inside the system module, and properties defined on it is visible from all modules.",
+            });
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-import-system-module-from-non-system.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-import-system-module-from-non-system.js
new file mode 100644
index 0000000000..9e640a696c
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-import-system-module-from-non-system.js
@@ -0,0 +1,36 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/reject-import-system-module-from-non-system.html",
+    },
+    messages: {
+      rejectStaticImportSystemModuleFromNonSystem:
+        "System modules (*.sys.mjs) can be imported with static import declaration only from system modules.",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      ImportDeclaration(node) {
+        if (!node.source.value.endsWith(".sys.mjs")) {
+          return;
+        }
+
+        context.report({
+          node,
+          messageId: "rejectStaticImportSystemModuleFromNonSystem",
+        });
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-importGlobalProperties.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-importGlobalProperties.js
new file mode 100644
index 0000000000..1012c12350
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-importGlobalProperties.js
@@ -0,0 +1,94 @@
+/**
+ * @fileoverview Reject use of Cu.importGlobalProperties
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const path = require("path");
+
+const privilegedGlobals = Object.keys(
+  require("../environments/privileged.js").globals
+);
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/reject-importGlobalProperties.html",
+    },
+    messages: {
+      unexpectedCall: "Unexpected call to Cu.importGlobalProperties",
+      unexpectedCallCuWebIdl:
+        "Unnecessary call to Cu.importGlobalProperties for {{name}} (webidl names are automatically imported)",
+      unexpectedCallXPCOMWebIdl:
+        "Unnecessary call to XPCOMUtils.defineLazyGlobalGetters for {{name}} (webidl names are automatically imported)",
+    },
+    schema: [
+      {
+        enum: ["everything", "allownonwebidl"],
+      },
+    ],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        if (
+          node.callee.type !== "MemberExpression" ||
+          // TODO Bug 1501127: sjs files have their own sandbox, and do not inherit
+          // the Window backstage pass directly.
+          path.extname(context.getFilename()) == ".sjs"
+        ) {
+          return;
+        }
+        let memexp = node.callee;
+        if (
+          memexp.object.type === "Identifier" &&
+          // Only Cu, not Components.utils as `use-cc-etc` handles this for us.
+          memexp.object.name === "Cu" &&
+          memexp.property.type === "Identifier" &&
+          memexp.property.name === "importGlobalProperties"
+        ) {
+          if (context.options.includes("allownonwebidl")) {
+            for (let element of node.arguments[0].elements) {
+              if (privilegedGlobals.includes(element.value)) {
+                context.report({
+                  node,
+                  messageId: "unexpectedCallCuWebIdl",
+                  data: { name: element.value },
+                });
+              }
+            }
+          } else {
+            context.report({ node, messageId: "unexpectedCall" });
+          }
+        }
+        if (
+          memexp.object.type === "Identifier" &&
+          memexp.object.name === "XPCOMUtils" &&
+          memexp.property.type === "Identifier" &&
+          memexp.property.name === "defineLazyGlobalGetters" &&
+          node.arguments.length >= 2
+        ) {
+          if (context.options.includes("allownonwebidl")) {
+            for (let element of node.arguments[1].elements) {
+              if (privilegedGlobals.includes(element.value)) {
+                context.report({
+                  node,
+                  messageId: "unexpectedCallXPCOMWebIdl",
+                  data: { name: element.value },
+                });
+              }
+            }
+          } else {
+            context.report({ node, messageId: "unexpectedCall" });
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-lazy-imports-into-globals.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-lazy-imports-into-globals.js
new file mode 100644
index 0000000000..433db12e08
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-lazy-imports-into-globals.js
@@ -0,0 +1,76 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const helpers = require("../helpers");
+
+const callExpressionDefinitions = [
+  /^loader\.lazyGetter\((?:globalThis|window), "(\w+)"/,
+  /^loader\.lazyServiceGetter\((?:globalThis|window), "(\w+)"/,
+  /^loader\.lazyRequireGetter\((?:globalThis|window), "(\w+)"/,
+  /^XPCOMUtils\.defineLazyGetter\((?:globalThis|window), "(\w+)"/,
+  /^XPCOMUtils\.defineLazyModuleGetter\((?:globalThis|window), "(\w+)"/,
+  /^ChromeUtils\.defineLazyGetter\((?:globalThis|window), "(\w+)"/,
+  /^ChromeUtils\.defineModuleGetter\((?:globalThis|window), "(\w+)"/,
+  /^XPCOMUtils\.defineLazyPreferenceGetter\((?:globalThis|window), "(\w+)"/,
+  /^XPCOMUtils\.defineLazyProxy\((?:globalThis|window), "(\w+)"/,
+  /^XPCOMUtils\.defineLazyScriptGetter\((?:globalThis|window), "(\w+)"/,
+  /^XPCOMUtils\.defineLazyServiceGetter\((?:globalThis|window), "(\w+)"/,
+  /^XPCOMUtils\.defineConstant\((?:globalThis|window), "(\w+)"/,
+  /^DevToolsUtils\.defineLazyModuleGetter\((?:globalThis|window), "(\w+)"/,
+  /^DevToolsUtils\.defineLazyGetter\((?:globalThis|window), "(\w+)"/,
+  /^Object\.defineProperty\((?:globalThis|window), "(\w+)"/,
+  /^Reflect\.defineProperty\((?:globalThis|window), "(\w+)"/,
+  /^this\.__defineGetter__\("(\w+)"/,
+];
+
+const callExpressionMultiDefinitions = [
+  "XPCOMUtils.defineLazyGlobalGetters(window,",
+  "XPCOMUtils.defineLazyGlobalGetters(globalThis,",
+  "XPCOMUtils.defineLazyModuleGetters(window,",
+  "XPCOMUtils.defineLazyModuleGetters(globalThis,",
+  "XPCOMUtils.defineLazyServiceGetters(window,",
+  "XPCOMUtils.defineLazyServiceGetters(globalThis,",
+  "ChromeUtils.defineESModuleGetters(window,",
+  "ChromeUtils.defineESModuleGetters(globalThis,",
+  "loader.lazyRequireGetter(window,",
+  "loader.lazyRequireGetter(globalThis,",
+];
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/reject-lazy-imports-into-globals.html",
+    },
+    messages: {
+      rejectLazyImportsIntoGlobals:
+        "Non-system modules should not import into globalThis nor window. Prefer a lazy object holder",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        let source;
+        try {
+          source = helpers.getASTSource(node);
+        } catch (e) {
+          return;
+        }
+
+        if (
+          callExpressionDefinitions.some(expr => source.match(expr)) ||
+          callExpressionMultiDefinitions.some(expr => source.startsWith(expr))
+        ) {
+          context.report({ node, messageId: "rejectLazyImportsIntoGlobals" });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-mixing-eager-and-lazy.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-mixing-eager-and-lazy.js
new file mode 100644
index 0000000000..39cb4b5fc3
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-mixing-eager-and-lazy.js
@@ -0,0 +1,153 @@
+/**
+ * @fileoverview Reject use of lazy getters for modules that's loaded early in
+ *               the startup process and not necessarily be lazy.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+const helpers = require("../helpers");
+
+function isIdentifier(node, id) {
+  return node.type === "Identifier" && node.name === id;
+}
+
+function isString(node) {
+  return node.type === "Literal" && typeof node.value === "string";
+}
+
+function checkMixed(loadedModules, context, node, type, resourceURI) {
+  if (!loadedModules.has(resourceURI)) {
+    loadedModules.set(resourceURI, type);
+  }
+
+  if (loadedModules.get(resourceURI) === type) {
+    return;
+  }
+
+  context.report({
+    node,
+    messageId: "mixedEagerAndLazy",
+    data: { uri: resourceURI },
+  });
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-mixed-eager-and-lazy.html",
+    },
+    messages: {
+      mixedEagerAndLazy:
+        'Module "{{uri}}" is loaded eagerly, and should not be used for lazy getter.',
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    const loadedModules = new Map();
+
+    return {
+      ImportDeclaration(node) {
+        const resourceURI = node.source.value;
+        checkMixed(loadedModules, context, node, "eager", resourceURI);
+      },
+      CallExpression(node) {
+        if (node.callee.type !== "MemberExpression") {
+          return;
+        }
+
+        let callerSource;
+        try {
+          callerSource = helpers.getASTSource(node.callee);
+        } catch (e) {
+          return;
+        }
+
+        if (
+          (callerSource === "ChromeUtils.import" ||
+            callerSource === "ChromeUtils.importESModule") &&
+          helpers.getIsTopLevelAndUnconditionallyExecuted(
+            context.getAncestors()
+          )
+        ) {
+          if (node.arguments.length < 1) {
+            return;
+          }
+          const resourceURINode = node.arguments[0];
+          if (!isString(resourceURINode)) {
+            return;
+          }
+          checkMixed(
+            loadedModules,
+            context,
+            node,
+            "eager",
+            resourceURINode.value
+          );
+        }
+
+        if (
+          callerSource === "XPCOMUtils.defineLazyModuleGetter" ||
+          callerSource === "ChromeUtils.defineModuleGetter"
+        ) {
+          if (node.arguments.length < 3) {
+            return;
+          }
+          if (!isIdentifier(node.arguments[0], "lazy")) {
+            return;
+          }
+
+          const resourceURINode = node.arguments[2];
+          if (!isString(resourceURINode)) {
+            return;
+          }
+          checkMixed(
+            loadedModules,
+            context,
+            node,
+            "lazy",
+            resourceURINode.value
+          );
+        } else if (
+          callerSource === "XPCOMUtils.defineLazyModuleGetters" ||
+          callerSource === "ChromeUtils.defineESModuleGetters"
+        ) {
+          if (node.arguments.length < 2) {
+            return;
+          }
+          if (!isIdentifier(node.arguments[0], "lazy")) {
+            return;
+          }
+
+          const obj = node.arguments[1];
+          if (obj.type !== "ObjectExpression") {
+            return;
+          }
+          for (let prop of obj.properties) {
+            if (prop.type !== "Property") {
+              continue;
+            }
+            if (prop.kind !== "init") {
+              continue;
+            }
+            const resourceURINode = prop.value;
+            if (!isString(resourceURINode)) {
+              continue;
+            }
+            checkMixed(
+              loadedModules,
+              context,
+              node,
+              "lazy",
+              resourceURINode.value
+            );
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-multiple-getters-calls.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-multiple-getters-calls.js
new file mode 100644
index 0000000000..73d60f3485
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-multiple-getters-calls.js
@@ -0,0 +1,81 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const helpers = require("../helpers");
+
+function findStatement(node) {
+  while (node && node.type !== "ExpressionStatement") {
+    node = node.parent;
+  }
+
+  return node;
+}
+
+function isIdentifier(node, id) {
+  return node && node.type === "Identifier" && node.name === id;
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/reject-multiple-getters-calls.html",
+    },
+    messages: {
+      rejectMultipleCalls:
+        "ChromeUtils.defineESModuleGetters is already called for {{target}} in the same context. Please merge those calls",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    const parentToTargets = new Map();
+
+    return {
+      CallExpression(node) {
+        let callee = node.callee;
+        if (
+          callee.type === "MemberExpression" &&
+          isIdentifier(callee.object, "ChromeUtils") &&
+          isIdentifier(callee.property, "defineESModuleGetters")
+        ) {
+          const stmt = findStatement(node);
+          if (!stmt) {
+            return;
+          }
+
+          let target;
+          try {
+            target = helpers.getASTSource(node.arguments[0]);
+          } catch (e) {
+            return;
+          }
+
+          const parent = stmt.parent;
+          let targets;
+          if (parentToTargets.has(parent)) {
+            targets = parentToTargets.get(parent);
+          } else {
+            targets = new Set();
+            parentToTargets.set(parent, targets);
+          }
+
+          if (targets.has(target)) {
+            context.report({
+              node,
+              messageId: "rejectMultipleCalls",
+              data: { target },
+            });
+          }
+
+          targets.add(target);
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-relative-requires.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-relative-requires.js
new file mode 100644
index 0000000000..3231656941
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-relative-requires.js
@@ -0,0 +1,39 @@
+/**
+ * @fileoverview Reject some uses of require.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var helpers = require("../helpers");
+
+const isRelativePath = function (path) {
+  return path.startsWith("./") || path.startsWith("../");
+};
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/reject-relative-requires.html",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        const path = helpers.getDevToolsRequirePath(node);
+        if (path && isRelativePath(path)) {
+          context.report({
+            node,
+            message: "relative paths are not allowed with require()",
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-scriptableunicodeconverter.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-scriptableunicodeconverter.js
new file mode 100644
index 0000000000..03474d8838
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-scriptableunicodeconverter.js
@@ -0,0 +1,41 @@
+/**
+ * @fileoverview Reject calls into Ci.nsIScriptableUnicodeConverter. We're phasing this out in
+ * favour of TextEncoder or TextDecoder.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+function isIdentifier(node, id) {
+  return node && node.type === "Identifier" && node.name === id;
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/reject-scriptableunicodeconverter.html",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      MemberExpression(node) {
+        if (
+          isIdentifier(node.object, "Ci") &&
+          isIdentifier(node.property, "nsIScriptableUnicodeConverter")
+        ) {
+          context.report({
+            node,
+            message:
+              "Ci.nsIScriptableUnicodeConverter is deprecated. You should use TextEncoder or TextDecoder instead.",
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-some-requires.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-some-requires.js
new file mode 100644
index 0000000000..9495b0ff11
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-some-requires.js
@@ -0,0 +1,41 @@
+/**
+ * @fileoverview Reject some uses of require.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var helpers = require("../helpers");
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/reject-some-requires.html",
+    },
+    schema: [
+      {
+        type: "string",
+      },
+    ],
+    type: "problem",
+  },
+
+  create(context) {
+    if (typeof context.options[0] !== "string") {
+      throw new Error("reject-some-requires expects a regexp");
+    }
+    const RX = new RegExp(context.options[0]);
+
+    return {
+      CallExpression(node) {
+        const path = helpers.getDevToolsRequirePath(node);
+        if (path && RX.test(path)) {
+          context.report({ node, message: `require(${path}) is not allowed` });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-top-level-await.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-top-level-await.js
new file mode 100644
index 0000000000..023a62b9fc
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-top-level-await.js
@@ -0,0 +1,45 @@
+/**
+ * @fileoverview Don't allow only() in tests
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var helpers = require("../helpers");
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/reject-top-level-await.html",
+    },
+    messages: {
+      rejectTopLevelAwait:
+        "Top-level await is not currently supported in component files.",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      AwaitExpression(node) {
+        if (!helpers.getIsTopLevelScript(context.getAncestors())) {
+          return;
+        }
+        context.report({ node, messageId: "rejectTopLevelAwait" });
+      },
+      ForOfStatement(node) {
+        if (
+          !node.await ||
+          !helpers.getIsTopLevelScript(context.getAncestors())
+        ) {
+          return;
+        }
+        context.report({ node, messageId: "rejectTopLevelAwait" });
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/rejects-requires-await.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/rejects-requires-await.js
new file mode 100644
index 0000000000..b806e6154d
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/rejects-requires-await.js
@@ -0,0 +1,47 @@
+/**
+ * @fileoverview Ensure Assert.rejects is preceded by await.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/reject-requires-await.html",
+    },
+    messages: {
+      rejectRequiresAwait: "Assert.rejects needs to be preceded by await.",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        if (node.callee.type === "MemberExpression") {
+          let memexp = node.callee;
+          if (
+            memexp.object.type === "Identifier" &&
+            memexp.object.name === "Assert" &&
+            memexp.property.type === "Identifier" &&
+            memexp.property.name === "rejects"
+          ) {
+            // We have ourselves an Assert.rejects.
+
+            if (node.parent.type !== "AwaitExpression") {
+              context.report({
+                node,
+                messageId: "rejectRequiresAwait",
+              });
+            }
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-cc-etc.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-cc-etc.js
new file mode 100644
index 0000000000..fe2e0b518d
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-cc-etc.js
@@ -0,0 +1,52 @@
+/**
+ * @fileoverview Reject use of Components.classes etc, prefer the shorthand instead.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const componentsMap = {
+  classes: "Cc",
+  interfaces: "Ci",
+  results: "Cr",
+  utils: "Cu",
+};
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/use-cc-etc.html",
+    },
+    fixable: "code",
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      MemberExpression(node) {
+        if (
+          node.object.type === "Identifier" &&
+          node.object.name === "Components" &&
+          node.property.type === "Identifier" &&
+          Object.getOwnPropertyNames(componentsMap).includes(node.property.name)
+        ) {
+          context.report({
+            node,
+            message: `Use ${
+              componentsMap[node.property.name]
+            } rather than Components.${node.property.name}`,
+            fix: fixer =>
+              fixer.replaceTextRange(
+                [node.range[0], node.range[1]],
+                componentsMap[node.property.name]
+              ),
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-chromeutils-generateqi.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-chromeutils-generateqi.js
new file mode 100644
index 0000000000..5b8b58855d
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-chromeutils-generateqi.js
@@ -0,0 +1,105 @@
+/**
+ * @fileoverview Reject use of XPCOMUtils.generateQI and JS-implemented
+ *               QueryInterface methods in favor of ChromeUtils.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+function isIdentifier(node, id) {
+  return node && node.type === "Identifier" && node.name === id;
+}
+
+function isMemberExpression(node, object, member) {
+  return (
+    node.type === "MemberExpression" &&
+    isIdentifier(node.object, object) &&
+    isIdentifier(node.property, member)
+  );
+}
+
+const MSG_NO_JS_QUERY_INTERFACE =
+  "Please use ChromeUtils.generateQI rather than manually creating " +
+  "JavaScript QueryInterface functions";
+
+const MSG_NO_XPCOMUTILS_GENERATEQI =
+  "Please use ChromeUtils.generateQI instead of XPCOMUtils.generateQI";
+
+function funcToGenerateQI(context, node) {
+  const sourceCode = context.getSourceCode();
+  const text = sourceCode.getText(node);
+
+  let interfaces = [];
+  let match;
+  let re = /\bCi\.([a-zA-Z0-9]+)\b|\b(nsI[A-Z][a-zA-Z0-9]+)\b/g;
+  while ((match = re.exec(text))) {
+    interfaces.push(match[1] || match[2]);
+  }
+
+  let ifaces = interfaces
+    .filter(iface => iface != "nsISupports")
+    .map(iface => JSON.stringify(iface))
+    .join(", ");
+
+  return `ChromeUtils.generateQI([${ifaces}])`;
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/use-chromeutils-generateqi.html",
+    },
+    fixable: "code",
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        let { callee } = node;
+        if (isMemberExpression(callee, "XPCOMUtils", "generateQI")) {
+          context.report({
+            node,
+            message: MSG_NO_XPCOMUTILS_GENERATEQI,
+            fix(fixer) {
+              return fixer.replaceText(callee, "ChromeUtils.generateQI");
+            },
+          });
+        }
+      },
+
+      "AssignmentExpression > MemberExpression[property.name='QueryInterface']":
+        function (node) {
+          const { right } = node.parent;
+          if (right.type === "FunctionExpression") {
+            context.report({
+              node: node.parent,
+              message: MSG_NO_JS_QUERY_INTERFACE,
+              fix(fixer) {
+                return fixer.replaceText(
+                  right,
+                  funcToGenerateQI(context, right)
+                );
+              },
+            });
+          }
+        },
+
+      "Property[key.name='QueryInterface'][value.type='FunctionExpression']":
+        function (node) {
+          context.report({
+            node,
+            message: MSG_NO_JS_QUERY_INTERFACE,
+            fix(fixer) {
+              let generateQI = funcToGenerateQI(context, node.value);
+              return fixer.replaceText(node, `QueryInterface: ${generateQI}`);
+            },
+          });
+        },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-chromeutils-import.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-chromeutils-import.js
new file mode 100644
index 0000000000..90877bed11
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-chromeutils-import.js
@@ -0,0 +1,78 @@
+/**
+ * @fileoverview Reject use of Cu.import and XPCOMUtils.defineLazyModuleGetter
+ *               in favor of ChromeUtils.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+function isIdentifier(node, id) {
+  return node && node.type === "Identifier" && node.name === id;
+}
+
+function isMemberExpression(node, object, member) {
+  return (
+    node.type === "MemberExpression" &&
+    isIdentifier(node.object, object) &&
+    isIdentifier(node.property, member)
+  );
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/use-chromeutils-import.html",
+    },
+    fixable: "code",
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        if (node.callee.type !== "MemberExpression") {
+          return;
+        }
+
+        let { callee } = node;
+
+        // Is the expression starting with `Cu` or `Components.utils`?
+        if (
+          (isIdentifier(callee.object, "Cu") ||
+            isMemberExpression(callee.object, "Components", "utils")) &&
+          isIdentifier(callee.property, "import")
+        ) {
+          context.report({
+            node,
+            message: "Please use ChromeUtils.import instead of Cu.import",
+            fix(fixer) {
+              return fixer.replaceText(callee, "ChromeUtils.import");
+            },
+          });
+        }
+
+        if (
+          isMemberExpression(callee, "XPCOMUtils", "defineLazyModuleGetter") &&
+          node.arguments.length < 4
+        ) {
+          context.report({
+            node,
+            message:
+              "Please use ChromeUtils.defineModuleGetter instead of " +
+              "XPCOMUtils.defineLazyModuleGetter",
+            fix(fixer) {
+              return fixer.replaceText(
+                callee,
+                "ChromeUtils.defineModuleGetter"
+              );
+            },
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-default-preference-values.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-default-preference-values.js
new file mode 100644
index 0000000000..87fc07057d
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-default-preference-values.js
@@ -0,0 +1,52 @@
+/**
+ * @fileoverview Require providing a second parameter to get*Pref
+ * methods instead of using a try/catch block.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/use-default-preference-values.html",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      TryStatement(node) {
+        let types = ["Bool", "Char", "Float", "Int"];
+        let methods = types.map(type => "get" + type + "Pref");
+        if (
+          node.block.type != "BlockStatement" ||
+          node.block.body.length != 1
+        ) {
+          return;
+        }
+
+        let firstStm = node.block.body[0];
+        if (
+          firstStm.type != "ExpressionStatement" ||
+          firstStm.expression.type != "AssignmentExpression" ||
+          firstStm.expression.right.type != "CallExpression" ||
+          firstStm.expression.right.callee.type != "MemberExpression" ||
+          firstStm.expression.right.callee.property.type != "Identifier" ||
+          !methods.includes(firstStm.expression.right.callee.property.name)
+        ) {
+          return;
+        }
+
+        context.report({
+          node,
+          message: "provide a default value instead of using a try/catch block",
+        });
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-includes-instead-of-indexOf.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-includes-instead-of-indexOf.js
new file mode 100644
index 0000000000..99a04bbb72
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-includes-instead-of-indexOf.js
@@ -0,0 +1,50 @@
+/**
+ * @fileoverview Use .includes instead of .indexOf
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/use-includes-instead-of-indexOf.html",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      BinaryExpression(node) {
+        if (
+          node.left.type != "CallExpression" ||
+          node.left.callee.type != "MemberExpression" ||
+          node.left.callee.property.type != "Identifier" ||
+          node.left.callee.property.name != "indexOf"
+        ) {
+          return;
+        }
+
+        if (
+          (["!=", "!==", "==", "==="].includes(node.operator) &&
+            node.right.type == "UnaryExpression" &&
+            node.right.operator == "-" &&
+            node.right.argument.type == "Literal" &&
+            node.right.argument.value == 1) ||
+          ([">=", "<"].includes(node.operator) &&
+            node.right.type == "Literal" &&
+            node.right.value == 0)
+        ) {
+          context.report({
+            node,
+            message: "use .includes instead of .indexOf",
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-isInstance.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-isInstance.js
new file mode 100644
index 0000000000..5f8a8342fc
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-isInstance.js
@@ -0,0 +1,154 @@
+/**
+ * @fileoverview Reject use of instanceof against DOM interfaces
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const fs = require("fs");
+
+const { maybeGetMemberPropertyName } = require("../helpers");
+
+const privilegedGlobals = Object.keys(
+  require("../environments/privileged.js").globals
+);
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+/**
+ * Whether an identifier is defined by eslint configuration.
+ * `env: { browser: true }` or `globals: []` for example.
+ * @param {import("eslint-scope").Scope} currentScope
+ * @param {import("estree").Identifier} id
+ */
+function refersToEnvironmentGlobals(currentScope, id) {
+  const reference = currentScope.references.find(ref => ref.identifier === id);
+  const { resolved } = reference || {};
+  if (!resolved) {
+    return false;
+  }
+
+  // No definition in script files; defined via .eslintrc
+  return resolved.scope.type === "global" && resolved.defs.length === 0;
+}
+
+/**
+ * Whether a node points to a DOM interface.
+ * Includes direct references to interfaces objects and also indirect references
+ * via property access.
+ * OS.File and lazy.(Foo) are explicitly excluded.
+ *
+ * @example HTMLElement
+ * @example win.HTMLElement
+ * @example iframe.contentWindow.HTMLElement
+ * @example foo.HTMLElement
+ *
+ * @param {import("eslint-scope").Scope} currentScope
+ * @param {import("estree").Node} node
+ */
+function pointsToDOMInterface(currentScope, node) {
+  if (node.type === "MemberExpression") {
+    const objectName = maybeGetMemberPropertyName(node.object);
+    if (objectName === "lazy") {
+      // lazy.Foo is probably a non-IDL import.
+      return false;
+    }
+    if (objectName === "OS" && node.property.name === "File") {
+      // OS.File is an exception that is not a Web IDL interface
+      return false;
+    }
+    // For `win.Foo`, `iframe.contentWindow.Foo`, or such.
+    return privilegedGlobals.includes(node.property.name);
+  }
+
+  if (
+    node.type === "Identifier" &&
+    refersToEnvironmentGlobals(currentScope, node)
+  ) {
+    return privilegedGlobals.includes(node.name);
+  }
+
+  return false;
+}
+
+/**
+ * @param {import("eslint").Rule.RuleContext} context
+ */
+function isChromeContext(context) {
+  const filename = context.getFilename();
+  const isChromeFileName =
+    filename.endsWith(".sys.mjs") ||
+    filename.endsWith(".jsm") ||
+    filename.endsWith(".jsm.js");
+  if (isChromeFileName) {
+    return true;
+  }
+
+  if (filename.endsWith(".xhtml")) {
+    // Treat scripts in XUL files as chrome scripts
+    // Note: readFile is needed as getSourceCode() only gives JS blocks
+    return fs.readFileSync(filename).includes("there.is.only.xul");
+  }
+
+  // Treat scripts as chrome privileged when using:
+  // 1. ChromeUtils, but not SpecialPowers.ChromeUtils
+  // 2. BrowserTestUtils, PlacesUtils
+  // 3. document.createXULElement
+  // 4. loader.lazyRequireGetter
+  // 5. Services.foo, but not SpecialPowers.Services.foo
+  // 6. evalInSandbox
+  const source = context.getSourceCode().text;
+  return !!source.match(
+    /(^|\s)ChromeUtils|BrowserTestUtils|PlacesUtils|createXULElement|lazyRequireGetter|(^|\s)Services\.|evalInSandbox/
+  );
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/use-isInstance.html",
+    },
+    fixable: "code",
+    schema: [],
+    type: "problem",
+  },
+  /**
+   * @param {import("eslint").Rule.RuleContext} context
+   */
+  create(context) {
+    if (!isChromeContext(context)) {
+      return {};
+    }
+
+    return {
+      BinaryExpression(node) {
+        const { operator, right } = node;
+        if (
+          operator === "instanceof" &&
+          pointsToDOMInterface(context.getScope(), right)
+        ) {
+          context.report({
+            node,
+            message:
+              "Please prefer .isInstance() in chrome scripts over the standard instanceof operator for DOM interfaces, " +
+              "since the latter will return false when the object is created from a different context.",
+            fix(fixer) {
+              const sourceCode = context.getSourceCode();
+              return fixer.replaceText(
+                node,
+                `${sourceCode.getText(right)}.isInstance(${sourceCode.getText(
+                  node.left
+                )})`
+              );
+            },
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-ownerGlobal.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-ownerGlobal.js
new file mode 100644
index 0000000000..a61440f579
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-ownerGlobal.js
@@ -0,0 +1,40 @@
+/**
+ * @fileoverview Require .ownerGlobal instead of .ownerDocument.defaultView.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/use-ownerGlobal.html",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      MemberExpression(node) {
+        if (
+          node.property.type != "Identifier" ||
+          node.property.name != "defaultView" ||
+          node.object.type != "MemberExpression" ||
+          node.object.property.type != "Identifier" ||
+          node.object.property.name != "ownerDocument"
+        ) {
+          return;
+        }
+
+        context.report({
+          node,
+          message: "use .ownerGlobal instead of .ownerDocument.defaultView",
+        });
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-returnValue.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-returnValue.js
new file mode 100644
index 0000000000..29722a4f49
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-returnValue.js
@@ -0,0 +1,41 @@
+/**
+ * @fileoverview Warn when idempotent methods are called and their return value is unused.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/use-returnValue.html",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      ExpressionStatement(node) {
+        if (
+          node.expression?.type != "CallExpression" ||
+          node.expression.callee?.type != "MemberExpression" ||
+          node.expression.callee.property?.type != "Identifier" ||
+          !["concat", "join", "slice"].includes(
+            node.expression.callee.property?.name
+          )
+        ) {
+          return;
+        }
+
+        context.report({
+          node,
+          message: `{Array/String}.${node.expression.callee.property.name} doesn't modify the instance in-place`,
+        });
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-services.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-services.js
new file mode 100644
index 0000000000..75118d59e8
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-services.js
@@ -0,0 +1,104 @@
+/**
+ * @fileoverview Require use of Services.* rather than getService.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+const helpers = require("../helpers");
+
+let servicesInterfaceMap = helpers.servicesData;
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/use-services.html",
+    },
+    // fixable: "code",
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        if (!node.callee || !node.callee.property) {
+          return;
+        }
+
+        if (
+          node.callee.property.type == "Identifier" &&
+          node.callee.property.name == "defineLazyServiceGetter" &&
+          node.arguments.length == 4 &&
+          node.arguments[3].type == "Literal" &&
+          node.arguments[3].value in servicesInterfaceMap
+        ) {
+          let serviceName = servicesInterfaceMap[node.arguments[3].value];
+
+          context.report({
+            node,
+            message: `Use Services.${serviceName} rather than defineLazyServiceGetter.`,
+          });
+          return;
+        }
+
+        if (
+          node.callee.property.type == "Identifier" &&
+          node.callee.property.name == "defineLazyServiceGetters" &&
+          node.arguments.length == 2 &&
+          node.arguments[1].type == "ObjectExpression"
+        ) {
+          for (let property of node.arguments[1].properties) {
+            if (
+              property.value.type == "ArrayExpression" &&
+              property.value.elements.length == 2 &&
+              property.value.elements[1].value in servicesInterfaceMap
+            ) {
+              let serviceName =
+                servicesInterfaceMap[property.value.elements[1].value];
+
+              context.report({
+                node: property.value,
+                message: `Use Services.${serviceName} rather than defineLazyServiceGetters.`,
+              });
+            }
+          }
+          return;
+        }
+
+        if (
+          node.callee.property.type != "Identifier" ||
+          node.callee.property.name != "getService" ||
+          node.arguments.length != 1 ||
+          !node.arguments[0].property ||
+          node.arguments[0].property.type != "Identifier" ||
+          !node.arguments[0].property.name ||
+          !(node.arguments[0].property.name in servicesInterfaceMap)
+        ) {
+          return;
+        }
+
+        let serviceName = servicesInterfaceMap[node.arguments[0].property.name];
+        context.report({
+          node,
+          message: `Use Services.${serviceName} rather than getService().`,
+          // This is not enabled by default as for mochitest plain tests we
+          // would need to replace with `SpecialPowers.Services.${serviceName}`.
+          // At the moment we do not have an easy way to detect that.
+          // fix(fixer) {
+          //   let sourceCode = context.getSourceCode();
+          //   return fixer.replaceTextRange(
+          //     [
+          //       sourceCode.getFirstToken(node.callee).range[0],
+          //       sourceCode.getLastToken(node).range[1],
+          //     ],
+          //     `Services.${serviceName}`
+          //   );
+          // },
+        });
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-static-import.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-static-import.js
new file mode 100644
index 0000000000..8b68eca867
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-static-import.js
@@ -0,0 +1,87 @@
+/**
+ * @fileoverview Require use of static imports where possible.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const helpers = require("../helpers");
+
+function isIdentifier(node, id) {
+  return node && node.type === "Identifier" && node.name === id;
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/use-static-import.html",
+    },
+    fixable: "code",
+    messages: {
+      useStaticImport:
+        "Please use static import instead of ChromeUtils.importESModule",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      VariableDeclarator(node) {
+        if (
+          node.init?.type != "CallExpression" ||
+          node.init?.callee?.type != "MemberExpression" ||
+          !context.getFilename().endsWith(".sys.mjs") ||
+          !helpers.isTopLevel(context.getAncestors())
+        ) {
+          return;
+        }
+
+        let callee = node.init.callee;
+
+        if (
+          isIdentifier(callee.object, "ChromeUtils") &&
+          isIdentifier(callee.property, "importESModule") &&
+          callee.parent.arguments.length == 1
+        ) {
+          let sourceCode = context.getSourceCode();
+          let importItemSource;
+          if (node.id.type != "ObjectPattern") {
+            importItemSource = sourceCode.getText(node.id);
+          } else {
+            importItemSource = "{ ";
+            let initial = true;
+            for (let property of node.id.properties) {
+              if (!initial) {
+                importItemSource += ", ";
+              }
+              initial = false;
+              if (property.key.name == property.value.name) {
+                importItemSource += property.key.name;
+              } else {
+                importItemSource += `${property.key.name} as ${property.value.name}`;
+              }
+            }
+            importItemSource += " }";
+          }
+
+          context.report({
+            node: node.parent,
+            messageId: "useStaticImport",
+            fix(fixer) {
+              return fixer.replaceText(
+                node.parent,
+                `import ${importItemSource} from ${sourceCode.getText(
+                  callee.parent.arguments[0]
+                )}`
+              );
+            },
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/valid-ci-uses.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/valid-ci-uses.js
new file mode 100644
index 0000000000..e88a333cda
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/valid-ci-uses.js
@@ -0,0 +1,167 @@
+/**
+ * @fileoverview Reject uses of unknown interfaces on Ci and properties of those
+ * interfaces.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const os = require("os");
+const helpers = require("../helpers");
+
+// These interfaces are all platform specific, so may be not present
+// on all platforms.
+const platformSpecificInterfaces = new Map([
+  ["nsIAboutThirdParty", "windows"],
+  ["nsIAboutWindowsMessages", "windows"],
+  ["nsIJumpListItem", "windows"],
+  ["nsIJumpListLink", "windows"],
+  ["nsIJumpListSeparator", "windows"],
+  ["nsIJumpListShortcut", "windows"],
+  ["nsITaskbarWindowPreview", "windows"],
+  ["nsIWindowsAlertsService", "windows"],
+  ["nsIWinAppHelper", "windows"],
+  ["nsIWinTaskbar", "windows"],
+  ["nsIWinTaskSchedulerService", "windows"],
+  ["nsIWindowsRegKey", "windows"],
+  ["nsIWindowsPackageManager", "windows"],
+  ["nsIWindowsShellService", "windows"],
+  ["nsIAccessibleMacEvent", "darwin"],
+  ["nsIAccessibleMacInterface", "darwin"],
+  ["nsILocalFileMac", "darwin"],
+  ["nsIAccessibleMacEvent", "darwin"],
+  ["nsIMacAttributionService", "darwin"],
+  ["nsIMacShellService", "darwin"],
+  ["nsIMacDockSupport", "darwin"],
+  ["nsIMacFinderProgress", "darwin"],
+  ["nsIMacPreferencesReader", "darwin"],
+  ["nsIMacSharingService", "darwin"],
+  ["nsIMacUserActivityUpdater", "darwin"],
+  ["nsIMacWebAppUtils", "darwin"],
+  ["nsIStandaloneNativeMenu", "darwin"],
+  ["nsITouchBarHelper", "darwin"],
+  ["nsITouchBarInput", "darwin"],
+  ["nsITouchBarUpdater", "darwin"],
+  ["mozISandboxReporter", "linux"],
+  ["nsIApplicationChooser", "linux"],
+  ["nsIGNOMEShellService", "linux"],
+  ["nsIGtkTaskbarProgress", "linux"],
+
+  // These are used in the ESLint test code.
+  ["amIFoo", "any"],
+  ["nsIMeh", "any"],
+  // Can't easily detect android builds from ESLint at the moment.
+  ["nsIAndroidBridge", "any"],
+  ["nsIAndroidView", "any"],
+  // Code coverage is enabled only for certain builds (MOZ_CODE_COVERAGE).
+  ["nsICodeCoverage", "any"],
+  // Layout debugging is enabled only for certain builds (MOZ_LAYOUT_DEBUGGER).
+  ["nsILayoutDebuggingTools", "any"],
+  // Sandbox test is only enabled for certain configurations (MOZ_SANDBOX,
+  // MOZ_DEBUG, ENABLE_TESTS).
+  ["mozISandboxTest", "any"],
+]);
+
+function interfaceHasProperty(interfaceName, propertyName) {
+  // `Ci.nsIFoo.number` is valid, it returns the iid.
+  if (propertyName == "number") {
+    return true;
+  }
+
+  let interfaceInfo = helpers.xpidlData.get(interfaceName);
+
+  if (!interfaceInfo) {
+    return true;
+  }
+
+  // If the property is not in the lists of consts for this interface, check
+  // any parents as well.
+  if (!interfaceInfo.consts.find(e => e.name === propertyName)) {
+    if (interfaceInfo.parent && interfaceInfo.parent != "nsISupports") {
+      return interfaceHasProperty(interfaceName.parent, propertyName);
+    }
+    return false;
+  }
+  return true;
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/valid-ci-uses.html",
+    },
+    messages: {
+      missingInterface:
+        "{{ interface }} is defined in this rule's platform specific list, but is not available",
+      unknownInterface: "Use of unknown interface Ci.{{ interface}}",
+      unknownProperty:
+        "Use of unknown property Ci.{{ interface }}.{{ property }}",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      MemberExpression(node) {
+        if (
+          node.computed === false &&
+          node.type === "MemberExpression" &&
+          node.object.type === "Identifier" &&
+          node.object.name === "Ci" &&
+          node.property.type === "Identifier" &&
+          node.property.name.includes("I")
+        ) {
+          if (!helpers.xpidlData.get(node.property.name)) {
+            let platformSpecific = platformSpecificInterfaces.get(
+              node.property.name
+            );
+            if (!platformSpecific) {
+              context.report({
+                node,
+                messageId: "unknownInterface",
+                data: {
+                  interface: node.property.name,
+                },
+              });
+            } else if (platformSpecific == os.platform) {
+              context.report({
+                node,
+                messageId: "missingInterface",
+                data: {
+                  interface: node.property.name,
+                },
+              });
+            }
+          }
+        }
+
+        if (
+          node.computed === false &&
+          node.object.type === "MemberExpression" &&
+          node.object.object.type === "Identifier" &&
+          node.object.object.name === "Ci" &&
+          node.object.property.type === "Identifier" &&
+          node.object.property.name.includes("I") &&
+          node.property.type === "Identifier"
+        ) {
+          if (
+            !interfaceHasProperty(node.object.property.name, node.property.name)
+          ) {
+            context.report({
+              node,
+              messageId: "unknownProperty",
+              data: {
+                interface: node.object.property.name,
+                property: node.property.name,
+              },
+            });
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/valid-lazy.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/valid-lazy.js
new file mode 100644
index 0000000000..52ad4ce7d5
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/valid-lazy.js
@@ -0,0 +1,221 @@
+/**
+ * @fileoverview Ensures that definitions and uses of properties on the
+ * ``lazy`` object are valid.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+const helpers = require("../helpers");
+
+const items = [
+  "loader",
+  "XPCOMUtils",
+  "Integration",
+  "ChromeUtils",
+  "DevToolsUtils",
+  "Object",
+  "Reflect",
+];
+
+const callExpressionDefinitions = [
+  /^loader\.lazyGetter\(lazy, "(\w+)"/,
+  /^loader\.lazyServiceGetter\(lazy, "(\w+)"/,
+  /^loader\.lazyRequireGetter\(lazy, "(\w+)"/,
+  /^XPCOMUtils\.defineLazyGetter\(lazy, "(\w+)"/,
+  /^Integration\.downloads\.defineESModuleGetter\(lazy, "(\w+)"/,
+  /^XPCOMUtils\.defineLazyModuleGetter\(lazy, "(\w+)"/,
+  /^ChromeUtils\.defineLazyGetter\(lazy, "(\w+)"/,
+  /^ChromeUtils\.defineModuleGetter\(lazy, "(\w+)"/,
+  /^XPCOMUtils\.defineLazyPreferenceGetter\(lazy, "(\w+)"/,
+  /^XPCOMUtils\.defineLazyProxy\(lazy, "(\w+)"/,
+  /^XPCOMUtils\.defineLazyScriptGetter\(lazy, "(\w+)"/,
+  /^XPCOMUtils\.defineLazyServiceGetter\(lazy, "(\w+)"/,
+  /^XPCOMUtils\.defineConstant\(lazy, "(\w+)"/,
+  /^DevToolsUtils\.defineLazyModuleGetter\(lazy, "(\w+)"/,
+  /^DevToolsUtils\.defineLazyGetter\(lazy, "(\w+)"/,
+  /^Object\.defineProperty\(lazy, "(\w+)"/,
+  /^Reflect\.defineProperty\(lazy, "(\w+)"/,
+];
+
+const callExpressionMultiDefinitions = [
+  "ChromeUtils.defineESModuleGetters(lazy,",
+  "XPCOMUtils.defineLazyModuleGetters(lazy,",
+  "XPCOMUtils.defineLazyServiceGetters(lazy,",
+  "Object.defineProperties(lazy,",
+  "loader.lazyRequireGetter(lazy,",
+];
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/valid-lazy.html",
+    },
+    messages: {
+      duplicateSymbol: "Duplicate symbol {{name}} being added to lazy.",
+      incorrectType: "Unexpected literal for property name {{name}}",
+      unknownProperty: "Unknown lazy member property {{name}}",
+      unusedProperty: "Unused lazy property {{name}}",
+      topLevelAndUnconditional:
+        "Lazy property {{name}} is used at top-level unconditionally. It should be non-lazy.",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    let lazyProperties = new Map();
+    let unknownProperties = [];
+
+    function addProp(node, name) {
+      if (lazyProperties.has(name)) {
+        context.report({
+          node,
+          messageId: "duplicateSymbol",
+          data: { name },
+        });
+        return;
+      }
+      lazyProperties.set(name, { used: false, node });
+    }
+
+    function setPropertiesFromArgument(node, arg) {
+      if (arg.type === "ObjectExpression") {
+        for (let prop of arg.properties) {
+          if (prop.key.type == "Literal") {
+            context.report({
+              node,
+              messageId: "incorrectType",
+              data: { name: prop.key.value },
+            });
+            continue;
+          }
+          addProp(node, prop.key.name);
+        }
+      } else if (arg.type === "ArrayExpression") {
+        for (let prop of arg.elements) {
+          if (prop.type != "Literal") {
+            continue;
+          }
+          addProp(node, prop.value);
+        }
+      }
+    }
+
+    return {
+      VariableDeclarator(node) {
+        if (
+          node.id.type === "Identifier" &&
+          node.id.name == "lazy" &&
+          node.init.type == "CallExpression" &&
+          node.init.callee.name == "createLazyLoaders"
+        ) {
+          setPropertiesFromArgument(node, node.init.arguments[0]);
+        }
+      },
+
+      CallExpression(node) {
+        if (
+          node.callee.type != "MemberExpression" ||
+          (node.callee.object.type == "MemberExpression" &&
+            !items.includes(node.callee.object.object.name)) ||
+          (node.callee.object.type != "MemberExpression" &&
+            !items.includes(node.callee.object.name))
+        ) {
+          return;
+        }
+
+        let source;
+        try {
+          source = helpers.getASTSource(node);
+        } catch (e) {
+          return;
+        }
+
+        for (let reg of callExpressionDefinitions) {
+          let match = source.match(reg);
+          if (match) {
+            if (lazyProperties.has(match[1])) {
+              context.report({
+                node,
+                messageId: "duplicateSymbol",
+                data: { name: match[1] },
+              });
+              return;
+            }
+            lazyProperties.set(match[1], { used: false, node });
+            break;
+          }
+        }
+
+        if (
+          callExpressionMultiDefinitions.some(expr =>
+            source.startsWith(expr)
+          ) &&
+          node.arguments[1]
+        ) {
+          setPropertiesFromArgument(node, node.arguments[1]);
+        }
+      },
+
+      MemberExpression(node) {
+        if (node.computed || node.object.type !== "Identifier") {
+          return;
+        }
+
+        let name;
+        if (node.object.name == "lazy") {
+          name = node.property.name;
+        } else {
+          return;
+        }
+        let property = lazyProperties.get(name);
+        if (!property) {
+          // These will be reported on Program:exit - some definitions may
+          // be after first use, so we need to wait until we've processed
+          // the whole file before reporting.
+          unknownProperties.push({ name, node });
+        } else {
+          property.used = true;
+        }
+        if (
+          helpers.getIsTopLevelAndUnconditionallyExecuted(
+            context.getAncestors()
+          )
+        ) {
+          context.report({
+            node,
+            messageId: "topLevelAndUnconditional",
+            data: { name },
+          });
+        }
+      },
+
+      "Program:exit": function () {
+        for (let { name, node } of unknownProperties) {
+          let property = lazyProperties.get(name);
+          if (!property) {
+            context.report({
+              node,
+              messageId: "unknownProperty",
+              data: { name },
+            });
+          } else {
+            property.used = true;
+          }
+        }
+        for (let [name, property] of lazyProperties.entries()) {
+          if (!property.used) {
+            context.report({
+              node: property.node,
+              messageId: "unusedProperty",
+              data: { name },
+            });
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/valid-services-property.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/valid-services-property.js
new file mode 100644
index 0000000000..d0a8b2710a
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/valid-services-property.js
@@ -0,0 +1,126 @@
+/**
+ * @fileoverview Ensures that property accesses on Services.<alias> are valid.
+ * Although this largely duplicates the valid-services rule, the checks here
+ * require an objdir and a manual run.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const helpers = require("../helpers");
+
+function findInterfaceNames(name) {
+  let interfaces = [];
+  for (let [key, value] of Object.entries(helpers.servicesData)) {
+    if (value == name) {
+      interfaces.push(key);
+    }
+  }
+  return interfaces;
+}
+
+function isInInterface(interfaceName, name) {
+  let interfaceDetails = helpers.xpidlData.get(interfaceName);
+
+  // TODO: Bug 1790261 - check only methods if the expression is callable.
+  if (interfaceDetails.methods.some(m => m.name == name)) {
+    return true;
+  }
+
+  if (interfaceDetails.consts.some(c => c.name == name)) {
+    return true;
+  }
+
+  if (interfaceDetails.parent) {
+    return isInInterface(interfaceDetails.parent, name);
+  }
+  return false;
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/valid-services-property.html",
+    },
+    messages: {
+      unknownProperty:
+        "Unknown property access Services.{{ alias }}.{{ propertyName }}, Interfaces: {{ checkedInterfaces }}",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    let servicesInterfaceMap = helpers.servicesData;
+    let serviceAliases = new Set([
+      ...Object.values(servicesInterfaceMap),
+      // This is defined only for Android, so most builds won't pick it up.
+      "androidBridge",
+      // These are defined without interfaces and hence are not in the services map.
+      "cpmm",
+      "crashmanager",
+      "mm",
+      "ppmm",
+      // The new xulStore also does not have an interface.
+      "xulStore",
+    ]);
+    return {
+      MemberExpression(node) {
+        if (node.computed || node.object.type !== "Identifier") {
+          return;
+        }
+
+        let mainNode;
+        if (node.object.name == "Services") {
+          mainNode = node;
+        } else if (
+          node.property.name == "Services" &&
+          node.parent.type == "MemberExpression"
+        ) {
+          mainNode = node.parent;
+        } else {
+          return;
+        }
+
+        let alias = mainNode.property.name;
+        if (!serviceAliases.has(alias)) {
+          return;
+        }
+
+        if (
+          mainNode.parent.type == "MemberExpression" &&
+          !mainNode.parent.computed
+        ) {
+          let propertyName = mainNode.parent.property.name;
+          if (propertyName == "wrappedJSObject") {
+            return;
+          }
+          let interfaces = findInterfaceNames(alias);
+          if (!interfaces.length) {
+            return;
+          }
+
+          let checkedInterfaces = [];
+          for (let item of interfaces) {
+            if (isInInterface(item, propertyName)) {
+              return;
+            }
+            checkedInterfaces.push(item);
+          }
+          context.report({
+            node,
+            messageId: "unknownProperty",
+            data: {
+              alias,
+              propertyName,
+              checkedInterfaces,
+            },
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/valid-services.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/valid-services.js
new file mode 100644
index 0000000000..eb28087fe9
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/valid-services.js
@@ -0,0 +1,62 @@
+/**
+ * @fileoverview Ensures that Services uses have valid property names.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+const helpers = require("../helpers");
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/valid-services.html",
+    },
+    schema: [],
+    type: "problem",
+  },
+
+  create(context) {
+    let servicesInterfaceMap = helpers.servicesData;
+    let serviceAliases = new Set([
+      ...Object.values(servicesInterfaceMap),
+      // This is defined only for Android, so most builds won't pick it up.
+      "androidBridge",
+      // These are defined without interfaces and hence are not in the services map.
+      "cpmm",
+      "crashmanager",
+      "mm",
+      "ppmm",
+      // The new xulStore also does not have an interface.
+      "xulStore",
+    ]);
+    return {
+      MemberExpression(node) {
+        if (node.computed || node.object.type !== "Identifier") {
+          return;
+        }
+
+        let alias;
+        if (node.object.name == "Services") {
+          alias = node.property.name;
+        } else if (
+          node.property.name == "Services" &&
+          node.parent.type == "MemberExpression"
+        ) {
+          alias = node.parent.property.name;
+        } else {
+          return;
+        }
+
+        if (!serviceAliases.has(alias)) {
+          context.report({
+            node,
+            message: `Unknown Services member property ${alias}`,
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/var-only-at-top-level.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/var-only-at-top-level.js
new file mode 100644
index 0000000000..64c7298d1f
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/var-only-at-top-level.js
@@ -0,0 +1,39 @@
+/**
+ * @fileoverview Marks all var declarations that are not at the top level
+ *               invalid.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var helpers = require("../helpers");
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/var-only-at-top-level.html",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      VariableDeclaration(node) {
+        if (node.kind === "var") {
+          if (helpers.getIsTopLevelScript(context.getAncestors())) {
+            return;
+          }
+
+          context.report({
+            node,
+            message: "Unexpected var, use let or const instead.",
+          });
+        }
+      },
+    };
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/services.json b/tools/lint/eslint/eslint-plugin-mozilla/lib/services.json
new file mode 100644
index 0000000000..91442fdda3
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/services.json
@@ -0,0 +1,62 @@
+{
+  "mozIJSSubScriptLoader": "scriptloader",
+  "mozILocaleService": "locale",
+  "mozIMozIntl": "intl",
+  "mozIStorageService": "storage",
+  "nsIAppShellService": "appShell",
+  "nsIAppStartup": "startup",
+  "nsIBlocklistService": "blocklist",
+  "nsICacheStorageService": "cache2",
+  "nsICategoryManager": "catMan",
+  "nsIClearDataService": "clearData",
+  "nsIClipboard": "clipboard",
+  "nsIConsoleService": "console",
+  "nsICookieBannerService": "cookieBanners",
+  "nsICookieManager": "cookies",
+  "nsICookieService": "cookies",
+  "nsICrashReporter": "appinfo",
+  "nsIDAPTelemetry": "DAPTelemetry",
+  "nsIDOMRequestService": "DOMRequest",
+  "nsIDOMStorageManager": "domStorageManager",
+  "nsIDNSService": "dns",
+  "nsIDirectoryService": "dirsvc",
+  "nsIDroppedLinkHandler": "droppedLinkHandler",
+  "nsIEffectiveTLDService": "eTLD",
+  "nsIEnterprisePolicies": "policies",
+  "nsIEnvironment": "env",
+  "nsIEventListenerService": "els",
+  "nsIFOG": "fog",
+  "nsIFocusManager": "focus",
+  "nsIIOService": "io",
+  "nsILoadContextInfoFactory": "loadContextInfo",
+  "nsILocalStorageManager": "domStorageManager",
+  "nsILoginManager": "logins",
+  "nsINetUtil": "io",
+  "nsIObserverService": "obs",
+  "nsIPermissionManager": "perms",
+  "nsIPrefBranch": "prefs",
+  "nsIPrefService": "prefs",
+  "nsIProfiler": "profiler",
+  "nsIPromptService": "prompt",
+  "nsIProperties": "dirsvc",
+  "nsIPropertyBag2": "sysinfo",
+  "nsIQuotaManagerService": "qms",
+  "nsIScriptSecurityManager": "scriptSecurityManager",
+  "nsISearchService": "search",
+  "nsISessionStorageService": "sessionStorage",
+  "nsISpeculativeConnect": "io",
+  "nsIStringBundleService": "strings",
+  "nsISystemInfo": "sysinfo",
+  "nsITelemetry": "telemetry",
+  "nsITextToSubURI": "textToSubURI",
+  "nsIThreadManager": "tm",
+  "nsIURIFixup": "uriFixup",
+  "nsIURLFormatter": "urlFormatter",
+  "nsIUUIDGenerator": "uuid",
+  "nsIVersionComparator": "vc",
+  "nsIWindowMediator": "wm",
+  "nsIWindowWatcher": "ww",
+  "nsIXULAppInfo": "appinfo",
+  "nsIXULRuntime": "appinfo",
+  "nsIXULStore": "xulStore"
+}
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/manifest.tt b/tools/lint/eslint/eslint-plugin-mozilla/manifest.tt
new file mode 100644
index 0000000000..cf5c97c6d8
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/manifest.tt
@@ -0,0 +1,10 @@
+[
+  {
+    "filename": "eslint-plugin-mozilla.tar.gz",
+    "size": 9278498,
+    "algorithm": "sha512",
+    "digest": "01615c6a29c0027fabe528d9a6e2133b80467e0e0c420bab3a282dea3c8de1fd59c44dab0fcdb19c09e72c7d0d7e81347029336e77b4463a8c09272876da10a8",
+    "unpack": true,
+    "visibility": "public"
+  }
+]
\ No newline at end of file
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/package-lock.json b/tools/lint/eslint/eslint-plugin-mozilla/package-lock.json
new file mode 100644
index 0000000000..4f6ce8e780
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/package-lock.json
@@ -0,0 +1,6924 @@
+{
+  "name": "eslint-plugin-mozilla",
+  "version": "3.1.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "eslint-plugin-mozilla",
+      "version": "3.1.0",
+      "license": "MPL-2.0",
+      "dependencies": {
+        "@babel/core": "^7.20.12",
+        "@babel/eslint-parser": "^7.19.1",
+        "eslint-scope": "^7.1.1",
+        "eslint-visitor-keys": "^3.3.0",
+        "estraverse": "^5.3.0",
+        "htmlparser2": "^8.0.1",
+        "multi-ini": "^2.3.2"
+      },
+      "devDependencies": {
+        "eslint": "8.38.0",
+        "mocha": "10.2.0"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      },
+      "peerDependencies": {
+        "@microsoft/eslint-plugin-sdl": "github:mozfreddyb/eslint-plugin-sdl#17b22cd527682108af7a1a4edacf69cb7a9b4a06",
+        "eslint": "^7.23.0 || ^8.0.0",
+        "eslint-config-prettier": "^8.0.0",
+        "eslint-plugin-fetch-options": "^0.0.5",
+        "eslint-plugin-html": "^7.0.0",
+        "eslint-plugin-no-unsanitized": "^4.0.0"
+      }
+    },
+    "node_modules/@ampproject/remapping": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/@ampproject/remapping/-/remapping-2.2.1.tgz",
+      "integrity": "sha512-lFMjJTrFL3j7L9yBxwYfCq2k6qqwHyzuUl/XBnif78PWTJYyL/dfowQHWE3sp6U6ZzqWiiIZnpTMO96zhkjwtg==",
+      "dependencies": {
+        "@jridgewell/gen-mapping": "^0.3.0",
+        "@jridgewell/trace-mapping": "^0.3.9"
+      },
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
+    "node_modules/@babel/code-frame": {
+      "version": "7.21.4",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.21.4.tgz",
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+      "dependencies": {
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+    "node_modules/@babel/compat-data": {
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+    },
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+        "strip-ansi": "^6.0.0"
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+          "dev": true,
+          "requires": {
+            "color-convert": "^2.0.1"
+          }
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+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+          "dev": true,
+          "requires": {
+            "color-name": "~1.1.4"
+          }
+        },
+        "color-name": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+          "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+          "dev": true
+        }
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
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+    },
+    "y18n": {
+      "version": "5.0.8",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
+      "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==",
+      "dev": true
+    },
+    "yallist": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
+      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g=="
+    },
+    "yargs": {
+      "version": "16.2.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-16.2.0.tgz",
+      "integrity": "sha512-D1mvvtDG0L5ft/jGWkLpG1+m0eQxOfaBvTNELraWj22wSVUMWxZUvYgJYcKh6jGGIkJFhH4IZPQhR4TKpc8mBw==",
+      "dev": true,
+      "requires": {
+        "cliui": "^7.0.2",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
+        "require-directory": "^2.1.1",
+        "string-width": "^4.2.0",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^20.2.2"
+      }
+    },
+    "yargs-parser": {
+      "version": "20.2.4",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.4.tgz",
+      "integrity": "sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA==",
+      "dev": true
+    },
+    "yargs-unparser": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-2.0.0.tgz",
+      "integrity": "sha512-7pRTIA9Qc1caZ0bZ6RYRGbHJthJWuakf+WmHK0rVeLkNrrGhfoabBNdue6kdINI6r4if7ocq9aD/n7xwKOdzOA==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^6.0.0",
+        "decamelize": "^4.0.0",
+        "flat": "^5.0.2",
+        "is-plain-obj": "^2.1.0"
+      }
+    },
+    "yocto-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q=="
+    }
+  }
+}
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/package.json b/tools/lint/eslint/eslint-plugin-mozilla/package.json
new file mode 100644
index 0000000000..8d9525b6da
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/package.json
@@ -0,0 +1,53 @@
+{
+  "name": "eslint-plugin-mozilla",
+  "version": "3.1.0",
+  "description": "A collection of rules that help enforce JavaScript coding standard in the Mozilla project.",
+  "keywords": [
+    "eslint",
+    "eslintplugin",
+    "eslint-plugin",
+    "mozilla",
+    "firefox"
+  ],
+  "bugs": {
+    "url": "https://bugzilla.mozilla.org/enter_bug.cgi?product=Testing&component=Lint"
+  },
+  "homepage": "http://firefox-source-docs.mozilla.org/tools/lint/linters/eslint-plugin-mozilla.html",
+  "repository": {
+    "type": "hg",
+    "url": "https://hg.mozilla.org/mozilla-central/"
+  },
+  "author": "Mike Ratcliffe",
+  "main": "lib/index.js",
+  "dependencies": {
+    "@babel/core": "^7.20.12",
+    "@babel/eslint-parser": "^7.19.1",
+    "eslint-scope": "^7.1.1",
+    "eslint-visitor-keys": "^3.3.0",
+    "estraverse": "^5.3.0",
+    "htmlparser2": "^8.0.1",
+    "multi-ini": "^2.3.2"
+  },
+  "devDependencies": {
+    "eslint": "8.38.0",
+    "mocha": "10.2.0"
+  },
+  "peerDependencies": {
+    "@microsoft/eslint-plugin-sdl": "github:mozfreddyb/eslint-plugin-sdl#17b22cd527682108af7a1a4edacf69cb7a9b4a06",
+    "eslint": "^7.23.0 || ^8.0.0",
+    "eslint-config-prettier": "^8.0.0",
+    "eslint-plugin-fetch-options": "^0.0.5",
+    "eslint-plugin-html": "^7.0.0",
+    "eslint-plugin-no-unsanitized": "^4.0.0"
+  },
+  "engines": {
+    "node": ">=14.0.0"
+  },
+  "scripts": {
+    "prepack": "node scripts/createExports.js",
+    "test": "mocha --reporter 'reporters/mozilla-format.js' tests",
+    "postpublish": "rm -f lib/environments/saved-globals.json lib/rules/saved-rules-data.json",
+    "update-tooltool": "./update.sh"
+  },
+  "license": "MPL-2.0"
+}
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/reporters/mozilla-format.js b/tools/lint/eslint/eslint-plugin-mozilla/reporters/mozilla-format.js
new file mode 100644
index 0000000000..a3f96e7bef
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/reporters/mozilla-format.js
@@ -0,0 +1,57 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * This file outputs the format that treeherder requires. If we integrate
+ * these tests with ./mach, then we may replace this with a json handler within
+ * mach itself.
+ */
+
+"use strict";
+
+var mocha = require("mocha");
+var path = require("path");
+module.exports = MozillaFormatter;
+
+function MozillaFormatter(runner) {
+  mocha.reporters.Base.call(this, runner);
+  var passes = 0;
+  var failures = [];
+
+  runner.on("start", () => {
+    console.log("SUITE-START | eslint-plugin-mozilla");
+  });
+
+  runner.on("pass", function (test) {
+    passes++;
+    let title = test.title.replace(/\n/g, "|");
+    console.log(`TEST-PASS | ${path.basename(test.file)} | ${title}`);
+  });
+
+  runner.on("fail", function (test, err) {
+    failures.push(test);
+    // Replace any newlines in the title.
+    let title = test.title.replace(/\n/g, "|");
+    console.log(
+      `TEST-UNEXPECTED-FAIL | ${path.basename(test.file)} | ${title} | ${
+        err.message
+      }`
+    );
+    mocha.reporters.Base.list([test]);
+  });
+
+  runner.on("end", function () {
+    // Space the results out visually with an additional blank line.
+    console.log("");
+    console.log("INFO | Result summary:");
+    console.log(`INFO | Passed: ${passes}`);
+    console.log(`INFO | Failed: ${failures.length}`);
+    console.log("SUITE-END");
+    // Space the failures out visually with an additional blank line.
+    console.log("");
+    console.log("Failure summary:");
+    mocha.reporters.Base.list(failures);
+    process.exit(failures.length);
+  });
+}
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/scripts/createExports.js b/tools/lint/eslint/eslint-plugin-mozilla/scripts/createExports.js
new file mode 100644
index 0000000000..7f839edfba
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/scripts/createExports.js
@@ -0,0 +1,77 @@
+/**
+ * @fileoverview A script to export the known globals to a file.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+"use strict";
+
+var fs = require("fs");
+var path = require("path");
+var helpers = require("../lib/helpers");
+
+const eslintDir = path.join(helpers.rootDir, "tools", "lint", "eslint");
+
+const globalsFile = path.join(
+  eslintDir,
+  "eslint-plugin-mozilla",
+  "lib",
+  "environments",
+  "saved-globals.json"
+);
+const rulesFile = path.join(
+  eslintDir,
+  "eslint-plugin-mozilla",
+  "lib",
+  "rules",
+  "saved-rules-data.json"
+);
+
+console.log("Copying services.json");
+
+const env = helpers.getBuildEnvironment();
+
+const servicesFile = path.join(
+  env.topobjdir,
+  "xpcom",
+  "components",
+  "services.json"
+);
+const shipServicesFile = path.join(
+  eslintDir,
+  "eslint-plugin-mozilla",
+  "lib",
+  "services.json"
+);
+
+fs.writeFileSync(shipServicesFile, fs.readFileSync(servicesFile));
+
+console.log("Generating globals file");
+
+// Export the environments.
+let environmentGlobals = require("../lib/index.js").environments;
+
+return fs.writeFile(
+  globalsFile,
+  JSON.stringify({ environments: environmentGlobals }),
+  err => {
+    if (err) {
+      console.error(err);
+      process.exit(1);
+    }
+
+    console.log("Globals file generation complete");
+
+    console.log("Creating rules data file");
+    let rulesData = {};
+
+    return fs.writeFile(rulesFile, JSON.stringify({ rulesData }), err1 => {
+      if (err1) {
+        console.error(err1);
+        process.exit(1);
+      }
+
+      console.log("Globals file generation complete");
+    });
+  }
+);
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/avoid-Date-timing.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/avoid-Date-timing.js
new file mode 100644
index 0000000000..37fc424617
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/avoid-Date-timing.js
@@ -0,0 +1,34 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/avoid-Date-timing");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, type, message) {
+  return { code, errors: [{ messageId: "usePerfNow", type }] };
+}
+
+ruleTester.run("avoid-Date-timing", rule, {
+  valid: [
+    "new Date('2017-07-11');",
+    "new Date(1499790192440);",
+    "new Date(2017, 7, 11);",
+    "Date.UTC(2017, 7);",
+  ],
+  invalid: [
+    invalidCode("Date.now();", "CallExpression"),
+    invalidCode("new Date();", "NewExpression"),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/avoid-removeChild.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/avoid-removeChild.js
new file mode 100644
index 0000000000..3736f25853
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/avoid-removeChild.js
@@ -0,0 +1,37 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/avoid-removeChild");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, messageId = "useRemove") {
+  return { code, errors: [{ messageId, type: "CallExpression" }] };
+}
+
+ruleTester.run("avoid-removeChild", rule, {
+  valid: [
+    "elt.remove();",
+    "elt.parentNode.parentNode.removeChild(elt2.parentNode);",
+    "elt.parentNode.removeChild(elt2);",
+    "elt.removeChild(elt2);",
+  ],
+  invalid: [
+    invalidCode("elt.parentNode.removeChild(elt);"),
+    invalidCode("elt.parentNode.parentNode.removeChild(elt.parentNode);"),
+    invalidCode("$(e).parentNode.removeChild($(e));"),
+    invalidCode("$('e').parentNode.removeChild($('e'));"),
+    invalidCode("elt.removeChild(elt.firstChild);", "useFirstChildRemove"),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/balanced-listeners.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/balanced-listeners.js
new file mode 100644
index 0000000000..b7cd4e2c2f
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/balanced-listeners.js
@@ -0,0 +1,100 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/balanced-listeners");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function error(code, functionName, type) {
+  return {
+    code,
+    errors: [
+      {
+        messageId: "noCorresponding",
+        type: "Identifier",
+        data: { functionName, type },
+      },
+    ],
+  };
+}
+
+ruleTester.run("balanced-listeners", rule, {
+  valid: [
+    "elt.addEventListener('event', handler);" +
+      "elt.removeEventListener('event', handler);",
+
+    "elt.addEventListener('event', handler, true);" +
+      "elt.removeEventListener('event', handler, true);",
+
+    "elt.addEventListener('event', handler, false);" +
+      "elt.removeEventListener('event', handler, false);",
+
+    "elt.addEventListener('event', handler);" +
+      "elt.removeEventListener('event', handler, false);",
+
+    "elt.addEventListener('event', handler, false);" +
+      "elt.removeEventListener('event', handler);",
+
+    "elt.addEventListener('event', handler, {capture: false});" +
+      "elt.removeEventListener('event', handler);",
+
+    "elt.addEventListener('event', handler);" +
+      "elt.removeEventListener('event', handler, {capture: false});",
+
+    "elt.addEventListener('event', handler, {capture: true});" +
+      "elt.removeEventListener('event', handler, true);",
+
+    "elt.addEventListener('event', handler, true);" +
+      "elt.removeEventListener('event', handler, {capture: true});",
+
+    "elt.addEventListener('event', handler, {once: true});",
+
+    "elt.addEventListener('event', handler, {once: true, capture: true});",
+  ],
+  invalid: [
+    error(
+      "elt.addEventListener('click', handler, false);",
+      "removeEventListener",
+      "click"
+    ),
+
+    error(
+      "elt.addEventListener('click', handler, false);" +
+        "elt.removeEventListener('click', handler, true);",
+      "removeEventListener",
+      "click"
+    ),
+
+    error(
+      "elt.addEventListener('click', handler, {capture: false});" +
+        "elt.removeEventListener('click', handler, true);",
+      "removeEventListener",
+      "click"
+    ),
+
+    error(
+      "elt.addEventListener('click', handler, {capture: true});" +
+        "elt.removeEventListener('click', handler);",
+      "removeEventListener",
+      "click"
+    ),
+
+    error(
+      "elt.addEventListener('click', handler, true);" +
+        "elt.removeEventListener('click', handler);",
+      "removeEventListener",
+      "click"
+    ),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/balanced-observers.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/balanced-observers.js
new file mode 100644
index 0000000000..97e578a1f4
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/balanced-observers.js
@@ -0,0 +1,80 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/balanced-observers");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function error(code, observable) {
+  return {
+    code,
+    errors: [
+      {
+        messageId: "noCorresponding",
+        type: "Identifier",
+        data: { observable },
+      },
+    ],
+  };
+}
+
+ruleTester.run("balanced-observers", rule, {
+  valid: [
+    "Services.obs.addObserver(observer, 'observable');" +
+      "Services.obs.removeObserver(observer, 'observable');",
+    "Services.prefs.addObserver('preference.name', otherObserver);" +
+      "Services.prefs.removeObserver('preference.name', otherObserver);",
+  ],
+  invalid: [
+    error(
+      // missing Services.obs.removeObserver
+      "Services.obs.addObserver(observer, 'observable');",
+      "observable"
+    ),
+
+    error(
+      // wrong observable name for Services.obs.removeObserver
+      "Services.obs.addObserver(observer, 'observable');" +
+        "Services.obs.removeObserver(observer, 'different-observable');",
+      "observable"
+    ),
+
+    error(
+      // missing Services.prefs.removeObserver
+      "Services.prefs.addObserver('preference.name', otherObserver);",
+      "preference.name"
+    ),
+
+    error(
+      // wrong observable name for Services.prefs.removeObserver
+      "Services.prefs.addObserver('preference.name', otherObserver);" +
+        "Services.prefs.removeObserver('other.preference', otherObserver);",
+      "preference.name"
+    ),
+
+    error(
+      // mismatch Services.prefs vs Services.obs
+      "Services.obs.addObserver(observer, 'observable');" +
+        "Services.prefs.removeObserver(observer, 'observable');",
+      "observable"
+    ),
+
+    error(
+      "Services.prefs.addObserver('preference.name', otherObserver);" +
+        // mismatch Services.prefs vs Services.obs
+        "Services.obs.removeObserver('preference.name', otherObserver);",
+      "preference.name"
+    ),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/consistent-if-bracing.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/consistent-if-bracing.js
new file mode 100644
index 0000000000..9712fd9a78
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/consistent-if-bracing.js
@@ -0,0 +1,39 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/consistent-if-bracing");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code) {
+  return { code, errors: [{ messageId: "consistentIfBracing" }] };
+}
+
+ruleTester.run("consistent-if-bracing", rule, {
+  valid: [
+    "if (true) {1} else {0}",
+    "if (false) 1; else 0",
+    "if (true) {1} else if (true) {2} else {0}",
+    "if (true) {1} else if (true) {2} else if (true) {3} else {0}",
+  ],
+  invalid: [
+    invalidCode(`if (true) {1} else 0`),
+    invalidCode("if (true) 1; else {0}"),
+    invalidCode("if (true) {1} else if (true) 2; else {0}"),
+    invalidCode("if (true) 1; else if (true) {2} else {0}"),
+    invalidCode("if (true) {1} else if (true) {2} else 0"),
+    invalidCode("if (true) {1} else if (true) {2} else if (true) 3; else {0}"),
+    invalidCode("if (true) {if (true) 1; else {0}} else {0}"),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/globals.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/globals.js
new file mode 100644
index 0000000000..1098cb8a34
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/globals.js
@@ -0,0 +1,161 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+var { getGlobalsForCode } = require("../lib/globals");
+var assert = require("assert");
+
+/* global describe, it */
+
+describe("globals", function () {
+  it("should reflect top-level this property assignment", function () {
+    const globals = getGlobalsForCode(`
+this.foo = 10;
+`);
+    assert.deepEqual(globals, [{ name: "foo", writable: true }]);
+  });
+
+  it("should reflect this property assignment inside block", function () {
+    const globals = getGlobalsForCode(`
+{
+  this.foo = 10;
+}
+`);
+    assert.deepEqual(globals, [{ name: "foo", writable: true }]);
+  });
+
+  it("should ignore this property assignment inside function declaration", function () {
+    const globals = getGlobalsForCode(`
+function f() {
+  this.foo = 10;
+}
+`);
+    assert.deepEqual(globals, [{ name: "f", writable: true }]);
+  });
+
+  it("should ignore this property assignment inside function expression", function () {
+    const globals = getGlobalsForCode(`
+(function f() {
+  this.foo = 10;
+});
+`);
+    assert.deepEqual(globals, []);
+  });
+
+  it("should ignore this property assignment inside method", function () {
+    const globals = getGlobalsForCode(`
+({
+  method() {
+    this.foo = 10;
+  }
+});
+`);
+    assert.deepEqual(globals, []);
+  });
+
+  it("should ignore this property assignment inside accessor", function () {
+    const globals = getGlobalsForCode(`
+({
+  get x() {
+    this.foo = 10;
+  },
+  set x(v) {
+    this.bar = 10;
+  }
+});
+`);
+    assert.deepEqual(globals, []);
+  });
+
+  it("should reflect this property assignment inside arrow function", function () {
+    const globals = getGlobalsForCode(`
+() => {
+  this.foo = 10;
+};
+`);
+    assert.deepEqual(globals, [{ name: "foo", writable: true }]);
+  });
+
+  it("should ignore this property assignment inside arrow function inside function expression", function () {
+    const globals = getGlobalsForCode(`
+(function f() {
+  () => {
+    this.foo = 10;
+  };
+});
+`);
+    assert.deepEqual(globals, []);
+  });
+
+  it("should ignore this property assignment inside class static", function () {
+    const globals = getGlobalsForCode(`
+class A {
+  static {
+    this.foo = 10;
+    (() => {
+      this.bar = 10;
+    })();
+  }
+}
+`);
+    assert.deepEqual(globals, [{ name: "A", writable: true }]);
+  });
+
+  it("should ignore this property assignment inside class property", function () {
+    const globals = getGlobalsForCode(`
+class A {
+  a = this.foo = 10;
+  b = (() => {
+    this.bar = 10;
+  })();
+}
+`);
+    assert.deepEqual(globals, [{ name: "A", writable: true }]);
+  });
+
+  it("should ignore this property assignment inside class static property", function () {
+    const globals = getGlobalsForCode(`
+class A {
+  static a = this.foo = 10;
+  static b = (() => {
+    this.bar = 10;
+  })();
+}
+`);
+    assert.deepEqual(globals, [{ name: "A", writable: true }]);
+  });
+
+  it("should ignore this property assignment inside class private property", function () {
+    const globals = getGlobalsForCode(`
+class A {
+  #a = this.foo = 10;
+  #b = (() => {
+    this.bar = 10;
+  })();
+}
+`);
+    assert.deepEqual(globals, [{ name: "A", writable: true }]);
+  });
+
+  it("should ignore this property assignment inside class static private property", function () {
+    const globals = getGlobalsForCode(`
+class A {
+  static #a = this.foo = 10;
+  static #b = (() => {
+    this.bar = 10;
+  })();
+}
+`);
+    assert.deepEqual(globals, [{ name: "A", writable: true }]);
+  });
+
+  it("should reflect lazy getters", function () {
+    const globals = getGlobalsForCode(`
+ChromeUtils.defineESModuleGetters(this, {
+  A: "B",
+});
+`);
+    assert.deepEqual(globals, [{ name: "A", writable: true, explicit: true }]);
+  });
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/lazy-getter-object-name.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/lazy-getter-object-name.js
new file mode 100644
index 0000000000..33a2a6c130
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/lazy-getter-object-name.js
@@ -0,0 +1,51 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/lazy-getter-object-name");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code) {
+  return {
+    code,
+    errors: [{ messageId: "mustUseLazy", type: "CallExpression" }],
+  };
+}
+
+ruleTester.run("lazy-getter-object-name", rule, {
+  valid: [
+    `
+    ChromeUtils.defineESModuleGetters(lazy, {
+      AppConstants: "resource://gre/modules/AppConstants.sys.mjs",
+    });
+`,
+  ],
+  invalid: [
+    invalidCode(`
+    ChromeUtils.defineESModuleGetters(obj, {
+      AppConstants: "resource://gre/modules/AppConstants.sys.mjs",
+    });
+`),
+    invalidCode(`
+    ChromeUtils.defineESModuleGetters(this, {
+      AppConstants: "resource://gre/modules/AppConstants.sys.mjs",
+    });
+`),
+    invalidCode(`
+    ChromeUtils.defineESModuleGetters(window, {
+      AppConstants: "resource://gre/modules/AppConstants.sys.mjs",
+    });
+`),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/mark-exported-symbols-as-used.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/mark-exported-symbols-as-used.js
new file mode 100644
index 0000000000..e738825fab
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/mark-exported-symbols-as-used.js
@@ -0,0 +1,45 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/mark-exported-symbols-as-used");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, type, messageId) {
+  return { code, errors: [{ messageId, type }] };
+}
+
+ruleTester.run("mark-exported-symbols-as-used", rule, {
+  valid: [
+    "var EXPORTED_SYMBOLS = ['foo'];",
+    "this.EXPORTED_SYMBOLS = ['foo'];",
+  ],
+  invalid: [
+    invalidCode(
+      "let EXPORTED_SYMBOLS = ['foo'];",
+      "VariableDeclaration",
+      "useLetForExported"
+    ),
+    invalidCode(
+      "var EXPORTED_SYMBOLS = 'foo';",
+      "VariableDeclaration",
+      "nonArrayAssignedToImported"
+    ),
+    invalidCode(
+      "this.EXPORTED_SYMBOLS = 'foo';",
+      "AssignmentExpression",
+      "nonArrayAssignedToImported"
+    ),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/no-addtask-setup.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-addtask-setup.js
new file mode 100644
index 0000000000..cd036d7d91
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-addtask-setup.js
@@ -0,0 +1,69 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/no-addtask-setup");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function callError() {
+  return [{ messageId: "useAddSetup", type: "CallExpression" }];
+}
+
+ruleTester.run("no-addtask-setup", rule, {
+  valid: [
+    "add_task(function() {});",
+    "add_task(function () {});",
+    "add_task(function foo() {});",
+    "add_task(async function() {});",
+    "add_task(async function () {});",
+    "add_task(async function foo() {});",
+    "something(function setup() {});",
+    "something(async function setup() {});",
+    "add_task(setup);",
+    "add_task(setup => {});",
+    "add_task(async setup => {});",
+  ],
+  invalid: [
+    {
+      code: "add_task(function setup() {});",
+      output: "add_setup(function() {});",
+      errors: callError(),
+    },
+    {
+      code: "add_task(function setup () {});",
+      output: "add_setup(function () {});",
+      errors: callError(),
+    },
+    {
+      code: "add_task(async function setup() {});",
+      output: "add_setup(async function() {});",
+      errors: callError(),
+    },
+    {
+      code: "add_task(async function setup () {});",
+      output: "add_setup(async function () {});",
+      errors: callError(),
+    },
+    {
+      code: "add_task(async function setUp() {});",
+      output: "add_setup(async function() {});",
+      errors: callError(),
+    },
+    {
+      code: "add_task(async function init() {});",
+      output: "add_setup(async function() {});",
+      errors: callError(),
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/no-arbitrary-setTimeout.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-arbitrary-setTimeout.js
new file mode 100644
index 0000000000..ea194af6e3
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-arbitrary-setTimeout.js
@@ -0,0 +1,39 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/no-arbitrary-setTimeout");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function wrapCode(code, filename = "xpcshell/test_foo.js") {
+  return { code, filename };
+}
+
+function invalidCode(code) {
+  let obj = wrapCode(code);
+  obj.errors = [{ messageId: "listenForEvents", type: "CallExpression" }];
+  return obj;
+}
+
+ruleTester.run("no-arbitrary-setTimeout", rule, {
+  valid: [
+    wrapCode("setTimeout(function() {}, 0);"),
+    wrapCode("setTimeout(function() {});"),
+    wrapCode("setTimeout(function() {}, 10);", "test_foo.js"),
+  ],
+  invalid: [
+    invalidCode("setTimeout(function() {}, 10);"),
+    invalidCode("setTimeout(function() {}, timeout);"),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/no-compare-against-boolean-literals.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-compare-against-boolean-literals.js
new file mode 100644
index 0000000000..983ff0583e
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-compare-against-boolean-literals.js
@@ -0,0 +1,59 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/no-compare-against-boolean-literals");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function callError() {
+  return [{ messageId: "noCompareBoolean", type: "BinaryExpression" }];
+}
+
+ruleTester.run("no-compare-against-boolean-literals", rule, {
+  valid: [`if (!foo) {}`, `if (!!foo) {}`],
+  invalid: [
+    {
+      code: `if (foo == true) {}`,
+      errors: callError(),
+    },
+    {
+      code: `if (foo != true) {}`,
+      errors: callError(),
+    },
+    {
+      code: `if (foo == false) {}`,
+      errors: callError(),
+    },
+    {
+      code: `if (foo != false) {}`,
+      errors: callError(),
+    },
+    {
+      code: `if (true == foo) {}`,
+      errors: callError(),
+    },
+    {
+      code: `if (true != foo) {}`,
+      errors: callError(),
+    },
+    {
+      code: `if (false == foo) {}`,
+      errors: callError(),
+    },
+    {
+      code: `if (false != foo) {}`,
+      errors: callError(),
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/no-cu-reportError.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-cu-reportError.js
new file mode 100644
index 0000000000..6650c8bf4e
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-cu-reportError.js
@@ -0,0 +1,100 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/no-cu-reportError");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function callError() {
+  return [{ messageId: "useConsoleError", type: "CallExpression" }];
+}
+
+ruleTester.run("no-cu-reportError", rule, {
+  valid: [
+    "console.error('foo')",
+    "Cu.cloneInto({}, {})",
+    "foo().catch(console.error)",
+    // TODO: Bug 1802347 - this should be treated as an error as well.
+    "Cu.reportError('foo', stack)",
+  ],
+  invalid: [
+    {
+      code: "Cu.reportError('foo')",
+      output: "console.error('foo')",
+      errors: callError(),
+    },
+    {
+      code: "Cu.reportError(bar)",
+      output: "console.error(bar)",
+      errors: callError(),
+    },
+    {
+      code: "Cu.reportError(bar.stack)",
+      output: "console.error(bar.stack)",
+      errors: callError(),
+    },
+    {
+      code: "foo().catch(Cu.reportError)",
+      output: "foo().catch(console.error)",
+      errors: callError(),
+    },
+    {
+      code: "foo().then(bar, Cu.reportError)",
+      output: "foo().then(bar, console.error)",
+      errors: callError(),
+    },
+    // When referencing identifiers/members, try to reference them rather
+    // than stringifying:
+    {
+      code: "Cu.reportError('foo' + e)",
+      output: "console.error('foo', e)",
+      errors: callError(),
+    },
+    {
+      code: "Cu.reportError('foo' + msg.data)",
+      output: "console.error('foo', msg.data)",
+      errors: callError(),
+    },
+    // Don't touch existing concatenation of literals (usually done for
+    // wrapping reasons)
+    {
+      code: "Cu.reportError('foo' + 'bar' + 'baz')",
+      output: "console.error('foo' + 'bar' + 'baz')",
+      errors: callError(),
+    },
+    // Ensure things work when nested:
+    {
+      code: "Cu.reportError('foo' + e + 'baz')",
+      output: "console.error('foo', e, 'baz')",
+      errors: callError(),
+    },
+    // Ensure things work when nested in different places:
+    {
+      code: "Cu.reportError('foo' + e + 'quux' + 'baz')",
+      output: "console.error('foo', e, 'quux' + 'baz')",
+      errors: callError(),
+    },
+    {
+      code: "Cu.reportError('foo' + 'quux' + e + 'baz')",
+      output: "console.error('foo' + 'quux', e, 'baz')",
+      errors: callError(),
+    },
+    // Ensure things work with parens changing order of operations:
+    {
+      code: "Cu.reportError('foo' + 'quux' + (e + 'baz'))",
+      output: "console.error('foo' + 'quux' + (e + 'baz'))",
+      errors: callError(),
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/no-define-cc-etc.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-define-cc-etc.js
new file mode 100644
index 0000000000..ed71f6087e
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-define-cc-etc.js
@@ -0,0 +1,63 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/no-define-cc-etc");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, varNames) {
+  if (!Array.isArray(varNames)) {
+    varNames = [varNames];
+  }
+  return {
+    code,
+    errors: varNames.map(name => {
+      return {
+        messageId: "noSeparateDefinition",
+        data: { name },
+        type: "VariableDeclarator",
+      };
+    }),
+  };
+}
+
+ruleTester.run("no-define-cc-etc", rule, {
+  valid: [
+    "var Cm = Components.manager;",
+    "const CC = Components.Constructor;",
+    "var {Constructor: CC, manager: Cm} = Components;",
+    "const {Constructor: CC, manager: Cm} = Components;",
+    "foo.Cc.test();",
+    "const {bar, ...foo} = obj;",
+  ],
+  invalid: [
+    invalidCode("var Cc;", "Cc"),
+    invalidCode("let Cc;", "Cc"),
+    invalidCode("let Ci;", "Ci"),
+    invalidCode("let Cr;", "Cr"),
+    invalidCode("let Cu;", "Cu"),
+    invalidCode("var Cc = Components.classes;", "Cc"),
+    invalidCode("const {classes: Cc} = Components;", "Cc"),
+    invalidCode("let {classes: Cc, manager: Cm} = Components", "Cc"),
+    invalidCode("const Cu = Components.utils;", "Cu"),
+    invalidCode("var Ci = Components.interfaces, Cc = Components.classes;", [
+      "Ci",
+      "Cc",
+    ]),
+    invalidCode("var {'interfaces': Ci, 'classes': Cc} = Components;", [
+      "Ci",
+      "Cc",
+    ]),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/no-redeclare-with-import-autofix.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-redeclare-with-import-autofix.js
new file mode 100644
index 0000000000..36842000d5
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-redeclare-with-import-autofix.js
@@ -0,0 +1,77 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/no-redeclare-with-import-autofix");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, output, messageId, options = []) {
+  let rv = {
+    code,
+    errors: [{ messageId }],
+    options,
+  };
+  if (output) {
+    rv.output = output;
+  }
+  return rv;
+}
+
+ruleTester.run("no-redeclare-with-import-autofix", rule, {
+  valid: [
+    'const foo = "whatever";',
+    'let foo = "whatever";',
+    'const {foo} = {foo: "whatever"};',
+    'const {foo} = ChromeUtils.import("foo.jsm")',
+    'let {foo} = ChromeUtils.import("foo.jsm")',
+    'const {foo} = ChromeUtils.importESModule("foo.sys.mjs")',
+    'let {foo} = ChromeUtils.importESModule("foo.sys.mjs")',
+  ],
+  invalid: [
+    invalidCode(
+      `var {foo} = ChromeUtils.importESModule("foo.sys.mjs");
+var {foo} = ChromeUtils.importESModule("foo.sys.mjs");`,
+      'var {foo} = ChromeUtils.importESModule("foo.sys.mjs");\n',
+      "duplicateImport"
+    ),
+    invalidCode(
+      `var {foo} = ChromeUtils.import("foo.jsm");
+var {foo} = ChromeUtils.import("foo.jsm");`,
+      'var {foo} = ChromeUtils.import("foo.jsm");\n',
+      "duplicateImport"
+    ),
+
+    invalidCode(
+      `var {foo} = ChromeUtils.import("foo.jsm");
+var {foo, bar} = ChromeUtils.import("foo.jsm");`,
+      `var {foo} = ChromeUtils.import("foo.jsm");
+var { bar} = ChromeUtils.import("foo.jsm");`,
+      "duplicateImport"
+    ),
+
+    invalidCode(
+      `var {foo} = ChromeUtils.import("foo.jsm");
+var {bar, foo} = ChromeUtils.import("foo.jsm");`,
+      `var {foo} = ChromeUtils.import("foo.jsm");
+var {bar} = ChromeUtils.import("foo.jsm");`,
+      "duplicateImport"
+    ),
+
+    invalidCode(`var foo = 5; var foo = 10;`, "", "redeclared", [
+      {
+        errorForNonImports: true,
+      },
+    ]),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/no-throw-cr-literal.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-throw-cr-literal.js
new file mode 100644
index 0000000000..aecc5cd971
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-throw-cr-literal.js
@@ -0,0 +1,62 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/no-throw-cr-literal");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, output, messageId) {
+  return {
+    code,
+    output,
+    errors: [{ messageId, type: "ThrowStatement" }],
+  };
+}
+
+ruleTester.run("no-throw-cr-literal", rule, {
+  valid: [
+    'throw Components.Exception("", Cr.NS_ERROR_NOT_IMPLEMENTED);',
+    'throw Components.Exception("", Components.results.NS_ERROR_UNEXPECTED);',
+    'function t() { throw Components.Exception("", Cr.NS_ERROR_NO_CONTENT); }',
+    // We don't handle combined values, regular no-throw-literal catches them
+    'throw Components.results.NS_ERROR_UNEXPECTED + "whoops";',
+  ],
+  invalid: [
+    invalidCode(
+      "throw Cr.NS_ERROR_NO_INTERFACE;",
+      'throw Components.Exception("", Cr.NS_ERROR_NO_INTERFACE);',
+      "bareCR"
+    ),
+    invalidCode(
+      "throw Components.results.NS_ERROR_ABORT;",
+      'throw Components.Exception("", Components.results.NS_ERROR_ABORT);',
+      "bareComponentsResults"
+    ),
+    invalidCode(
+      "function t() { throw Cr.NS_ERROR_NULL_POINTER; }",
+      'function t() { throw Components.Exception("", Cr.NS_ERROR_NULL_POINTER); }',
+      "bareCR"
+    ),
+    invalidCode(
+      "throw new Error(Cr.NS_ERROR_ABORT);",
+      'throw Components.Exception("", Cr.NS_ERROR_ABORT);',
+      "newErrorCR"
+    ),
+    invalidCode(
+      "throw new Error(Components.results.NS_ERROR_ABORT);",
+      'throw Components.Exception("", Components.results.NS_ERROR_ABORT);',
+      "newErrorComponentsResults"
+    ),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/no-useless-parameters.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-useless-parameters.js
new file mode 100644
index 0000000000..28d4d0d151
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-useless-parameters.js
@@ -0,0 +1,175 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/no-useless-parameters");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function callError(messageId, data = {}) {
+  return [{ messageId, data, type: "CallExpression" }];
+}
+
+ruleTester.run("no-useless-parameters", rule, {
+  valid: [
+    "Services.prefs.clearUserPref('browser.search.custom');",
+    "Services.removeObserver('notification name', {});",
+    "Services.io.newURI('http://example.com');",
+    "Services.io.newURI('http://example.com', 'utf8');",
+    "elt.addEventListener('click', handler);",
+    "elt.addEventListener('click', handler, true);",
+    "elt.addEventListener('click', handler, {once: true});",
+    "elt.removeEventListener('click', handler);",
+    "elt.removeEventListener('click', handler, true);",
+    "Services.obs.addObserver(this, 'topic', true);",
+    "Services.obs.addObserver(this, 'topic');",
+    "Services.prefs.addObserver('branch', this, true);",
+    "Services.prefs.addObserver('branch', this);",
+    "array.appendElement(elt);",
+    "Services.obs.notifyObservers(obj, 'topic', 'data');",
+    "Services.obs.notifyObservers(obj, 'topic');",
+    "window.getComputedStyle(elt);",
+    "window.getComputedStyle(elt, ':before');",
+  ],
+  invalid: [
+    {
+      code: "Services.prefs.clearUserPref('browser.search.custom', false);",
+      output: "Services.prefs.clearUserPref('browser.search.custom');",
+      errors: callError("onlyTakes", {
+        fnName: "clearUserPref",
+        params: "1 parameter",
+      }),
+    },
+    {
+      code: "Services.prefs.clearUserPref('browser.search.custom',\n   false);",
+      output: "Services.prefs.clearUserPref('browser.search.custom');",
+      errors: callError("onlyTakes", {
+        fnName: "clearUserPref",
+        params: "1 parameter",
+      }),
+    },
+    {
+      code: "Services.removeObserver('notification name', {}, false);",
+      output: "Services.removeObserver('notification name', {});",
+      errors: callError("onlyTakes", {
+        fnName: "removeObserver",
+        params: "2 parameters",
+      }),
+    },
+    {
+      code: "Services.removeObserver('notification name', {}, true);",
+      output: "Services.removeObserver('notification name', {});",
+      errors: callError("onlyTakes", {
+        fnName: "removeObserver",
+        params: "2 parameters",
+      }),
+    },
+    {
+      code: "Services.io.newURI('http://example.com', null, null);",
+      output: "Services.io.newURI('http://example.com');",
+      errors: callError("newURIParams"),
+    },
+    {
+      code: "Services.io.newURI('http://example.com', 'utf8', null);",
+      output: "Services.io.newURI('http://example.com', 'utf8');",
+      errors: callError("newURIParams"),
+    },
+    {
+      code: "Services.io.newURI('http://example.com', null);",
+      output: "Services.io.newURI('http://example.com');",
+      errors: callError("newURIParams"),
+    },
+    {
+      code: "Services.io.newURI('http://example.com', '', '');",
+      output: "Services.io.newURI('http://example.com');",
+      errors: callError("newURIParams"),
+    },
+    {
+      code: "Services.io.newURI('http://example.com', '');",
+      output: "Services.io.newURI('http://example.com');",
+      errors: callError("newURIParams"),
+    },
+    {
+      code: "elt.addEventListener('click', handler, false);",
+      output: "elt.addEventListener('click', handler);",
+      errors: callError("obmittedWhenFalse", {
+        fnName: "addEventListener",
+        index: "third",
+      }),
+    },
+    {
+      code: "elt.removeEventListener('click', handler, false);",
+      output: "elt.removeEventListener('click', handler);",
+      errors: callError("obmittedWhenFalse", {
+        fnName: "removeEventListener",
+        index: "third",
+      }),
+    },
+    {
+      code: "Services.obs.addObserver(this, 'topic', false);",
+      output: "Services.obs.addObserver(this, 'topic');",
+      errors: callError("obmittedWhenFalse", {
+        fnName: "addObserver",
+        index: "third",
+      }),
+    },
+    {
+      code: "Services.prefs.addObserver('branch', this, false);",
+      output: "Services.prefs.addObserver('branch', this);",
+      errors: callError("obmittedWhenFalse", {
+        fnName: "addObserver",
+        index: "third",
+      }),
+    },
+    {
+      code: "array.appendElement(elt, false);",
+      output: "array.appendElement(elt);",
+      errors: callError("obmittedWhenFalse", {
+        fnName: "appendElement",
+        index: "second",
+      }),
+    },
+    {
+      code: "Services.obs.notifyObservers(obj, 'topic', null);",
+      output: "Services.obs.notifyObservers(obj, 'topic');",
+      errors: callError("obmittedWhenFalse", {
+        fnName: "notifyObservers",
+        index: "third",
+      }),
+    },
+    {
+      code: "Services.obs.notifyObservers(obj, 'topic', '');",
+      output: "Services.obs.notifyObservers(obj, 'topic');",
+      errors: callError("obmittedWhenFalse", {
+        fnName: "notifyObservers",
+        index: "third",
+      }),
+    },
+    {
+      code: "window.getComputedStyle(elt, null);",
+      output: "window.getComputedStyle(elt);",
+      errors: callError("obmittedWhenFalse", {
+        fnName: "getComputedStyle",
+        index: "second",
+      }),
+    },
+    {
+      code: "window.getComputedStyle(elt, '');",
+      output: "window.getComputedStyle(elt);",
+      errors: callError("obmittedWhenFalse", {
+        fnName: "getComputedStyle",
+        index: "second",
+      }),
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/no-useless-removeEventListener.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-useless-removeEventListener.js
new file mode 100644
index 0000000000..f5fc60158d
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-useless-removeEventListener.js
@@ -0,0 +1,96 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/no-useless-removeEventListener");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code) {
+  return { code, errors: [{ messageId: "useOnce", type: "CallExpression" }] };
+}
+
+ruleTester.run("no-useless-removeEventListener", rule, {
+  valid: [
+    // Listeners that aren't a function are always valid.
+    "elt.addEventListener('click', handler);",
+    "elt.addEventListener('click', handler, true);",
+    "elt.addEventListener('click', handler, {once: true});",
+
+    // Should not fail on empty functions.
+    "elt.addEventListener('click', function() {});",
+
+    // Should not reject when removing a listener for another event.
+    "elt.addEventListener('click', function listener() {" +
+      "  elt.removeEventListener('keypress', listener);" +
+      "});",
+
+    // Should not reject when there's another instruction before
+    // removeEventListener.
+    "elt.addEventListener('click', function listener() {" +
+      "  elt.focus();" +
+      "  elt.removeEventListener('click', listener);" +
+      "});",
+
+    // Should not reject when wantsUntrusted is true.
+    "elt.addEventListener('click', function listener() {" +
+      "  elt.removeEventListener('click', listener);" +
+      "}, false, true);",
+
+    // Should not reject when there's a literal and a variable
+    "elt.addEventListener('click', function listener() {" +
+      "  elt.removeEventListener(eventName, listener);" +
+      "});",
+
+    // Should not reject when there's 2 different variables
+    "elt.addEventListener(event1, function listener() {" +
+      "  elt.removeEventListener(event2, listener);" +
+      "});",
+
+    // Should not fail if this is a different type of event listener function.
+    "myfunc.addEventListener(listener);",
+  ],
+  invalid: [
+    invalidCode(
+      "elt.addEventListener('click', function listener() {" +
+        "  elt.removeEventListener('click', listener);" +
+        "});"
+    ),
+    invalidCode(
+      "elt.addEventListener('click', function listener() {" +
+        "  elt.removeEventListener('click', listener, true);" +
+        "}, true);"
+    ),
+    invalidCode(
+      "elt.addEventListener('click', function listener() {" +
+        "  elt.removeEventListener('click', listener);" +
+        "}, {once: true});"
+    ),
+    invalidCode(
+      "elt.addEventListener('click', function listener() {" +
+        "  /* Comment */" +
+        "  elt.removeEventListener('click', listener);" +
+        "});"
+    ),
+    invalidCode(
+      "elt.addEventListener('click', function() {" +
+        "  elt.removeEventListener('click', arguments.callee);" +
+        "});"
+    ),
+    invalidCode(
+      "elt.addEventListener(eventName, function listener() {" +
+        "  elt.removeEventListener(eventName, listener);" +
+        "});"
+    ),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/no-useless-run-test.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-useless-run-test.js
new file mode 100644
index 0000000000..5ee6e0e575
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-useless-run-test.js
@@ -0,0 +1,126 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/no-useless-run-test");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, output) {
+  return {
+    code,
+    output,
+    errors: [{ messageId: "noUselessRunTest", type: "FunctionDeclaration" }],
+  };
+}
+
+ruleTester.run("no-useless-run-test", rule, {
+  valid: [
+    "function run_test() {}",
+    "function run_test() {let args = 1; run_next_test();}",
+    "function run_test() {fakeCall(); run_next_test();}",
+  ],
+  invalid: [
+    // Single-line case.
+    invalidCode("function run_test() { run_next_test(); }", ""),
+    // Multiple-line cases
+    invalidCode(
+      `
+function run_test() {
+  run_next_test();
+}`,
+      ``
+    ),
+    invalidCode(
+      `
+foo();
+function run_test() {
+ run_next_test();
+}
+`,
+      `
+foo();
+`
+    ),
+    invalidCode(
+      `
+foo();
+function run_test() {
+  run_next_test();
+}
+bar();
+`,
+      `
+foo();
+bar();
+`
+    ),
+    invalidCode(
+      `
+foo();
+
+function run_test() {
+  run_next_test();
+}
+
+bar();`,
+      `
+foo();
+
+bar();`
+    ),
+    invalidCode(
+      `
+foo();
+
+function run_test() {
+  run_next_test();
+}
+
+// A comment
+bar();
+`,
+      `
+foo();
+
+// A comment
+bar();
+`
+    ),
+    invalidCode(
+      `
+foo();
+
+/**
+ * A useful comment.
+ */
+function run_test() {
+  run_next_test();
+}
+
+// A comment
+bar();
+`,
+      `
+foo();
+
+/**
+ * A useful comment.
+ */
+
+// A comment
+bar();
+`
+    ),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/prefer-boolean-length-check.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/prefer-boolean-length-check.js
new file mode 100644
index 0000000000..102112a3f5
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/prefer-boolean-length-check.js
@@ -0,0 +1,96 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/prefer-boolean-length-check");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidError() {
+  return [{ messageId: "preferBooleanCheck", type: "BinaryExpression" }];
+}
+
+ruleTester.run("check-length", rule, {
+  valid: [
+    "if (foo.length && foo.length) {}",
+    "if (!foo.length) {}",
+    "if (foo.value == 0) {}",
+    "if (foo.value > 0) {}",
+    "if (0 == foo.value) {}",
+    "if (0 < foo.value) {}",
+    "var a = !!foo.length",
+    "function bar() { return !!foo.length }",
+  ],
+  invalid: [
+    {
+      code: "if (foo.length == 0) {}",
+      output: "if (!foo.length) {}",
+      errors: invalidError(),
+    },
+    {
+      code: "if (foo.length > 0) {}",
+      output: "if (foo.length) {}",
+      errors: invalidError(),
+    },
+    {
+      code: "if (0 < foo.length) {}",
+      output: "if (foo.length) {}",
+      errors: invalidError(),
+    },
+    {
+      code: "if (0 == foo.length) {}",
+      output: "if (!foo.length) {}",
+      errors: invalidError(),
+    },
+    {
+      code: "if (foo && foo.length == 0) {}",
+      output: "if (foo && !foo.length) {}",
+      errors: invalidError(),
+    },
+    {
+      code: "if (foo.bar.length == 0) {}",
+      output: "if (!foo.bar.length) {}",
+      errors: invalidError(),
+    },
+    {
+      code: "var a = foo.length>0",
+      output: "var a = !!foo.length",
+      errors: invalidError(),
+    },
+    {
+      code: "function bar() { return foo.length>0 }",
+      output: "function bar() { return !!foo.length }",
+      errors: invalidError(),
+    },
+    {
+      code: "if (foo && bar.length>0) {}",
+      output: "if (foo && bar.length) {}",
+      errors: invalidError(),
+    },
+    {
+      code: "while (foo && bar.length>0) {}",
+      output: "while (foo && bar.length) {}",
+      errors: invalidError(),
+    },
+    {
+      code: "x = y && bar.length > 0",
+      output: "x = y && !!bar.length",
+      errors: invalidError(),
+    },
+    {
+      code: "function bar() { return x && foo.length > 0}",
+      output: "function bar() { return x && !!foo.length}",
+      errors: invalidError(),
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/prefer-formatValues.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/prefer-formatValues.js
new file mode 100644
index 0000000000..4aa5cd1d3c
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/prefer-formatValues.js
@@ -0,0 +1,70 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/prefer-formatValues");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function error(line, column = undefined) {
+  return {
+    messageId: "useSingleCall",
+    type: "CallExpression",
+    line,
+    column,
+  };
+}
+
+ruleTester.run("check-length", rule, {
+  valid: [
+    "document.l10n.formatValue('foobar');",
+    "document.l10n.formatValues(['foobar', 'foobaz']);",
+    `if (foo) {
+       document.l10n.formatValue('foobar');
+     } else {
+       document.l10n.formatValue('foobaz');
+     }`,
+    `document.l10n.formatValue('foobaz');
+     if (foo) {
+       document.l10n.formatValue('foobar');
+     }`,
+    `if (foo) {
+       document.l10n.formatValue('foobar');
+     }
+     document.l10n.formatValue('foobaz');`,
+    `if (foo) {
+       document.l10n.formatValue('foobar');
+     }
+     document.l10n.formatValues(['foobaz']);`,
+  ],
+  invalid: [
+    {
+      code: `document.l10n.formatValue('foobar');
+             document.l10n.formatValue('foobaz');`,
+      errors: [error(1, 1), error(2, 14)],
+    },
+    {
+      code: `document.l10n.formatValue('foobar');
+             if (foo) {
+               document.l10n.formatValue('foobiz');
+             }
+             document.l10n.formatValue('foobaz');`,
+      errors: [error(1, 1), error(5, 14)],
+    },
+    {
+      code: `document.l10n.formatValues('foobar');
+             document.l10n.formatValue('foobaz');`,
+      errors: [error(1, 1), error(2, 14)],
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-addtask-only.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-addtask-only.js
new file mode 100644
index 0000000000..30d274fbfa
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-addtask-only.js
@@ -0,0 +1,56 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-addtask-only");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidError(output) {
+  let message =
+    "add_task(...).only() not allowed - add an exception if this is intentional";
+  return [
+    {
+      message,
+      type: "CallExpression",
+      suggestions: [{ desc: "Remove only() call from task", output }],
+    },
+  ];
+}
+
+ruleTester.run("reject-addtask-only", rule, {
+  valid: [
+    "add_task(foo())",
+    "add_task(foo()).skip()",
+    "add_task(function() {})",
+    "add_task(function() {}).skip()",
+  ],
+  invalid: [
+    {
+      code: "add_task(foo()).only()",
+      errors: invalidError("add_task(foo())"),
+    },
+    {
+      code: "add_task(foo()).only(bar())",
+      errors: invalidError("add_task(foo())"),
+    },
+    {
+      code: "add_task(function() {}).only()",
+      errors: invalidError("add_task(function() {})"),
+    },
+    {
+      code: "add_task(function() {}).only(bar())",
+      errors: invalidError("add_task(function() {})"),
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-chromeutils-import-params.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-chromeutils-import-params.js
new file mode 100644
index 0000000000..17f25cdbc6
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-chromeutils-import-params.js
@@ -0,0 +1,67 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-chromeutils-import-params");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidError(suggested) {
+  return [
+    {
+      message: "ChromeUtils.import only takes one argument.",
+      type: "CallExpression",
+      suggestions: [
+        {
+          desc: "Remove the unnecessary parameters.",
+          output: suggested,
+        },
+      ],
+    },
+  ];
+}
+
+ruleTester.run("reject-chromeutils-import-params", rule, {
+  valid: ['ChromeUtils.import("resource://some/path/to/My.jsm")'],
+  invalid: [
+    {
+      code: 'ChromeUtils.import("resource://some/path/to/My.jsm", null)',
+      errors: invalidError(
+        `ChromeUtils.import("resource://some/path/to/My.jsm")`
+      ),
+    },
+    {
+      code: `
+ChromeUtils.import(
+  "resource://some/path/to/My.jsm",
+  null
+);`,
+      errors: invalidError(`
+ChromeUtils.import(
+  "resource://some/path/to/My.jsm"
+);`),
+    },
+    {
+      code: 'ChromeUtils.import("resource://some/path/to/My.jsm", this)',
+      errors: invalidError(
+        `ChromeUtils.import("resource://some/path/to/My.jsm")`
+      ),
+    },
+    {
+      code: 'ChromeUtils.import("resource://some/path/to/My.jsm", foo, bar)',
+      errors: invalidError(
+        `ChromeUtils.import("resource://some/path/to/My.jsm")`
+      ),
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-eager-module-in-lazy-getter.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-eager-module-in-lazy-getter.js
new file mode 100644
index 0000000000..9b6f2d6ecc
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-eager-module-in-lazy-getter.js
@@ -0,0 +1,80 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-eager-module-in-lazy-getter");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, uri) {
+  return { code, errors: [{ messageId: "eagerModule", data: { uri } }] };
+}
+
+ruleTester.run("reject-eager-module-in-lazy-getter", rule, {
+  valid: [
+    `
+    XPCOMUtils.defineLazyModuleGetter(
+      lazy, "Integration", "resource://gre/modules/Integration.jsm"
+    );
+`,
+    `
+    ChromeUtils.defineModuleGetter(
+      lazy, "Integration", "resource://gre/modules/Integration.jsm"
+    );
+`,
+    `
+    XPCOMUtils.defineLazyModuleGetters(lazy, {
+      Integration: "resource://gre/modules/Integration.jsm",
+    });
+`,
+    `
+    ChromeUtils.defineESModuleGetters(lazy, {
+      Integration: "resource://gre/modules/Integration.sys.mjs",
+    });
+`,
+  ],
+  invalid: [
+    invalidCode(
+      `
+    XPCOMUtils.defineLazyModuleGetter(
+      lazy, "AppConstants", "resource://gre/modules/AppConstants.jsm"
+    );
+`,
+      "resource://gre/modules/AppConstants.jsm"
+    ),
+    invalidCode(
+      `
+    ChromeUtils.defineModuleGetter(
+      lazy, "XPCOMUtils", "resource://gre/modules/XPCOMUtils.jsm"
+    );
+`,
+      "resource://gre/modules/XPCOMUtils.jsm"
+    ),
+    invalidCode(
+      `
+    XPCOMUtils.defineLazyModuleGetters(lazy, {
+      AppConstants: "resource://gre/modules/AppConstants.jsm",
+    });
+`,
+      "resource://gre/modules/AppConstants.jsm"
+    ),
+    invalidCode(
+      `
+    ChromeUtils.defineESModuleGetters(lazy, {
+      AppConstants: "resource://gre/modules/AppConstants.sys.mjs",
+    });
+`,
+      "resource://gre/modules/AppConstants.sys.mjs"
+    ),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-global-this.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-global-this.js
new file mode 100644
index 0000000000..3540846e83
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-global-this.js
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-global-this");
+var RuleTester = require("eslint").RuleTester;
+
+// class static block is available from ES2022 = 13.
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code) {
+  let message = "JSM should not use the global this";
+  return { code, errors: [{ message, type: "ThisExpression" }] };
+}
+
+ruleTester.run("reject-top-level-await", rule, {
+  valid: [
+    "function f() { this; }",
+    "(function f() { this; });",
+    "({ foo() { this; } });",
+    "({ get foo() { this; } })",
+    "({ set foo(x) { this; } })",
+    "class X { foo() { this; } }",
+    "class X { get foo() { this; } }",
+    "class X { set foo(x) { this; } }",
+    "class X { static foo() { this; } }",
+    "class X { static get foo() { this; } }",
+    "class X { static set foo(x) { this; } }",
+    "class X { P = this; }",
+    "class X { #P = this; }",
+    "class X { static { this; } }",
+  ],
+  invalid: [
+    invalidCode("this;"),
+    invalidCode("() => this;"),
+
+    invalidCode("this.foo = 10;"),
+    invalidCode("ChromeUtils.defineModuleGetter(this, {});"),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-globalThis-modification.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-globalThis-modification.js
new file mode 100644
index 0000000000..a69c677eb7
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-globalThis-modification.js
@@ -0,0 +1,90 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-globalThis-modification");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCall(code) {
+  return {
+    code,
+    errors: [
+      {
+        message:
+          "`globalThis` shouldn't be passed to function that can modify it. `globalThis` is the shared global inside the system module, and properties defined on it is visible from all modules.",
+        type: "CallExpression",
+      },
+    ],
+  };
+}
+
+function invalidAssignment(code) {
+  return {
+    code,
+    errors: [
+      {
+        message:
+          "`globalThis` shouldn't be modified. `globalThis` is the shared global inside the system module, and properties defined on it is visible from all modules.",
+        type: "AssignmentExpression",
+      },
+    ],
+  };
+}
+
+ruleTester.run("reject-globalThis-modification", rule, {
+  valid: [
+    `var x = globalThis.Array;`,
+    `Array in globalThis;`,
+    `result.deserialize(globalThis)`,
+  ],
+  invalid: [
+    invalidAssignment(`
+    globalThis.foo = 10;
+`),
+    invalidCall(`
+    Object.defineProperty(globalThis, "foo", { value: 10 });
+`),
+    invalidCall(`
+    Object.defineProperties(globalThis, {
+      foo: { value: 10 },
+    });
+`),
+    invalidCall(`
+    Object.assign(globalThis, { foo: 10 });
+`),
+    invalidCall(`
+    ChromeUtils.defineModuleGetter(
+      globalThis, "AppConstants", "resource://gre/modules/AppConstants.jsm"
+    );
+`),
+    invalidCall(`
+    ChromeUtils.defineESMGetters(globalThis, {
+      AppConstants: "resource://gre/modules/AppConstants.sys.mjs",
+    });
+`),
+    invalidCall(`
+    XPCOMUtils.defineLazyModuleGetter(
+      globalThis, "AppConstants", "resource://gre/modules/AppConstants.jsm"
+    );
+`),
+    invalidCall(`
+    XPCOMUtils.defineLazyModuleGetters(globalThis, {
+      AppConstants: "resource://gre/modules/AppConstants.jsm",
+    });
+`),
+    invalidCall(`
+    someFunction(1, globalThis);
+`),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-import-system-module-from-non-system.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-import-system-module-from-non-system.js
new file mode 100644
index 0000000000..5b09007626
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-import-system-module-from-non-system.js
@@ -0,0 +1,33 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-import-system-module-from-non-system");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({
+  parserOptions: { ecmaVersion: "latest", sourceType: "module" },
+});
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+ruleTester.run("reject-import-system-module-from-non-system", rule, {
+  valid: [
+    {
+      code: `const { AppConstants } = ChromeUtils.importESM("resource://gre/modules/AppConstants.sys.mjs");`,
+    },
+  ],
+  invalid: [
+    {
+      code: `import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs";`,
+      errors: [{ messageId: "rejectStaticImportSystemModuleFromNonSystem" }],
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-importGlobalProperties.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-importGlobalProperties.js
new file mode 100644
index 0000000000..cadce208b1
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-importGlobalProperties.js
@@ -0,0 +1,87 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-importGlobalProperties");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+ruleTester.run("reject-importGlobalProperties", rule, {
+  valid: [
+    {
+      code: "Cu.something();",
+    },
+    {
+      options: ["allownonwebidl"],
+      code: "Cu.importGlobalProperties(['fetch'])",
+    },
+    {
+      options: ["allownonwebidl"],
+      code: "XPCOMUtils.defineLazyGlobalGetters(this, ['fetch'])",
+    },
+    {
+      options: ["allownonwebidl"],
+      code: "Cu.importGlobalProperties(['TextEncoder'])",
+      filename: "foo.sjs",
+    },
+    {
+      options: ["allownonwebidl"],
+      code: "XPCOMUtils.defineLazyGlobalGetters(this, ['TextEncoder'])",
+      filename: "foo.sjs",
+    },
+  ],
+  invalid: [
+    {
+      code: "Cu.importGlobalProperties(['fetch'])",
+      options: ["everything"],
+      errors: [{ messageId: "unexpectedCall" }],
+    },
+    {
+      code: "XPCOMUtils.defineLazyGlobalGetters(this, ['fetch'])",
+      options: ["everything"],
+      errors: [{ messageId: "unexpectedCall" }],
+    },
+    {
+      code: "Cu.importGlobalProperties(['TextEncoder'])",
+      options: ["everything"],
+      errors: [{ messageId: "unexpectedCall" }],
+    },
+    {
+      code: "XPCOMUtils.defineLazyGlobalGetters(this, ['TextEncoder'])",
+      options: ["everything"],
+      errors: [{ messageId: "unexpectedCall" }],
+    },
+    {
+      code: "Cu.importGlobalProperties(['TextEncoder'])",
+      options: ["allownonwebidl"],
+      errors: [{ messageId: "unexpectedCallCuWebIdl" }],
+    },
+    {
+      code: "XPCOMUtils.defineLazyGlobalGetters(this, ['TextEncoder'])",
+      options: ["allownonwebidl"],
+      errors: [{ messageId: "unexpectedCallXPCOMWebIdl" }],
+    },
+    {
+      options: ["allownonwebidl"],
+      code: "Cu.importGlobalProperties(['TextEncoder'])",
+      errors: [{ messageId: "unexpectedCallCuWebIdl" }],
+      filename: "foo.js",
+    },
+    {
+      options: ["allownonwebidl"],
+      code: "XPCOMUtils.defineLazyGlobalGetters(this, ['TextEncoder'])",
+      errors: [{ messageId: "unexpectedCallXPCOMWebIdl" }],
+      filename: "foo.js",
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-lazy-imports-into-globals.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-lazy-imports-into-globals.js
new file mode 100644
index 0000000000..695816cc4b
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-lazy-imports-into-globals.js
@@ -0,0 +1,56 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-lazy-imports-into-globals");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({
+  parserOptions: { ecmaVersion: "latest", sourceType: "module" },
+});
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code) {
+  return { code, errors: [{ messageId: "rejectLazyImportsIntoGlobals" }] };
+}
+
+ruleTester.run("reject-lazy-imports-into-globals", rule, {
+  valid: [
+    `
+      const lazy = {};
+      XPCOMUtils.defineLazyGetter(lazy, "foo", () => {});
+    `,
+    `
+      const lazy = {};
+      ChromeUtils.defineLazyGetter(lazy, "foo", () => {});
+    `,
+  ],
+  invalid: [
+    invalidCode(`XPCOMUtils.defineLazyGetter(globalThis, "foo", () => {});`),
+    invalidCode(`XPCOMUtils.defineLazyGetter(window, "foo", () => {});`),
+    invalidCode(`ChromeUtils.defineLazyGetter(globalThis, "foo", () => {});`),
+    invalidCode(`ChromeUtils.defineLazyGetter(window, "foo", () => {});`),
+    invalidCode(
+      `XPCOMUtils.defineLazyModuleGetter(globalThis, "foo", "foo.jsm");`
+    ),
+    invalidCode(`XPCOMUtils.defineLazyModuleGetter(window, "foo", "foo.jsm");`),
+    invalidCode(
+      `XPCOMUtils.defineLazyPreferenceGetter(globalThis, "foo", "foo.bar");`
+    ),
+    invalidCode(
+      `XPCOMUtils.defineLazyServiceGetter(globalThis, "foo", "@foo", "nsIFoo");`
+    ),
+    invalidCode(`XPCOMUtils.defineLazyGlobalGetters(globalThis, {});`),
+    invalidCode(`XPCOMUtils.defineLazyGlobalGetters(window, {});`),
+    invalidCode(`XPCOMUtils.defineLazyModuleGetters(globalThis, {});`),
+    invalidCode(`ChromeUtils.defineESModuleGetters(window, {});`),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-mixing-eager-and-lazy.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-mixing-eager-and-lazy.js
new file mode 100644
index 0000000000..4392b96b7b
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-mixing-eager-and-lazy.js
@@ -0,0 +1,124 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-mixing-eager-and-lazy");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({
+  parserOptions: { ecmaVersion: "latest", sourceType: "module" },
+});
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, uri) {
+  return { code, errors: [{ messageId: "mixedEagerAndLazy", data: { uri } }] };
+}
+
+ruleTester.run("reject-mixing-eager-and-lazy", rule, {
+  valid: [
+    `
+    ChromeUtils.import("resource://gre/modules/AppConstants.jsm");
+`,
+    `
+    ChromeUtils.importESModule("resource://gre/modules/AppConstants.sys.mjs");
+`,
+    `
+    import{ AppConstants } from "resource://gre/modules/AppConstants.sys.mjs";
+`,
+    `
+    XPCOMUtils.defineLazyModuleGetter(
+      lazy, "AppConstants", "resource://gre/modules/AppConstants.jsm"
+    );
+`,
+    `
+    ChromeUtils.defineModuleGetter(
+      lazy, "AppConstants", "resource://gre/modules/AppConstants.jsm"
+    );
+`,
+    `
+    XPCOMUtils.defineLazyModuleGetters(lazy, {
+      AppConstants: "resource://gre/modules/AppConstants.jsm",
+    });
+`,
+    `
+    ChromeUtils.defineESModuleGetters(lazy, {
+      AppConstants: "resource://gre/modules/AppConstants.sys.mjs",
+    });
+`,
+    `
+    if (some_condition) {
+      ChromeUtils.import("resource://gre/modules/AppConstants.jsm");
+    }
+    XPCOMUtils.defineLazyModuleGetter(
+      lazy, "AppConstants", "resource://gre/modules/AppConstants.jsm"
+    );
+`,
+    `
+    ChromeUtils.import("resource://gre/modules/AppConstants.jsm");
+    XPCOMUtils.defineLazyModuleGetter(
+      sandbox, "AppConstants", "resource://gre/modules/AppConstants.jsm"
+    );
+`,
+    `
+    ChromeUtils.import("resource://gre/modules/AppConstants.jsm");
+    XPCOMUtils.defineLazyModuleGetters(sandbox, {
+      AppConstants: "resource://gre/modules/AppConstants.jsm",
+    });
+`,
+  ],
+  invalid: [
+    invalidCode(
+      `
+    ChromeUtils.import("resource://gre/modules/AppConstants.jsm");
+    XPCOMUtils.defineLazyModuleGetter(
+      lazy, "AppConstants", "resource://gre/modules/AppConstants.jsm"
+    );
+`,
+      "resource://gre/modules/AppConstants.jsm"
+    ),
+    invalidCode(
+      `
+    ChromeUtils.import("resource://gre/modules/AppConstants.jsm");
+    ChromeUtils.defineModuleGetter(
+      lazy, "AppConstants", "resource://gre/modules/AppConstants.jsm"
+    );
+`,
+      "resource://gre/modules/AppConstants.jsm"
+    ),
+    invalidCode(
+      `
+    ChromeUtils.import("resource://gre/modules/AppConstants.jsm");
+    XPCOMUtils.defineLazyModuleGetters(lazy, {
+      AppConstants: "resource://gre/modules/AppConstants.jsm",
+    });
+`,
+      "resource://gre/modules/AppConstants.jsm"
+    ),
+    invalidCode(
+      `
+    ChromeUtils.importESModule("resource://gre/modules/AppConstants.sys.mjs");
+    ChromeUtils.defineESModuleGetters(lazy, {
+      AppConstants: "resource://gre/modules/AppConstants.sys.mjs",
+    });
+`,
+      "resource://gre/modules/AppConstants.sys.mjs"
+    ),
+    invalidCode(
+      `
+    import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs";
+    ChromeUtils.defineESModuleGetters(lazy, {
+      AppConstants: "resource://gre/modules/AppConstants.sys.mjs",
+    });
+`,
+      "resource://gre/modules/AppConstants.sys.mjs"
+    ),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-multiple-getters-calls.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-multiple-getters-calls.js
new file mode 100644
index 0000000000..a2b88a8652
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-multiple-getters-calls.js
@@ -0,0 +1,60 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-multiple-getters-calls");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code) {
+  return { code, errors: [{ messageId: "rejectMultipleCalls" }] };
+}
+
+ruleTester.run("reject-multiple-getters-calls", rule, {
+  valid: [
+    `
+      ChromeUtils.defineESModuleGetters(lazy, {
+        AppConstants: "resource://gre/modules/AppConstants.sys.mjs",
+        PlacesUtils: "resource://gre/modules/PlacesUtils.sys.mjs",
+      });
+    `,
+    `
+      ChromeUtils.defineESModuleGetters(lazy, {
+        AppConstants: "resource://gre/modules/AppConstants.sys.mjs",
+      });
+      ChromeUtils.defineESModuleGetters(window, {
+        PlacesUtils: "resource://gre/modules/PlacesUtils.sys.mjs",
+      });
+    `,
+    `
+      ChromeUtils.defineESModuleGetters(lazy, {
+        AppConstants: "resource://gre/modules/AppConstants.sys.mjs",
+      });
+      if (cond) {
+        ChromeUtils.defineESModuleGetters(lazy, {
+          PlacesUtils: "resource://gre/modules/PlacesUtils.sys.mjs",
+        });
+      }
+    `,
+  ],
+  invalid: [
+    invalidCode(`
+      ChromeUtils.defineESModuleGetters(lazy, {
+        AppConstants: "resource://gre/modules/AppConstants.sys.mjs",
+      });
+      ChromeUtils.defineESModuleGetters(lazy, {
+        PlacesUtils: "resource://gre/modules/PlacesUtils.sys.mjs",
+      });
+    `),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-relative-requires.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-relative-requires.js
new file mode 100644
index 0000000000..e8ae58a557
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-relative-requires.js
@@ -0,0 +1,57 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-relative-requires");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidError() {
+  let message = "relative paths are not allowed with require()";
+  return [{ message, type: "CallExpression" }];
+}
+
+ruleTester.run("reject-relative-requires", rule, {
+  valid: [
+    'require("devtools/absolute/path")',
+    'require("resource://gre/modules/SomeModule.jsm")',
+    'loader.lazyRequireGetter(this, "path", "devtools/absolute/path", true)',
+    'loader.lazyRequireGetter(this, "Path", "devtools/absolute/path")',
+  ],
+  invalid: [
+    {
+      code: 'require("./relative/path")',
+      errors: invalidError(),
+    },
+    {
+      code: 'require("../parent/folder/path")',
+      errors: invalidError(),
+    },
+    {
+      code: 'loader.lazyRequireGetter(this, "path", "./relative/path", true)',
+      errors: invalidError(),
+    },
+    {
+      code: 'loader.lazyRequireGetter(this, "path", "../parent/folder/path", true)',
+      errors: invalidError(),
+    },
+    {
+      code: 'loader.lazyRequireGetter(this, "path", "./relative/path")',
+      errors: invalidError(),
+    },
+    {
+      code: 'loader.lazyRequireGetter(this, "path", "../parent/folder/path")',
+      errors: invalidError(),
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-scriptableunicodeconverter.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-scriptableunicodeconverter.js
new file mode 100644
index 0000000000..472f056f93
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-scriptableunicodeconverter.js
@@ -0,0 +1,33 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-scriptableunicodeconverter");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidError() {
+  let message =
+    "Ci.nsIScriptableUnicodeConverter is deprecated. You should use TextEncoder or TextDecoder instead.";
+  return [{ message, type: "MemberExpression" }];
+}
+
+ruleTester.run("reject-scriptableunicodeconverter", rule, {
+  valid: ["TextEncoder", "TextDecoder"],
+  invalid: [
+    {
+      code: "Ci.nsIScriptableUnicodeConverter",
+      errors: invalidError(),
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-some-requires.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-some-requires.js
new file mode 100644
index 0000000000..ccc7c48514
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-some-requires.js
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-some-requires");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function requirePathError(path) {
+  const message = `require(${path}) is not allowed`;
+  return [{ message, type: "CallExpression" }];
+}
+
+const DEVTOOLS_FORBIDDEN_PATH = "^(resource://)?devtools/forbidden";
+
+ruleTester.run("reject-some-requires", rule, {
+  valid: [
+    {
+      code: 'require("devtools/not-forbidden/path")',
+      options: [DEVTOOLS_FORBIDDEN_PATH],
+    },
+    {
+      code: 'require("resource://devtools/not-forbidden/path")',
+      options: [DEVTOOLS_FORBIDDEN_PATH],
+    },
+  ],
+  invalid: [
+    {
+      code: 'require("devtools/forbidden/path")',
+      errors: requirePathError("devtools/forbidden/path"),
+      options: [DEVTOOLS_FORBIDDEN_PATH],
+    },
+    {
+      code: 'require("resource://devtools/forbidden/path")',
+      errors: requirePathError("resource://devtools/forbidden/path"),
+      options: [DEVTOOLS_FORBIDDEN_PATH],
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-top-level-await.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-top-level-await.js
new file mode 100644
index 0000000000..4416b42abb
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-top-level-await.js
@@ -0,0 +1,36 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-top-level-await");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({
+  parserOptions: { ecmaVersion: "latest", sourceType: "module" },
+});
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, messageId) {
+  return { code, errors: [{ messageId: "rejectTopLevelAwait" }] };
+}
+
+ruleTester.run("reject-top-level-await", rule, {
+  valid: [
+    "async() => { await bar() }",
+    "async() => { for await (let x of []) {} }",
+  ],
+  invalid: [
+    invalidCode("await foo"),
+    invalidCode("{ await foo }"),
+    invalidCode("(await foo)"),
+    invalidCode("for await (let x of []) {}"),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/rejects-requires-await.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/rejects-requires-await.js
new file mode 100644
index 0000000000..a7e95769c1
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/rejects-requires-await.js
@@ -0,0 +1,32 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/rejects-requires-await");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, messageId) {
+  return { code, errors: [{ messageId: "rejectRequiresAwait" }] };
+}
+
+ruleTester.run("reject-requires-await", rule, {
+  valid: [
+    "async() => { await Assert.rejects(foo, /assertion/) }",
+    "async() => { await Assert.rejects(foo, /assertion/, 'msg') }",
+  ],
+  invalid: [
+    invalidCode("Assert.rejects(foo)"),
+    invalidCode("Assert.rejects(foo, 'msg')"),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/use-cc-etc.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-cc-etc.js
new file mode 100644
index 0000000000..8d0516cfc7
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-cc-etc.js
@@ -0,0 +1,60 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/use-cc-etc");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, originalName, newName, output) {
+  return {
+    code,
+    output,
+    errors: [
+      {
+        message: `Use ${newName} rather than ${originalName}`,
+        type: "MemberExpression",
+      },
+    ],
+  };
+}
+
+ruleTester.run("use-cc-etc", rule, {
+  valid: ["Components.Constructor();", "let x = Components.foo;"],
+  invalid: [
+    invalidCode(
+      "let foo = Components.classes['bar'];",
+      "Components.classes",
+      "Cc",
+      "let foo = Cc['bar'];"
+    ),
+    invalidCode(
+      "let bar = Components.interfaces.bar;",
+      "Components.interfaces",
+      "Ci",
+      "let bar = Ci.bar;"
+    ),
+    invalidCode(
+      "Components.results.NS_ERROR_ILLEGAL_INPUT;",
+      "Components.results",
+      "Cr",
+      "Cr.NS_ERROR_ILLEGAL_INPUT;"
+    ),
+    invalidCode(
+      "Components.utils.reportError('fake');",
+      "Components.utils",
+      "Cu",
+      "Cu.reportError('fake');"
+    ),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/use-chromeutils-generateqi.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-chromeutils-generateqi.js
new file mode 100644
index 0000000000..32e7012e4d
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-chromeutils-generateqi.js
@@ -0,0 +1,81 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/use-chromeutils-generateqi");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function callError(message) {
+  return [{ message, type: "CallExpression" }];
+}
+function error(message, type) {
+  return [{ message, type }];
+}
+
+const MSG_NO_JS_QUERY_INTERFACE =
+  "Please use ChromeUtils.generateQI rather than manually creating " +
+  "JavaScript QueryInterface functions";
+
+const MSG_NO_XPCOMUTILS_GENERATEQI =
+  "Please use ChromeUtils.generateQI instead of XPCOMUtils.generateQI";
+
+/* globals nsIFlug */
+function QueryInterface(iid) {
+  if (
+    iid.equals(Ci.nsISupports) ||
+    iid.equals(Ci.nsIMeh) ||
+    iid.equals(nsIFlug) ||
+    iid.equals(Ci.amIFoo)
+  ) {
+    return this;
+  }
+  throw Components.Exception("", Cr.NS_ERROR_NO_INTERFACE);
+}
+
+ruleTester.run("use-chromeutils-generateqi", rule, {
+  valid: [
+    `X.prototype.QueryInterface = ChromeUtils.generateQI(["nsIMeh"]);`,
+    `X.prototype = { QueryInterface: ChromeUtils.generateQI(["nsIMeh"]) }`,
+  ],
+  invalid: [
+    {
+      code: `X.prototype.QueryInterface = XPCOMUtils.generateQI(["nsIMeh"]);`,
+      output: `X.prototype.QueryInterface = ChromeUtils.generateQI(["nsIMeh"]);`,
+      errors: callError(MSG_NO_XPCOMUTILS_GENERATEQI),
+    },
+    {
+      code: `X.prototype = { QueryInterface: XPCOMUtils.generateQI(["nsIMeh"]) };`,
+      output: `X.prototype = { QueryInterface: ChromeUtils.generateQI(["nsIMeh"]) };`,
+      errors: callError(MSG_NO_XPCOMUTILS_GENERATEQI),
+    },
+    {
+      code: `X.prototype = { QueryInterface: ${QueryInterface} };`,
+      output: `X.prototype = { QueryInterface: ChromeUtils.generateQI(["nsIMeh", "nsIFlug", "amIFoo"]) };`,
+      errors: error(MSG_NO_JS_QUERY_INTERFACE, "Property"),
+    },
+    {
+      code: `X.prototype = { ${String(QueryInterface).replace(
+        /^function /,
+        ""
+      )} };`,
+      output: `X.prototype = { QueryInterface: ChromeUtils.generateQI(["nsIMeh", "nsIFlug", "amIFoo"]) };`,
+      errors: error(MSG_NO_JS_QUERY_INTERFACE, "Property"),
+    },
+    {
+      code: `X.prototype.QueryInterface = ${QueryInterface};`,
+      output: `X.prototype.QueryInterface = ChromeUtils.generateQI(["nsIMeh", "nsIFlug", "amIFoo"]);`,
+      errors: error(MSG_NO_JS_QUERY_INTERFACE, "AssignmentExpression"),
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/use-chromeutils-import.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-chromeutils-import.js
new file mode 100644
index 0000000000..f9aea6566a
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-chromeutils-import.js
@@ -0,0 +1,65 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/use-chromeutils-import");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function callError(message) {
+  return [{ message, type: "CallExpression" }];
+}
+
+const MESSAGE_IMPORT = "Please use ChromeUtils.import instead of Cu.import";
+const MESSAGE_DEFINE =
+  "Please use ChromeUtils.defineModuleGetter instead of " +
+  "XPCOMUtils.defineLazyModuleGetter";
+
+ruleTester.run("use-chromeutils-import", rule, {
+  valid: [
+    `ChromeUtils.import("resource://gre/modules/AppConstants.jsm");`,
+    `ChromeUtils.import("resource://gre/modules/AppConstants.jsm", this);`,
+    `ChromeUtils.defineModuleGetter(this, "AppConstants",
+                                    "resource://gre/modules/AppConstants.jsm");`,
+    `XPCOMUtils.defineLazyModuleGetter(this, "AppConstants",
+                                       "resource://gre/modules/AppConstants.jsm",
+                                       "Foo");`,
+    `XPCOMUtils.defineLazyModuleGetter(this, "AppConstants",
+                                       "resource://gre/modules/AppConstants.jsm",
+                                       undefined, preAppConstantsLambda);`,
+  ],
+  invalid: [
+    {
+      code: `Cu.import("resource://gre/modules/AppConstants.jsm");`,
+      output: `ChromeUtils.import("resource://gre/modules/AppConstants.jsm");`,
+      errors: callError(MESSAGE_IMPORT),
+    },
+    {
+      code: `Cu.import("resource://gre/modules/AppConstants.jsm", this);`,
+      output: `ChromeUtils.import("resource://gre/modules/AppConstants.jsm", this);`,
+      errors: callError(MESSAGE_IMPORT),
+    },
+    {
+      code: `Components.utils.import("resource://gre/modules/AppConstants.jsm");`,
+      output: `ChromeUtils.import("resource://gre/modules/AppConstants.jsm");`,
+      errors: callError(MESSAGE_IMPORT),
+    },
+    {
+      code: `XPCOMUtils.defineLazyModuleGetter(this, "AppConstants",
+                                               "resource://gre/modules/AppConstants.jsm");`,
+      output: `ChromeUtils.defineModuleGetter(this, "AppConstants",
+                                               "resource://gre/modules/AppConstants.jsm");`,
+      errors: callError(MESSAGE_DEFINE),
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/use-default-preference-values.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-default-preference-values.js
new file mode 100644
index 0000000000..9aa37b1578
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-default-preference-values.js
@@ -0,0 +1,41 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/use-default-preference-values");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code) {
+  let message = "provide a default value instead of using a try/catch block";
+  return { code, errors: [{ message, type: "TryStatement" }] };
+}
+
+let types = ["Bool", "Char", "Float", "Int"];
+let methods = types.map(type => "get" + type + "Pref");
+
+ruleTester.run("use-default-preference-values", rule, {
+  valid: [].concat(
+    methods.map(m => "blah = branch." + m + "('blah', true);"),
+    methods.map(m => "blah = branch." + m + "('blah');"),
+    methods.map(
+      m => "try { canThrow(); blah = branch." + m + "('blah'); } catch(e) {}"
+    )
+  ),
+
+  invalid: [].concat(
+    methods.map(m =>
+      invalidCode("try { blah = branch." + m + "('blah'); } catch(e) {}")
+    )
+  ),
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/use-includes-instead-of-indexOf.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-includes-instead-of-indexOf.js
new file mode 100644
index 0000000000..0979a99ed7
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-includes-instead-of-indexOf.js
@@ -0,0 +1,38 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/use-includes-instead-of-indexOf");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code) {
+  let message = "use .includes instead of .indexOf";
+  return { code, errors: [{ message, type: "BinaryExpression" }] };
+}
+
+ruleTester.run("use-includes-instead-of-indexOf", rule, {
+  valid: [
+    "let a = foo.includes(bar);",
+    "let a = foo.indexOf(bar) > 0;",
+    "let a = foo.indexOf(bar) != 0;",
+  ],
+  invalid: [
+    invalidCode("let a = foo.indexOf(bar) >= 0;"),
+    invalidCode("let a = foo.indexOf(bar) != -1;"),
+    invalidCode("let a = foo.indexOf(bar) !== -1;"),
+    invalidCode("let a = foo.indexOf(bar) == -1;"),
+    invalidCode("let a = foo.indexOf(bar) === -1;"),
+    invalidCode("let a = foo.indexOf(bar) < 0;"),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/use-isInstance.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-isInstance.js
new file mode 100644
index 0000000000..13ca3580ad
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-isInstance.js
@@ -0,0 +1,130 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/use-isInstance");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+const errors = [
+  {
+    message:
+      "Please prefer .isInstance() in chrome scripts over the standard instanceof operator for DOM interfaces, " +
+      "since the latter will return false when the object is created from a different context.",
+    type: "BinaryExpression",
+  },
+];
+
+const env = { browser: true };
+
+/**
+ * A test case boilerplate simulating chrome privileged script.
+ * @param {string} code
+ */
+function mockChromeScript(code) {
+  return {
+    code,
+    filename: "foo.sys.mjs",
+    env,
+  };
+}
+
+/**
+ * A test case boilerplate simulating content script.
+ * @param {string} code
+ */
+function mockContentScript(code) {
+  return {
+    code,
+    filename: "foo.js",
+    env,
+  };
+}
+
+ruleTester.run("use-isInstance", rule, {
+  valid: [
+    mockChromeScript("(() => {}) instanceof Function;"),
+    mockChromeScript("({}) instanceof Object;"),
+    mockChromeScript("Node instanceof Object;"),
+    mockChromeScript("node instanceof lazy.Node;"),
+    mockChromeScript("var Node;node instanceof Node;"),
+    mockChromeScript("file instanceof lazy.File;"),
+    mockChromeScript("file instanceof OS.File;"),
+    mockChromeScript("file instanceof OS.File.Error;"),
+    mockChromeScript("file instanceof lazy.OS.File;"),
+    mockChromeScript("file instanceof lazy.OS.File.Error;"),
+    mockChromeScript("file instanceof lazy.lazy.OS.File;"),
+    mockChromeScript("var File;file instanceof File;"),
+    mockChromeScript("foo instanceof RandomGlobalThing;"),
+    mockChromeScript("foo instanceof lazy.RandomGlobalThing;"),
+    mockContentScript("node instanceof Node;"),
+    mockContentScript("file instanceof File;"),
+    mockContentScript(
+      "SpecialPowers.ChromeUtils.import(''); file instanceof File;"
+    ),
+  ],
+  invalid: [
+    {
+      code: "node instanceof Node",
+      output: "Node.isInstance(node)",
+      env,
+      errors,
+      filename: "foo.sys.mjs",
+    },
+    {
+      code: "text instanceof win.Text",
+      output: "win.Text.isInstance(text)",
+      errors,
+      filename: "foo.sys.mjs",
+    },
+    {
+      code: "target instanceof this.contentWindow.HTMLAudioElement",
+      output: "this.contentWindow.HTMLAudioElement.isInstance(target)",
+      errors,
+      filename: "foo.sys.mjs",
+    },
+    {
+      code: "target instanceof File",
+      output: "File.isInstance(target)",
+      env,
+      errors,
+      filename: "foo.sys.mjs",
+    },
+    {
+      code: "target instanceof win.File",
+      output: "win.File.isInstance(target)",
+      errors,
+      filename: "foo.sys.mjs",
+    },
+    {
+      code: "window.arguments[0] instanceof window.XULElement",
+      output: "window.XULElement.isInstance(window.arguments[0])",
+      errors,
+      filename: "foo.sys.mjs",
+    },
+    {
+      code: "ChromeUtils.import(''); node instanceof Node",
+      output: "ChromeUtils.import(''); Node.isInstance(node)",
+      env,
+      errors,
+      filename: "foo.js",
+    },
+    {
+      code: "ChromeUtils.import(''); file instanceof File",
+      output: "ChromeUtils.import(''); File.isInstance(file)",
+      env,
+      errors,
+      filename: "foo.js",
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/use-ownerGlobal.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-ownerGlobal.js
new file mode 100644
index 0000000000..372d9dbb25
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-ownerGlobal.js
@@ -0,0 +1,35 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/use-ownerGlobal");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code) {
+  let message = "use .ownerGlobal instead of .ownerDocument.defaultView";
+  return { code, errors: [{ message, type: "MemberExpression" }] };
+}
+
+ruleTester.run("use-ownerGlobal", rule, {
+  valid: [
+    "aEvent.target.ownerGlobal;",
+    "this.DOMPointNode.ownerGlobal.getSelection();",
+    "windowToMessageManager(node.ownerGlobal);",
+  ],
+  invalid: [
+    invalidCode("aEvent.target.ownerDocument.defaultView;"),
+    invalidCode("this.DOMPointNode.ownerDocument.defaultView.getSelection();"),
+    invalidCode("windowToMessageManager(node.ownerDocument.defaultView);"),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/use-returnValue.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-returnValue.js
new file mode 100644
index 0000000000..836d383ef2
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-returnValue.js
@@ -0,0 +1,39 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/use-returnValue");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, methodName) {
+  let message = `{Array/String}.${methodName} doesn't modify the instance in-place`;
+  return { code, errors: [{ message, type: "ExpressionStatement" }] };
+}
+
+ruleTester.run("use-returnValue", rule, {
+  valid: [
+    "a = foo.concat(bar)",
+    "b = bar.concat([1,3,4])",
+    "c = baz.concat()",
+    "d = qux.join(' ')",
+    "e = quux.slice(1)",
+  ],
+  invalid: [
+    invalidCode("foo.concat(bar)", "concat"),
+    invalidCode("bar.concat([1,3,4])", "concat"),
+    invalidCode("baz.concat()", "concat"),
+    invalidCode("qux.join(' ')", "join"),
+    invalidCode("quux.slice(1)", "slice"),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/use-services.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-services.js
new file mode 100644
index 0000000000..7c6b95a640
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-services.js
@@ -0,0 +1,60 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/use-services");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, name, replaces, type = "CallExpression") {
+  let message = `Use Services.${name} rather than ${replaces}.`;
+  return { code, errors: [{ message, type }] };
+}
+
+ruleTester.run("use-services", rule, {
+  valid: [
+    'Cc["@mozilla.org/fakeservice;1"].getService(Ci.nsIFake)',
+    'Components.classes["@mozilla.org/fakeservice;1"].getService(Components.interfaces.nsIFake)',
+    "Services.wm.addListener()",
+  ],
+  invalid: [
+    invalidCode(
+      'Cc["@mozilla.org/appshell/window-mediator;1"].getService(Ci.nsIWindowMediator);',
+      "wm",
+      "getService()"
+    ),
+    invalidCode(
+      'Components.classes["@mozilla.org/toolkit/app-startup;1"].getService(Components.interfaces.nsIAppStartup);',
+      "startup",
+      "getService()"
+    ),
+    invalidCode(
+      `XPCOMUtils.defineLazyServiceGetters(this, {
+         uuidGen: ["@mozilla.org/uuid-generator;1", "nsIUUIDGenerator"],
+       });`,
+      "uuid",
+      "defineLazyServiceGetters",
+      "ArrayExpression"
+    ),
+    invalidCode(
+      `XPCOMUtils.defineLazyServiceGetter(
+         this,
+         "gELS",
+         "@mozilla.org/eventlistenerservice;1",
+         "nsIEventListenerService"
+       );`,
+      "els",
+      "defineLazyServiceGetter"
+    ),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/use-static-import.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-static-import.js
new file mode 100644
index 0000000000..656e83e0e9
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-static-import.js
@@ -0,0 +1,80 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/use-static-import");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({
+  parserOptions: { ecmaVersion: "latest", sourceType: "module" },
+});
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function callError() {
+  return [{ messageId: "useStaticImport", type: "VariableDeclaration" }];
+}
+
+ruleTester.run("use-static-import", rule, {
+  valid: [
+    {
+      // Already converted, no issues.
+      code: 'import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";',
+      filename: "test.sys.mjs",
+    },
+    {
+      // Inside an if statement.
+      code: 'if (foo) { const { XPCOMUtils } = ChromeUtils.importESModule("resource://gre/modules/XPCOMUtils.sys.mjs") }',
+      filename: "test.sys.mjs",
+    },
+    {
+      // Inside a function.
+      code: 'function foo() { const { XPCOMUtils } = ChromeUtils.importESModule("resource://gre/modules/XPCOMUtils.sys.mjs") }',
+      filename: "test.sys.mjs",
+    },
+    {
+      // importESModule with two args cannot be converted.
+      code: 'const { f } = ChromeUtils.importESModule("some/module.sys.mjs", { loadInDevToolsLoader : true });',
+      filename: "test.sys.mjs",
+    },
+    {
+      // A non-system file attempting to import a system file should not be
+      // converted.
+      code: 'const { XPCOMUtils } = ChromeUtils.importESModule("resource://gre/modules/XPCOMUtils.sys.mjs")',
+      filename: "test.mjs",
+    },
+  ],
+  invalid: [
+    {
+      // Simple import in system module should be converted.
+      code: 'const { XPCOMUtils } = ChromeUtils.importESModule("resource://gre/modules/XPCOMUtils.sys.mjs")',
+      errors: callError(),
+      filename: "test.sys.mjs",
+      output:
+        'import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs"',
+    },
+    {
+      // Should handle rewritten variables as well.
+      code: 'const { XPCOMUtils: foo } = ChromeUtils.importESModule("resource://gre/modules/XPCOMUtils.sys.mjs")',
+      errors: callError(),
+      filename: "test.sys.mjs",
+      output:
+        'import { XPCOMUtils as foo } from "resource://gre/modules/XPCOMUtils.sys.mjs"',
+    },
+    {
+      // Should handle multiple variables.
+      code: 'const { foo, XPCOMUtils } = ChromeUtils.importESModule("resource://gre/modules/XPCOMUtils.sys.mjs")',
+      errors: callError(),
+      filename: "test.sys.mjs",
+      output:
+        'import { foo, XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs"',
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/valid-ci-uses.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/valid-ci-uses.js
new file mode 100644
index 0000000000..0f5fe2eadf
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/valid-ci-uses.js
@@ -0,0 +1,58 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var os = require("os");
+var rule = require("../lib/rules/valid-ci-uses");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, messageId, data) {
+  return { code, errors: [{ messageId, data }] };
+}
+
+process.env.MOZ_XPT_ARTIFACTS_DIR = `${__dirname}/xpidl`;
+
+const tests = {
+  valid: ["Ci.nsIURIFixup", "Ci.nsIURIFixup.FIXUP_FLAG_NONE"],
+  invalid: [
+    invalidCode("Ci.nsIURIFixup.UNKNOWN_CONSTANT", "unknownProperty", {
+      interface: "nsIURIFixup",
+      property: "UNKNOWN_CONSTANT",
+    }),
+    invalidCode("Ci.nsIFoo", "unknownInterface", {
+      interface: "nsIFoo",
+    }),
+  ],
+};
+
+// For ESLint tests, we only have a couple of xpt examples in the xpidl directory.
+// Therefore we can pretend that these interfaces no longer exist.
+switch (os.platform) {
+  case "windows":
+    tests.invalid.push(
+      invalidCode("Ci.nsIJumpListShortcut", "missingInterface")
+    );
+    break;
+  case "darwin":
+    tests.invalid.push(
+      invalidCode("Ci.nsIMacShellService", "missingInterface")
+    );
+    break;
+  case "linux":
+    tests.invalid.push(
+      invalidCode("Ci.mozISandboxReporter", "missingInterface")
+    );
+}
+
+ruleTester.run("valid-ci-uses", rule, tests);
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/valid-lazy.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/valid-lazy.js
new file mode 100644
index 0000000000..3b698afcf9
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/valid-lazy.js
@@ -0,0 +1,176 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/valid-lazy");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, name, messageId) {
+  return { code, errors: [{ messageId, data: { name } }] };
+}
+
+ruleTester.run("valid-lazy", rule, {
+  // Note: these tests build on top of one another, although lazy gets
+  // re-declared, it
+  valid: [
+    `
+      const lazy = {};
+      XPCOMUtils.defineLazyGetter(lazy, "foo", () => {});
+      if (x) { lazy.foo.bar(); }
+    `,
+    `
+      const lazy = {};
+      ChromeUtils.defineLazyGetter(lazy, "foo", () => {});
+      if (x) { lazy.foo.bar(); }
+    `,
+    `
+      const lazy = {};
+      XPCOMUtils.defineLazyModuleGetters(lazy, {
+        foo: "foo.jsm",
+      });
+      if (x) { lazy.foo.bar(); }
+    `,
+    `
+      const lazy = {};
+      ChromeUtils.defineESModuleGetters(lazy, {
+        foo: "foo.mjs",
+      });
+      if (x) { lazy.foo.bar(); }
+    `,
+    `
+      const lazy = {};
+      Integration.downloads.defineESModuleGetter(lazy, "foo", "foo.sys.mjs");
+      if (x) { lazy.foo.bar(); }
+    `,
+    `
+      const lazy = createLazyLoaders({ foo: () => {}});
+      if (x) { lazy.foo.bar(); }
+    `,
+    `
+      const lazy = {};
+      loader.lazyRequireGetter(
+        lazy,
+        ["foo1", "foo2"],
+        "bar",
+        true
+      );
+      if (x) {
+        lazy.foo1.bar();
+        lazy.foo2.bar();
+      }
+    `,
+    // Test for top-level unconditional.
+    `
+      const lazy = {};
+      XPCOMUtils.defineLazyGetter(lazy, "foo", () => {});
+      if (x) { lazy.foo.bar(); }
+      for (;;) { lazy.foo.bar(); }
+      for (var x in y) { lazy.foo.bar(); }
+      for (var x of y) { lazy.foo.bar(); }
+      while (true) { lazy.foo.bar(); }
+      do { lazy.foo.bar(); } while (true);
+      switch (x) { case 1: lazy.foo.bar(); }
+      try { lazy.foo.bar(); } catch (e) {}
+      function f() { lazy.foo.bar(); }
+      (function f() { lazy.foo.bar(); });
+      () => { lazy.foo.bar(); };
+      class C {
+        constructor() { lazy.foo.bar(); }
+        foo() { lazy.foo.bar(); }
+        get x() { lazy.foo.bar(); }
+        set x(v) { lazy.foo.bar(); }
+        a = lazy.foo.bar();
+        #b = lazy.foo.bar();
+        static {
+          lazy.foo.bar();
+        }
+      }
+      a && lazy.foo.bar();
+      a || lazy.foo.bar();
+      a ?? lazy.foo.bar();
+      a ? lazy.foo.bar() : b;
+      a?.b[lazy.foo.bar()];
+      a ||= lazy.foo.bar();
+      a &&= lazy.foo.bar();
+      a ??= lazy.foo.bar();
+      var { x = lazy.foo.bar() } = {};
+      var [ y = lazy.foo.bar() ] = [];
+    `,
+  ],
+  invalid: [
+    invalidCode("if (x) { lazy.bar; }", "bar", "unknownProperty"),
+    invalidCode(
+      `
+        const lazy = {};
+        XPCOMUtils.defineLazyGetter(lazy, "foo", "foo.jsm");
+        XPCOMUtils.defineLazyGetter(lazy, "foo", "foo1.jsm");
+        if (x) { lazy.foo.bar(); }
+      `,
+      "foo",
+      "duplicateSymbol"
+    ),
+    invalidCode(
+      `
+        const lazy = {};
+        XPCOMUtils.defineLazyGetter(lazy, "foo", "foo.jsm");
+        ChromeUtils.defineLazyGetter(lazy, "foo", "foo1.jsm");
+        if (x) { lazy.foo.bar(); }
+      `,
+      "foo",
+      "duplicateSymbol"
+    ),
+    invalidCode(
+      `
+        const lazy = {};
+        ChromeUtils.defineLazyGetter(lazy, "foo", "foo.jsm");
+        ChromeUtils.defineLazyGetter(lazy, "foo", "foo1.jsm");
+        if (x) { lazy.foo.bar(); }
+      `,
+      "foo",
+      "duplicateSymbol"
+    ),
+    invalidCode(
+      `
+        const lazy = {};
+        XPCOMUtils.defineLazyModuleGetters(lazy, {
+          "foo-bar": "foo.jsm",
+        });
+        if (x) { lazy["foo-bar"].bar(); }
+      `,
+      "foo-bar",
+      "incorrectType"
+    ),
+    invalidCode(
+      `const lazy = {};
+       XPCOMUtils.defineLazyGetter(lazy, "foo", "foo.jsm");
+      `,
+      "foo",
+      "unusedProperty"
+    ),
+    invalidCode(
+      `const lazy = {};
+      XPCOMUtils.defineLazyGetter(lazy, "foo1", () => {});
+      lazy.foo1.bar();`,
+      "foo1",
+      "topLevelAndUnconditional"
+    ),
+    invalidCode(
+      `const lazy = {};
+      XPCOMUtils.defineLazyGetter(lazy, "foo1", () => {});
+      { x = -f(1 + lazy.foo1.bar()); }`,
+      "foo1",
+      "topLevelAndUnconditional"
+    ),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/valid-services-property.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/valid-services-property.js
new file mode 100644
index 0000000000..a9806ccc72
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/valid-services-property.js
@@ -0,0 +1,42 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/valid-services-property");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, messageId, data) {
+  return { code, errors: [{ messageId, data }] };
+}
+
+process.env.MOZ_XPT_ARTIFACTS_DIR = `${__dirname}/xpidl`;
+
+ruleTester.run("valid-services-property", rule, {
+  valid: [
+    "Services.uriFixup.keywordToURI()",
+    "Services.uriFixup.FIXUP_FLAG_NONE",
+  ],
+  invalid: [
+    invalidCode("Services.uriFixup.UNKNOWN_CONSTANT", "unknownProperty", {
+      alias: "uriFixup",
+      propertyName: "UNKNOWN_CONSTANT",
+      checkedInterfaces: ["nsIURIFixup"],
+    }),
+    invalidCode("Services.uriFixup.foo()", "unknownProperty", {
+      alias: "uriFixup",
+      propertyName: "foo",
+      checkedInterfaces: ["nsIURIFixup"],
+    }),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/valid-services.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/valid-services.js
new file mode 100644
index 0000000000..71ad2adfcc
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/valid-services.js
@@ -0,0 +1,33 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/valid-services");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, name) {
+  let message = `Unknown Services member property ${name}`;
+  return { code, errors: [{ message }] };
+}
+
+ruleTester.run("valid-services", rule, {
+  valid: ["Services.crashmanager", "lazy.Services.crashmanager"],
+  invalid: [
+    invalidCode("Services.foo", "foo"),
+    invalidCode("Services.foo()", "foo"),
+    invalidCode("lazy.Services.foo", "foo"),
+    invalidCode("Services.foo.bar()", "foo"),
+    invalidCode("lazy.Services.foo.bar()", "foo"),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/xpidl/docshell.xpt b/tools/lint/eslint/eslint-plugin-mozilla/tests/xpidl/docshell.xpt
new file mode 100644
index 0000000000..abb593296b
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/xpidl/docshell.xpt
@@ -0,0 +1,6077 @@
+[
+  {
+    "consts": [
+      {
+        "name": "ePrompt",
+        "type": {
+          "tag": "TD_UINT8"
+        },
+        "value": 0
+      },
+      {
+        "name": "eDontPromptAndDontUnload",
+        "type": {
+          "tag": "TD_UINT8"
+        },
+        "value": 1
+      },
+      {
+        "name": "eDontPromptAndUnload",
+        "type": {
+          "tag": "TD_UINT8"
+        },
+        "value": 2
+      },
+      {
+        "name": "eAllowNavigation",
+        "type": {
+          "tag": "TD_UINT8"
+        },
+        "value": 0
+      },
+      {
+        "name": "eRequestBlockNavigation",
+        "type": {
+          "tag": "TD_UINT8"
+        },
+        "value": 1
+      },
+      {
+        "name": "eDelayResize",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 1
+      }
+    ],
+    "flags": [
+      "builtinclass"
+    ],
+    "methods": [
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "init",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_VOID"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_VOID"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_VOID"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "container",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "name": "nsIDocShell",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "setter"
+        ],
+        "name": "container",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsIDocShell",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "loadStart",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "headerFile": "mozilla/dom/Document.h",
+              "name": "Document",
+              "native": "mozilla::dom::Document",
+              "tag": "TD_DOMOBJECT"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "loadComplete",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_UINT32"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hidden",
+          "hasretval"
+        ],
+        "name": "loadCompleted",
+        "params": []
+      },
+      {
+        "flags": [
+          "getter",
+          "hidden",
+          "hasretval"
+        ],
+        "name": "isStopped",
+        "params": []
+      },
+      {
+        "flags": [
+          "hasretval"
+        ],
+        "name": "permitUnload",
+        "params": [
+          {
+            "flags": [
+              "in",
+              "optional"
+            ],
+            "type": {
+              "tag": "TD_UINT8"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "inPermitUnload",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "dispatchBeforeUnload",
+        "params": []
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "beforeUnloadFiring",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "pageHide",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "close",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsISHEntry",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "destroy",
+        "params": []
+      },
+      {
+        "flags": [],
+        "name": "stop",
+        "params": []
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "DOMDocument",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "headerFile": "mozilla/dom/Document.h",
+              "name": "Document",
+              "native": "mozilla::dom::Document",
+              "tag": "TD_DOMOBJECT"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "getDocument",
+        "params": []
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "setDocument",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "headerFile": "mozilla/dom/Document.h",
+              "name": "Document",
+              "native": "mozilla::dom::Document",
+              "tag": "TD_DOMOBJECT"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "getBounds",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_VOID"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "setBounds",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_VOID"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "setBoundsWithFlags",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_VOID"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_UINT32"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hidden",
+          "hasretval"
+        ],
+        "name": "previousViewer",
+        "params": []
+      },
+      {
+        "flags": [
+          "setter",
+          "hidden"
+        ],
+        "name": "previousViewer",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsIContentViewer",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "move",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_INT32"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_INT32"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "show",
+        "params": []
+      },
+      {
+        "flags": [],
+        "name": "hide",
+        "params": []
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "sticky",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "setter"
+        ],
+        "name": "sticky",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "open",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsISupports",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsISHEntry",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "clearHistoryEntry",
+        "params": []
+      },
+      {
+        "flags": [],
+        "name": "setPageModeForTesting",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsIPrintSettings",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "setPrintSettingsForSubdocument",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsIPrintSettings",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_VOID"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "historyEntry",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "name": "nsISHEntry",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "isTabModalPromptAllowed",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "isHidden",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "setter"
+        ],
+        "name": "isHidden",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hidden",
+          "hasretval"
+        ],
+        "name": "presShell",
+        "params": []
+      },
+      {
+        "flags": [
+          "getter",
+          "hidden",
+          "hasretval"
+        ],
+        "name": "presContext",
+        "params": []
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "setDocumentInternal",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "headerFile": "mozilla/dom/Document.h",
+              "name": "Document",
+              "native": "mozilla::dom::Document",
+              "tag": "TD_DOMOBJECT"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "findContainerView",
+        "params": []
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "setNavigationTiming",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_VOID"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "deviceFullZoomForTest",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_FLOAT"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "authorStyleDisabled",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "setter"
+        ],
+        "name": "authorStyleDisabled",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "getContentSize",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT32"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT32"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "getContentSizeConstrained",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_INT32"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_INT32"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT32"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT32"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "getReloadEncodingAndSource",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT32"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "setReloadEncodingAndSource",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_VOID"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_INT32"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "forgetReloadEncoding",
+        "params": []
+      }
+    ],
+    "name": "nsIContentViewer",
+    "parent": "nsISupports",
+    "uuid": "2da17016-7851-4a45-a7a8-00b360e01595"
+  },
+  {
+    "consts": [
+      {
+        "name": "COPY_IMAGE_TEXT",
+        "type": {
+          "tag": "TD_INT32"
+        },
+        "value": 1
+      },
+      {
+        "name": "COPY_IMAGE_HTML",
+        "type": {
+          "tag": "TD_INT32"
+        },
+        "value": 2
+      },
+      {
+        "name": "COPY_IMAGE_DATA",
+        "type": {
+          "tag": "TD_INT32"
+        },
+        "value": 4
+      },
+      {
+        "name": "COPY_IMAGE_ALL",
+        "type": {
+          "tag": "TD_INT32"
+        },
+        "value": -1
+      }
+    ],
+    "flags": [],
+    "methods": [
+      {
+        "flags": [],
+        "name": "clearSelection",
+        "params": []
+      },
+      {
+        "flags": [],
+        "name": "selectAll",
+        "params": []
+      },
+      {
+        "flags": [],
+        "name": "copySelection",
+        "params": []
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "copyable",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "copyLinkLocation",
+        "params": []
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "inLink",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "copyImage",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_INT32"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "inImage",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hasretval"
+        ],
+        "name": "getContents",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_PSTRING"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_ASTRING"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "canGetContents",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "setCommandNode",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "headerFile": "nsIContent.h",
+              "name": "Node",
+              "native": "nsINode",
+              "tag": "TD_DOMOBJECT"
+            }
+          }
+        ]
+      }
+    ],
+    "name": "nsIContentViewerEdit",
+    "parent": "nsISupports",
+    "uuid": "35be2d7e-f29b-48ec-bf7e-80a30a724de3"
+  },
+  {
+    "consts": [
+      {
+        "name": "ENUMERATE_FORWARDS",
+        "type": {
+          "tag": "TD_UINT8"
+        },
+        "value": 0
+      },
+      {
+        "name": "ENUMERATE_BACKWARDS",
+        "type": {
+          "tag": "TD_UINT8"
+        },
+        "value": 1
+      },
+      {
+        "name": "APP_TYPE_UNKNOWN",
+        "type": {
+          "tag": "TD_UINT8"
+        },
+        "value": 0
+      },
+      {
+        "name": "APP_TYPE_MAIL",
+        "type": {
+          "tag": "TD_UINT8"
+        },
+        "value": 1
+      },
+      {
+        "name": "APP_TYPE_EDITOR",
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+        "name": "webNavigationFlagsToFixupFlags",
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+            ],
+            "type": {
+              "tag": "TD_JSVAL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hasretval"
+        ],
+        "name": "isDomainKnown",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_UTF8STRING"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      }
+    ],
+    "name": "nsIURIFixup",
+    "parent": "nsISupports",
+    "uuid": "1da7e9d4-620b-4949-849a-1cd6077b1b2d"
+  },
+  {
+    "consts": [
+      {
+        "name": "LOAD_FLAGS_MASK",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 65535
+      },
+      {
+        "name": "LOAD_FLAGS_NONE",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 0
+      },
+      {
+        "name": "LOAD_FLAGS_IS_REFRESH",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 16
+      },
+      {
+        "name": "LOAD_FLAGS_IS_LINK",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 32
+      },
+      {
+        "name": "LOAD_FLAGS_BYPASS_HISTORY",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 64
+      },
+      {
+        "name": "LOAD_FLAGS_REPLACE_HISTORY",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 128
+      },
+      {
+        "name": "LOAD_FLAGS_BYPASS_CACHE",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 256
+      },
+      {
+        "name": "LOAD_FLAGS_BYPASS_PROXY",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 512
+      },
+      {
+        "name": "LOAD_FLAGS_CHARSET_CHANGE",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 1024
+      },
+      {
+        "name": "LOAD_FLAGS_STOP_CONTENT",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 2048
+      },
+      {
+        "name": "LOAD_FLAGS_FROM_EXTERNAL",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 4096
+      },
+      {
+        "name": "LOAD_FLAGS_FIRST_LOAD",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 16384
+      },
+      {
+        "name": "LOAD_FLAGS_ALLOW_POPUPS",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 32768
+      },
+      {
+        "name": "LOAD_FLAGS_BYPASS_CLASSIFIER",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 65536
+      },
+      {
+        "name": "LOAD_FLAGS_FORCE_ALLOW_COOKIES",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 131072
+      },
+      {
+        "name": "LOAD_FLAGS_DISALLOW_INHERIT_PRINCIPAL",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 262144
+      },
+      {
+        "name": "LOAD_FLAGS_ERROR_LOAD_CHANGES_RV",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 524288
+      },
+      {
+        "name": "LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 1048576
+      },
+      {
+        "name": "LOAD_FLAGS_FIXUP_SCHEME_TYPOS",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 2097152
+      },
+      {
+        "name": "LOAD_FLAGS_FORCE_ALLOW_DATA_URI",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 4194304
+      },
+      {
+        "name": "LOAD_FLAGS_IS_REDIRECT",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 8388608
+      },
+      {
+        "name": "LOAD_FLAGS_DISABLE_TRR",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 16777216
+      },
+      {
+        "name": "LOAD_FLAGS_FORCE_TRR",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 33554432
+      },
+      {
+        "name": "LOAD_FLAGS_BYPASS_LOAD_URI_DELEGATE",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 67108864
+      },
+      {
+        "name": "LOAD_FLAGS_USER_ACTIVATION",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 134217728
+      },
+      {
+        "name": "STOP_NETWORK",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 1
+      },
+      {
+        "name": "STOP_CONTENT",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 2
+      },
+      {
+        "name": "STOP_ALL",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 3
+      }
+    ],
+    "flags": [
+      "builtinclass"
+    ],
+    "methods": [
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "canGoBack",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "canGoForward",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "goBack",
+        "params": [
+          {
+            "flags": [
+              "in",
+              "optional"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          },
+          {
+            "flags": [
+              "in",
+              "optional"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "goForward",
+        "params": [
+          {
+            "flags": [
+              "in",
+              "optional"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          },
+          {
+            "flags": [
+              "in",
+              "optional"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "gotoIndex",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_INT32"
+            }
+          },
+          {
+            "flags": [
+              "in",
+              "optional"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "jscontext"
+        ],
+        "name": "loadURI",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_ASTRING"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_JSVAL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "binaryLoadURI",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_ASTRING"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_VOID"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "reload",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_UINT32"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "stop",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_UINT32"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "document",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "headerFile": "mozilla/dom/Document.h",
+              "name": "Document",
+              "native": "mozilla::dom::Document",
+              "tag": "TD_DOMOBJECT"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "currentURI",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "name": "nsIURI",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "sessionHistory",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "name": "nsISupports",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "resumeRedirectedLoad",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_UINT64"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_INT32"
+            }
+          }
+        ]
+      }
+    ],
+    "name": "nsIWebNavigation",
+    "parent": "nsISupports",
+    "uuid": "3ade79d4-8cb9-4952-b18d-4f9b63ca0d31"
+  },
+  {
+    "consts": [
+      {
+        "name": "UNSUPPORTED",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 0
+      },
+      {
+        "name": "IMAGE",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 1
+      },
+      {
+        "name": "FALLBACK",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 2
+      },
+      {
+        "name": "OTHER",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 32768
+      }
+    ],
+    "flags": [],
+    "methods": [
+      {
+        "flags": [
+          "hasretval"
+        ],
+        "name": "isTypeSupported",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_CSTRING"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_UINT32"
+            }
+          }
+        ]
+      }
+    ],
+    "name": "nsIWebNavigationInfo",
+    "parent": "nsISupports",
+    "uuid": "62a93afb-93a1-465c-84c8-0432264229de"
+  },
+  {
+    "consts": [],
+    "flags": [],
+    "methods": [
+      {
+        "flags": [],
+        "name": "loadPageAsViewSource",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsIDocShell",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_ASTRING"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "currentDescriptor",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "name": "nsISupports",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      }
+    ],
+    "name": "nsIWebPageDescriptor",
+    "parent": "nsISupports",
+    "uuid": "6f30b676-3710-4c2c-80b1-0395fb26516e"
+  }
+]
\ No newline at end of file
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/xpidl/xpcom_base.xpt b/tools/lint/eslint/eslint-plugin-mozilla/tests/xpidl/xpcom_base.xpt
new file mode 100644
index 0000000000..943b2c8e87
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/xpidl/xpcom_base.xpt
@@ -0,0 +1,3197 @@
+[
+  {
+    "consts": [],
+    "flags": [],
+    "methods": [
+      {
+        "flags": [],
+        "name": "unloadTabAsync",
+        "params": []
+      }
+    ],
+    "name": "nsITabUnloader",
+    "parent": "nsISupports",
+    "uuid": "2e530956-6054-464f-9f4c-0ae6f8de5523"
+  },
+  {
+    "consts": [],
+    "flags": [],
+    "methods": [
+      {
+        "flags": [],
+        "name": "registerTabUnloader",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsITabUnloader",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "onUnloadAttemptCompleted",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_UINT32"
+            }
+          }
+        ]
+      }
+    ],
+    "name": "nsIAvailableMemoryWatcherBase",
+    "parent": "nsISupports",
+    "uuid": "b0b5701e-239d-49db-9009-37e89f86441c"
+  },
+  {
+    "consts": [],
+    "flags": [
+      "function"
+    ],
+    "methods": [
+      {
+        "flags": [],
+        "name": "observe",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsIConsoleMessage",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      }
+    ],
+    "name": "nsIConsoleListener",
+    "parent": "nsISupports",
+    "uuid": "35c400a4-5792-438c-b915-65e30d58d557"
+  },
+  {
+    "consts": [
+      {
+        "name": "debug",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 0
+      },
+      {
+        "name": "info",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 1
+      },
+      {
+        "name": "warn",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 2
+      },
+      {
+        "name": "error",
+        "type": {
+          "tag": "TD_UINT32"
+        },
+        "value": 3
+      }
+    ],
+    "flags": [],
+    "methods": [
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "logLevel",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_UINT32"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "timeStamp",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "microSecondTimeStamp",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "message",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_ASTRING"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "isForwardedFromContentProcess",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "setter"
+        ],
+        "name": "isForwardedFromContentProcess",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hasretval"
+        ],
+        "name": "toString",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_UTF8STRING"
+            }
+          }
+        ]
+      }
+    ],
+    "name": "nsIConsoleMessage",
+    "parent": "nsISupports",
+    "uuid": "3aba9617-10e2-4839-83ae-2e6fc4df428b"
+  },
+  {
+    "consts": [
+      {
+        "name": "SuppressLog",
+        "type": {
+          "tag": "TD_UINT8"
+        },
+        "value": 0
+      },
+      {
+        "name": "OutputToLog",
+        "type": {
+          "tag": "TD_UINT8"
+        },
+        "value": 1
+      }
+    ],
+    "flags": [
+      "builtinclass"
+    ],
+    "methods": [
+      {
+        "flags": [],
+        "name": "logMessage",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsIConsoleMessage",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "logMessageWithMode",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsIConsoleMessage",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_UINT8"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "logStringMessage",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_PWSTRING"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hasretval"
+        ],
+        "name": "getMessageArray",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "element": {
+                "name": "nsIConsoleMessage",
+                "tag": "TD_INTERFACE_TYPE"
+              },
+              "tag": "TD_ARRAY"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "registerListener",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsIConsoleListener",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "unregisterListener",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsIConsoleListener",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "reset",
+        "params": []
+      },
+      {
+        "flags": [],
+        "name": "resetWindow",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_UINT64"
+            }
+          }
+        ]
+      }
+    ],
+    "name": "nsIConsoleService",
+    "parent": "nsISupports",
+    "uuid": "0eb81d20-c37e-42d4-82a8-ca9ae96bdf52"
+  },
+  {
+    "consts": [],
+    "flags": [],
+    "methods": [
+      {
+        "flags": [],
+        "name": "noteRefCountedObject",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_CSTRING"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
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+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "heapAllocated",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "heapOverheadFraction",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "JSMainRuntimeGCHeap",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "JSMainRuntimeTemporaryPeak",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "JSMainRuntimeCompartmentsSystem",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "JSMainRuntimeCompartmentsUser",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "JSMainRuntimeRealmsSystem",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "JSMainRuntimeRealmsUser",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "imagesContentUsedUncompressed",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "storageSQLite",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "lowMemoryEventsPhysical",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "ghostWindows",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "pageFaultsHard",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "hasMozMallocUsableSize",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "isDMDEnabled",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "getter",
+          "hasretval"
+        ],
+        "name": "isDMDRunning",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_BOOL"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "minimizeMemoryUsage",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsIRunnable",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [],
+        "name": "sizeOfTab",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "mozIDOMWindowProxy",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT64"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_DOUBLE"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_DOUBLE"
+            }
+          }
+        ]
+      }
+    ],
+    "name": "nsIMemoryReporterManager",
+    "parent": "nsISupports",
+    "uuid": "2998574d-8993-407a-b1a5-8ad7417653e1"
+  },
+  {
+    "consts": [],
+    "flags": [],
+    "methods": [
+      {
+        "flags": [],
+        "name": "postIdleTask",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "name": "nsIRunnable",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_UINT32"
+            }
+          }
+        ]
+      }
+    ],
+    "name": "nsIMessageLoop",
+    "parent": "nsISupports",
+    "uuid": "3e8c58e8-e52c-43e0-8e66-669ca788ff5f"
+  },
+  {
+    "consts": [],
+    "flags": [],
+    "methods": [
+      {
+        "flags": [
+          "hasretval"
+        ],
+        "name": "QueryInterface",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_NSID"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "iid_is": 0,
+              "tag": "TD_INTERFACE_IS_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "AddRef",
+        "params": []
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "Release",
+        "params": []
+      }
+    ],
+    "name": "nsISupports",
+    "parent": null,
+    "uuid": "00000000-0000-0000-c000-000000000046"
+  },
+  {
+    "consts": [],
+    "flags": [],
+    "methods": [
+      {
+        "flags": [
+          "hasretval"
+        ],
+        "name": "generateUUID",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_NSIDPTR"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "generateUUIDInPlace",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_VOID"
+            }
+          }
+        ]
+      }
+    ],
+    "name": "nsIUUIDGenerator",
+    "parent": "nsISupports",
+    "uuid": "138ad1b2-c694-41cc-b201-333ce936d8b8"
+  },
+  {
+    "consts": [],
+    "flags": [],
+    "methods": [
+      {
+        "flags": [
+          "hasretval"
+        ],
+        "name": "compare",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_CSTRING"
+            }
+          },
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_CSTRING"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "tag": "TD_INT32"
+            }
+          }
+        ]
+      }
+    ],
+    "name": "nsIVersionComparator",
+    "parent": "nsISupports",
+    "uuid": "e6cd620a-edbb-41d2-9e42-9a2ffc8107f3"
+  },
+  {
+    "consts": [],
+    "flags": [
+      "builtinclass"
+    ],
+    "methods": [
+      {
+        "flags": [
+          "hasretval"
+        ],
+        "name": "QueryReferent",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_NSID"
+            }
+          },
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "iid_is": 0,
+              "tag": "TD_INTERFACE_IS_TYPE"
+            }
+          }
+        ]
+      },
+      {
+        "flags": [
+          "hidden"
+        ],
+        "name": "sizeOfOnlyThis",
+        "params": [
+          {
+            "flags": [
+              "in"
+            ],
+            "type": {
+              "tag": "TD_VOID"
+            }
+          }
+        ]
+      }
+    ],
+    "name": "nsIWeakReference",
+    "parent": "nsISupports",
+    "uuid": "9188bc85-f92e-11d2-81ef-0060083a0bcf"
+  },
+  {
+    "consts": [],
+    "flags": [],
+    "methods": [
+      {
+        "flags": [
+          "hasretval"
+        ],
+        "name": "GetWeakReference",
+        "params": [
+          {
+            "flags": [
+              "out"
+            ],
+            "type": {
+              "name": "nsIWeakReference",
+              "tag": "TD_INTERFACE_TYPE"
+            }
+          }
+        ]
+      }
+    ],
+    "name": "nsISupportsWeakReference",
+    "parent": "nsISupports",
+    "uuid": "9188bc86-f92e-11d2-81ef-0060083a0bcf"
+  }
+]
\ No newline at end of file
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/update.sh b/tools/lint/eslint/eslint-plugin-mozilla/update.sh
new file mode 100755
index 0000000000..238e7695b1
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/update.sh
@@ -0,0 +1,61 @@
+#!/bin/sh
+# Script to regenerate the npm packages used for eslint-plugin-mozilla by the builders.
+# Requires
+
+# Force the scripts working directory to be projdir/tools/lint/eslint/eslint-plugin-mozilla.
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+cd $DIR
+
+echo "To complete this script you will need the following tokens from https://mozilla-releng.net/tokens"
+echo " - tooltool.upload.public"
+echo " - tooltool.download.public"
+echo ""
+read -p "Are these tokens visible at the above URL (y/n)?" choice
+case "$choice" in
+  y|Y )
+    echo ""
+    echo "1. Go to https://mozilla-releng.net"
+    echo "2. Log in using your Mozilla LDAP account."
+    echo "3. Click on \"Tokens.\""
+    echo "4. Issue a user token with the permissions tooltool.upload.public and tooltool.download.public."
+    echo ""
+    echo "When you click issue you will be presented with a long string. Paste the string into a temporary file called ~/.tooltool-token."
+    echo ""
+    read -rsp $'Press any key to continue...\n' -n 1
+    ;;
+  n|N )
+    echo ""
+    echo "You will need to contact somebody that has these permissions... people most likely to have these permissions are members of the releng, ateam, a sheriff, mratcliffe, or jryans"
+    exit 1
+    ;;
+  * )
+    echo ""
+  echo "Invalid input."
+  continue
+    ;;
+esac
+
+echo ""
+echo "Removing node_modules and package-lock.json..."
+# Move to the top-level directory.
+rm -rf node_modules
+rm package-lock.json
+
+echo "Installing modules for eslint-plugin-mozilla..."
+../../../../mach npm install
+
+echo "Creating eslint-plugin-mozilla.tar.gz..."
+tar cvz -f eslint-plugin-mozilla.tar.gz node_modules
+
+echo "Adding eslint-plugin-mozilla.tar.gz to tooltool..."
+rm -f manifest.tt
+../../../../python/mozbuild/mozbuild/action/tooltool.py add --visibility public --unpack eslint-plugin-mozilla.tar.gz --url="https://tooltool.mozilla-releng.net/"
+
+echo "Uploading eslint-plugin-mozilla.tar.gz to tooltool..."
+../../../../python/mozbuild/mozbuild/action/tooltool.py upload --authentication-file=~/.tooltool-token --message "node_modules folder update for tools/lint/eslint/eslint-plugin-mozilla" --url="https://tooltool.mozilla-releng.net/"
+
+echo "Cleaning up..."
+rm eslint-plugin-mozilla.tar.gz
+
+echo ""
+echo "Update complete, please commit and check in your changes."
diff --git a/tools/lint/eslint/eslint-plugin-spidermonkey-js/LICENSE b/tools/lint/eslint/eslint-plugin-spidermonkey-js/LICENSE
new file mode 100644
index 0000000000..e87a115e46
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-spidermonkey-js/LICENSE
@@ -0,0 +1,363 @@
+Mozilla Public License, version 2.0
+
+1. Definitions
+
+1.1. "Contributor"
+
+     means each individual or legal entity that creates, contributes to the
+     creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+
+     means the combination of the Contributions of others (if any) used by a
+     Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+
+     means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+
+     means Source Code Form to which the initial Contributor has attached the
+     notice in Exhibit A, the Executable Form of such Source Code Form, and
+     Modifications of such Source Code Form, in each case including portions
+     thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+     means
+
+     a. that the initial Contributor has attached the notice described in
+        Exhibit B to the Covered Software; or
+
+     b. that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the terms of
+        a Secondary License.
+
+1.6. "Executable Form"
+
+     means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+
+     means a work that combines Covered Software with other material, in a
+     separate file or files, that is not Covered Software.
+
+1.8. "License"
+
+     means this document.
+
+1.9. "Licensable"
+
+     means having the right to grant, to the maximum extent possible, whether
+     at the time of the initial grant or subsequently, any and all of the
+     rights conveyed by this License.
+
+1.10. "Modifications"
+
+     means any of the following:
+
+     a. any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered Software; or
+
+     b. any new file in Source Code Form that contains any Covered Software.
+
+1.11. "Patent Claims" of a Contributor
+
+      means any patent claim(s), including without limitation, method,
+      process, and apparatus claims, in any patent Licensable by such
+      Contributor that would be infringed, but for the grant of the License,
+      by the making, using, selling, offering for sale, having made, import,
+      or transfer of either its Contributions or its Contributor Version.
+
+1.12. "Secondary License"
+
+      means either the GNU General Public License, Version 2.0, the GNU Lesser
+      General Public License, Version 2.1, the GNU Affero General Public
+      License, Version 3.0, or any later versions of those licenses.
+
+1.13. "Source Code Form"
+
+      means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+
+      means an individual or a legal entity exercising rights under this
+      License. For legal entities, "You" includes any entity that controls, is
+      controlled by, or is under common control with You. For purposes of this
+      definition, "control" means (a) the power, direct or indirect, to cause
+      the direction or management of such entity, whether by contract or
+      otherwise, or (b) ownership of more than fifty percent (50%) of the
+      outstanding shares or beneficial ownership of such entity.
+
+
+2. License Grants and Conditions
+
+2.1. Grants
+
+     Each Contributor hereby grants You a world-wide, royalty-free,
+     non-exclusive license:
+
+     a. under intellectual property rights (other than patent or trademark)
+        Licensable by such Contributor to use, reproduce, make available,
+        modify, display, perform, distribute, and otherwise exploit its
+        Contributions, either on an unmodified basis, with Modifications, or
+        as part of a Larger Work; and
+
+     b. under Patent Claims of such Contributor to make, use, sell, offer for
+        sale, have made, import, and otherwise transfer either its
+        Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+     The licenses granted in Section 2.1 with respect to any Contribution
+     become effective for each Contribution on the date the Contributor first
+     distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+     The licenses granted in this Section 2 are the only rights granted under
+     this License. No additional rights or licenses will be implied from the
+     distribution or licensing of Covered Software under this License.
+     Notwithstanding Section 2.1(b) above, no patent license is granted by a
+     Contributor:
+
+     a. for any code that a Contributor has removed from Covered Software; or
+
+     b. for infringements caused by: (i) Your and any other third party's
+        modifications of Covered Software, or (ii) the combination of its
+        Contributions with other software (except as part of its Contributor
+        Version); or
+
+     c. under Patent Claims infringed by Covered Software in the absence of
+        its Contributions.
+
+     This License does not grant any rights in the trademarks, service marks,
+     or logos of any Contributor (except as may be necessary to comply with
+     the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+     No Contributor makes additional grants as a result of Your choice to
+     distribute the Covered Software under a subsequent version of this
+     License (see Section 10.2) or under the terms of a Secondary License (if
+     permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+     Each Contributor represents that the Contributor believes its
+     Contributions are its original creation(s) or it has sufficient rights to
+     grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+     This License is not intended to limit any rights You have under
+     applicable copyright doctrines of fair use, fair dealing, or other
+     equivalents.
+
+2.7. Conditions
+
+     Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
+     Section 2.1.
+
+
+3. Responsibilities
+
+3.1. Distribution of Source Form
+
+     All distribution of Covered Software in Source Code Form, including any
+     Modifications that You create or to which You contribute, must be under
+     the terms of this License. You must inform recipients that the Source
+     Code Form of the Covered Software is governed by the terms of this
+     License, and how they can obtain a copy of this License. You may not
+     attempt to alter or restrict the recipients' rights in the Source Code
+     Form.
+
+3.2. Distribution of Executable Form
+
+     If You distribute Covered Software in Executable Form then:
+
+     a. such Covered Software must also be made available in Source Code Form,
+        as described in Section 3.1, and You must inform recipients of the
+        Executable Form how they can obtain a copy of such Source Code Form by
+        reasonable means in a timely manner, at a charge no more than the cost
+        of distribution to the recipient; and
+
+     b. You may distribute such Executable Form under the terms of this
+        License, or sublicense it under different terms, provided that the
+        license for the Executable Form does not attempt to limit or alter the
+        recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+     You may create and distribute a Larger Work under terms of Your choice,
+     provided that You also comply with the requirements of this License for
+     the Covered Software. If the Larger Work is a combination of Covered
+     Software with a work governed by one or more Secondary Licenses, and the
+     Covered Software is not Incompatible With Secondary Licenses, this
+     License permits You to additionally distribute such Covered Software
+     under the terms of such Secondary License(s), so that the recipient of
+     the Larger Work may, at their option, further distribute the Covered
+     Software under the terms of either this License or such Secondary
+     License(s).
+
+3.4. Notices
+
+     You may not remove or alter the substance of any license notices
+     (including copyright notices, patent notices, disclaimers of warranty, or
+     limitations of liability) contained within the Source Code Form of the
+     Covered Software, except that You may alter any license notices to the
+     extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+     You may choose to offer, and to charge a fee for, warranty, support,
+     indemnity or liability obligations to one or more recipients of Covered
+     Software. However, You may do so only on Your own behalf, and not on
+     behalf of any Contributor. You must make it absolutely clear that any
+     such warranty, support, indemnity, or liability obligation is offered by
+     You alone, and You hereby agree to indemnify every Contributor for any
+     liability incurred by such Contributor as a result of warranty, support,
+     indemnity or liability terms You offer. You may include additional
+     disclaimers of warranty and limitations of liability specific to any
+     jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+
+   If it is impossible for You to comply with any of the terms of this License
+   with respect to some or all of the Covered Software due to statute,
+   judicial order, or regulation then You must: (a) comply with the terms of
+   this License to the maximum extent possible; and (b) describe the
+   limitations and the code they affect. Such description must be placed in a
+   text file included with all distributions of the Covered Software under
+   this License. Except to the extent prohibited by statute or regulation,
+   such description must be sufficiently detailed for a recipient of ordinary
+   skill to be able to understand it.
+
+5. Termination
+
+5.1. The rights granted under this License will terminate automatically if You
+     fail to comply with any of its terms. However, if You become compliant,
+     then the rights granted under this License from a particular Contributor
+     are reinstated (a) provisionally, unless and until such Contributor
+     explicitly and finally terminates Your grants, and (b) on an ongoing
+     basis, if such Contributor fails to notify You of the non-compliance by
+     some reasonable means prior to 60 days after You have come back into
+     compliance. Moreover, Your grants from a particular Contributor are
+     reinstated on an ongoing basis if such Contributor notifies You of the
+     non-compliance by some reasonable means, this is the first time You have
+     received notice of non-compliance with this License from such
+     Contributor, and You become compliant prior to 30 days after Your receipt
+     of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+     infringement claim (excluding declaratory judgment actions,
+     counter-claims, and cross-claims) alleging that a Contributor Version
+     directly or indirectly infringes any patent, then the rights granted to
+     You by any and all Contributors for the Covered Software under Section
+     2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
+     license agreements (excluding distributors and resellers) which have been
+     validly granted by You or Your distributors under this License prior to
+     termination shall survive termination.
+
+6. Disclaimer of Warranty
+
+   Covered Software is provided under this License on an "as is" basis,
+   without warranty of any kind, either expressed, implied, or statutory,
+   including, without limitation, warranties that the Covered Software is free
+   of defects, merchantable, fit for a particular purpose or non-infringing.
+   The entire risk as to the quality and performance of the Covered Software
+   is with You. Should any Covered Software prove defective in any respect,
+   You (not any Contributor) assume the cost of any necessary servicing,
+   repair, or correction. This disclaimer of warranty constitutes an essential
+   part of this License. No use of  any Covered Software is authorized under
+   this License except under this disclaimer.
+
+7. Limitation of Liability
+
+   Under no circumstances and under no legal theory, whether tort (including
+   negligence), contract, or otherwise, shall any Contributor, or anyone who
+   distributes Covered Software as permitted above, be liable to You for any
+   direct, indirect, special, incidental, or consequential damages of any
+   character including, without limitation, damages for lost profits, loss of
+   goodwill, work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses, even if such party shall have been
+   informed of the possibility of such damages. This limitation of liability
+   shall not apply to liability for death or personal injury resulting from
+   such party's negligence to the extent applicable law prohibits such
+   limitation. Some jurisdictions do not allow the exclusion or limitation of
+   incidental or consequential damages, so this exclusion and limitation may
+   not apply to You.
+
+8. Litigation
+
+   Any litigation relating to this License may be brought only in the courts
+   of a jurisdiction where the defendant maintains its principal place of
+   business and such litigation shall be governed by laws of that
+   jurisdiction, without reference to its conflict-of-law provisions. Nothing
+   in this Section shall prevent a party's ability to bring cross-claims or
+   counter-claims.
+
+9. Miscellaneous
+
+   This License represents the complete agreement concerning the subject
+   matter hereof. If any provision of this License is held to be
+   unenforceable, such provision shall be reformed only to the extent
+   necessary to make it enforceable. Any law or regulation which provides that
+   the language of a contract shall be construed against the drafter shall not
+   be used to construe this License against a Contributor.
+
+
+10. Versions of the License
+
+10.1. New Versions
+
+      Mozilla Foundation is the license steward. Except as provided in Section
+      10.3, no one other than the license steward has the right to modify or
+      publish new versions of this License. Each version will be given a
+      distinguishing version number.
+
+10.2. Effect of New Versions
+
+      You may distribute the Covered Software under the terms of the version
+      of the License under which You originally received the Covered Software,
+      or under the terms of any subsequent version published by the license
+      steward.
+
+10.3. Modified Versions
+
+      If you create software not governed by this License, and you want to
+      create a new license for such software, you may create and use a
+      modified version of this License if you rename the license and remove
+      any references to the name of the license steward (except to note that
+      such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+      Licenses If You choose to distribute Source Code Form that is
+      Incompatible With Secondary Licenses under the terms of this version of
+      the License, the notice described in Exhibit B of this License must be
+      attached.
+
+Exhibit A - Source Code Form License Notice
+
+      This Source Code Form is subject to the
+      terms of the Mozilla Public License, v.
+      2.0. If a copy of the MPL was not
+      distributed with this file, You can
+      obtain one at
+      http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular file,
+then You may include the notice in a location (such as a LICENSE file in a
+relevant directory) where a recipient would be likely to look for such a
+notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+
+      This Source Code Form is "Incompatible
+      With Secondary Licenses", as defined by
+      the Mozilla Public License, v. 2.0.
+
diff --git a/tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/environments/self-hosted.js b/tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/environments/self-hosted.js
new file mode 100644
index 0000000000..37ae42bfa3
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/environments/self-hosted.js
@@ -0,0 +1,180 @@
+/**
+ * @fileoverview Add environment defaults to SpiderMonkey's self-hosted JS.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const path = require("path");
+const fs = require("fs");
+
+let gRootDir = null;
+
+// Copied from `tools/lint/eslint/eslint-plugin-mozilla/lib/helpers.js`.
+function getRootDir() {
+  if (!gRootDir) {
+    function searchUpForIgnore(dirName, filename) {
+      let parsed = path.parse(dirName);
+      while (parsed.root !== dirName) {
+        if (fs.existsSync(path.join(dirName, filename))) {
+          return dirName;
+        }
+        // Move up a level
+        dirName = parsed.dir;
+        parsed = path.parse(dirName);
+      }
+      return null;
+    }
+
+    let possibleRoot = searchUpForIgnore(
+      path.dirname(module.filename),
+      ".eslintignore"
+    );
+    if (!possibleRoot) {
+      possibleRoot = searchUpForIgnore(path.resolve(), ".eslintignore");
+    }
+    if (!possibleRoot) {
+      possibleRoot = searchUpForIgnore(path.resolve(), "package.json");
+    }
+    if (!possibleRoot) {
+      // We've couldn't find a root from the module or CWD, so lets just go
+      // for the CWD. We really don't want to throw if possible, as that
+      // tends to give confusing results when used with ESLint.
+      possibleRoot = process.cwd();
+    }
+
+    gRootDir = possibleRoot;
+  }
+
+  return gRootDir;
+}
+
+function tryReadFile(filePath) {
+  let absPath = path.join(getRootDir(), filePath);
+  if (!fs.existsSync(absPath)) {
+    // Safely handle the case when the file wasn't found, because throwing
+    // errors can lead to confusing result when used with ESLint.
+    return "";
+  }
+  return fs.readFileSync(absPath, "utf-8");
+}
+
+// Search for top-level declarations, #defines, and #includes.
+function addGlobalsFrom(dirName, fileName, globals) {
+  let filePath = path.join(dirName, fileName);
+
+  // Definitions are separated by line.
+  let lines = tryReadFile(filePath).split("\n");
+
+  // We don't have to fully parse the source code, because it's formatted
+  // through "prettier", which means we know the exact code structure.
+  //
+  // |class| is disallowed in self-hosted code, so we don't have to handle it.
+  for (let line of lines) {
+    if (
+      line.startsWith("function") ||
+      line.startsWith("function*") ||
+      line.startsWith("async function") ||
+      line.startsWith("async function*")
+    ) {
+      let m = line.match(/^(?:async )?function(?:\*)?\s+([\w\$]+)\s*\(/);
+      if (m) {
+        globals[m[1]] = "readonly";
+      }
+    } else if (
+      line.startsWith("var") ||
+      line.startsWith("let") ||
+      line.startsWith("const")
+    ) {
+      let m = line.match(/^(?:var|let|const)\s+([\w\$]+)\s*[;=]/);
+      if (m) {
+        globals[m[1]] = "readonly";
+      }
+    } else if (line.startsWith("#define")) {
+      let m = line.match(/^#define (\w+)/);
+      if (m) {
+        globals[m[1]] = "readonly";
+      }
+    } else if (line.startsWith("#include")) {
+      let m = line.match(/^#include \"([\w\.]+)\"$/);
+      if (m) {
+        // Also process definitions from includes.
+        addGlobalsFrom(dirName, m[1], globals);
+      }
+    }
+  }
+}
+
+function selfHostingDefines(dirName = "js/src/builtin/") {
+  let absDir = path.join(getRootDir(), dirName);
+  if (!fs.existsSync(absDir)) {
+    // See |tryReadFile| for why we avoid to throw any errors.
+    return {};
+  }
+
+  // Search sub-directories and js-files within |dirName|.
+  let dirs = [];
+  let jsFiles = [];
+  for (let name of fs.readdirSync(absDir)) {
+    let stat = fs.statSync(path.join(absDir, name));
+    if (stat.isDirectory()) {
+      dirs.push(name);
+    } else if (stat.isFile() && name.endsWith(".js")) {
+      jsFiles.push(name);
+    }
+  }
+
+  let globals = Object.create(null);
+
+  // Process each js-file.
+  for (let jsFile of jsFiles) {
+    addGlobalsFrom(dirName, jsFile, globals);
+  }
+
+  // Recursively traverse all sub-directories.
+  for (let dir of dirs) {
+    globals = { ...globals, ...selfHostingDefines(path.join(dirName, dir)) };
+  }
+
+  return globals;
+}
+
+function selfHostingFunctions() {
+  // Definitions can be spread across multiple lines and may have extra
+  // whitespace, so we simply remove all whitespace and match over the complete
+  // file.
+  let content = tryReadFile("js/src/vm/SelfHosting.cpp").replace(/\s+/g, "");
+
+  let globals = Object.create(null);
+  for (let m of content.matchAll(/(?:JS_FN|JS_INLINABLE_FN)\("(\w+)"/g)) {
+    globals[m[1]] = "readonly";
+  }
+  return globals;
+}
+
+function errorNumbers() {
+  // Definitions are separated by line.
+  let lines = tryReadFile("js/public/friend/ErrorNumbers.msg").split("\n");
+
+  let globals = Object.create(null);
+  for (let line of lines) {
+    let m = line.match(/^MSG_DEF\((\w+),/);
+    if (m) {
+      globals[m[1]] = "readonly";
+    }
+  }
+  return globals;
+}
+
+const globals = {
+  ...selfHostingDefines(),
+  ...selfHostingFunctions(),
+  ...errorNumbers(),
+};
+
+module.exports = {
+  globals,
+};
diff --git a/tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/index.js b/tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/index.js
new file mode 100644
index 0000000000..d9d40af8c6
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/index.js
@@ -0,0 +1,20 @@
+/**
+ * @fileoverview A processor to help parse the spidermonkey js code.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Plugin Definition
+// ------------------------------------------------------------------------------
+module.exports = {
+  processors: {
+    processor: require("../lib/processors/self-hosted"),
+  },
+  environments: {
+    environment: require("../lib/environments/self-hosted"),
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/processors/self-hosted.js b/tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/processors/self-hosted.js
new file mode 100644
index 0000000000..8a607ffbe5
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/processors/self-hosted.js
@@ -0,0 +1,128 @@
+/**
+ * @fileoverview Remove macros from SpiderMonkey's self-hosted JS.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const path = require("path");
+const fs = require("fs");
+
+const selfHostedRegex = /js\/src\/builtin\/.*?\.js$/;
+const macroRegex = /\s*\#(if|ifdef|else|elif|endif|include|define|undef).*/;
+
+function isSelfHostedFile(filename) {
+  if (path.win32) {
+    filename = filename.split(path.sep).join("/");
+  }
+  return selfHostedRegex.test(filename);
+}
+
+function tryReadFile(filePath) {
+  if (!path.isAbsolute(filePath)) {
+    return "";
+  }
+  if (!fs.existsSync(filePath)) {
+    // Safely handle the case when the file wasn't found, because throwing
+    // errors can lead to confusing result when used with ESLint.
+    return "";
+  }
+  return fs.readFileSync(filePath, "utf-8");
+}
+
+// Adjust the range of fixes to match the original source code.
+function createFix(lines, message) {
+  let { line, column, fix } = message;
+
+  // Line and column are 1-based. Make sure we got a valid input.
+  if (line <= 0 || column <= 0) {
+    return null;
+  }
+
+  // Reject to create a fix when the line is out of range for some reason.
+  if (line > lines.length) {
+    return null;
+  }
+
+  // Find the absolute start position of the line in the original file.
+  let startOfLine = 0;
+  for (let i = 0; i < line - 1; ++i) {
+    // Add the length of the line, including its line separator.
+    startOfLine += lines[i].length + "\n".length;
+  }
+
+  // Add the 1-based column to the start of line to get the start position.
+  let start = startOfLine + (column - 1);
+
+  // Add the fix range to get the end position.
+  let end = start + (fix.range[1] - fix.range[0]);
+
+  // And finally return the new fix object.
+  return { text: fix.text, range: [start, end] };
+}
+
+module.exports = {
+  preprocess(text, filename) {
+    if (!isSelfHostedFile(filename)) {
+      return [text];
+    }
+
+    let lines = text.split(/\n/);
+    for (let i = 0; i < lines.length; i++) {
+      if (!macroRegex.test(lines[i])) {
+        // No macro here, nothing to do.
+        continue;
+      }
+
+      for (; i < lines.length; i++) {
+        // The macro isn't correctly indented, so we need to instruct
+        // prettier to ignore them.
+        lines[i] = "// prettier-ignore -- " + lines[i];
+
+        // If the line ends with a backslash (\), the next line
+        // is also part of part of the macro.
+        if (!lines[i].endsWith("\\")) {
+          break;
+        }
+      }
+    }
+
+    return [lines.join("\n")];
+  },
+
+  postprocess(messages, filename) {
+    // Don't attempt to create fixes for any non-selfhosted files.
+    if (!isSelfHostedFile(filename)) {
+      return [].concat(...messages);
+    }
+
+    let lines = null;
+
+    let result = [];
+    for (let message of messages.flat()) {
+      if (message.fix) {
+        if (lines === null) {
+          lines = tryReadFile(filename).split(/\n/);
+        }
+
+        let fix = createFix(lines, message);
+        if (fix) {
+          message.fix = fix;
+        } else {
+          // We couldn't create a fix, so we better remove the passed in fix,
+          // because its range points to the preprocessor output, but the post-
+          // processor must translate it into a range of the original source.
+          delete message.fix;
+        }
+      }
+
+      result.push(message);
+    }
+    return result;
+  },
+
+  supportsAutofix: true,
+};
diff --git a/tools/lint/eslint/eslint-plugin-spidermonkey-js/package.json b/tools/lint/eslint/eslint-plugin-spidermonkey-js/package.json
new file mode 100644
index 0000000000..7d96b5b1c4
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-spidermonkey-js/package.json
@@ -0,0 +1,28 @@
+{
+  "name": "eslint-plugin-spidermonkey-js",
+  "version": "0.1.1",
+  "description": "A collection of rules that help enforce JavaScript coding standard in the Mozilla SpiderMonkey project.",
+  "keywords": [
+    "eslint",
+    "eslintplugin",
+    "eslint-plugin",
+    "mozilla",
+    "spidermonkey"
+  ],
+  "bugs": {
+    "url": "https://bugzilla.mozilla.org/enter_bug.cgi?product=Testing&component=Lint"
+  },
+  "homepage": "http://firefox-source-docs.mozilla.org/tools/lint/linters/eslint-plugin-spidermonkey-js.html",
+  "repository": {
+    "type": "hg",
+    "url": "https://hg.mozilla.org/mozilla-central/"
+  },
+  "author": "Mozilla",
+  "main": "lib/index.js",
+  "dependencies": {},
+  "devDependencies": {},
+  "engines": {
+    "node": ">=6.9.1"
+  },
+  "license": "MPL-2.0"
+}
diff --git a/tools/lint/eslint/manifest.tt b/tools/lint/eslint/manifest.tt
new file mode 100644
index 0000000000..aa6498aeff
--- /dev/null
+++ b/tools/lint/eslint/manifest.tt
@@ -0,0 +1,10 @@
+[
+  {
+    "filename": "eslint.tar.gz",
+    "size": 26456449,
+    "algorithm": "sha512",
+    "digest": "8c266196d7d694df67ee7f654b2d905d00c7c40d989462c6e78a82a69a83160e5f34da3d353f95309c42ad057251e5888c814a3d8d9d97db1827909e393cbb58",
+    "unpack": true,
+    "visibility": "public"
+  }
+]
\ No newline at end of file
diff --git a/tools/lint/eslint/setup_helper.py b/tools/lint/eslint/setup_helper.py
new file mode 100644
index 0000000000..3bb10758cf
--- /dev/null
+++ b/tools/lint/eslint/setup_helper.py
@@ -0,0 +1,432 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import os
+import platform
+import re
+import subprocess
+import sys
+from filecmp import dircmp
+
+from mozbuild.nodeutil import (
+    NODE_MIN_VERSION,
+    NPM_MIN_VERSION,
+    find_node_executable,
+    find_npm_executable,
+)
+from mozfile.mozfile import remove as mozfileremove
+from packaging.version import Version
+
+NODE_MACHING_VERSION_NOT_FOUND_MESSAGE = """
+Could not find Node.js executable later than %s.
+
+Executing `mach bootstrap --no-system-changes` should
+install a compatible version in ~/.mozbuild on most platforms.
+""".strip()
+
+NPM_MACHING_VERSION_NOT_FOUND_MESSAGE = """
+Could not find npm executable later than %s.
+
+Executing `mach bootstrap --no-system-changes` should
+install a compatible version in ~/.mozbuild on most platforms.
+""".strip()
+
+NODE_NOT_FOUND_MESSAGE = """
+nodejs is either not installed or is installed to a non-standard path.
+
+Executing `mach bootstrap --no-system-changes` should
+install a compatible version in ~/.mozbuild on most platforms.
+""".strip()
+
+NPM_NOT_FOUND_MESSAGE = """
+Node Package Manager (npm) is either not installed or installed to a
+non-standard path.
+
+Executing `mach bootstrap --no-system-changes` should
+install a compatible version in ~/.mozbuild on most platforms.
+""".strip()
+
+
+VERSION_RE = re.compile(r"^\d+\.\d+\.\d+$")
+CARET_VERSION_RANGE_RE = re.compile(r"^\^((\d+)\.\d+\.\d+)$")
+
+project_root = None
+
+
+def eslint_maybe_setup():
+    """Setup ESLint only if it is needed."""
+    has_issues, needs_clobber = eslint_module_needs_setup()
+
+    if has_issues:
+        eslint_setup(needs_clobber)
+
+
+def eslint_setup(should_clobber=False):
+    """Ensure eslint is optimally configured.
+
+    This command will inspect your eslint configuration and
+    guide you through an interactive wizard helping you configure
+    eslint for optimal use on Mozilla projects.
+    """
+    package_setup(get_project_root(), "eslint", should_clobber=should_clobber)
+
+
+def remove_directory(path):
+    print("Clobbering %s..." % path)
+    if sys.platform.startswith("win") and have_winrm():
+        process = subprocess.Popen(["winrm", "-rf", path])
+        process.wait()
+    else:
+        mozfileremove(path)
+
+
+def package_setup(
+    package_root,
+    package_name,
+    should_update=False,
+    should_clobber=False,
+    no_optional=False,
+):
+    """Ensure `package_name` at `package_root` is installed.
+
+    When `should_update` is true, clobber, install, and produce a new
+    "package-lock.json" file.
+
+    This populates `package_root/node_modules`.
+
+    """
+    orig_project_root = get_project_root()
+    orig_cwd = os.getcwd()
+
+    if should_update:
+        should_clobber = True
+
+    try:
+        set_project_root(package_root)
+        sys.path.append(os.path.dirname(__file__))
+
+        # npm sometimes fails to respect cwd when it is run using check_call so
+        # we manually switch folders here instead.
+        project_root = get_project_root()
+        os.chdir(project_root)
+
+        if should_clobber:
+            remove_directory(os.path.join(project_root, "node_modules"))
+
+        # Always remove the eslint-plugin-mozilla sub-directory as that can
+        # sometimes conflict with the top level node_modules, see bug 1809036.
+        remove_directory(
+            os.path.join(
+                get_eslint_module_path(), "eslint-plugin-mozilla", "node_modules"
+            )
+        )
+
+        npm_path, _ = find_npm_executable()
+        if not npm_path:
+            return 1
+
+        node_path, _ = find_node_executable()
+        if not node_path:
+            return 1
+
+        extra_parameters = ["--loglevel=error"]
+
+        if no_optional:
+            extra_parameters.append("--no-optional")
+
+        package_lock_json_path = os.path.join(get_project_root(), "package-lock.json")
+
+        if should_update:
+            cmd = [npm_path, "install"]
+            mozfileremove(package_lock_json_path)
+        else:
+            cmd = [npm_path, "ci"]
+
+        # On non-Windows, ensure npm is called via node, as node may not be in the
+        # path.
+        if platform.system() != "Windows":
+            cmd.insert(0, node_path)
+
+        cmd.extend(extra_parameters)
+
+        # Ensure that bare `node` and `npm` in scripts, including post-install scripts, finds the
+        # binary we're invoking with.  Without this, it's easy for compiled extensions to get
+        # mismatched versions of the Node.js extension API.
+        path = os.environ.get("PATH", "").split(os.pathsep)
+        node_dir = os.path.dirname(node_path)
+        if node_dir not in path:
+            path = [node_dir] + path
+
+        print('Installing %s for mach using "%s"...' % (package_name, " ".join(cmd)))
+        result = call_process(
+            package_name, cmd, append_env={"PATH": os.pathsep.join(path)}
+        )
+
+        if not result:
+            return 1
+
+        bin_path = os.path.join(
+            get_project_root(), "node_modules", ".bin", package_name
+        )
+
+        print("\n%s installed successfully!" % package_name)
+        print("\nNOTE: Your local %s binary is at %s\n" % (package_name, bin_path))
+
+    finally:
+        set_project_root(orig_project_root)
+        os.chdir(orig_cwd)
+
+
+def call_process(name, cmd, cwd=None, append_env={}):
+    env = dict(os.environ)
+    env.update(append_env)
+
+    try:
+        with open(os.devnull, "w") as fnull:
+            subprocess.check_call(cmd, cwd=cwd, stdout=fnull, env=env)
+    except subprocess.CalledProcessError:
+        if cwd:
+            print("\nError installing %s in the %s folder, aborting." % (name, cwd))
+        else:
+            print("\nError installing %s, aborting." % name)
+
+        return False
+
+    return True
+
+
+def expected_eslint_modules():
+    # Read the expected version of ESLint and external modules
+    expected_modules_path = os.path.join(get_project_root(), "package.json")
+    with open(expected_modules_path, "r", encoding="utf-8") as f:
+        sections = json.load(f)
+        expected_modules = sections.get("dependencies", {})
+        expected_modules.update(sections.get("devDependencies", {}))
+
+    # Also read the in-tree ESLint plugin mozilla information, to ensure the
+    # dependencies are up to date.
+    # Bug 1766659: This is disabled for now due to sub-dependencies at the top
+    # level providing different module versions to those in eslint-plugin-mozilla.
+    # mozilla_json_path = os.path.join(
+    #     get_eslint_module_path(), "eslint-plugin-mozilla", "package.json"
+    # )
+    # with open(mozilla_json_path, "r", encoding="utf-8") as f:
+    #     expected_modules.update(json.load(f).get("dependencies", {}))
+
+    # Also read the in-tree ESLint plugin spidermonkey information, to ensure the
+    # dependencies are up to date.
+    mozilla_json_path = os.path.join(
+        get_eslint_module_path(), "eslint-plugin-spidermonkey-js", "package.json"
+    )
+    with open(mozilla_json_path, "r", encoding="utf-8") as f:
+        expected_modules.update(json.load(f).get("dependencies", {}))
+
+    return expected_modules
+
+
+def check_eslint_files(node_modules_path, name):
+    def check_file_diffs(dcmp):
+        # Diff files only looks at files that are different. Not for files
+        # that are only present on one side. This should be generally OK as
+        # new files will need to be added in the index.js for the package.
+        if dcmp.diff_files and dcmp.diff_files != ["package.json"]:
+            return True
+
+        result = False
+
+        # Again, we only look at common sub directories for the same reason
+        # as above.
+        for sub_dcmp in dcmp.subdirs.values():
+            result = result or check_file_diffs(sub_dcmp)
+
+        return result
+
+    dcmp = dircmp(
+        os.path.join(node_modules_path, name),
+        os.path.join(get_eslint_module_path(), name),
+    )
+
+    return check_file_diffs(dcmp)
+
+
+def eslint_module_needs_setup():
+    has_issues = False
+    needs_clobber = False
+    node_modules_path = os.path.join(get_project_root(), "node_modules")
+
+    for name, expected_data in expected_eslint_modules().items():
+        # expected_eslint_modules returns a string for the version number of
+        # dependencies for installation of eslint generally, and an object
+        # for our in-tree plugins (which contains the entire module info).
+        if "version" in expected_data:
+            version_range = expected_data["version"]
+        else:
+            version_range = expected_data
+
+        path = os.path.join(node_modules_path, name, "package.json")
+
+        if not os.path.exists(path):
+            print("%s v%s needs to be installed locally." % (name, version_range))
+            has_issues = True
+            continue
+        data = json.load(open(path, encoding="utf-8"))
+
+        if version_range.startswith("file:"):
+            # We don't need to check local file installations for versions, as
+            # these are symlinked, so we'll always pick up the latest.
+            continue
+
+        if name == "eslint" and Version("4.0.0") > Version(data["version"]):
+            print("ESLint is an old version, clobbering node_modules directory")
+            needs_clobber = True
+            has_issues = True
+            continue
+
+        # For @microsoft/eslint-plugin-sdl we are loading a static version as
+        # long that PR is not merged into the master branch. Bug 1786290
+        if (name == "@microsoft/eslint-plugin-sdl") and (
+            version_range
+            == "github:mozfreddyb/eslint-plugin-sdl#17b22cd527682108af7a1a4edacf69cb7a9b4a06"
+        ):
+            continue
+
+        if not version_in_range(data["version"], version_range):
+            print("%s v%s should be v%s." % (name, data["version"], version_range))
+            has_issues = True
+            continue
+
+    return has_issues, needs_clobber
+
+
+def version_in_range(version, version_range):
+    """
+    Check if a module version is inside a version range.  Only supports explicit versions and
+    caret ranges for the moment, since that's all we've used so far.
+    """
+    if version == version_range:
+        return True
+
+    version_match = VERSION_RE.match(version)
+    if not version_match:
+        raise RuntimeError("mach eslint doesn't understand module version %s" % version)
+    version = Version(version)
+
+    # Caret ranges as specified by npm allow changes that do not modify the left-most non-zero
+    # digit in the [major, minor, patch] tuple.  The code below assumes the major digit is
+    # non-zero.
+    range_match = CARET_VERSION_RANGE_RE.match(version_range)
+    if range_match:
+        range_version = range_match.group(1)
+        range_major = int(range_match.group(2))
+
+        range_min = Version(range_version)
+        range_max = Version("%d.0.0" % (range_major + 1))
+
+        return range_min <= version < range_max
+
+    return False
+
+
+def get_possible_node_paths_win():
+    """
+    Return possible nodejs paths on Windows.
+    """
+    if platform.system() != "Windows":
+        return []
+
+    return list(
+        {
+            "%s\\nodejs" % os.environ.get("SystemDrive"),
+            os.path.join(os.environ.get("ProgramFiles"), "nodejs"),
+            os.path.join(os.environ.get("PROGRAMW6432"), "nodejs"),
+            os.path.join(os.environ.get("PROGRAMFILES"), "nodejs"),
+        }
+    )
+
+
+def get_version(path):
+    try:
+        version_str = subprocess.check_output(
+            [path, "--version"], stderr=subprocess.STDOUT, universal_newlines=True
+        )
+        return version_str
+    except (subprocess.CalledProcessError, OSError):
+        return None
+
+
+def set_project_root(root=None):
+    """Sets the project root to the supplied path, or works out what the root
+    is based on looking for 'mach'.
+
+    Keyword arguments:
+    root - (optional) The path to set the root to.
+    """
+    global project_root
+
+    if root:
+        project_root = root
+        return
+
+    file_found = False
+    folder = os.getcwd()
+
+    while folder:
+        if os.path.exists(os.path.join(folder, "mach")):
+            file_found = True
+            break
+        else:
+            folder = os.path.dirname(folder)
+
+    if file_found:
+        project_root = os.path.abspath(folder)
+
+
+def get_project_root():
+    """Returns the absolute path to the root of the project, see set_project_root()
+    for how this is determined.
+    """
+    global project_root
+
+    if not project_root:
+        set_project_root()
+
+    return project_root
+
+
+def get_eslint_module_path():
+    return os.path.join(get_project_root(), "tools", "lint", "eslint")
+
+
+def check_node_executables_valid():
+    node_path, version = find_node_executable()
+    if not node_path:
+        print(NODE_NOT_FOUND_MESSAGE)
+        return False
+    if not version:
+        print(NODE_MACHING_VERSION_NOT_FOUND_MESSAGE % NODE_MIN_VERSION)
+        return False
+
+    npm_path, version = find_npm_executable()
+    if not npm_path:
+        print(NPM_NOT_FOUND_MESSAGE)
+        return False
+    if not version:
+        print(NPM_MACHING_VERSION_NOT_FOUND_MESSAGE % NPM_MIN_VERSION)
+        return False
+
+    return True
+
+
+def have_winrm():
+    # `winrm -h` should print 'winrm version ...' and exit 1
+    try:
+        p = subprocess.Popen(
+            ["winrm.exe", "-h"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT
+        )
+        return p.wait() == 1 and p.stdout.read().startswith("winrm")
+    except Exception:
+        return False
diff --git a/tools/lint/eslint/update.sh b/tools/lint/eslint/update.sh
new file mode 100755
index 0000000000..e651170f5e
--- /dev/null
+++ b/tools/lint/eslint/update.sh
@@ -0,0 +1,71 @@
+#!/bin/sh
+# Script to regenerate the npm packages used for ESLint by the builders.
+# Requires
+
+# Force the scripts working directory to be projdir/tools/lint/eslint.
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+cd $DIR
+
+echo "To complete this script you will need the following tokens from https://mozilla-releng.net/tokens"
+echo " - tooltool.upload.public"
+echo " - tooltool.download.public"
+echo ""
+read -p "Are these tokens visible at the above URL (y/n)?" choice
+case "$choice" in
+  y|Y )
+    echo ""
+    echo "1. Go to https://mozilla-releng.net"
+    echo "2. Log in using your Mozilla LDAP account."
+    echo "3. Click on \"Tokens.\""
+    echo "4. Issue a user token with the permissions tooltool.upload.public and tooltool.download.public."
+    echo ""
+    echo "When you click issue you will be presented with a long string. Paste the string into a temporary file called ~/.tooltool-token."
+    echo ""
+    read -rsp $'Press any key to continue...\n' -n 1
+    ;;
+  n|N )
+    echo ""
+    echo "You will need to contact somebody that has these permissions... people most likely to have these permissions are members of the releng, ateam, a sheriff, mratcliffe, or jryans"
+    exit 1
+    ;;
+  * )
+    echo ""
+  echo "Invalid input."
+  continue
+    ;;
+esac
+
+echo ""
+echo "Removing node_modules and package-lock.json..."
+# Move to the top-level directory.
+cd ../../../
+rm -rf node_modules/
+rm -rf tools/lint/eslint/eslint-plugin-mozilla/node_modules
+rm package-lock.json
+
+echo "Installing eslint and external plugins..."
+# ESLint and all _external_ plugins are listed in this directory's package.json,
+# so a regular `npm install` will install them at the specified versions.
+# The in-tree eslint-plugin-mozilla is kept out of this tooltool archive on
+# purpose so that it can be changed by any developer without requiring tooltool
+# access to make changes.
+./mach npm install
+
+echo "Creating eslint.tar.gz..."
+tar cvz --exclude=eslint-plugin-mozilla --exclude=eslint-plugin-spidermonkey-js -f eslint.tar.gz node_modules
+
+echo "Adding eslint.tar.gz to tooltool..."
+rm tools/lint/eslint/manifest.tt
+./python/mozbuild/mozbuild/action/tooltool.py add --visibility public --unpack eslint.tar.gz
+
+echo "Uploading eslint.tar.gz to tooltool..."
+./python/mozbuild/mozbuild/action/tooltool.py upload --authentication-file=~/.tooltool-token --message "node_modules folder update for tools/lint/eslint"
+
+echo "Cleaning up..."
+mv manifest.tt tools/lint/eslint/manifest.tt
+rm eslint.tar.gz
+
+cd $DIR
+
+echo ""
+echo "Update complete, please commit and check in your changes."
diff --git a/tools/lint/file-perm.yml b/tools/lint/file-perm.yml
new file mode 100644
index 0000000000..805f6439ca
--- /dev/null
+++ b/tools/lint/file-perm.yml
@@ -0,0 +1,53 @@
+---
+file-perm:
+    description: File permission check
+    include:
+        - .
+    extensions:
+        - .build
+        - .c
+        - .cc
+        - .cpp
+        - .flac
+        - .h
+        - .html
+        - .idl
+        - .js
+        - .jsm
+        - .jsx
+        - .m
+        - .m4s
+        - .md
+        - .mjs
+        - .mm
+        - .mozbuild
+        - .mp4
+        - .png
+        - .rs
+        - .rst
+        - .svg
+        - .ttf
+        - .wasm
+        - .webidl
+        - .xhtml
+        - .xml
+        - .xul
+        - .yml
+    support-files:
+        - 'tools/lint/file-perm/**'
+    type: external
+    payload: file-perm:lint
+
+maybe-shebang-file-perm:
+    description: "File permission check for files that might have `#!` header."
+    include:
+        - .
+    allow-shebang: true
+    extensions:
+        - .js
+        - .py
+        - .sh
+    support-files:
+        - 'tools/lint/file-perm/**'
+    type: external
+    payload: file-perm:lint
diff --git a/tools/lint/file-perm/__init__.py b/tools/lint/file-perm/__init__.py
new file mode 100644
index 0000000000..c5f31c008c
--- /dev/null
+++ b/tools/lint/file-perm/__init__.py
@@ -0,0 +1,45 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import platform
+
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+
+def lint(paths, config, fix=None, **lintargs):
+    results = []
+    fixed = 0
+
+    if platform.system() == "Windows":
+        # Windows doesn't have permissions in files
+        # Exit now
+        return {"results": results, "fixed": fixed}
+
+    files = list(expand_exclusions(paths, config, lintargs["root"]))
+    for f in files:
+        if os.access(f, os.X_OK):
+            if config.get("allow-shebang"):
+                with open(f, "r+") as content:
+                    # Some source files have +x permissions
+                    line = content.readline()
+                    if line.startswith("#!"):
+                        # Check if the file doesn't start with a shebang
+                        # if it does, not a warning
+                        continue
+
+            if fix:
+                # We want to fix it, do it and leave
+                os.chmod(f, 0o644)
+                fixed += 1
+                continue
+
+            res = {
+                "path": f,
+                "message": "Execution permissions on a source file",
+                "level": "error",
+            }
+            results.append(result.from_config(config, **res))
+    return {"results": results, "fixed": fixed}
diff --git a/tools/lint/file-whitespace.yml b/tools/lint/file-whitespace.yml
new file mode 100644
index 0000000000..97fe39de07
--- /dev/null
+++ b/tools/lint/file-whitespace.yml
@@ -0,0 +1,160 @@
+---
+file-whitespace:
+    description: File content sanity check
+    include:
+        - .
+        - tools/lint/python/black_requirements.txt
+        - tools/lint/python/ruff_requirements.txt
+        - tools/lint/rst/requirements.txt
+        - tools/lint/tox/tox_requirements.txt
+        - tools/lint/spell/codespell_requirements.txt
+        - tools/tryselect/selectors/chooser/requirements.txt
+    exclude:
+        - accessible/tests/crashtests
+        - accessible/tests/mochitest
+        - browser/locales/en-US/chrome/browser/uiDensity.properties
+        - build/pgo/blueprint
+        - build/pgo/js-input
+        - devtools/client/debugger/test
+        - devtools/client/inspector/markup/test
+        - devtools/client/inspector/rules/test
+        - devtools/client/inspector/test
+        # Excluded because tests were failing unexpectedly
+        - devtools/client/styleeditor/test/sync_with_csp.css
+        - devtools/client/webconsole/test/browser/test-message-categories-css-parser.css
+        - devtools/shared/webconsole/test/chrome/test_object_actor_native_getters.html
+        - docshell/base/crashtests
+        - docshell/test
+        - dom/base/crashtests
+        - dom/base/test
+        - dom/canvas/crashtests
+        - dom/canvas/test
+        - dom/events/crashtests
+        - dom/events/test
+        - dom/file/tests/file_mozfiledataurl_inner.html
+        - dom/html/crashtests
+        - dom/html/reftests
+        - dom/html/test
+        - dom/jsurl/crashtests/344996-1.xhtml
+        - dom/jsurl/test
+        - dom/media/mediasource/test/crashtests/926665.html
+        - dom/media/test
+        - dom/media/tests
+        - dom/media/webaudio/test
+        - dom/media/webrtc/transport/nricectx.cpp
+        - dom/media/webspeech/synth/test
+        - dom/plugins/test
+        - dom/smil/crashtests
+        - dom/smil/test
+        - dom/security/test
+        - dom/svg/crashtests
+        - dom/svg/test
+        - dom/webauthn/winwebauthn/webauthn.h
+        - dom/tests/mochitest
+        - dom/xml/crashtests
+        - dom/xml/test
+        - dom/xslt/crashtests
+        - dom/xslt/tests
+        - dom/xul/crashtests
+        - dom/xul/test
+        - editor/composer/test
+        - editor/composer/crashtests/removing-editable-xslt.html
+        - editor/libeditor/tests
+        - editor/libeditor/crashtests
+        - editor/reftests
+        - extensions/universalchardet
+        - gfx/tests/crashtests
+        - gfx/vr/nsFxrCommandLineHandler.cpp
+        - image/test/crashtests
+        - image/test/mochitest
+        - image/test/reftest
+        - intl/lwbrk/crashtests
+        - intl/uconv/crashtests
+        - intl/uconv/tests
+        - intl/strres/tests/unit/397093.properties
+        - intl/strres/tests/unit/strres.properties
+        - js/xpconnect/crashtests
+        - js/xpconnect/tests
+        - js/src/frontend/BytecodeEmitter.cpp
+        - js/src/frontend/SharedContext.h
+        - layout/base/crashtests
+        - layout/base/tests
+        - layout/forms/crashtests
+        - layout/forms/test
+        - layout/generic/crashtests
+        - layout/generic/test
+        - layout/inspector/tests
+        - layout/mathml/tests
+        - layout/painting/crashtests/1405881-1.html
+        - layout/painting/crashtests/1407470-1.html
+        - layout/reftests
+        - layout/style/crashtests
+        - layout/style/test
+        - layout/svg/crashtests
+        - layout/tables/test/test_bug337124.html
+        - layout/tables/crashtests
+        - layout/xul/crashtests
+        - layout/xul/reftest
+        - layout/xul/test
+        - layout/xul/tree
+        - modules/libjar/zipwriter/test/unit/data/test_bug399727.html
+        - netwerk/test/crashtests
+        - netwerk/test/mochitests/test1.css
+        - netwerk/test/mochitests/test2.css
+        - parser/htmlparser/tests
+        - parser/html/java/named-character-references.html
+        - testing/perfdocs/generated/
+        - testing/talos/talos/pageloader/chrome/pageloader.xhtml
+        - testing/talos/talos/tests
+        - testing/web-platform/mozilla/tests/editor
+        - testing/web-platform/mozilla/tests/focus
+        - testing/web-platform/tests
+        - testing/web-platform/tests/conformance-checkers
+        - testing/web-platform/tests/content-security-policy
+        - testing/web-platform/tests/html
+        - testing/web-platform/tests/tools/lint/tests/dummy/broken.html
+        - testing/web-platform/tests/tools/lint/tests/dummy/broken_ignored.html
+        - toolkit/content/tests/chrome
+        - tools/jprof/README.html
+        - tools/lint/eslint
+        - tools/lint/test/test_clang_format.py
+        - view/crashtests
+        - widget/cocoa/crashtests
+        - widget/nsFilePickerProxy.cpp
+        - widget/tests
+        - widget/windows/tests/TestUrisToValidate.h
+        - xpcom/reflect/xptcall/porting.html
+        - xpcom/tests/test.properties
+        - xpcom/tests/unit/data/bug121341.properties
+        # Excluded below files because tests were failing unexpectedly
+        - dom/bindings/test/test_barewordGetsWindow.html
+        - devtools/client/styleeditor/test/sourcemap-css/sourcemaps.css
+        - devtools/client/styleeditor/test/sourcemap-css/contained.css
+        - devtools/client/styleeditor/test/sourcemap-css/test-stylus.css
+        - dom/bindings/test/file_barewordGetsWindow_frame1.html
+        - dom/bindings/test/file_barewordGetsWindow_frame2.html
+        - devtools/perfdocs/index.rst
+        - python/mozperftest/perfdocs/running.rst
+        - python/mozperftest/perfdocs/vision.rst
+        - python/mozperftest/perfdocs/writing.rst
+    extensions:
+        - .c
+        - .cc
+        - .cpp
+        - .css
+        - .dtd
+        - .idl
+        - .ftl
+        - .h
+        - .html
+        - .md
+        - .properties
+        - .py
+        - .rs
+        - .rst
+        - .webidl
+        - .xhtml
+    support-files:
+        - 'tools/lint/file-whitespace/**'
+    type: external
+    payload: file-whitespace:lint
diff --git a/tools/lint/file-whitespace/__init__.py b/tools/lint/file-whitespace/__init__.py
new file mode 100644
index 0000000000..ab7a6944b7
--- /dev/null
+++ b/tools/lint/file-whitespace/__init__.py
@@ -0,0 +1,124 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+results = []
+
+
+def lint(paths, config, fix=None, **lintargs):
+    files = list(expand_exclusions(paths, config, lintargs["root"]))
+    log = lintargs["log"]
+    fixed = 0
+
+    for f in files:
+        with open(f, "rb") as open_file:
+            hasFix = False
+            content_to_write = []
+
+            try:
+                lines = open_file.readlines()
+                # Check for Empty spaces or newline character at end of file
+                if lines[:].__len__() != 0 and lines[-1:][0].strip().__len__() == 0:
+                    # return file pointer to first
+                    open_file.seek(0)
+                    if fix:
+                        fixed += 1
+                        # fix Empty lines at end of file
+                        for i, line in reversed(list(enumerate(open_file))):
+                            # determine if line is empty
+                            if line.strip() != b"":
+                                with open(f, "wb") as write_file:
+                                    # determine if file's last line have \n, if not then add a \n
+                                    if not lines[i].endswith(b"\n"):
+                                        lines[i] = lines[i] + b"\n"
+                                    # write content to file
+                                    for e in lines[: i + 1]:
+                                        write_file.write(e)
+                                # end the loop
+                                break
+                    else:
+                        res = {
+                            "path": f,
+                            "message": "Empty Lines at end of file",
+                            "level": "error",
+                            "lineno": open_file.readlines()[:].__len__(),
+                        }
+                        results.append(result.from_config(config, **res))
+            except Exception as ex:
+                log.debug("Error: " + str(ex) + ", in file: " + f)
+
+            # return file pointer to first
+            open_file.seek(0)
+
+            lines = open_file.readlines()
+            # Detect missing newline at the end of the file
+            if lines[:].__len__() != 0 and not lines[-1].endswith(b"\n"):
+                if fix:
+                    fixed += 1
+                    with open(f, "wb") as write_file:
+                        # add a newline character at end of file
+                        lines[-1] = lines[-1] + b"\n"
+                        # write content to file
+                        for e in lines:
+                            write_file.write(e)
+                else:
+                    res = {
+                        "path": f,
+                        "message": "File does not end with newline character",
+                        "level": "error",
+                        "lineno": lines.__len__(),
+                    }
+                    results.append(result.from_config(config, **res))
+
+            # return file pointer to first
+            open_file.seek(0)
+
+            for i, line in enumerate(open_file):
+                if line.endswith(b" \n"):
+                    # We found a trailing whitespace
+                    if fix:
+                        # We want to fix it, strip the trailing spaces
+                        content_to_write.append(line.rstrip() + b"\n")
+                        fixed += 1
+                        hasFix = True
+                    else:
+                        res = {
+                            "path": f,
+                            "message": "Trailing whitespace",
+                            "level": "error",
+                            "lineno": i + 1,
+                        }
+                        results.append(result.from_config(config, **res))
+                else:
+                    if fix:
+                        content_to_write.append(line)
+            if hasFix:
+                # Only update the file when we found a change to make
+                with open(f, "wb") as open_file_to_write:
+                    open_file_to_write.write(b"".join(content_to_write))
+
+            # We are still using the same fp, let's return to the first
+            # line
+            open_file.seek(0)
+            # Open it as once as we just need to know if there is
+            # at least one \r\n
+            content = open_file.read()
+
+            if b"\r\n" in content:
+                if fix:
+                    fixed += 1
+                    content = content.replace(b"\r\n", b"\n")
+                    with open(f, "wb") as open_file_to_write:
+                        open_file_to_write.write(content)
+                else:
+                    res = {
+                        "path": f,
+                        "message": "Windows line return",
+                        "level": "error",
+                    }
+                    results.append(result.from_config(config, **res))
+
+    return {"results": results, "fixed": fixed}
diff --git a/tools/lint/fluent-lint.yml b/tools/lint/fluent-lint.yml
new file mode 100644
index 0000000000..8d8a5d956b
--- /dev/null
+++ b/tools/lint/fluent-lint.yml
@@ -0,0 +1,13 @@
+---
+fluent-lint:
+    description: Linter for Fluent files
+    exclude:
+        - dom/l10n/tests/mochitest/document_l10n/non-system-principal/localization/test.ftl
+    extensions: ['ftl']
+    support-files:
+        - 'tools/lint/fluent-lint**'
+    brand-files:
+        - 'browser/branding/official/locales/en-US/brand.ftl'
+        - 'toolkit/locales/en-US/toolkit/branding/brandings.ftl'
+    type: external
+    payload: fluent-lint:lint
diff --git a/tools/lint/fluent-lint/__init__.py b/tools/lint/fluent-lint/__init__.py
new file mode 100644
index 0000000000..3d0373ea01
--- /dev/null
+++ b/tools/lint/fluent-lint/__init__.py
@@ -0,0 +1,470 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import bisect
+import os
+import re
+from html.parser import HTMLParser
+
+import mozpack.path as mozpath
+import yaml
+from fluent.syntax import ast, parse, visitor
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+
+class TextElementHTMLParser(HTMLParser):
+    """HTML Parser for TextElement.
+
+    TextElements may contain embedded html tags, which can include
+    quotes in attributes. We only want to check the actual text.
+    """
+
+    def __init__(self):
+        super().__init__()
+        self.extracted_text = []
+
+    def handle_data(self, data):
+        self.extracted_text.append(data)
+
+
+class Linter(visitor.Visitor):
+    """Fluent linter implementation.
+
+    This subclasses the Fluent AST visitor. Methods are called corresponding
+    to each type of node in the Fluent AST. It is possible to control
+    whether a node is recursed into by calling the generic_visit method on
+    the superclass.
+
+    See the documentation here:
+    https://www.projectfluent.org/python-fluent/fluent.syntax/stable/usage.html
+    """
+
+    def __init__(
+        self, path, config, exclusions, contents, offsets_and_lines, brand_names=[]
+    ):
+        super().__init__()
+        self.path = path
+        self.config = config
+        self.exclusions = exclusions
+        self.contents = contents
+        self.offsets_and_lines = offsets_and_lines
+
+        self.results = []
+        self.identifier_re = re.compile(r"[a-z0-9-]+")
+        self.apostrophe_re = re.compile(r"\w'")
+        self.incorrect_apostrophe_re = re.compile(r"\w\u2018\w")
+        self.single_quote_re = re.compile(r"'(.+)'")
+        self.double_quote_re = re.compile(r"\".+\"")
+        self.ellipsis_re = re.compile(r"\.\.\.")
+
+        self.brand_names = brand_names
+        self.minimum_id_length = 9
+
+        self.state = {
+            # The resource comment should be at the top of the page after the license.
+            "node_can_be_resource_comment": True,
+            # Group comments must be followed by a message. Two group comments are not
+            # allowed in a row.
+            "can_have_group_comment": True,
+            # Comment bound to the current message
+            "comment": "",
+            # The current group comment
+            "group_comment": "",
+            # Variables in the current message
+            "variables": [],
+        }
+
+        # Set this to true to debug print the root node's json. This is useful for
+        # writing new lint rules, or debugging existing ones.
+        self.debug_print_json = False
+
+    def generic_visit(self, node):
+        node_name = type(node).__name__
+        self.state["node_can_be_resource_comment"] = self.state[
+            "node_can_be_resource_comment"
+        ] and (
+            # This is the root node.
+            node_name == "Resource"
+            # Empty space is allowed.
+            or node_name == "Span"
+            # Comments are allowed
+            or node_name == "Comment"
+        )
+
+        if self.debug_print_json:
+            import json
+
+            print(json.dumps(node.to_json(), indent=2))
+            # Only debug print the root node.
+            self.debug_print_json = False
+
+        super(Linter, self).generic_visit(node)
+
+    def visit_Attribute(self, node):
+        # Only visit values for Attribute nodes, the identifier comes from dom.
+        super().generic_visit(node.value)
+
+    def visit_FunctionReference(self, node):
+        # We don't recurse into function references, the identifiers there are
+        # allowed to be free form.
+        pass
+
+    def visit_Message(self, node):
+        # There must be at least one message or term between group comments.
+        self.state["can_have_group_comment"] = True
+        self.last_message_id = node.id.name
+
+        super().generic_visit(node)
+
+        # Check if variables are referenced in comments
+        if self.state["variables"]:
+            comments = self.state["comment"] + self.state["group_comment"]
+            missing_references = [
+                v for v in self.state["variables"] if f"${v}" not in comments
+            ]
+            if missing_references:
+                self.add_error(
+                    node,
+                    "VC01",
+                    "Messages including variables should have a comment "
+                    "explaining what will replace the variable. "
+                    "Missing references: "
+                    + ", ".join([f"${m}" for m in missing_references]),
+                )
+
+        # Reset current comment and variable references after reading the
+        # message.
+        self.state["comment"] = ""
+        self.state["variables"] = []
+
+    def visit_Term(self, node):
+        # There must be at least one message or term between group comments.
+        self.state["can_have_group_comment"] = True
+        self.last_message_id = None
+
+        super().generic_visit(node)
+
+        # Reset current comment and variable references after reading the term.
+        self.state["comment"] = ""
+        self.state["variables"] = []
+
+    def visit_MessageReference(self, node):
+        # We don't recurse into message references, the identifiers are either
+        # checked elsewhere or are attributes and come from DOM.
+        pass
+
+    def visit_Identifier(self, node):
+        if (
+            self.path not in self.exclusions["ID01"]["files"]
+            and node.name not in self.exclusions["ID01"]["messages"]
+            and not self.identifier_re.fullmatch(node.name)
+        ):
+            self.add_error(
+                node,
+                "ID01",
+                "Identifiers may only contain lowercase characters and -",
+            )
+        if (
+            len(node.name) < self.minimum_id_length
+            and self.path not in self.exclusions["ID02"]["files"]
+            and node.name not in self.exclusions["ID02"]["messages"]
+        ):
+            self.add_error(
+                node,
+                "ID02",
+                f"Identifiers must be at least {self.minimum_id_length} characters long",
+            )
+
+    def visit_TextElement(self, node):
+        parser = TextElementHTMLParser()
+        parser.feed(node.value)
+        for text in parser.extracted_text:
+            # To check for apostrophes, first remove pairs of straight quotes
+            # used as delimiters.
+            cleaned_str = re.sub(self.single_quote_re, "\1", node.value)
+            if self.apostrophe_re.search(cleaned_str):
+                self.add_error(
+                    node,
+                    "TE01",
+                    "Strings with apostrophes should use foo\u2019s instead of foo's.",
+                )
+            if self.incorrect_apostrophe_re.search(text):
+                self.add_error(
+                    node,
+                    "TE02",
+                    "Strings with apostrophes should use foo\u2019s instead of foo\u2018s.",
+                )
+            if self.single_quote_re.search(text):
+                self.add_error(
+                    node,
+                    "TE03",
+                    "Single-quoted strings should use Unicode \u2018foo\u2019 instead of 'foo'.",
+                )
+            if self.double_quote_re.search(text):
+                self.add_error(
+                    node,
+                    "TE04",
+                    'Double-quoted strings should use Unicode \u201cfoo\u201d instead of "foo".',
+                )
+            if self.ellipsis_re.search(text):
+                self.add_error(
+                    node,
+                    "TE05",
+                    "Strings with an ellipsis should use the Unicode \u2026 character"
+                    " instead of three periods",
+                )
+
+            # If part of a message, check for brand names
+            if (
+                self.last_message_id is not None
+                and self.path not in self.exclusions["CO01"]["files"]
+                and self.last_message_id not in self.exclusions["CO01"]["messages"]
+            ):
+                found_brands = []
+                for brand in self.brand_names:
+                    if brand in text:
+                        found_brands.append(brand)
+                if found_brands:
+                    self.add_error(
+                        node,
+                        "CO01",
+                        "Strings should use the corresponding terms instead of"
+                        f" hard-coded brand names ({', '.join(found_brands)})",
+                    )
+
+    def visit_ResourceComment(self, node):
+        # This node is a comment with: "###"
+        if not self.state["node_can_be_resource_comment"]:
+            self.add_error(
+                node,
+                "RC01",
+                "Resource comments (###) should be placed at the top of the file, just "
+                "after the license header. There should only be one resource comment "
+                "per file.",
+            )
+            return
+
+        lines_after = get_newlines_count_after(node.span, self.contents)
+        lines_before = get_newlines_count_before(node.span, self.contents)
+
+        if node.span.end == len(self.contents) - 1:
+            # This file only contains a resource comment.
+            return
+
+        if lines_after != 2:
+            self.add_error(
+                node,
+                "RC02",
+                "Resource comments (###) should be followed by one empty line.",
+            )
+            return
+
+        if lines_before != 2:
+            self.add_error(
+                node,
+                "RC03",
+                "Resource comments (###) should have one empty line above them.",
+            )
+            return
+
+    def visit_SelectExpression(self, node):
+        # We only want to visit the variant values, the identifiers in selectors
+        # and keys are allowed to be free form.
+        for variant in node.variants:
+            super().generic_visit(variant.value)
+
+        # Store the variable used for the SelectExpression, excluding functions
+        # like PLATFORM()
+        if (
+            type(node.selector) == ast.VariableReference
+            and node.selector.id.name not in self.state["variables"]
+        ):
+            self.state["variables"].append(node.selector.id.name)
+
+    def visit_Comment(self, node):
+        # This node is a comment with: "#"
+
+        # Store the comment
+        self.state["comment"] = node.content
+
+    def visit_GroupComment(self, node):
+        # This node is a comment with: "##"
+
+        # Store the group comment
+        self.state["group_comment"] = node.content
+
+        if not self.state["can_have_group_comment"]:
+            self.add_error(
+                node,
+                "GC04",
+                "Group comments (##) must be followed by at least one message "
+                "or term. Make sure that a single group comment with multiple "
+                "paragraphs is not separated by whitespace, as it will be "
+                "interpreted as two different comments.",
+            )
+            return
+
+        self.state["can_have_group_comment"] = False
+
+        lines_after = get_newlines_count_after(node.span, self.contents)
+        lines_before = get_newlines_count_before(node.span, self.contents)
+
+        if node.span.end == len(self.contents) - 1:
+            # The group comment is the last thing in the file.
+
+            if node.content == "":
+                # Empty comments are allowed at the end of the file.
+                return
+
+            self.add_error(
+                node,
+                "GC01",
+                "Group comments (##) should not be at the end of the file, they should "
+                "always be above a message. Only an empty group comment is allowed at "
+                "the end of a file.",
+            )
+            return
+
+        if lines_after != 2:
+            self.add_error(
+                node,
+                "GC02",
+                "Group comments (##) should be followed by one empty line.",
+            )
+            return
+
+        if lines_before != 2:
+            self.add_error(
+                node,
+                "GC03",
+                "Group comments (##) should have an empty line before them.",
+            )
+            return
+
+    def visit_VariableReference(self, node):
+        # Identifiers are allowed to be free form, but need to store them
+        # for comment checks.
+
+        if node.id.name not in self.state["variables"]:
+            self.state["variables"].append(node.id.name)
+
+    def add_error(self, node, rule, msg):
+        (col, line) = self.span_to_line_and_col(node.span)
+        res = {
+            "path": self.path,
+            "lineno": line,
+            "column": col,
+            "rule": rule,
+            "message": msg,
+        }
+        self.results.append(result.from_config(self.config, **res))
+
+    def span_to_line_and_col(self, span):
+        i = bisect.bisect_left(self.offsets_and_lines, (span.start, 0))
+        if i > 0:
+            col = span.start - self.offsets_and_lines[i - 1][0]
+        else:
+            col = 1 + span.start
+        return (col, self.offsets_and_lines[i][1])
+
+
+def get_offsets_and_lines(contents):
+    """Return a list consisting of tuples of (offset, line).
+
+    The Fluent AST contains spans of start and end offsets in the file.
+    This function returns a list of offsets and line numbers so that errors
+    can be reported using line and column.
+    """
+    line = 1
+    result = []
+    for m in re.finditer(r"\n", contents):
+        result.append((m.start(), line))
+        line += 1
+    return result
+
+
+def get_newlines_count_after(span, contents):
+    # Determine the number of newlines.
+    count = 0
+    for i in range(span.end, len(contents)):
+        assert contents[i] != "\r", "This linter does not handle \\r characters."
+        if contents[i] != "\n":
+            break
+        count += 1
+
+    return count
+
+
+def get_newlines_count_before(span, contents):
+    # Determine the range of newline characters.
+    count = 0
+    for i in range(span.start - 1, 0, -1):
+        assert contents[i] != "\r", "This linter does not handle \\r characters."
+        if contents[i] != "\n":
+            break
+        count += 1
+
+    return count
+
+
+def get_exclusions(root):
+    with open(
+        mozpath.join(root, "tools", "lint", "fluent-lint", "exclusions.yml")
+    ) as f:
+        exclusions = list(yaml.safe_load_all(f))[0]
+        for error_type in exclusions:
+            exclusions[error_type]["files"] = set(
+                [mozpath.join(root, x) for x in exclusions[error_type]["files"]]
+            )
+        return exclusions
+
+
+def get_branding_list(root, brand_files):
+    class MessageExtractor(visitor.Visitor):
+        def __init__(self):
+            self.brands = []
+            self.last_message_id = None
+
+        def visit_Term(self, node):
+            self.last_message_id = node.id.name
+            self.generic_visit(node)
+
+        def visit_TextElement(self, node):
+            if self.last_message_id:
+                self.brands += [node.value]
+                self.last_message_id = None
+            self.generic_visit(node)
+
+    extractor = MessageExtractor()
+
+    for brand_path in brand_files:
+        brand_file = mozpath.join(root, brand_path)
+        if os.path.exists(brand_file):
+            with open(brand_file, encoding="utf-8") as f:
+                messages = parse(f.read())
+                extractor.visit(messages)
+
+    return list(set(extractor.brands))
+
+
+def lint(paths, config, fix=None, **lintargs):
+    root = lintargs["root"]
+    files = list(expand_exclusions(paths, config, root))
+    exclusions = get_exclusions(root)
+    brand_files = config.get("brand-files")
+    brand_names = get_branding_list(root, brand_files)
+    results = []
+    for path in files:
+        contents = open(path, "r", encoding="utf-8").read()
+        linter = Linter(
+            path,
+            config,
+            exclusions,
+            contents,
+            get_offsets_and_lines(contents),
+            brand_names,
+        )
+        linter.visit(parse(contents))
+        results.extend(linter.results)
+    return results
diff --git a/tools/lint/fluent-lint/exclusions.yml b/tools/lint/fluent-lint/exclusions.yml
new file mode 100644
index 0000000000..ebcd1b0029
--- /dev/null
+++ b/tools/lint/fluent-lint/exclusions.yml
@@ -0,0 +1,198 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Warning: Only exclusions for identifiers (ID01) are currently allowed.
+---
+# Only add exceptions to this file if the ID is generated programmatically and
+# can't easily be changed to follow the naming convention.
+# Only lowercase letters and hyphens should be used in Fluent IDs.
+ID01:
+    messages:
+        - trademarkInfo
+        - crashed-include-URL-2
+        - blocklist-item-moz-std-listName
+        - blocklist-item-moz-full-listName
+        - shortcuts-browserAction2
+        - shortcuts-pageAction
+        - shortcuts-sidebarAction
+        - about-networking-originAttributesSuffix
+        - size-KB
+        - size-MB
+        - size-GB
+        - state-dd-Disabled
+        - state-dd-Disabled-block-list-state
+        - memory-unit-B
+        - memory-unit-KB
+        - memory-unit-MB
+        - memory-unit-GB
+        - memory-unit-TB
+        - memory-unit-PB
+        - memory-unit-EB
+        - enableSafeBrowsing-label
+        - about-telemetry-show-in-Firefox-json-viewer
+        - url-classifier-search-listType
+        # aboutDialog.ftl: Do not add new exceptions for this file,
+        # new strings should follow the naming convention.
+        - aboutDialog-title
+        - releaseNotes-link
+        - update-checkForUpdatesButton
+        - update-updateButton
+        - update-checkingForUpdates
+        - update-adminDisabled
+        - update-noUpdatesFound
+        - update-otherInstanceHandlingUpdates
+        - warningDesc-version
+        - bottomLinks-license
+        - bottomLinks-rights
+        - bottomLinks-privacy
+        - aboutDialog-version
+        - aboutDialog-version-nightly
+        # certError.ftl: These IDs are generated programmatically
+        # from certificate error codes.
+        - connectionFailure-title
+        - deniedPortAccess-title
+        - dnsNotFound-title
+        - fileNotFound-title
+        - fileAccessDenied-title
+        - captivePortal-title
+        - malformedURI-title
+        - netInterrupt-title
+        - notCached-title
+        - netOffline-title
+        - contentEncodingError-title
+        - unsafeContentType-title
+        - netReset-title
+        - netTimeout-title
+        - unknownProtocolFound-title
+        - proxyConnectFailure-title
+        - proxyResolveFailure-title
+        - redirectLoop-title
+        - unknownSocketType-title
+        - nssFailure2-title
+        - corruptedContentError-title
+        - sslv3Used-title
+        - inadequateSecurityError-title
+        - blockedByPolicy-title
+        - clockSkewError-title
+        - networkProtocolError-title
+        - nssBadCert-title
+        - nssBadCert-sts-title
+    files:
+        # policies-descriptions.ftl: These IDs are generated programmatically
+        # from policy names.
+        - browser/locales/en-US/browser/policies/policies-descriptions.ftl
+        # The webext-perms-description-* IDs are generated programmatically
+        # from permission names
+        - toolkit/locales/en-US/toolkit/global/extensionPermissions.ftl
+ID02:
+    messages:
+        # browser/components/ion/content/ion.ftl
+        - ion
+        # browser/locales/en-US/browser/aboutDialog.ftl
+        - helpus
+        # browser/locales/en-US/browser/aboutLogins.ftl
+        - menu
+        # browser/locales/en-US/browser/pageInfo.ftl
+        - copy
+        - perm-tab
+        # browser/locales/en-US/browser/tabContextMenu.ftl
+        - pin-tab
+        # browser/locales/en-US/browser/touchbar/touchbar.ftl
+        - back
+        - forward
+        - reload
+        - home
+        - find
+        - new-tab
+        - share
+        # toolkit/locales/en-US/toolkit/about/aboutPerformance.ftl
+        - type-tab
+        - size-KB
+        - size-MB
+        - size-GB
+        - item
+        # toolkit/locales/en-US/toolkit/about/aboutPlugins.ftl
+        - file-dd
+        - path-dd
+        # toolkit/locales/en-US/toolkit/about/aboutServiceWorkers.ftl
+        - scope
+        - waiting
+        # toolkit/locales/en-US/toolkit/about/aboutSupport.ftl
+        # yaml interprets yes and no as booleans if quotes are not present.
+        - "yes"
+        - "no"
+        - unknown
+        - found
+        - missing
+        - gpu-ram
+        - apz-none
+        # toolkit/locales/en-US/toolkit/printing/printDialogs.ftl
+        - portrait
+        - scale
+        - print-bg
+        - hf-blank
+        - hf-title
+        - hf-url
+        - hf-page
+    files: []
+# Hard-coded brand names like Firefox or Mozilla should be used only in
+# specific cases, in all other cases the corresponding terms should be used.
+# Check with the localization team for advice.
+CO01:
+    messages:
+        # browser/branding/official/locales/en-US/brand.ftl
+        - trademarkInfo
+        # toolkit/locales/en-US/toolkit/neterror/certError.ftl
+        - cert-error-mitm-mozilla
+        - cert-error-mitm-connection
+        # browser/locales/en-US/browser/appExtensionFields.ftl
+        - extension-firefox-alpenglow-name
+        # browser/locales/en-US/browser/browser.ftl
+        - identity-custom-root
+        - identity-description-custom-root2
+        # browser/locales/en-US/browser/migration.ftl
+        - import-from-firefox
+        # browser/locales/en-US/browser/migrationWizard.ftl
+        - migration-wizard-migrator-display-name-firefox
+        # browser/locales/en-US/browser/newtab/onboarding.ftl
+        - mr1-onboarding-welcome-image-caption
+        - mr2022-onboarding-gratitude-subtitle
+        # browser/locales/en-US/browser/policies/policies-descriptions.ftl
+        - policy-DisableFirefoxScreenshots
+        # browser/locales/en-US/browser/preferences/preferences.ftl
+        - sync-engine-addons
+        - sync-mobile-promo
+        # browser/locales/en-US/browser/protectionsPanel.ftl
+        - protections-panel-content-blocking-breakage-report-view-description
+        # devtools/client/locales/en-US/aboutdebugging.ftl
+        - about-debugging-setup-usb-step-enable-debug-firefox2
+        - about-debugging-browser-version-too-old-fennec
+        - about-debugging-browser-version-too-recent
+        # devtools/client/locales/en-US/application.ftl
+        - manifest-loaded-devtools-error
+        # toolkit/locales/en-US/toolkit/about/aboutAddons.ftl
+        - addon-badge-line3
+        - recommended-theme-1
+        # toolkit/locales/en-US/toolkit/about/aboutGlean.ftl
+        - about-glean-description
+        # toolkit/locales/en-US/toolkit/about/aboutPlugins.ftl
+        - plugins-openh264-description
+        # toolkit/locales/en-US/toolkit/about/aboutRights.ftl
+        - rights-intro-point-1
+        - rights-intro-point-2
+        # toolkit/locales/en-US/toolkit/about/aboutSupport.ftl
+        - app-basics-key-mozilla
+        - virtual-monitor-disp
+        # toolkit/locales/en-US/toolkit/about/aboutTelemetry.ftl
+        - about-telemetry-firefox-data-doc
+        - about-telemetry-telemetry-client-doc
+        - about-telemetry-telemetry-dashboard
+        # toolkit/locales/en-US/toolkit/global/extensionPermissions.ftl
+        - webext-perms-description-management
+        # toolkit/locales/en-US/toolkit/global/processTypes.ftl
+        - process-type-privilegedmozilla
+    files:
+        - browser/components/ion/content/ion.ftl
+        - browser/locales/en-US/browser/profile/default-bookmarks.ftl
+        - toolkit/locales/en-US/toolkit/about/aboutMozilla.ftl
diff --git a/tools/lint/hooks.py b/tools/lint/hooks.py
new file mode 100755
index 0000000000..fead62ec7e
--- /dev/null
+++ b/tools/lint/hooks.py
@@ -0,0 +1,63 @@
+#!/usr/bin/env python
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import signal
+import subprocess
+import sys
+from distutils.spawn import find_executable
+
+import six
+
+here = os.path.dirname(os.path.realpath(__file__))
+topsrcdir = os.path.join(here, os.pardir, os.pardir)
+
+
+def run_process(cmd):
+    proc = subprocess.Popen(cmd)
+
+    # ignore SIGINT, the mozlint subprocess should exit quickly and gracefully
+    orig_handler = signal.signal(signal.SIGINT, signal.SIG_IGN)
+    proc.wait()
+    signal.signal(signal.SIGINT, orig_handler)
+    return proc.returncode
+
+
+def run_mozlint(hooktype, args):
+    if isinstance(hooktype, six.binary_type):
+        hooktype = hooktype.decode("UTF-8", "replace")
+
+    python = find_executable("python3")
+    if not python:
+        print("error: Python 3 not detected on your system! Please install it.")
+        sys.exit(1)
+
+    cmd = [python, os.path.join(topsrcdir, "mach"), "lint"]
+
+    if "commit" in hooktype:
+        # don't prevent commits, just display the lint results
+        run_process(cmd + ["--workdir=staged"])
+        return False
+    elif "push" in hooktype:
+        return run_process(cmd + ["--outgoing"] + args)
+
+    print("warning: '{}' is not a valid mozlint hooktype".format(hooktype))
+    return False
+
+
+def hg(ui, repo, **kwargs):
+    hooktype = kwargs["hooktype"]
+    return run_mozlint(hooktype, kwargs.get("pats", []))
+
+
+def git():
+    hooktype = os.path.basename(__file__)
+    if hooktype == "hooks.py":
+        hooktype = "pre-push"
+    return run_mozlint(hooktype, [])
+
+
+if __name__ == "__main__":
+    sys.exit(git())
diff --git a/tools/lint/hooks_clang_format.py b/tools/lint/hooks_clang_format.py
new file mode 100755
index 0000000000..9adb81b7f0
--- /dev/null
+++ b/tools/lint/hooks_clang_format.py
@@ -0,0 +1,99 @@
+#!/usr/bin/env python3
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import subprocess
+import sys
+from subprocess import CalledProcessError, check_output
+
+here = os.path.dirname(os.path.realpath(__file__))
+topsrcdir = os.path.join(here, os.pardir, os.pardir)
+
+EXTRA_PATHS = (
+    "python/mach",
+    "python/mozbuild",
+    "python/mozversioncontrol",
+    "testing/mozbase/mozfile",
+    "third_party/python/jsmin",
+    "third_party/python/six",
+)
+sys.path[:0] = [os.path.join(topsrcdir, p) for p in EXTRA_PATHS]
+
+from mozversioncontrol import InvalidRepoPath, get_repository_object
+
+
+def run_clang_format(hooktype, changedFiles):
+    try:
+        vcs = get_repository_object(topsrcdir)
+    except InvalidRepoPath:
+        return
+
+    if not changedFiles:
+        # No files have been touched
+        return
+
+    # We have also a copy of this list in:
+    # python/mozbuild/mozbuild/mach_commands.py
+    # version-control-tools/hgext/clang-format/__init__.py
+    # release-services/src/staticanalysis/bot/static_analysis_bot/config.py
+    # Too heavy to import the full class just for this variable
+    extensions = (".cpp", ".c", ".cc", ".h", ".m", ".mm")
+    path_list = []
+    for filename in sorted(changedFiles):
+        # Ignore files unsupported in clang-format
+        if filename.endswith(extensions):
+            path_list.append(filename)
+
+    if not path_list:
+        # No files have been touched
+        return
+
+    arguments = ["clang-format", "-p"] + path_list
+    # On windows we need this to call the command in a shell, see Bug 1511594
+    if os.name == "nt":
+        clang_format_cmd = [sys.executable, "mach"] + arguments
+    else:
+        clang_format_cmd = [os.path.join(topsrcdir, "mach")] + arguments
+    if "commit" in hooktype:
+        # don't prevent commits, just display the clang-format results
+        subprocess.call(clang_format_cmd)
+
+        vcs.add_remove_files(*path_list)
+
+        return False
+    print("warning: '{}' is not a valid clang-format hooktype".format(hooktype))
+    return False
+
+
+def hg(ui, repo, node, **kwargs):
+    print(
+        "warning: this hook has been deprecated. Please use the hg extension instead.\n"
+        "please add 'clang-format = ~/.mozbuild/version-control-tools/hgext/clang-format'"
+        " to hgrc\n"
+        "Or run 'mach bootstrap'"
+    )
+    return False
+
+
+def git():
+    hooktype = os.path.basename(__file__)
+    if hooktype == "hooks_clang_format.py":
+        hooktype = "pre-push"
+
+    try:
+        changedFiles = check_output(
+            ["git", "diff", "--staged", "--diff-filter=d", "--name-only", "HEAD"],
+            text=True,
+        ).split()
+        # TODO we should detect if we are in a "add -p" mode and show a warning
+        return run_clang_format(hooktype, changedFiles)
+
+    except CalledProcessError:
+        print("Command to retrieve local files failed")
+        return 1
+
+
+if __name__ == "__main__":
+    sys.exit(git())
diff --git a/tools/lint/hooks_js_format.py b/tools/lint/hooks_js_format.py
new file mode 100755
index 0000000000..1b0386685e
--- /dev/null
+++ b/tools/lint/hooks_js_format.py
@@ -0,0 +1,83 @@
+#!/usr/bin/env python3
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import subprocess
+import sys
+from subprocess import CalledProcessError, check_output
+
+here = os.path.dirname(os.path.realpath(__file__))
+topsrcdir = os.path.join(here, os.pardir, os.pardir)
+
+EXTRA_PATHS = (
+    "python/mach",
+    "python/mozbuild",
+    "python/mozversioncontrol",
+    "testing/mozbase/mozfile",
+    "third_party/python/jsmin",
+)
+sys.path[:0] = [os.path.join(topsrcdir, p) for p in EXTRA_PATHS]
+
+from mozversioncontrol import InvalidRepoPath, get_repository_object
+
+
+def run_js_format(hooktype, changedFiles):
+    try:
+        vcs = get_repository_object(topsrcdir)
+    except InvalidRepoPath:
+        return
+
+    if not changedFiles:
+        # No files have been touched
+        return
+
+    extensions = (".js", ".jsx", ".jsm", ".json", ".mjs", "sjs", "html", "xhtml")
+    path_list = []
+    for filename in sorted(changedFiles):
+        # Ignore files unsupported in eslint and prettier
+        if filename.endswith(extensions):
+            path_list.append(filename)
+
+    if not path_list:
+        # No files have been touched
+        return
+
+    arguments = ["eslint", "--fix"] + path_list
+    # On windows we need this to call the command in a shell, see Bug 1511594
+    if os.name == "nt":
+        js_format_cmd = ["sh", "mach"] + arguments
+    else:
+        js_format_cmd = [os.path.join(topsrcdir, "mach")] + arguments
+    if "commit" in hooktype:
+        # don't prevent commits, just display the eslint and prettier results
+        subprocess.call(js_format_cmd)
+
+        vcs.add_remove_files(*path_list)
+
+        return False
+    print("warning: '{}' is not a valid js-format hooktype".format(hooktype))
+    return False
+
+
+def git():
+    hooktype = os.path.basename(__file__)
+    if hooktype == "hooks_js_format.py":
+        hooktype = "pre-push"
+
+    try:
+        changedFiles = check_output(
+            ["git", "diff", "--staged", "--diff-filter=d", "--name-only", "HEAD"],
+            text=True,
+        ).split()
+        # TODO we should detect if we are in a "add -p" mode and show a warning
+        return run_js_format(hooktype, changedFiles)
+
+    except CalledProcessError:
+        print("Command to retrieve local files failed")
+        return 1
+
+
+if __name__ == "__main__":
+    sys.exit(git())
diff --git a/tools/lint/l10n.yml b/tools/lint/l10n.yml
new file mode 100644
index 0000000000..85ad1aaabd
--- /dev/null
+++ b/tools/lint/l10n.yml
@@ -0,0 +1,37 @@
+---
+l10n:
+    description: Localization linter
+    # list of include directories of both
+    # browser and mobile/android l10n.tomls
+    include:
+        - browser/branding/official/locales/en-US
+        - browser/extensions/formautofill/locales/en-US
+        - browser/extensions/report-site-issue/locales/en-US
+        - browser/locales/en-US
+        - devtools/client/locales/en-US
+        - devtools/shared/locales/en-US
+        - devtools/startup/locales/en-US
+        - dom/locales/en-US
+        - mobile/android/locales/en-US
+        - netwerk/locales/en-US
+        - security/manager/locales/en-US
+        - toolkit/locales/en-US
+        - tools/lint/l10n.yml
+    # files not supported by compare-locales,
+    # and also not relevant to this linter
+    exclude:
+        - browser/locales/en-US/firefox-l10n.js
+        - mobile/android/locales/en-US/mobile-l10n.js
+        - toolkit/locales/en-US/chrome/global/intl.css
+    l10n_configs:
+        - browser/locales/l10n.toml
+        - mobile/android/locales/l10n.toml
+    type: external
+    payload: python.l10n_lint:lint
+    setup: python.l10n_lint:gecko_strings_setup
+    support-files:
+        - '**/l10n.toml'
+        - 'third_party/python/compare-locales/**'
+        - 'third_party/python/fluent/**'
+        - 'tools/lint/python/l10n_lint.py'
+        - 'tools/lint/l10n.yml'
diff --git a/tools/lint/libpref/__init__.py b/tools/lint/libpref/__init__.py
new file mode 100644
index 0000000000..e986be39d0
--- /dev/null
+++ b/tools/lint/libpref/__init__.py
@@ -0,0 +1,112 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import re
+import sys
+
+import yaml
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+# This simple linter checks for duplicates from
+# modules/libpref/init/StaticPrefList.yaml against modules/libpref/init/all.js
+
+# If for any reason a pref needs to appear in both files, add it to this set.
+IGNORE_PREFS = {
+    "devtools.console.stdout.chrome",  # Uses the 'sticky' attribute.
+    "devtools.console.stdout.content",  # Uses the 'sticky' attribute.
+    "fission.autostart",  # Uses the 'locked' attribute.
+    "browser.dom.window.dump.enabled",  # Uses the 'sticky' attribute.
+    "apz.fling_curve_function_y2",  # This pref is a part of a series.
+    "dom.postMessage.sharedArrayBuffer.bypassCOOP_COEP.insecure.enabled",  # NOQA: E501; Uses the 'locked' attribute.
+}
+PATTERN = re.compile(r"\s*pref\(\s*\"(?P<pref>.+)\"\s*,\s*(?P<val>.+)\)\s*;.*")
+
+
+def get_names(pref_list_filename):
+    pref_names = {}
+    # We want to transform patterns like 'foo: @VAR@' into valid yaml. This
+    # pattern does not happen in 'name', so it's fine to ignore these.
+    # We also want to evaluate all branches of #ifdefs for pref names, so we
+    # ignore anything else preprocessor related.
+    file = open(pref_list_filename).read().replace("@", "")
+    try:
+        pref_list = yaml.safe_load(file)
+    except (IOError, ValueError) as e:
+        print("{}: error:\n  {}".format(pref_list_filename, e), file=sys.stderr)
+        sys.exit(1)
+
+    for pref in pref_list:
+        if pref["name"] not in IGNORE_PREFS:
+            pref_names[pref["name"]] = pref["value"]
+
+    return pref_names
+
+
+# Check the names of prefs against each other, and if the pref is a duplicate
+# that has not previously been noted, add that name to the list of errors.
+def check_against(path, pref_names):
+    errors = []
+    prefs = read_prefs(path)
+    for pref in prefs:
+        if pref["name"] in pref_names:
+            errors.extend(check_value_for_pref(pref, pref_names[pref["name"]], path))
+    return errors
+
+
+def check_value_for_pref(some_pref, some_value, path):
+    errors = []
+    if some_pref["value"] == some_value:
+        errors.append(
+            {
+                "path": path,
+                "message": some_pref["raw"],
+                "lineno": some_pref["line"],
+                "hint": "Remove the duplicate pref or add it to IGNORE_PREFS.",
+                "level": "error",
+            }
+        )
+    return errors
+
+
+# The entries in the *.js pref files are regular enough to use simple pattern
+# matching to load in prefs.
+def read_prefs(path):
+    prefs = []
+    with open(path) as source:
+        for lineno, line in enumerate(source, start=1):
+            match = PATTERN.match(line)
+            if match:
+                prefs.append(
+                    {
+                        "name": match.group("pref"),
+                        "value": evaluate_pref(match.group("val")),
+                        "line": lineno,
+                        "raw": line,
+                    }
+                )
+    return prefs
+
+
+def evaluate_pref(value):
+    bools = {"true": True, "false": False}
+    if value in bools:
+        return bools[value]
+    elif value.isdigit():
+        return int(value)
+    return value
+
+
+def checkdupes(paths, config, **kwargs):
+    results = []
+    errors = []
+    pref_names = get_names(config["support-files"][0])
+    files = list(expand_exclusions(paths, config, kwargs["root"]))
+    for file in files:
+        errors.extend(check_against(file, pref_names))
+    for error in errors:
+        results.append(result.from_config(config, **error))
+    return results
diff --git a/tools/lint/license.yml b/tools/lint/license.yml
new file mode 100644
index 0000000000..f6bd6576ac
--- /dev/null
+++ b/tools/lint/license.yml
@@ -0,0 +1,94 @@
+---
+license:
+    description: License Check
+    include:
+        - .
+    exclude:
+        # These paths need to be triaged.
+        - build/pgo/js-input
+        # License not super clear
+        - browser/branding/
+        # Trademarks
+        - browser/components/pocket/content/panels/
+        - browser/components/newtab/data/content/tippytop/images/
+        - toolkit/components/pdfjs/content/web/images/
+        # We probably want a specific license
+        - browser/extensions/webcompat/injections/
+        # Different license
+        - build/pgo/blueprint/print.css
+        # Different license
+        - build/pgo/blueprint/screen.css
+        # Empty files
+        - config/external/nspr/_pl_bld.h
+        - config/external/nspr/_pr_bld.h
+        # Unknown origin
+        - gfx/2d/MMIHelpers.h
+        # might not work with license
+        - gradle.properties
+        # might not work with license
+        - gradle/wrapper/gradle-wrapper.properties
+        # Imported code that is dual Apache2 / MIT licensed
+        - intl/l10n/rust/l10nregistry-rs
+        # tests
+        - js/src/devtools/rootAnalysis/t/
+        - mobile/android/geckoview/src/main/AndroidManifest.xml
+        - mobile/android/geckoview/src/main/AndroidManifest_overlay.jinja
+        - mobile/android/geckoview/src/main/res/drawable/ic_generic_file.xml
+        - mobile/android/geckoview_example/src/main
+        - testing/webcompat/interventions/
+        - testing/webcompat/shims/
+        # might not work with license
+        - mobile/android/gradle/dotgradle-offline/gradle.properties
+        # might not work with license
+        - mobile/android/gradle/dotgradle-online/gradle.properties
+        # Almost empty file
+        - modules/libpref/greprefs.js
+        - parser/html/java/named-character-references.html
+        - python/mozlint/test/files/
+        # By design
+        - python/mozrelease/mozrelease
+        - security/mac/hardenedruntime/browser.developer.entitlements.xml
+        - security/mac/hardenedruntime/browser.production.entitlements.xml
+        - security/mac/hardenedruntime/developer.entitlements.xml
+        - security/mac/hardenedruntime/plugin-container.developer.entitlements.xml
+        - security/mac/hardenedruntime/plugin-container.production.entitlements.xml
+        - security/mac/hardenedruntime/production.entitlements.xml
+        - testing/marionette/harness/marionette_harness/www/
+        # Browsertime can't handle this script when there's a comment at the top
+        - testing/raptor/browsertime/browsertime_benchmark.js
+        - toolkit/components/reputationservice/chromium/chrome/common/safe_browsing/csd.pb.cc
+        - toolkit/components/reputationservice/chromium/chrome/common/safe_browsing/csd.pb.h
+        - toolkit/mozapps/update/updater/crctable.h
+        - tools/lint/eslint/eslint-plugin-mozilla/lib/configs
+        # template fragments used to generate .js sources.
+        - toolkit/components/uniffi-bindgen-gecko-js/src/templates/js
+        # By design
+        - tools/lint/test/
+    extensions:
+        - .c
+        - .cc
+        - .cpp
+        - .css
+        - .dtd
+        - .ftl
+        - .h
+        - .html
+        - .java
+        - .js
+        - .jsm
+        - .jsx
+        - .m
+        - .mm
+        - .mjs
+        - .properties
+        - .py
+        - .rs
+        - .svg
+        - .xhtml
+        - .xml
+        - .xul
+    support-files:
+        - 'tools/lint/license/**'
+    type: external
+    payload: license:lint
+    find-dotfiles: true
diff --git a/tools/lint/license/__init__.py b/tools/lint/license/__init__.py
new file mode 100644
index 0000000000..25139b49c5
--- /dev/null
+++ b/tools/lint/license/__init__.py
@@ -0,0 +1,195 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+here = os.path.abspath(os.path.dirname(__file__))
+
+results = []
+
+# Official source: https://www.mozilla.org/en-US/MPL/headers/
+TEMPLATES = {
+    "mpl2_license": """
+    This Source Code Form is subject to the terms of the Mozilla Public
+    License, v. 2.0. If a copy of the MPL was not distributed with this
+    file, You can obtain one at http://mozilla.org/MPL/2.0/.
+    """.strip().splitlines(),
+    "public_domain_license": """
+    Any copyright is dedicated to the public domain.
+    http://creativecommons.org/publicdomain/zero/1.0/
+    """.strip().splitlines(),
+}
+license_list = os.path.join(here, "valid-licenses.txt")
+
+
+def load_valid_license():
+    """
+    Load the list of license patterns
+    """
+    with open(license_list) as f:
+        l = f.readlines()
+        # Remove the empty lines
+        return list(filter(bool, [x.replace("\n", "") for x in l]))
+
+
+def is_valid_license(licenses, filename):
+    """
+    From a given file, check if we can find the license patterns
+    in the X first lines of the file
+    """
+    with open(filename, "r", errors="replace") as myfile:
+        contents = myfile.read()
+        # Empty files don't need a license.
+        if not contents:
+            return True
+
+        for l in licenses:
+            if l.lower().strip() in contents.lower():
+                return True
+    return False
+
+
+def add_header(log, filename, header):
+    """
+    Add the header to the top of the file
+    """
+    header.append("\n")
+    with open(filename, "r+") as f:
+        # lines in list format
+        try:
+            lines = f.readlines()
+        except UnicodeDecodeError as e:
+            log.debug("Could not read file '{}'".format(f))
+            log.debug("Error: {}".format(e))
+            return
+
+        i = 0
+        if lines:
+            # if the file isn't empty (__init__.py can be empty files)
+            if lines[0].startswith("#!") or lines[0].startswith("<?xml "):
+                i = 1
+
+            if lines[0].startswith("/* -*- Mode"):
+                i = 2
+        # Insert in the top of the data structure
+        lines[i:i] = header
+        f.seek(0, 0)
+        f.write("".join(lines))
+
+
+def is_test(f):
+    """
+    is the file a test or not?
+    """
+    if "lint/test/" in f:
+        # For the unit tests
+        return False
+    return (
+        "/tests/" in f
+        or "/test/" in f
+        or "/test_" in f
+        or "/gtest" in f
+        or "/crashtest" in f
+        or "/mochitest" in f
+        or "/reftest" in f
+        or "/imptest" in f
+        or "/androidTest" in f
+        or "/jit-test/" in f
+        or "jsapi-tests/" in f
+    )
+
+
+def fix_me(log, filename):
+    """
+    Add the copyright notice to the top of the file
+    """
+    _, ext = os.path.splitext(filename)
+    license = []
+
+    license_template = TEMPLATES["mpl2_license"]
+    test = False
+
+    if is_test(filename):
+        license_template = TEMPLATES["public_domain_license"]
+        test = True
+
+    if ext in [
+        ".cpp",
+        ".c",
+        ".cc",
+        ".h",
+        ".m",
+        ".mm",
+        ".rs",
+        ".java",
+        ".js",
+        ".jsm",
+        ".jsx",
+        ".css",
+    ]:
+        for i, l in enumerate(license_template):
+            start = " "
+            end = ""
+            if i == 0:
+                # first line, we have the /*
+                start = "/"
+            if i == len(license_template) - 1:
+                # Last line, we end by */
+                end = " */"
+            license.append(start + "* " + l.strip() + end + "\n")
+
+        add_header(log, filename, license)
+        return
+
+    if ext in [".py", ".ftl", ".properties"] or filename.endswith(".inc.xul"):
+        for l in license_template:
+            license.append("# " + l.strip() + "\n")
+        add_header(log, filename, license)
+        return
+
+    if ext in [".xml", ".xul", ".html", ".xhtml", ".dtd", ".svg"]:
+        for i, l in enumerate(license_template):
+            start = "   - "
+            end = ""
+            if i == 0:
+                # first line, we have the <!--
+                start = "<!-- "
+            if i == 2 or (i == 1 and test):
+                # Last line, we end by -->
+                end = " -->"
+            license.append(start + l.strip() + end)
+            if ext != ".svg" or end == "":
+                # When dealing with an svg, we should not have a space between
+                # the license and the content
+                license.append("\n")
+        add_header(log, filename, license)
+        return
+
+
+def lint(paths, config, fix=None, **lintargs):
+    log = lintargs["log"]
+    files = list(expand_exclusions(paths, config, lintargs["root"]))
+    fixed = 0
+
+    licenses = load_valid_license()
+    for f in files:
+        if is_test(f):
+            # For now, do not do anything with test (too many)
+            continue
+
+        if not is_valid_license(licenses, f):
+            res = {
+                "path": f,
+                "message": "No matching license strings found in tools/lint/license/valid-licenses.txt",  # noqa
+                "level": "error",
+            }
+            results.append(result.from_config(config, **res))
+            if fix:
+                fix_me(log, f)
+                fixed += 1
+
+    return {"results": results, "fixed": fixed}
diff --git a/tools/lint/license/valid-licenses.txt b/tools/lint/license/valid-licenses.txt
new file mode 100644
index 0000000000..8a1d39a69e
--- /dev/null
+++ b/tools/lint/license/valid-licenses.txt
@@ -0,0 +1,30 @@
+mozilla.org/MPL/
+Licensed under the Apache License, Version 2.0
+copyright is dedicated to the Public Domain.
+under the MIT
+Redistributions of source code must retain the above copyright
+Use of this source code is governed by a BSD-style license
+The author disclaims copyright to this source code.
+The author hereby disclaims copyright to this source code
+Use, Modification and Redistribution (including distribution of any
+author grants irrevocable permission to anyone to use, modify,
+THIS FILE IS AUTO-GENERATED
+Permission is hereby granted, free of charge, to any person obtaining
+Permission to use, copy, modify,
+License: Public domain. You are free to use this code however you
+You are granted a license to use, reproduce and create derivative works
+GENERATED FILE, DO NOT EDIT
+This code is governed by the BSD license
+This Source Code Form is subject to the terms of the Apache License
+DO NOT EDIT
+This program is made available under an ISC-style license.
+under MIT license
+License MIT per upstream
+DO NOT MODIFY
+GNU General Public License
+FILE IS GENERATED
+Generated by
+do not edit
+may be protected as a trademark in some jurisdictions
+The ASF licenses this file to You under the Apache License, Version 2.0
+Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions
diff --git a/tools/lint/lintpref.yml b/tools/lint/lintpref.yml
new file mode 100644
index 0000000000..cb58d642bc
--- /dev/null
+++ b/tools/lint/lintpref.yml
@@ -0,0 +1,17 @@
+---
+lintpref:
+    description: Linter for static prefs.
+    include:
+        - 'modules/libpref/init'
+        - 'browser/app/profile/'
+        - 'mobile/android/app/'
+        - 'devtools/client/preferences/'
+        - 'browser/branding/'
+        - 'mobile/android/installer/'
+        - 'mobile/android/locales/'
+    exclude: []
+    extensions: ['js']
+    type: external
+    payload: libpref:checkdupes
+    support-files:
+        - 'modules/libpref/init/StaticPrefList.yaml'
diff --git a/tools/lint/mach_commands.py b/tools/lint/mach_commands.py
new file mode 100644
index 0000000000..c9778e28a0
--- /dev/null
+++ b/tools/lint/mach_commands.py
@@ -0,0 +1,189 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import argparse
+import copy
+import os
+
+from mach.decorators import Command, CommandArgument
+from mozbuild.base import BuildEnvironmentNotFoundException
+from mozbuild.base import MachCommandConditions as conditions
+
+here = os.path.abspath(os.path.dirname(__file__))
+EXCLUSION_FILES = [
+    os.path.join("tools", "rewriting", "Generated.txt"),
+    os.path.join("tools", "rewriting", "ThirdPartyPaths.txt"),
+]
+
+EXCLUSION_FILES_OPTIONAL = []
+thunderbird_excludes = os.path.join("comm", "tools", "lint", "GlobalExclude.txt")
+if os.path.exists(thunderbird_excludes):
+    EXCLUSION_FILES_OPTIONAL.append(thunderbird_excludes)
+
+GLOBAL_EXCLUDES = ["**/node_modules", "tools/lint/test/files", ".hg", ".git"]
+
+VALID_FORMATTERS = {"black", "clang-format", "rustfmt", "isort"}
+VALID_ANDROID_FORMATTERS = {"android-format"}
+
+# Code-review bot must index issues from the whole codebase when pushing
+# to autoland or try repositories. In such cases, output warnings in the
+# task's JSON artifact but do not fail if only warnings are found.
+REPORT_WARNINGS = os.environ.get("GECKO_HEAD_REPOSITORY", "").rstrip("/") in (
+    "https://hg.mozilla.org/mozilla-central",
+    "https://hg.mozilla.org/integration/autoland",
+    "https://hg.mozilla.org/try",
+)
+
+
+def setup_argument_parser():
+    from mozlint import cli
+
+    return cli.MozlintParser()
+
+
+def get_global_excludes(**lintargs):
+    # exclude misc paths
+    excludes = GLOBAL_EXCLUDES[:]
+    topsrcdir = lintargs["root"]
+
+    # exclude top level paths that look like objdirs
+    excludes.extend(
+        [
+            name
+            for name in os.listdir(topsrcdir)
+            if name.startswith("obj") and os.path.isdir(name)
+        ]
+    )
+
+    if lintargs.get("include_thirdparty"):
+        # For some linters, we want to include the thirdparty code too.
+        # Example: trojan-source linter should run also on third party code.
+        return excludes
+
+    for path in EXCLUSION_FILES + EXCLUSION_FILES_OPTIONAL:
+        with open(os.path.join(topsrcdir, path), "r") as fh:
+            excludes.extend([f.strip() for f in fh.readlines()])
+
+    return excludes
+
+
+@Command(
+    "lint",
+    category="devenv",
+    description="Run linters.",
+    parser=setup_argument_parser,
+    virtualenv_name="lint",
+)
+def lint(command_context, *runargs, **lintargs):
+    """Run linters."""
+    command_context.activate_virtualenv()
+    from mozlint import cli, parser
+
+    try:
+        buildargs = {}
+        buildargs["substs"] = copy.deepcopy(dict(command_context.substs))
+        buildargs["defines"] = copy.deepcopy(dict(command_context.defines))
+        buildargs["topobjdir"] = command_context.topobjdir
+        lintargs.update(buildargs)
+    except BuildEnvironmentNotFoundException:
+        pass
+
+    lintargs.setdefault("root", command_context.topsrcdir)
+    lintargs["exclude"] = get_global_excludes(**lintargs)
+    lintargs["config_paths"].insert(0, here)
+    lintargs["virtualenv_bin_path"] = command_context.virtualenv_manager.bin_path
+    lintargs["virtualenv_manager"] = command_context.virtualenv_manager
+    if REPORT_WARNINGS and lintargs.get("show_warnings") is None:
+        lintargs["show_warnings"] = "soft"
+    for path in EXCLUSION_FILES:
+        parser.GLOBAL_SUPPORT_FILES.append(
+            os.path.join(command_context.topsrcdir, path)
+        )
+    setupargs = {
+        "mach_command_context": command_context,
+    }
+    return cli.run(*runargs, setupargs=setupargs, **lintargs)
+
+
+@Command(
+    "eslint",
+    category="devenv",
+    description="Run eslint or help configure eslint for optimal development.",
+)
+@CommandArgument(
+    "paths",
+    default=None,
+    nargs="*",
+    help="Paths to file or directories to lint, like "
+    "'browser/' Defaults to the "
+    "current directory if not given.",
+)
+@CommandArgument(
+    "-s",
+    "--setup",
+    default=False,
+    action="store_true",
+    help="Configure eslint for optimal development.",
+)
+@CommandArgument("-b", "--binary", default=None, help="Path to eslint binary.")
+@CommandArgument(
+    "--fix",
+    default=False,
+    action="store_true",
+    help="Request that eslint automatically fix errors, where possible.",
+)
+@CommandArgument(
+    "--rule",
+    default=[],
+    dest="rules",
+    action="append",
+    help="Specify an additional rule for ESLint to run, e.g. 'no-new-object: error'",
+)
+@CommandArgument(
+    "extra_args",
+    nargs=argparse.REMAINDER,
+    help="Extra args that will be forwarded to eslint.",
+)
+def eslint(command_context, paths, extra_args=[], **kwargs):
+    command_context._mach_context.commands.dispatch(
+        "lint",
+        command_context._mach_context,
+        linters=["eslint"],
+        paths=paths,
+        argv=extra_args,
+        **kwargs
+    )
+
+
+@Command(
+    "format",
+    category="devenv",
+    description="Format files, alternative to 'lint --fix' ",
+    parser=setup_argument_parser,
+)
+def format_files(command_context, paths, extra_args=[], **kwargs):
+    linters = kwargs["linters"]
+
+    formatters = VALID_FORMATTERS
+    if conditions.is_android(command_context):
+        formatters |= VALID_ANDROID_FORMATTERS
+
+    if not linters:
+        linters = formatters
+    else:
+        invalid_linters = set(linters) - formatters
+        if invalid_linters:
+            print(
+                "error: One or more linters passed are not valid formatters. "
+                "Note that only the following linters are valid formatters:"
+            )
+            print("\n".join(sorted(formatters)))
+            return 1
+
+    kwargs["linters"] = list(linters)
+
+    kwargs["fix"] = True
+    command_context._mach_context.commands.dispatch(
+        "lint", command_context._mach_context, paths=paths, argv=extra_args, **kwargs
+    )
diff --git a/tools/lint/mingw-capitalization.yml b/tools/lint/mingw-capitalization.yml
new file mode 100644
index 0000000000..04c9c79e16
--- /dev/null
+++ b/tools/lint/mingw-capitalization.yml
@@ -0,0 +1,12 @@
+---
+mingw-capitalization:
+    description: >
+      "A Windows include file is not lowercase, and may break the MinGW build"
+    extensions: ['h', 'cpp', 'cc', 'c']
+    include: ['.']
+    exclude:
+        # We do not compile WebRTC with MinGW yet
+        - media/webrtc
+    type: external
+    level: error
+    payload: cpp.mingw-capitalization:lint
diff --git a/tools/lint/mscom-init.yml b/tools/lint/mscom-init.yml
new file mode 100644
index 0000000000..8c0af6ffcf
--- /dev/null
+++ b/tools/lint/mscom-init.yml
@@ -0,0 +1,46 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+forbid-mscom-init:
+    description: >-
+        New calls to CoInitialize, CoInitializeEx, OleInitialize, RoInitialize,
+        CoUninitialize, OleUninitialize, or RoUninitialize are forbidden. If you
+        have questions, please consult a peer of the IPC: MSCOM module.
+    level: error
+    include: ['.']
+    type: regex
+    payload: ([CR]o|Ole)(Uni|I)nitialize(Ex)?
+    ignore-case: false
+    extensions:
+        - h
+        - c
+        - cc
+        - cpp
+    exclude:
+        # These files are the only allowable locations
+        - ipc/mscom/ApartmentRegion.h
+        - ipc/mscom/COMWrappers.cpp
+        - ipc/mscom/COMWrappers.h
+        - ipc/mscom/ProcessRuntime.cpp
+        - ipc/mscom/EnsureMTA.cpp
+        # These files are existing locations that must eventually be fixed.
+        - browser/components/migration/nsIEHistoryEnumerator.cpp
+        - browser/components/migration/tests/unit/insertIEHistory/InsertIEHistory.cpp
+        - browser/components/shell/nsWindowsShellService.cpp
+        - gfx/thebes/gfxWindowsPlatform.cpp
+        - image/DecodePool.cpp
+        - ipc/glue/BrowserProcessSubThread.cpp
+        - netwerk/system/win32/nsNotifyAddrListener.cpp
+        - toolkit/components/parentalcontrols/nsParentalControlsServiceWin.cpp
+        - toolkit/crashreporter/google-breakpad/src/common/windows/pdb_source_line_writer.cc
+        - toolkit/mozapps/defaultagent/main.cpp
+        - uriloader/exthandler/win/nsOSHelperAppService.cpp
+        - widget/windows/InkCollector.cpp
+        - widget/windows/TaskbarPreview.cpp
+        - widget/windows/WinTaskbar.cpp
+        - widget/windows/nsAppShell.cpp
+        - widget/windows/nsWindow.cpp
+        - widget/windows/nsWindow.h
+        - widget/windows/tests/TestUriValidation.cpp
+        - xpcom/io/nsLocalFileWin.cpp
diff --git a/tools/lint/perfdocs.yml b/tools/lint/perfdocs.yml
new file mode 100644
index 0000000000..7396361397
--- /dev/null
+++ b/tools/lint/perfdocs.yml
@@ -0,0 +1,17 @@
+---
+perfdocs:
+    description: Performance Documentation linter
+    # This task handles its own search, so just include cwd
+    include: [
+        'python/mozperftest',
+        'testing/awsy',
+        'testing/raptor',
+        'testing/talos',
+        'testing/performance/fxrecord',
+        'testing/performance/mach-try-perf',
+    ]
+    exclude: []
+    extensions: ['rst', 'ini', 'yml']
+    support-files: []
+    type: structured_log
+    payload: perfdocs:lint
diff --git a/tools/lint/perfdocs/__init__.py b/tools/lint/perfdocs/__init__.py
new file mode 100644
index 0000000000..1194d38624
--- /dev/null
+++ b/tools/lint/perfdocs/__init__.py
@@ -0,0 +1,13 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import os
+
+from perfdocs import perfdocs
+
+here = os.path.abspath(os.path.dirname(__file__))
+PERFDOCS_REQUIREMENTS_PATH = os.path.join(here, "requirements.txt")
+
+
+def lint(paths, config, logger, fix=False, **lintargs):
+    return perfdocs.run_perfdocs(config, logger=logger, paths=paths, generate=fix)
diff --git a/tools/lint/perfdocs/doc_helpers.py b/tools/lint/perfdocs/doc_helpers.py
new file mode 100644
index 0000000000..709f190204
--- /dev/null
+++ b/tools/lint/perfdocs/doc_helpers.py
@@ -0,0 +1,85 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+class MismatchedRowLengthsException(Exception):
+    """
+    This exception is thrown when there is a mismatch between the number of items in a row,
+    and the number of headers defined.
+    """
+
+    pass
+
+
+class TableBuilder(object):
+    """
+    Helper class for building tables.
+    """
+
+    def __init__(self, title, widths, header_rows, headers, indent=0):
+        """
+        :param title: str - Title of the table
+        :param widths: list of str - Widths of each column of the table
+        :param header_rows: int - Number of header rows
+        :param headers: 2D list of str - Headers
+        :param indent: int - Number of spaces to indent table
+        """
+        if not isinstance(title, str):
+            raise TypeError("TableBuilder attribute title must be a string.")
+        if not isinstance(widths, list) or not isinstance(widths[0], int):
+            raise TypeError("TableBuilder attribute widths must be a list of integers.")
+        if not isinstance(header_rows, int):
+            raise TypeError("TableBuilder attribute header_rows must be an integer.")
+        if (
+            not isinstance(headers, list)
+            or not isinstance(headers[0], list)
+            or not isinstance(headers[0][0], str)
+        ):
+            raise TypeError(
+                "TableBuilder attribute headers must be a two-dimensional list of strings."
+            )
+        if not isinstance(indent, int):
+            raise TypeError("TableBuilder attribute indent must be an integer.")
+
+        self.title = title
+        self.widths = widths
+        self.header_rows = header_rows
+        self.headers = headers
+        self.indent = " " * indent
+        self.table = ""
+        self._build_table()
+
+    def _build_table(self):
+        if len(self.widths) != len(self.headers[0]):
+            raise MismatchedRowLengthsException(
+                "Number of table headers must match number of column widths."
+            )
+        widths = " ".join(map(str, self.widths))
+        self.table += (
+            f"{self.indent}.. list-table:: **{self.title}**\n"
+            f"{self.indent}   :widths: {widths}\n"
+            f"{self.indent}   :header-rows: {self.header_rows}\n\n"
+        )
+        self.add_rows(self.headers)
+
+    def add_rows(self, rows):
+        if type(rows) != list or type(rows[0]) != list or type(rows[0][0]) != str:
+            raise TypeError("add_rows() requires a two-dimensional list of strings.")
+        for row in rows:
+            self.add_row(row)
+
+    def add_row(self, values):
+        if len(values) != len(self.widths):
+            raise MismatchedRowLengthsException(
+                "Number of items in a row must must number of columns defined."
+            )
+        for i, val in enumerate(values):
+            if i == 0:
+                self.table += f"{self.indent}   * - **{val}**\n"
+            else:
+                self.table += f"{self.indent}     - {val}\n"
+
+    def finish_table(self):
+        self.table += "\n"
+        return self.table
diff --git a/tools/lint/perfdocs/framework_gatherers.py b/tools/lint/perfdocs/framework_gatherers.py
new file mode 100644
index 0000000000..a1dbf8ba52
--- /dev/null
+++ b/tools/lint/perfdocs/framework_gatherers.py
@@ -0,0 +1,571 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import json
+import os
+import pathlib
+import re
+
+from gecko_taskgraph.util.attributes import match_run_on_projects
+from manifestparser import TestManifest
+from mozperftest.script import ScriptInfo
+
+from perfdocs.doc_helpers import TableBuilder
+from perfdocs.logger import PerfDocLogger
+from perfdocs.utils import read_yaml
+
+logger = PerfDocLogger()
+
+BRANCHES = [
+    "mozilla-central",
+    "autoland",
+    "mozilla-release",
+    "mozilla-beta",
+]
+
+"""
+This file is for framework specific gatherers since manifests
+might be parsed differently in each of them. The gatherers
+must implement the FrameworkGatherer class.
+"""
+
+
+class FrameworkGatherer(object):
+    """
+    Abstract class for framework gatherers.
+    """
+
+    def __init__(self, yaml_path, workspace_dir, taskgraph={}):
+        """
+        Generic initialization for a framework gatherer.
+        """
+        self.workspace_dir = workspace_dir
+        self._yaml_path = yaml_path
+        self._taskgraph = taskgraph
+        self._suite_list = {}
+        self._test_list = {}
+        self._descriptions = {}
+        self._manifest_path = ""
+        self._manifest = None
+        self.script_infos = {}
+        self._task_list = {}
+        self._task_match_pattern = re.compile(r"([\w\W]*/[pgo|opt]*)-([\w\W]*)")
+
+    def get_task_match(self, task_name):
+        return re.search(self._task_match_pattern, task_name)
+
+    def get_manifest_path(self):
+        """
+        Returns the path to the manifest based on the
+        manifest entry in the frameworks YAML configuration
+        file.
+
+        :return str: Path to the manifest.
+        """
+        if self._manifest_path:
+            return self._manifest_path
+
+        yaml_content = read_yaml(self._yaml_path)
+        self._manifest_path = pathlib.Path(self.workspace_dir, yaml_content["manifest"])
+        return self._manifest_path
+
+    def get_suite_list(self):
+        """
+        Each framework gatherer must return a dictionary with
+        the following structure. Note that the test names must
+        be relative paths so that issues can be correctly issued
+        by the reviewbot.
+
+        :return dict: A dictionary with the following structure: {
+                "suite_name": [
+                    'testing/raptor/test1',
+                    'testing/raptor/test2'
+                ]
+            }
+        """
+        raise NotImplementedError
+
+    def _build_section_with_header(self, title, content, header_type=None):
+        """
+        Adds a section to the documentation with the title as the type mentioned
+        and paragraph as content mentioned.
+        :param title: title of the section
+        :param content: content of section paragraph
+        :param header_type: type of the title heading
+        """
+        heading_map = {"H2": "*", "H3": "=", "H4": "-", "H5": "^"}
+        return [title, heading_map.get(header_type, "^") * len(title), content, ""]
+
+
+class RaptorGatherer(FrameworkGatherer):
+    """
+    Gatherer for the Raptor framework.
+    """
+
+    def get_suite_list(self):
+        """
+        Returns a dictionary containing a mapping from suites
+        to the tests they contain.
+
+        :return dict: A dictionary with the following structure: {
+                "suite_name": [
+                    'testing/raptor/test1',
+                    'testing/raptor/test2'
+                ]
+            }
+        """
+        if self._suite_list:
+            return self._suite_list
+
+        manifest_path = self.get_manifest_path()
+
+        # Get the tests from the manifest
+        test_manifest = TestManifest([str(manifest_path)], strict=False)
+        test_list = test_manifest.active_tests(exists=False, disabled=False)
+
+        # Parse the tests into the expected dictionary
+        for test in test_list:
+            # Get the top-level suite
+            s = os.path.basename(test["here"])
+            if s not in self._suite_list:
+                self._suite_list[s] = []
+
+            # Get the individual test
+            fpath = re.sub(".*testing", "testing", test["manifest"])
+
+            if fpath not in self._suite_list[s]:
+                self._suite_list[s].append(fpath)
+
+        return self._suite_list
+
+    def _get_ci_tasks(self):
+        for task in self._taskgraph.keys():
+            if type(self._taskgraph[task]) == dict:
+                command = self._taskgraph[task]["task"]["payload"].get("command", [])
+                run_on_projects = self._taskgraph[task]["attributes"]["run_on_projects"]
+            else:
+                command = self._taskgraph[task].task["payload"].get("command", [])
+                run_on_projects = self._taskgraph[task].attributes["run_on_projects"]
+
+            test_match = re.search(r"[\s']--test[\s=](.+?)[\s']", str(command))
+            task_match = self.get_task_match(task)
+            if test_match and task_match:
+                test = test_match.group(1)
+                platform = task_match.group(1)
+                test_name = task_match.group(2)
+
+                item = {"test_name": test_name, "run_on_projects": run_on_projects}
+                self._task_list.setdefault(test, {}).setdefault(platform, []).append(
+                    item
+                )
+
+    def _get_subtests_from_ini(self, manifest_path, suite_name):
+        """
+        Returns a list of (sub)tests from an ini file containing the test definitions.
+
+        :param str manifest_path: path to the ini file
+        :return list: the list of the tests
+        """
+        desc_exclusion = ["here", "manifest_relpath", "path", "relpath"]
+        test_manifest = TestManifest([str(manifest_path)], strict=False)
+        test_list = test_manifest.active_tests(exists=False, disabled=False)
+        subtests = {}
+        for subtest in test_list:
+            subtests[subtest["name"]] = subtest["manifest"]
+
+            description = {}
+            for key, value in subtest.items():
+                if key not in desc_exclusion:
+                    description[key] = value
+
+            # Prepare alerting metrics for verification
+            description["metrics"] = [
+                metric.strip()
+                for metric in description.get("alert_on", "").split(",")
+                if metric.strip() != ""
+            ]
+
+            subtests[subtest["name"]] = description
+            self._descriptions.setdefault(suite_name, []).append(description)
+
+        self._descriptions[suite_name].sort(key=lambda item: item["name"])
+
+        return subtests
+
+    def get_test_list(self):
+        """
+        Returns a dictionary containing the tests in every suite ini file.
+
+        :return dict: A dictionary with the following structure: {
+                "suite_name": {
+                    'raptor_test1',
+                    'raptor_test2'
+                },
+            }
+        """
+        if self._test_list:
+            return self._test_list
+
+        suite_list = self.get_suite_list()
+
+        # Iterate over each manifest path from suite_list[suite_name]
+        # and place the subtests into self._test_list under the same key
+        for suite_name, manifest_paths in suite_list.items():
+            if not self._test_list.get(suite_name):
+                self._test_list[suite_name] = {}
+            for manifest_path in manifest_paths:
+                subtest_list = self._get_subtests_from_ini(manifest_path, suite_name)
+                self._test_list[suite_name].update(subtest_list)
+
+        self._get_ci_tasks()
+
+        return self._test_list
+
+    def build_test_description(self, title, test_description="", suite_name=""):
+        matcher = []
+        browsers = [
+            "firefox",
+            "chrome",
+            "chromium",
+            "refbrow",
+            "fennec68",
+            "geckoview",
+            "fenix",
+        ]
+        test_name = [f"{title}-{browser}" for browser in browsers]
+        test_name.append(title)
+
+        for suite, val in self._descriptions.items():
+            for test in val:
+                if test["name"] in test_name and suite_name == suite:
+                    matcher.append(test)
+
+        if len(matcher) == 0:
+            logger.critical(
+                "No tests exist for the following name "
+                "(obtained from config.yml): {}".format(title)
+            )
+            raise Exception(
+                "No tests exist for the following name "
+                "(obtained from config.yml): {}".format(title)
+            )
+
+        result = f".. dropdown:: {title}\n"
+        result += f"   :class-container: anchor-id-{title}-{suite_name[0]}\n\n"
+
+        for idx, description in enumerate(matcher):
+            if description["name"] != title:
+                result += f"   {idx+1}. **{description['name']}**\n\n"
+            if "owner" in description.keys():
+                result += f"   **Owner**: {description['owner']}\n\n"
+
+            for key in sorted(description.keys()):
+                if key in ["owner", "name", "manifest", "metrics"]:
+                    continue
+                sub_title = key.replace("_", " ")
+                if key == "test_url":
+                    if "<" in description[key] or ">" in description[key]:
+                        description[key] = description[key].replace("<", "\<")
+                        description[key] = description[key].replace(">", "\>")
+                    result += f"   * **{sub_title}**: `<{description[key]}>`__\n"
+                elif key == "secondary_url":
+                    result += f"   * **{sub_title}**: `<{description[key]}>`__\n"
+                elif key in ["playback_pageset_manifest"]:
+                    result += (
+                        f"   * **{sub_title}**: "
+                        f"{description[key].replace('{subtest}', description['name'])}\n"
+                    )
+                else:
+                    if "\n" in description[key]:
+                        description[key] = description[key].replace("\n", " ")
+                    result += f"   * **{sub_title}**: {description[key]}\n"
+
+            if self._task_list.get(title, []):
+                result += "   * **Test Task**:\n\n"
+                for platform in sorted(self._task_list[title]):
+                    self._task_list[title][platform].sort(key=lambda x: x["test_name"])
+
+                    table = TableBuilder(
+                        title=platform,
+                        widths=[30] + [15 for x in BRANCHES],
+                        header_rows=1,
+                        headers=[["Test Name"] + BRANCHES],
+                        indent=3,
+                    )
+
+                    for task in self._task_list[title][platform]:
+                        values = [task["test_name"]]
+                        values += [
+                            "\u2705"
+                            if match_run_on_projects(x, task["run_on_projects"])
+                            else "\u274C"
+                            for x in BRANCHES
+                        ]
+                        table.add_row(values)
+                    result += f"{table.finish_table()}\n"
+
+        return [result]
+
+    def build_suite_section(self, title, content):
+        return self._build_section_with_header(
+            title.capitalize(), content, header_type="H4"
+        )
+
+
+class MozperftestGatherer(FrameworkGatherer):
+    """
+    Gatherer for the Mozperftest framework.
+    """
+
+    def get_test_list(self):
+        """
+        Returns a dictionary containing the tests that are in perftest.ini manifest.
+
+        :return dict: A dictionary with the following structure: {
+                "suite_name": {
+                    'perftest_test1',
+                    'perftest_test2',
+                },
+            }
+        """
+        for path in pathlib.Path(self.workspace_dir).rglob("perftest.ini"):
+            if "obj-" in str(path):
+                continue
+            suite_name = str(path.parent).replace(str(self.workspace_dir), "")
+
+            # If the workspace dir doesn't end with a forward-slash,
+            # the substitution above won't work completely
+            if suite_name.startswith("/") or suite_name.startswith("\\"):
+                suite_name = suite_name[1:]
+
+            # We have to add new paths to the logger as we search
+            # because mozperftest tests exist in multiple places in-tree
+            PerfDocLogger.PATHS.append(suite_name)
+
+            # Get the tests from perftest.ini
+            test_manifest = TestManifest([str(path)], strict=False)
+            test_list = test_manifest.active_tests(exists=False, disabled=False)
+            for test in test_list:
+                si = ScriptInfo(test["path"])
+                self.script_infos[si["name"]] = si
+                self._test_list.setdefault(suite_name.replace("\\", "/"), {}).update(
+                    {si["name"]: {"path": str(path)}}
+                )
+
+        return self._test_list
+
+    def build_test_description(self, title, test_description="", suite_name=""):
+        return [str(self.script_infos[title])]
+
+    def build_suite_section(self, title, content):
+        return self._build_section_with_header(title, content, header_type="H4")
+
+
+class TalosGatherer(FrameworkGatherer):
+    def _get_ci_tasks(self):
+        with open(
+            pathlib.Path(self.workspace_dir, "testing", "talos", "talos.json")
+        ) as f:
+            config_suites = json.load(f)["suites"]
+
+        for task_name in self._taskgraph.keys():
+            task = self._taskgraph[task_name]
+
+            if type(task) == dict:
+                is_talos = task["task"]["extra"].get("suite", [])
+                command = task["task"]["payload"].get("command", [])
+                run_on_projects = task["attributes"]["run_on_projects"]
+            else:
+                is_talos = task.task["extra"].get("suite", [])
+                command = task.task["payload"].get("command", [])
+                run_on_projects = task.attributes["run_on_projects"]
+
+            suite_match = re.search(r"[\s']--suite[\s=](.+?)[\s']", str(command))
+            task_match = self.get_task_match(task_name)
+            if "talos" == is_talos and task_match:
+                suite = suite_match.group(1)
+                platform = task_match.group(1)
+                test_name = task_match.group(2)
+                item = {"test_name": test_name, "run_on_projects": run_on_projects}
+
+                for test in config_suites[suite]["tests"]:
+                    self._task_list.setdefault(test, {}).setdefault(
+                        platform, []
+                    ).append(item)
+
+    def get_test_list(self):
+        from talos import test as talos_test
+
+        test_lists = talos_test.test_dict()
+        mod = __import__("talos.test", fromlist=test_lists)
+
+        suite_name = "Talos Tests"
+
+        for test in test_lists:
+            self._test_list.setdefault(suite_name, {}).update({test: {}})
+
+            klass = getattr(mod, test)
+            self._descriptions.setdefault(test, klass.__dict__)
+
+        self._get_ci_tasks()
+
+        return self._test_list
+
+    def build_test_description(self, title, test_description="", suite_name=""):
+        result = f".. dropdown:: {title}\n"
+        result += f"   :class-container: anchor-id-{title}\n\n"
+
+        yml_descriptions = [s.strip() for s in test_description.split("- ") if s]
+        for description in yml_descriptions:
+            if "Example Data" in description:
+                # Example Data for using code block
+                example_list = [s.strip() for s in description.split("* ")]
+                result += f"   * {example_list[0]}\n"
+                result += "\n   .. code-block::\n\n"
+                for example in example_list[1:]:
+                    result += f"      {example}\n"
+                result += "\n"
+
+            elif "    * " in description:
+                # Sub List
+                sub_list = [s.strip() for s in description.split(" * ")]
+                result += f"   * {sub_list[0]}\n"
+                for sub in sub_list[1:]:
+                    result += f"      * {sub}\n"
+
+            else:
+                # General List
+                result += f"   * {description}\n"
+
+        if title in self._descriptions:
+            for key in sorted(self._descriptions[title]):
+                if key.startswith("__") and key.endswith("__"):
+                    continue
+                elif key == "filters":
+                    continue
+
+                # On windows, we get the paths in the wrong style
+                value = self._descriptions[title][key]
+                if isinstance(value, dict):
+                    for k, v in value.items():
+                        if isinstance(v, str) and "\\" in v:
+                            value[k] = str(v).replace("\\", r"/")
+                result += r"   * " + key + r": " + str(value) + r"\n"
+
+        # Command
+        result += "   * Command\n\n"
+        result += "   .. code-block::\n\n"
+        result += f"      ./mach talos-test -a {title}\n\n"
+
+        if self._task_list.get(title, []):
+            result += "   * **Test Task**:\n\n"
+            for platform in sorted(self._task_list[title]):
+                self._task_list[title][platform].sort(key=lambda x: x["test_name"])
+
+                table = TableBuilder(
+                    title=platform,
+                    widths=[30] + [15 for x in BRANCHES],
+                    header_rows=1,
+                    headers=[["Test Name"] + BRANCHES],
+                    indent=3,
+                )
+
+                for task in self._task_list[title][platform]:
+                    values = [task["test_name"]]
+                    values += [
+                        "\u2705"
+                        if match_run_on_projects(x, task["run_on_projects"])
+                        else "\u274C"
+                        for x in BRANCHES
+                    ]
+                    table.add_row(values)
+                result += f"{table.finish_table()}\n"
+
+        return [result]
+
+    def build_suite_section(self, title, content):
+        return self._build_section_with_header(title, content, header_type="H2")
+
+
+class AwsyGatherer(FrameworkGatherer):
+    """
+    Gatherer for the Awsy framework.
+    """
+
+    def _generate_ci_tasks(self):
+        for task_name in self._taskgraph.keys():
+            task = self._taskgraph[task_name]
+
+            if type(task) == dict:
+                awsy_test = task["task"]["extra"].get("suite", [])
+                run_on_projects = task["attributes"]["run_on_projects"]
+            else:
+                awsy_test = task.task["extra"].get("suite", [])
+                run_on_projects = task.attributes["run_on_projects"]
+
+            task_match = self.get_task_match(task_name)
+
+            if "awsy" in awsy_test and task_match:
+                platform = task_match.group(1)
+                test_name = task_match.group(2)
+                item = {"test_name": test_name, "run_on_projects": run_on_projects}
+                self._task_list.setdefault(platform, []).append(item)
+
+    def get_suite_list(self):
+        self._suite_list = {"Awsy tests": ["tp6", "base", "dmd", "tp5"]}
+        return self._suite_list
+
+    def get_test_list(self):
+        self._generate_ci_tasks()
+        return {
+            "Awsy tests": {
+                "tp6": {},
+                "base": {},
+                "dmd": {},
+                "tp5": {},
+            }
+        }
+
+    def build_suite_section(self, title, content):
+        return self._build_section_with_header(
+            title.capitalize(), content, header_type="H4"
+        )
+
+    def build_test_description(self, title, test_description="", suite_name=""):
+        dropdown_suite_name = suite_name.replace(" ", "-")
+        result = f".. dropdown:: {title} ({test_description})\n"
+        result += f"   :class-container: anchor-id-{title}-{dropdown_suite_name}\n\n"
+
+        awsy_data = read_yaml(self._yaml_path)["suites"]["Awsy tests"]
+        if "owner" in awsy_data.keys():
+            result += f"   **Owner**: {awsy_data['owner']}\n\n"
+        result += "   * **Test Task**:\n"
+
+        # tp5 tests are represented by awsy-e10s test names
+        # while the others have their title in test names
+        search_tag = "awsy-e10s" if title == "tp5" else title
+        for platform in sorted(self._task_list.keys()):
+            result += f"      * {platform}\n"
+            for test_dict in sorted(
+                self._task_list[platform], key=lambda d: d["test_name"]
+            ):
+                if search_tag in test_dict["test_name"]:
+                    run_on_project = ": " + (
+                        ", ".join(test_dict["run_on_projects"])
+                        if test_dict["run_on_projects"]
+                        else "None"
+                    )
+                    result += (
+                        f"            * {test_dict['test_name']}{run_on_project}\n"
+                    )
+            result += "\n"
+
+        return [result]
+
+
+class StaticGatherer(FrameworkGatherer):
+    """
+    A noop gatherer for frameworks with static-only documentation.
+    """
+
+    pass
diff --git a/tools/lint/perfdocs/gatherer.py b/tools/lint/perfdocs/gatherer.py
new file mode 100644
index 0000000000..828c2f7f2b
--- /dev/null
+++ b/tools/lint/perfdocs/gatherer.py
@@ -0,0 +1,156 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import os
+import pathlib
+
+from perfdocs.framework_gatherers import (
+    AwsyGatherer,
+    MozperftestGatherer,
+    RaptorGatherer,
+    StaticGatherer,
+    TalosGatherer,
+)
+from perfdocs.logger import PerfDocLogger
+from perfdocs.utils import read_yaml
+
+logger = PerfDocLogger()
+
+# TODO: Implement decorator/searcher to find the classes.
+frameworks = {
+    "raptor": RaptorGatherer,
+    "mozperftest": MozperftestGatherer,
+    "talos": TalosGatherer,
+    "awsy": AwsyGatherer,
+}
+
+# List of file types allowed to be used as static files
+ALLOWED_STATIC_FILETYPES = ("rst", "png")
+
+
+class Gatherer(object):
+    """
+    Gatherer produces the tree of the perfdoc's entries found
+    and can obtain manifest-based test lists. Used by the Verifier.
+    """
+
+    def __init__(self, workspace_dir, taskgraph=None):
+        """
+        Initialzie the Gatherer.
+
+        :param str workspace_dir: Path to the gecko checkout.
+        """
+        self.workspace_dir = workspace_dir
+        self.taskgraph = taskgraph
+        self._perfdocs_tree = []
+        self._test_list = []
+        self.framework_gatherers = {}
+
+    @property
+    def perfdocs_tree(self):
+        """
+        Returns the perfdocs_tree, and computes it
+        if it doesn't exist.
+
+        :return dict: The perfdocs tree containing all
+            framework perfdoc entries. See `fetch_perfdocs_tree`
+            for information on the data structure.
+        """
+        if self._perfdocs_tree:
+            return self._perfdocs_tree
+        else:
+            self.fetch_perfdocs_tree()
+            return self._perfdocs_tree
+
+    def fetch_perfdocs_tree(self):
+        """
+        Creates the perfdocs tree with the following structure:
+            [
+                {
+                    "path": Path to the perfdocs directory.
+                    "yml": Name of the configuration YAML file.
+                    "rst": Name of the RST file.
+                    "static": Name of the static file.
+                }, ...
+            ]
+
+        This method doesn't return anything. The result can be found in
+        the perfdocs_tree attribute.
+        """
+        exclude_dir = [
+            str(pathlib.Path(self.workspace_dir, ".hg")),
+            str(pathlib.Path("tools", "lint")),
+            str(pathlib.Path("testing", "perfdocs")),
+        ]
+
+        for path in pathlib.Path(self.workspace_dir).rglob("perfdocs"):
+            if any(d in str(path.resolve()) for d in exclude_dir):
+                continue
+            files = [f for f in os.listdir(path)]
+            matched = {"path": str(path), "yml": "", "rst": "", "static": []}
+
+            for file in files:
+                # Add the yml/rst/static file to its key if re finds the searched file
+                if file == "config.yml" or file == "config.yaml":
+                    matched["yml"] = file
+                elif file == "index.rst":
+                    matched["rst"] = file
+                elif file.split(".")[-1] in ALLOWED_STATIC_FILETYPES:
+                    matched["static"].append(file)
+
+            # Append to structdocs if all the searched files were found
+            if all(val for val in matched.values() if not type(val) == list):
+                self._perfdocs_tree.append(matched)
+
+        logger.log(
+            "Found {} perfdocs directories in {}".format(
+                len(self._perfdocs_tree),
+                [d["path"] for d in self._perfdocs_tree],
+            )
+        )
+
+    def get_test_list(self, sdt_entry):
+        """
+        Use a perfdocs_tree entry to find the test list for
+        the framework that was found.
+
+        :return: A framework info dictionary with fields: {
+            'yml_path': Path to YAML,
+            'yml_content': Content of YAML,
+            'name': Name of framework,
+            'test_list': Test list found for the framework
+        }
+        """
+
+        # If it was computed before, return it
+        yaml_path = pathlib.Path(sdt_entry["path"], sdt_entry["yml"])
+        for entry in self._test_list:
+            if entry["yml_path"] == yaml_path:
+                return entry
+
+        # Set up framework entry with meta data
+        yaml_content = read_yaml(yaml_path)
+        framework = {
+            "yml_content": yaml_content,
+            "yml_path": yaml_path,
+            "name": yaml_content["name"],
+            "test_list": {},
+        }
+
+        if yaml_content["static-only"]:
+            framework_gatherer_cls = StaticGatherer
+        else:
+            framework_gatherer_cls = frameworks[framework["name"]]
+
+        # Get and then store the frameworks tests
+        framework_gatherer = self.framework_gatherers[
+            framework["name"]
+        ] = framework_gatherer_cls(
+            framework["yml_path"], self.workspace_dir, self.taskgraph
+        )
+
+        if not yaml_content["static-only"]:
+            framework["test_list"] = framework_gatherer.get_test_list()
+
+        self._test_list.append(framework)
+        return framework
diff --git a/tools/lint/perfdocs/generator.py b/tools/lint/perfdocs/generator.py
new file mode 100644
index 0000000000..3f3a0acefa
--- /dev/null
+++ b/tools/lint/perfdocs/generator.py
@@ -0,0 +1,281 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import pathlib
+import re
+import shutil
+import tempfile
+
+from perfdocs.logger import PerfDocLogger
+from perfdocs.utils import (
+    ON_TRY,
+    are_dirs_equal,
+    get_changed_files,
+    read_file,
+    read_yaml,
+    save_file,
+)
+
+logger = PerfDocLogger()
+
+
+class Generator(object):
+    """
+    After each perfdocs directory was validated, the generator uses the templates
+    for each framework, fills them with the test descriptions in config and saves
+    the perfdocs in the form index.rst as index file and suite_name.rst for
+    each suite of tests in the framework.
+    """
+
+    def __init__(self, verifier, workspace, generate=False):
+        """
+        Initialize the Generator.
+
+        :param verifier: Verifier object. It should not be a fresh Verifier object,
+        but an initialized one with validate_tree() method already called
+        :param workspace: Path to the top-level checkout directory.
+        :param generate: Flag for generating the documentation
+        """
+        self._workspace = workspace
+        if not self._workspace:
+            raise Exception("PerfDocs Generator requires a workspace directory.")
+        # Template documents without added information reside here
+        self.templates_path = pathlib.Path(
+            self._workspace, "tools", "lint", "perfdocs", "templates"
+        )
+        self.perfdocs_path = pathlib.Path(
+            self._workspace, "testing", "perfdocs", "generated"
+        )
+
+        self._generate = generate
+        self._verifier = verifier
+        self._perfdocs_tree = self._verifier._gatherer.perfdocs_tree
+
+    def build_perfdocs_from_tree(self):
+        """
+        Builds up a document for each framework that was found.
+
+        :return dict: A dictionary containing a mapping from each framework
+            to the document that was built for it, i.e:
+            {
+                framework_name: framework_document,
+                ...
+            }
+        """
+
+        # Using the verified `perfdocs_tree`, build up the documentation.
+        frameworks_info = {}
+        for framework in self._perfdocs_tree:
+            yaml_content = read_yaml(pathlib.Path(framework["path"], framework["yml"]))
+            rst_content = read_file(
+                pathlib.Path(framework["path"], framework["rst"]), stringify=True
+            )
+
+            # Gather all tests and descriptions and format them into
+            # documentation content
+            documentation = []
+            suites = yaml_content["suites"]
+            for suite_name in sorted(suites.keys()):
+                suite_info = suites[suite_name]
+
+                # Add the suite section
+                documentation.extend(
+                    self._verifier._gatherer.framework_gatherers[
+                        yaml_content["name"]
+                    ].build_suite_section(suite_name, suite_info["description"])
+                )
+
+                tests = suite_info.get("tests", {})
+                for test_name in sorted(tests.keys()):
+                    gatherer = self._verifier._gatherer.framework_gatherers[
+                        yaml_content["name"]
+                    ]
+                    test_description = gatherer.build_test_description(
+                        test_name, tests[test_name], suite_name
+                    )
+                    documentation.extend(test_description)
+                documentation.append("")
+
+            # Insert documentation into `.rst` file
+            framework_rst = re.sub(
+                r"{documentation}", "\n".join(documentation), rst_content
+            )
+            frameworks_info[yaml_content["name"]] = {
+                "dynamic": framework_rst,
+                "static": [],
+            }
+
+            # For static `.rst` file
+            for static_file in framework["static"]:
+                if static_file.endswith("rst"):
+                    frameworks_info[yaml_content["name"]]["static"].append(
+                        {
+                            "file": static_file,
+                            "content": read_file(
+                                pathlib.Path(framework["path"], static_file),
+                                stringify=True,
+                            ),
+                        }
+                    )
+                else:
+                    frameworks_info[yaml_content["name"]]["static"].append(
+                        {
+                            "file": static_file,
+                            "content": pathlib.Path(framework["path"], static_file),
+                        }
+                    )
+
+        return frameworks_info
+
+    def _create_temp_dir(self):
+        """
+        Create a temp directory as preparation of saving the documentation tree.
+        :return: str the location of perfdocs_tmpdir
+        """
+        # Build the directory that will contain the final result (a tmp dir
+        # that will be moved to the final location afterwards)
+        try:
+            tmpdir = pathlib.Path(tempfile.mkdtemp())
+            perfdocs_tmpdir = pathlib.Path(tmpdir, "generated")
+            perfdocs_tmpdir.mkdir(parents=True, exist_ok=True)
+            perfdocs_tmpdir.chmod(0o766)
+        except OSError as e:
+            logger.critical("Error creating temp file: {}".format(e))
+
+        if perfdocs_tmpdir.is_dir():
+            return perfdocs_tmpdir
+        return False
+
+    def _create_perfdocs(self):
+        """
+        Creates the perfdocs documentation.
+        :return: str path of the temp dir it is saved in
+        """
+        # All directories that are kept in the perfdocs tree are valid,
+        # so use it to build up the documentation.
+        framework_docs = self.build_perfdocs_from_tree()
+        perfdocs_tmpdir = self._create_temp_dir()
+
+        # Save the documentation files
+        frameworks = []
+        for framework_name in sorted(framework_docs.keys()):
+            frameworks.append(framework_name)
+            save_file(
+                framework_docs[framework_name]["dynamic"],
+                pathlib.Path(perfdocs_tmpdir, framework_name),
+            )
+
+            for static_name in framework_docs[framework_name]["static"]:
+                if static_name["file"].endswith(".rst"):
+                    # XXX Replace this with a shutil.copy call (like below)
+                    save_file(
+                        static_name["content"],
+                        pathlib.Path(
+                            perfdocs_tmpdir, static_name["file"].split(".")[0]
+                        ),
+                    )
+                else:
+                    shutil.copy(
+                        static_name["content"],
+                        pathlib.Path(perfdocs_tmpdir, static_name["file"]),
+                    )
+
+        # Get the main page and add the framework links to it
+        mainpage = read_file(
+            pathlib.Path(self.templates_path, "index.rst"), stringify=True
+        )
+
+        fmt_frameworks = "\n".join(["  * :doc:`%s`" % name for name in frameworks])
+        fmt_toctree = "\n".join(["  %s" % name for name in frameworks])
+
+        fmt_mainpage = re.sub(r"{toctree_documentation}", fmt_toctree, mainpage)
+        fmt_mainpage = re.sub(r"{test_documentation}", fmt_frameworks, fmt_mainpage)
+
+        save_file(fmt_mainpage, pathlib.Path(perfdocs_tmpdir, "index"))
+
+        return perfdocs_tmpdir
+
+    def _save_perfdocs(self, perfdocs_tmpdir):
+        """
+        Copies the perfdocs tree after it was saved into the perfdocs_tmpdir
+        :param perfdocs_tmpdir: str location of the temp dir where the
+        perfdocs was saved
+        """
+        # Remove the old docs and copy the new version there without
+        # checking if they need to be regenerated.
+        logger.log("Regenerating perfdocs...")
+
+        if self.perfdocs_path.exists():
+            shutil.rmtree(str(self.perfdocs_path))
+
+        try:
+            saved = shutil.copytree(str(perfdocs_tmpdir), str(self.perfdocs_path))
+            if saved:
+                logger.log(
+                    "Documentation saved to {}/".format(
+                        re.sub(".*testing", "testing", str(self.perfdocs_path))
+                    )
+                )
+        except Exception as e:
+            logger.critical(
+                "There was an error while saving the documentation: {}".format(e)
+            )
+
+    def generate_perfdocs(self):
+        """
+        Generate the performance documentation.
+
+        If `self._generate` is True, then the documentation will be regenerated
+        without any checks. Otherwise, if it is False, the new documentation will be
+        prepare and compare with the existing documentation to determine if
+        it should be regenerated.
+
+        :return bool: True/False - For True, if `self._generate` is True, then the
+            docs were regenerated. If `self._generate` is False, then True will mean
+            that the docs should be regenerated, and False means that they do not
+            need to be regenerated.
+        """
+
+        def get_possibly_changed_files():
+            """
+            Returns files that might have been modified
+            (used to output a linter warning for regeneration)
+            :return: list - files that might have been modified
+            """
+            # Returns files that might have been modified
+            # (used to output a linter warning for regeneration)
+            files = []
+            for entry in self._perfdocs_tree:
+                files.extend(
+                    [
+                        pathlib.Path(entry["path"], entry["yml"]),
+                        pathlib.Path(entry["path"], entry["rst"]),
+                    ]
+                )
+            return files
+
+        # Throw a warning if there's no need for generating
+        if not self.perfdocs_path.exists() and not self._generate:
+            # If they don't exist and we are not generating, then throw
+            # a linting error and exit.
+            logger.warning(
+                "PerfDocs need to be regenerated.", files=get_possibly_changed_files()
+            )
+            return True
+
+        perfdocs_tmpdir = self._create_perfdocs()
+        if self._generate:
+            self._save_perfdocs(perfdocs_tmpdir)
+        else:
+            # If we are not generating, then at least check if they
+            # should be regenerated by comparing the directories.
+            if not are_dirs_equal(perfdocs_tmpdir, self.perfdocs_path):
+                logger.warning(
+                    "PerfDocs are outdated, run ./mach lint -l perfdocs --fix .` "
+                    + "to update them. You can also apply the "
+                    + f"{'perfdocs.diff' if ON_TRY else 'diff.txt'} patch file "
+                    + f"{'produced from this reviewbot test ' if ON_TRY else ''}"
+                    + "to fix the issue.",
+                    files=get_changed_files(self._workspace),
+                    restricted=False,
+                )
diff --git a/tools/lint/perfdocs/logger.py b/tools/lint/perfdocs/logger.py
new file mode 100644
index 0000000000..6f0a482d15
--- /dev/null
+++ b/tools/lint/perfdocs/logger.py
@@ -0,0 +1,81 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import pathlib
+
+
+class PerfDocLogger(object):
+    """
+    Logger for the PerfDoc tooling. Handles the warnings by outputting
+    them into through the StructuredLogger provided by lint.
+    """
+
+    TOP_DIR = ""
+    PATHS = []
+    LOGGER = None
+    FAILED = False
+
+    def __init__(self):
+        """Initializes the PerfDocLogger."""
+
+        # Set up class attributes for all logger instances
+        if not PerfDocLogger.LOGGER:
+            raise Exception(
+                "Missing linting LOGGER instance for PerfDocLogger initialization"
+            )
+        if not PerfDocLogger.PATHS:
+            raise Exception("Missing PATHS for PerfDocLogger initialization")
+        self.logger = PerfDocLogger.LOGGER
+
+    def log(self, msg):
+        """
+        Log an info message.
+
+        :param str msg: Message to log.
+        """
+        self.logger.info(msg)
+
+    def warning(self, msg, files, restricted=True):
+        """
+        Logs a validation warning message. The warning message is
+        used as the error message that is output in the reviewbot.
+
+        :param str msg: Message to log, it's also used as the error message
+            for the issue that is output by the reviewbot.
+        :param list/str files: The file(s) that this warning is about.
+        :param boolean restricted: If the param is False, the lint error can be used anywhere.
+        """
+        if type(files) != list:
+            files = [files]
+
+        # Add a reviewbot error for each file that is given
+        for file in files:
+            # Get a relative path (reviewbot can't handle absolute paths)
+            fpath = str(file).replace(str(PerfDocLogger.TOP_DIR), "")
+
+            # Filter out any issues that do not relate to the paths
+            # that are being linted
+            for path in PerfDocLogger.PATHS:
+                if restricted and str(path) not in str(file):
+                    continue
+
+                # Output error entry
+                self.logger.lint_error(
+                    message=msg,
+                    lineno=0,
+                    column=None,
+                    path=str(pathlib.PurePosixPath(fpath)),
+                    linter="perfdocs",
+                    rule="Flawless performance docs.",
+                )
+
+                PerfDocLogger.FAILED = True
+                break
+
+    def critical(self, msg):
+        """
+        Log a critical message.
+
+        :param str msg: Message to log.
+        """
+        self.logger.critical(msg)
diff --git a/tools/lint/perfdocs/perfdocs.py b/tools/lint/perfdocs/perfdocs.py
new file mode 100644
index 0000000000..b41edb1979
--- /dev/null
+++ b/tools/lint/perfdocs/perfdocs.py
@@ -0,0 +1,95 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import os
+import pathlib
+
+
+def run_perfdocs(config, logger=None, paths=None, generate=True):
+    """
+    Build up performance testing documentation dynamically by combining
+    text data from YAML files that reside in `perfdoc` folders
+    across the `testing` directory. Each directory is expected to have
+    an `index.rst` file along with `config.yml` YAMLs defining what needs
+    to be added to the documentation.
+
+    The YAML must also define the name of the "framework" that should be
+    used in the main index.rst for the performance testing documentation.
+
+    The testing documentation list will be ordered alphabetically once
+    it's produced (to avoid unwanted shifts because of unordered dicts
+    and path searching).
+
+    Note that the suite name headings will be given the H4 (---) style so it
+    is suggested that you use H3 (===) style as the heading for your
+    test section. H5 will be used be used for individual tests within each
+    suite.
+
+    Usage for verification: "./mach lint -l perfdocs ."
+    Usage for generation: "./mach lint -l perfdocs --fix ."
+
+    For validation, see the Verifier class for a description of how
+    it works.
+
+    The run will fail if the valid result from validate_tree is not
+    False, implying some warning/problem was logged.
+
+    :param dict config: The configuration given by mozlint.
+    :param StructuredLogger logger: The StructuredLogger instance to be used to
+        output the linting warnings/errors.
+    :param list paths: The paths that are being tested. Used to filter
+        out errors from files outside of these paths.
+    :param bool generate: If true, the docs will be (re)generated.
+    """
+    from perfdocs.logger import PerfDocLogger
+
+    if not os.environ.get("WORKSPACE", None):
+        floc = pathlib.Path(__file__).absolute()
+        top_dir = pathlib.Path(str(floc).split("tools")[0]).resolve()
+    else:
+        top_dir = pathlib.Path(os.environ.get("WORKSPACE")).resolve()
+
+    PerfDocLogger.LOGGER = logger
+    PerfDocLogger.TOP_DIR = top_dir
+
+    # Convert all the paths to relative ones
+    target_dir = [pathlib.Path(path) for path in paths]
+    rel_paths = []
+    for path in target_dir:
+        try:
+            rel_paths.append(path.relative_to(top_dir))
+        except ValueError:
+            rel_paths.append(path)
+
+    PerfDocLogger.PATHS = rel_paths
+
+    for path in target_dir:
+        if not path.exists():
+            raise Exception("Cannot locate directory at %s" % str(path))
+
+    decision_task_id = os.environ.get("DECISION_TASK_ID", None)
+    if decision_task_id:
+        from taskgraph.util.taskcluster import get_artifact
+
+        task_graph = get_artifact(decision_task_id, "public/full-task-graph.json")
+    else:
+        from tryselect.tasks import generate_tasks
+
+        task_graph = generate_tasks(
+            params=None, full=True, disable_target_task_filter=True
+        ).tasks
+
+    # Late import because logger isn't defined until later
+    from perfdocs.generator import Generator
+    from perfdocs.verifier import Verifier
+
+    # Run the verifier first
+    verifier = Verifier(top_dir, task_graph)
+    verifier.validate_tree()
+
+    if not PerfDocLogger.FAILED:
+        # Even if the tree is valid, we need to check if the documentation
+        # needs to be regenerated, and if it does, we throw a linting error.
+        # `generate` dictates whether or not the documentation is generated.
+        generator = Generator(verifier, generate=generate, workspace=top_dir)
+        generator.generate_perfdocs()
diff --git a/tools/lint/perfdocs/templates/index.rst b/tools/lint/perfdocs/templates/index.rst
new file mode 100644
index 0000000000..5e684fef7d
--- /dev/null
+++ b/tools/lint/perfdocs/templates/index.rst
@@ -0,0 +1,86 @@
+###################
+Performance Testing
+###################
+
+.. toctree::
+  :maxdepth: 2
+  :hidden:
+  :glob:
+
+{toctree_documentation}
+
+Performance tests are designed to catch performance regressions before they reach our
+end users. At this time, there is no unified approach for these types of tests,
+but `mozperftest </testing/perfdocs/mozperftest.html>`_ aims to provide this in the future.
+
+For more detailed information about each test suite and project, see their documentation:
+
+{test_documentation}
+
+
+Here are the active PerfTest components/modules and their respective owners:
+
+    * AWFY (Are We Fast Yet) -
+        - Owner: Beatrice A.
+        - Description: A public dashboard comparing Firefox and Chrome performance metrics
+    * AWSY (Are We Slim Yet)
+        - Owner: Alexandru I.
+        - Description: Project that tracks memory usage across builds
+    * Raptor
+        - Owner: Sparky
+        - Co-owner: Kash
+        - Description: Test harness that uses Browsertime (based on webdriver) as the underlying engine to run performance tests
+    * CondProf (Conditioned profiles)
+        - Owner: Sparky
+        - Co-owner: Jmaher
+        - Description: Provides tooling to build, and obtain profiles that are preconditioned in some way.
+    * fxrecord
+        - Owner: Sparky
+        - Co-owners: Kash, Andrej
+        - Description: Tool for measuring startup performance for Firefox Desktop
+    * Infrastructure
+        - Owner: Sparky
+        - Co-owners: Kash, Andrej
+        - Description: All things involving: TaskCluster, Youtube Playback, Bitbar, Mobile Configs, etc...
+    * Mozperftest
+        - Owner: Sparky
+        - Co-owners: Kash, Andrej
+        - Description: Testing framework used to run performance tests
+    * Mozperftest Tools
+        - Owner: Sparky
+        - Co-owner: Alexandru I.
+        - Description: Various tools used by performance testing team
+    * Mozproxy
+        - Owner:  Sparky
+        - Co-owner: Kash
+        - Description: An http proxy used to run tests against third-party websites in a reliable and reproducible way
+    * PerfCompare
+        - Owner: Kimberly
+        - Co-owner: Beatrice A.
+        - Description: Performance comparison tool used to compare performance of different commits within a repository
+    * PerfDocs
+        - Owner: Sparky
+        - Co-owner: Alexandru I.
+        - Description: Automatically generated performance test engineering documentation
+    * PerfHerder
+        - Owner: Beatrice A
+        - Co-owner: Andra A.
+        - Description: The framework used by the performance sheriffs to find performance regressions and for storing, and visualizing our performance data.
+    * Performance Sheriffing
+        - Owner: Alexandru I.
+        - Co-owner: Andra A.
+        - Description: Performance sheriffs are responsible for finding commits that cause performance regressions and getting fixes from devs or backing out the changes
+    * Talos
+        - Owner: Sparky
+        - Co-owner: Andrej
+        - Description: Testing framework used to run Firefox-specific performance tests
+    * WebPageTest
+        - Owner: Andrej
+        - Co-owner: Sparky
+        - Description: A test running in the mozperftest framework used as a third party performance benchmark
+
+You can additionally reach out to our team on
+the `#perftest <https://matrix.to/#/#perftest:mozilla.org>`_ channel on matrix
+
+For more information about the performance testing team,
+`visit the wiki page <https://wiki.mozilla.org/TestEngineering/Performance>`_.
diff --git a/tools/lint/perfdocs/utils.py b/tools/lint/perfdocs/utils.py
new file mode 100644
index 0000000000..1ba7daeb52
--- /dev/null
+++ b/tools/lint/perfdocs/utils.py
@@ -0,0 +1,157 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import difflib
+import filecmp
+import os
+import pathlib
+
+import yaml
+from mozversioncontrol import get_repository_object
+
+from perfdocs.logger import PerfDocLogger
+
+logger = PerfDocLogger()
+
+ON_TRY = "MOZ_AUTOMATION" in os.environ
+
+
+def save_file(file_content, path, extension="rst"):
+    """
+    Saves data into a file.
+
+    :param str path: Location and name of the file being saved
+        (without an extension).
+    :param str data: Content to write into the file.
+    :param str extension: Extension to save the file as.
+    """
+    new_file = pathlib.Path("{}.{}".format(str(path), extension))
+    with new_file.open("wb") as f:
+        f.write(file_content.encode("utf-8"))
+
+
+def read_file(path, stringify=False):
+    """
+    Opens a file and returns its contents.
+
+    :param str path: Path to the file.
+    :return list: List containing the lines in the file.
+    """
+    with path.open(encoding="utf-8") as f:
+        return f.read() if stringify else f.readlines()
+
+
+def read_yaml(yaml_path):
+    """
+    Opens a YAML file and returns the contents.
+
+    :param str yaml_path: Path to the YAML to open.
+    :return dict: Dictionary containing the YAML content.
+    """
+    contents = {}
+    try:
+        with yaml_path.open(encoding="utf-8") as f:
+            contents = yaml.safe_load(f)
+    except Exception as e:
+        logger.warning(
+            "Error opening file {}: {}".format(str(yaml_path), str(e)), str(yaml_path)
+        )
+
+    return contents
+
+
+def are_dirs_equal(dir_1, dir_2):
+    """
+    Compare two directories to see if they are equal. Files in each
+    directory are assumed to be equal if their names and contents
+    are equal.
+
+    :param dir_1: First directory path
+    :param dir_2: Second directory path
+    :return: True if the directory trees are the same and False otherwise.
+    """
+
+    dirs_cmp = filecmp.dircmp(str(dir_1.resolve()), str(dir_2.resolve()))
+    if dirs_cmp.left_only or dirs_cmp.right_only or dirs_cmp.funny_files:
+        logger.log("Some files are missing or are funny.")
+        for file in dirs_cmp.left_only:
+            logger.log(f"Missing in existing docs: {file}")
+        for file in dirs_cmp.right_only:
+            logger.log(f"Missing in new docs: {file}")
+        for file in dirs_cmp.funny_files:
+            logger.log(f"The following file is funny: {file}")
+        return False
+
+    _, mismatch, errors = filecmp.cmpfiles(
+        str(dir_1.resolve()), str(dir_2.resolve()), dirs_cmp.common_files, shallow=False
+    )
+
+    if mismatch or errors:
+        logger.log(f"Found mismatches: {mismatch}")
+
+        # The root for where to save the diff will be different based on
+        # whether we are running in CI or not
+        os_root = pathlib.Path.cwd().anchor
+        diff_root = pathlib.Path(os_root, "builds", "worker")
+        if not ON_TRY:
+            diff_root = pathlib.Path(PerfDocLogger.TOP_DIR, "artifacts")
+            diff_root.mkdir(parents=True, exist_ok=True)
+
+        diff_path = pathlib.Path(diff_root, "diff.txt")
+        with diff_path.open("w", encoding="utf-8") as diff_file:
+            for entry in mismatch:
+                logger.log(f"Mismatch found on {entry}")
+
+                with pathlib.Path(dir_1, entry).open(encoding="utf-8") as f:
+                    newlines = f.readlines()
+                with pathlib.Path(dir_2, entry).open(encoding="utf-8") as f:
+                    baselines = f.readlines()
+                for line in difflib.unified_diff(
+                    baselines, newlines, fromfile="base", tofile="new"
+                ):
+                    logger.log(line)
+
+                # Here we want to add to diff.txt in a patch format, we use
+                # the basedir to make the file names/paths relative and this is
+                # different in CI vs local runs.
+                basedir = pathlib.Path(
+                    os_root, "builds", "worker", "checkouts", "gecko"
+                )
+                if not ON_TRY:
+                    basedir = diff_root
+
+                relative_path = str(pathlib.Path(dir_2, entry)).split(str(basedir))[-1]
+                patch = difflib.unified_diff(
+                    baselines, newlines, fromfile=relative_path, tofile=relative_path
+                )
+
+                write_header = True
+                for line in patch:
+                    if write_header:
+                        diff_file.write(
+                            f"diff --git a/{relative_path} b/{relative_path}\n"
+                        )
+                        write_header = False
+                    diff_file.write(line)
+
+                logger.log(f"Completed diff on {entry}")
+
+        logger.log(f"Saved diff to {diff_path}")
+
+        return False
+
+    for common_dir in dirs_cmp.common_dirs:
+        subdir_1 = pathlib.Path(dir_1, common_dir)
+        subdir_2 = pathlib.Path(dir_2, common_dir)
+        if not are_dirs_equal(subdir_1, subdir_2):
+            return False
+
+    return True
+
+
+def get_changed_files(top_dir):
+    """
+    Returns the changed files found with duplicates removed.
+    """
+    repo = get_repository_object(top_dir)
+    return list(set(repo.get_changed_files() + repo.get_outgoing_files()))
diff --git a/tools/lint/perfdocs/verifier.py b/tools/lint/perfdocs/verifier.py
new file mode 100644
index 0000000000..1911210a78
--- /dev/null
+++ b/tools/lint/perfdocs/verifier.py
@@ -0,0 +1,601 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import os
+import pathlib
+import re
+
+import jsonschema
+
+from perfdocs.gatherer import Gatherer
+from perfdocs.logger import PerfDocLogger
+from perfdocs.utils import read_file, read_yaml
+
+logger = PerfDocLogger()
+
+"""
+Schema for the config.yml file.
+Expecting a YAML file with a format such as this:
+
+name: raptor
+manifest: testing/raptor/raptor/raptor.ini
+static-only: False
+suites:
+    desktop:
+        description: "Desktop tests."
+        tests:
+            raptor-tp6: "Raptor TP6 tests."
+    mobile:
+        description: "Mobile tests"
+    benchmarks:
+        description: "Benchmark tests."
+        tests:
+            wasm: "All wasm tests."
+
+"""
+CONFIG_SCHEMA = {
+    "definitions": {
+        "metrics_schema": {
+            "metric_name": {
+                "type": "object",
+                "properties": {
+                    "aliases": {"type": "array", "items": {"type": "string"}},
+                    "description": {"type": "string"},
+                    "matcher": {"type": "string"},
+                },
+                "required": ["description", "aliases"],
+            },
+        },
+    },
+    "type": "object",
+    "properties": {
+        "name": {"type": "string"},
+        "manifest": {"type": "string"},
+        "static-only": {"type": "boolean"},
+        "metrics": {"$ref": "#/definitions/metrics_schema"},
+        "suites": {
+            "type": "object",
+            "properties": {
+                "suite_name": {
+                    "type": "object",
+                    "properties": {
+                        "tests": {
+                            "type": "object",
+                            "properties": {
+                                "test_name": {"type": "string"},
+                                "metrics": {"$ref": "#/definitions/metrics_schema"},
+                            },
+                        },
+                        "description": {"type": "string"},
+                        "owner": {"type": "string"},
+                        "metrics": {"$ref": "#/definitions/metrics_schema"},
+                    },
+                    "required": ["description"],
+                }
+            },
+        },
+    },
+    "required": ["name", "manifest", "static-only", "suites"],
+}
+
+
+class Verifier(object):
+    """
+    Verifier is used for validating the perfdocs folders/tree. In the future,
+    the generator will make use of this class to obtain a validated set of
+    descriptions that can be used to build up a document.
+    """
+
+    def __init__(self, workspace_dir, taskgraph=None):
+        """
+        Initialize the Verifier.
+
+        :param str workspace_dir: Path to the top-level checkout directory.
+        """
+        self.workspace_dir = workspace_dir
+        self._gatherer = Gatherer(workspace_dir, taskgraph)
+        self._compiled_matchers = {}
+
+    def _is_yaml_test_match(
+        self, target_test_name, test_name, suite="", global_descriptions={}
+    ):
+        """Determine if a target name (from a YAML) matches with a test."""
+        tb = os.path.basename(target_test_name)
+        tb = re.sub("\..*", "", tb)
+        if test_name == tb:
+            # Found an exact match for the test_name
+            return True
+        if test_name in tb:
+            # Found a 'fuzzy' match for the test_name
+            # i.e. 'wasm' could exist for all raptor wasm tests
+            global_descriptions.setdefault(suite, []).append(test_name)
+            return True
+
+    def _validate_desc_yaml_direction(
+        self, suite, framework_info, yaml_content, global_descriptions
+    ):
+        """Validate the descriptions in the YAML.
+
+        This validation ensures that all tests defined in the YAML exist in the test
+        harness. Failures here suggest that there's a typo in the YAML or that
+        a test was removed.
+        """
+        ytests = yaml_content["suites"][suite]
+        global_descriptions[suite] = []
+        if not ytests.get("tests"):
+            # It's possible a suite entry has no tests
+            return True
+
+        # Suite found - now check if any tests in YAML
+        # definitions don't exist
+        ytests = ytests["tests"]
+        for test_name in ytests:
+            foundtest = False
+            for t in framework_info["test_list"][suite]:
+                if self._is_yaml_test_match(
+                    t, test_name, suite=suite, global_descriptions=global_descriptions
+                ):
+                    foundtest = True
+                    break
+            if not foundtest:
+                logger.warning(
+                    "Could not find an existing test for {} - bad test name?".format(
+                        test_name
+                    ),
+                    framework_info["yml_path"],
+                )
+                return False
+
+    def _validate_desc_harness_direction(
+        self, suite, test_list, yaml_content, global_descriptions
+    ):
+        """Validate that the tests have a description in the YAML.
+
+        This stage of validation ensures that all the tests have some
+        form of description, or that global descriptions are available.
+        Failures here suggest a new test was added, or the config.yml
+        file was changed.
+        """
+        # If only a description is provided for the suite, assume
+        # that this is a suite-wide description and don't check for
+        # it's tests
+        stests = yaml_content["suites"][suite].get("tests", None)
+        if not stests:
+            return
+
+        tests_found = 0
+        missing_tests = []
+        test_to_manifest = {}
+        for test_name, test_info in test_list.items():
+            manifest_path = test_info.get("path", test_info.get("manifest", ""))
+            tb = os.path.basename(manifest_path)
+            tb = re.sub("\..*", "", tb)
+            if (
+                stests.get(tb, None) is not None
+                or stests.get(test_name, None) is not None
+            ):
+                # Test description exists, continue with the next test
+                tests_found += 1
+                continue
+            test_to_manifest[test_name] = manifest_path
+            missing_tests.append(test_name)
+
+        # Check if global test descriptions exist (i.e.
+        # ones that cover all of tp6) for the missing tests
+        new_mtests = []
+        for mt in missing_tests:
+            found = False
+            for test_name in global_descriptions[suite]:
+                # Global test exists for this missing test
+                if mt.startswith(test_name):
+                    found = True
+                    break
+                if test_name in mt:
+                    found = True
+                    break
+            if not found:
+                new_mtests.append(mt)
+
+        if len(new_mtests):
+            # Output an error for each manifest with a missing
+            # test description
+            for test_name in new_mtests:
+                logger.warning(
+                    "Could not find a test description for {}".format(test_name),
+                    test_to_manifest[test_name],
+                )
+
+    def _match_metrics(self, target_metric_name, target_metric_info, measured_metrics):
+        """Find all metrics that match the given information.
+
+        It either checks for the metric through a direct equality check, and if
+        a regex matcher was provided, we will use that afterwards.
+        """
+        verified_metrics = []
+
+        metric_names = target_metric_info["aliases"] + [target_metric_name]
+        for measured_metric in measured_metrics:
+            if measured_metric in metric_names:
+                verified_metrics.append(measured_metric)
+
+        if target_metric_info.get("matcher", ""):
+            # Compile the regex separately to capture issues in the regex
+            # compilation
+            matcher = self._compiled_matchers.get(target_metric_name, None)
+            if not matcher:
+                matcher = re.compile(target_metric_info.get("matcher"))
+                self._compiled_matchers[target_metric_name] = matcher
+
+            # Search the measured metrics
+            for measured_metric in measured_metrics:
+                if matcher.search(measured_metric):
+                    verified_metrics.append(measured_metric)
+
+        return verified_metrics
+
+    def _validate_metrics_yaml_direction(
+        self, suite, framework_info, yaml_content, global_metrics
+    ):
+        """Validate the metric descriptions in the YAML.
+
+        This direction (`yaml_direction`) checks that the YAML definitions exist in
+        the test harness as real metrics. Failures here suggest that a metric
+        changed name, is missing an alias, is misnamed, duplicated, or was removed.
+        """
+        yaml_suite = yaml_content["suites"][suite]
+        suite_metrics = yaml_suite.get("metrics", {})
+
+        # Check to make sure all the metrics with given descriptions
+        # are actually being measured. Add the metric to the "verified" field in
+        # global_metrics to use it later for "global" metrics that can
+        # have their descriptions removed. Start from the test level.
+        for test_name, test_info in yaml_suite.get("tests", {}).items():
+            if not isinstance(test_info, dict):
+                continue
+            test_metrics_info = test_info.get("metrics", {})
+
+            # Find all tests that match with this name in case they measure
+            # different things
+            measured_metrics = []
+            for t in framework_info["test_list"][suite]:
+                if not self._is_yaml_test_match(t, test_name):
+                    # Check to make sure we are checking against the right
+                    # test. Skip the metric check if we can't find the test.
+                    continue
+                measured_metrics.extend(
+                    framework_info["test_list"][suite][t].get("metrics", [])
+                )
+
+            if len(measured_metrics) == 0:
+                continue
+
+            # Check if all the test metrics documented exist
+            for metric_name, metric_info in test_metrics_info.items():
+                verified_metrics = self._match_metrics(
+                    metric_name, metric_info, measured_metrics
+                )
+                if len(verified_metrics) > 0:
+                    global_metrics["yaml-verified"].extend(
+                        [metric_name] + metric_info["aliases"]
+                    )
+                    global_metrics["verified"].extend(
+                        [metric_name] + metric_info["aliases"] + verified_metrics
+                    )
+                else:
+                    logger.warning(
+                        (
+                            "Cannot find documented metric `{}` "
+                            "being used in the specified test `{}`."
+                        ).format(metric_name, test_name),
+                        framework_info["yml_path"],
+                    )
+
+        # Check the suite level now
+        for suite_metric_name, suite_metric_info in suite_metrics.items():
+            measured_metrics = []
+            for _, test_info in framework_info["test_list"][suite].items():
+                measured_metrics.extend(test_info.get("metrics", []))
+
+            verified_metrics = self._match_metrics(
+                suite_metric_name, suite_metric_info, measured_metrics
+            )
+            if len(verified_metrics) > 0:
+                global_metrics["yaml-verified"].extend(
+                    [suite_metric_name] + suite_metric_info["aliases"]
+                )
+                global_metrics["verified"].extend(
+                    [suite_metric_name]
+                    + suite_metric_info["aliases"]
+                    + verified_metrics
+                )
+            else:
+                logger.warning(
+                    (
+                        "Cannot find documented metric `{}` "
+                        "being used in the specified suite `{}`."
+                    ).format(suite_metric_name, suite),
+                    framework_info["yml_path"],
+                )
+
+        # Finally check the global level (output failures later)
+        all_measured_metrics = []
+        for _, test_info in framework_info["test_list"][suite].items():
+            all_measured_metrics.extend(test_info.get("metrics", []))
+        for global_metric_name, global_metric_info in global_metrics["global"].items():
+            verified_metrics = self._match_metrics(
+                global_metric_name, global_metric_info, all_measured_metrics
+            )
+            if global_metric_info.get("verified", False):
+                # We already verified this global metric, but add any
+                # extra verified metrics here
+                global_metrics["verified"].extend(verified_metrics)
+                continue
+            if len(verified_metrics) > 0:
+                global_metric_info["verified"] = True
+                global_metrics["yaml-verified"].extend(
+                    [global_metric_name] + global_metric_info["aliases"]
+                )
+                global_metrics["verified"].extend(
+                    [global_metric_name]
+                    + global_metric_info["aliases"]
+                    + verified_metrics
+                )
+
+    def _validate_metrics_harness_direction(
+        self, suite, test_list, yaml_content, global_metrics
+    ):
+        """Validate that metrics in the harness are documented."""
+        # Gather all the metrics being measured
+        all_measured_metrics = {}
+        for test_name, test_info in test_list.items():
+            metrics = test_info.get("metrics", [])
+            for metric in metrics:
+                all_measured_metrics.setdefault(metric, []).append(test_name)
+
+        if len(all_measured_metrics) == 0:
+            # There are no metrics measured by this suite
+            return
+
+        for metric, tests in all_measured_metrics.items():
+            if metric not in global_metrics["verified"]:
+                # Log a warning in all files that have this metric
+                for test in tests:
+                    logger.warning(
+                        "Missing description for the metric `{}` in test `{}`".format(
+                            metric, test
+                        ),
+                        test_list[test].get(
+                            "path", test_list[test].get("manifest", "")
+                        ),
+                    )
+
+    def validate_descriptions(self, framework_info):
+        """
+        Cross-validate the tests found in the manifests and the YAML
+        test definitions. This function doesn't return a valid flag. Instead,
+        the StructDocLogger.VALIDATION_LOG is used to determine validity.
+
+        The validation proceeds as follows:
+            1. Check that all tests/suites in the YAML exist in the manifests.
+                - At the same time, build a list of global descriptions which
+                   define descriptions for groupings of tests.
+            2. Check that all tests/suites found in the manifests exist in the YAML.
+                - For missing tests, check if a global description for them exists.
+
+        As the validation is completed, errors are output into the validation log
+        for any issues that are found.
+
+        The same is done for the metrics field expect it also has regex matching,
+        and the definitions cannot be duplicated in a single harness. We make use
+        of two `*verified` fields to simplify the two stages/directions, and checking
+        for any duplication.
+
+        :param dict framework_info: Contains information about the framework. See
+            `Gatherer.get_test_list` for information about its structure.
+        """
+        yaml_content = framework_info["yml_content"]
+
+        # Check for any bad test/suite names in the yaml config file
+        # TODO: Combine global settings into a single dictionary
+        global_descriptions = {}
+        global_metrics = {
+            "global": yaml_content.get("metrics", {}),
+            "verified": [],
+            "yaml-verified": [],
+        }
+        for suite, ytests in yaml_content["suites"].items():
+            # Find the suite, then check against the tests within it
+            if framework_info["test_list"].get(suite, None) is None:
+                logger.warning(
+                    "Could not find an existing suite for {} - bad suite name?".format(
+                        suite
+                    ),
+                    framework_info["yml_path"],
+                )
+                continue
+
+            # Validate descriptions
+            self._validate_desc_yaml_direction(
+                suite, framework_info, yaml_content, global_descriptions
+            )
+
+            # Validate metrics
+            self._validate_metrics_yaml_direction(
+                suite, framework_info, yaml_content, global_metrics
+            )
+
+        # The suite and test levels were properly checked, but we can only
+        # check the global level after all suites were checked. If the metric
+        # isn't in the verified
+        for global_metric_name, _ in global_metrics["global"].items():
+            if global_metric_name not in global_metrics["verified"]:
+                logger.warning(
+                    (
+                        "Cannot find documented metric `{}` "
+                        "being used in the specified harness `{}`."
+                    ).format(global_metric_name, yaml_content["name"]),
+                    framework_info["yml_path"],
+                )
+
+        # Check for duplicate metrics/aliases in the verified metrics
+        unique_metrics = set()
+        warned = set()
+        for metric in global_metrics["yaml-verified"]:
+            if (
+                metric in unique_metrics or unique_metrics.add(metric)
+            ) and metric not in warned:
+                logger.warning(
+                    "Duplicate definitions found for `{}`.".format(metric),
+                    framework_info["yml_path"],
+                )
+                warned.add(metric)
+
+        # Check for duplicate metrics in the global level
+        unique_metrics = set()
+        warned = set()
+        for metric, metric_info in global_metrics["global"].items():
+            if (
+                metric in unique_metrics or unique_metrics.add(metric)
+            ) and metric not in warned:
+                logger.warning(
+                    "Duplicate definitions found for `{}`.".format(metric),
+                    framework_info["yml_path"],
+                )
+                for alias in metric_info.get("aliases", []):
+                    unique_metrics.add(alias)
+                    warned.add(alias)
+                warned.add(metric)
+
+        # Check for any missing tests/suites
+        for suite, test_list in framework_info["test_list"].items():
+            if not yaml_content["suites"].get(suite):
+                # Description doesn't exist for the suite
+                logger.warning(
+                    "Missing suite description for {}".format(suite),
+                    yaml_content["manifest"],
+                )
+                continue
+
+            self._validate_desc_harness_direction(
+                suite, test_list, yaml_content, global_descriptions
+            )
+
+            self._validate_metrics_harness_direction(
+                suite, test_list, yaml_content, global_metrics
+            )
+
+    def validate_yaml(self, yaml_path):
+        """
+        Validate that the YAML file has all the fields that are
+        required and parse the descriptions into strings in case
+        some are give as relative file paths.
+
+        :param str yaml_path: Path to the YAML to validate.
+        :return bool: True/False => Passed/Failed Validation
+        """
+
+        def _get_description(desc):
+            """
+            Recompute the description in case it's a file.
+            """
+            desc_path = pathlib.Path(self.workspace_dir, desc)
+
+            try:
+                if desc_path.exists() and desc_path.is_file():
+                    with open(desc_path, "r") as f:
+                        desc = f.readlines()
+            except OSError:
+                pass
+
+            return desc
+
+        def _parse_descriptions(content):
+            for suite, sinfo in content.items():
+                desc = sinfo["description"]
+                sinfo["description"] = _get_description(desc)
+
+                # It's possible that the suite has no tests and
+                # only a description. If they exist, then parse them.
+                if "tests" in sinfo:
+                    for test, desc in sinfo["tests"].items():
+                        sinfo["tests"][test] = _get_description(desc)
+
+        valid = False
+        yaml_content = read_yaml(yaml_path)
+
+        try:
+            jsonschema.validate(instance=yaml_content, schema=CONFIG_SCHEMA)
+            _parse_descriptions(yaml_content["suites"])
+            valid = True
+        except Exception as e:
+            logger.warning("YAML ValidationError: {}".format(str(e)), yaml_path)
+
+        return valid
+
+    def validate_rst_content(self, rst_path):
+        """
+        Validate that the index file given has a {documentation} entry
+        so that the documentation can be inserted there.
+
+        :param str rst_path: Path to the RST file.
+        :return bool: True/False => Passed/Failed Validation
+        """
+        rst_content = read_file(rst_path)
+
+        # Check for a {documentation} entry in some line,
+        # if we can't find one, then the validation fails.
+        valid = False
+        docs_match = re.compile(".*{documentation}.*")
+        for line in rst_content:
+            if docs_match.search(line):
+                valid = True
+                break
+        if not valid:
+            logger.warning(  # noqa: PLE1205
+                "Cannot find a '{documentation}' entry in the given index file",
+                rst_path,
+            )
+
+        return valid
+
+    def _check_framework_descriptions(self, item):
+        """
+        Helper method for validating descriptions
+        """
+        framework_info = self._gatherer.get_test_list(item)
+        self.validate_descriptions(framework_info)
+
+    def validate_tree(self):
+        """
+        Validate the `perfdocs` directory that was found.
+        Returns True if it is good, false otherwise.
+
+        :return bool: True/False => Passed/Failed Validation
+        """
+        found_good = 0
+
+        # For each framework, check their files and validate descriptions
+        for matched in self._gatherer.perfdocs_tree:
+            # Get the paths to the YAML and RST for this framework
+            matched_yml = pathlib.Path(matched["path"], matched["yml"])
+            matched_rst = pathlib.Path(matched["path"], matched["rst"])
+
+            _valid_files = {
+                "yml": self.validate_yaml(matched_yml),
+                "rst": True,
+            }
+            if not read_yaml(matched_yml)["static-only"]:
+                _valid_files["rst"] = self.validate_rst_content(matched_rst)
+
+            # Log independently the errors found for the matched files
+            for file_format, valid in _valid_files.items():
+                if not valid:
+                    logger.log("File validation error: {}".format(file_format))
+            if not all(_valid_files.values()):
+                continue
+            found_good += 1
+
+            self._check_framework_descriptions(matched)
+
+        if not found_good:
+            raise Exception("No valid perfdocs directories found")
diff --git a/tools/lint/python/__init__.py b/tools/lint/python/__init__.py
new file mode 100644
index 0000000000..c580d191c1
--- /dev/null
+++ b/tools/lint/python/__init__.py
@@ -0,0 +1,3 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
diff --git a/tools/lint/python/black.py b/tools/lint/python/black.py
new file mode 100644
index 0000000000..ac975e62a2
--- /dev/null
+++ b/tools/lint/python/black.py
@@ -0,0 +1,179 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import platform
+import re
+import signal
+import subprocess
+import sys
+
+import mozpack.path as mozpath
+from mozfile import which
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+from mozprocess import ProcessHandler
+
+here = os.path.abspath(os.path.dirname(__file__))
+BLACK_REQUIREMENTS_PATH = os.path.join(here, "black_requirements.txt")
+
+BLACK_INSTALL_ERROR = """
+Unable to install correct version of black
+Try to install it manually with:
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    BLACK_REQUIREMENTS_PATH
+)
+
+
+def default_bindir():
+    # We use sys.prefix to find executables as that gets modified with
+    # virtualenv's activate_this.py, whereas sys.executable doesn't.
+    if platform.system() == "Windows":
+        return os.path.join(sys.prefix, "Scripts")
+    else:
+        return os.path.join(sys.prefix, "bin")
+
+
+def get_black_version(binary):
+    """
+    Returns found binary's version
+    """
+    try:
+        output = subprocess.check_output(
+            [binary, "--version"],
+            stderr=subprocess.STDOUT,
+            universal_newlines=True,
+        )
+    except subprocess.CalledProcessError as e:
+        output = e.output
+    try:
+        # Accept `black.EXE, version ...` on Windows.
+        # for old version of black, the output is
+        # black, version 21.4b2
+        # From black 21.11b1, the output is like
+        # black, 21.11b1 (compiled: no)
+        return re.match(r"black.*,( version)? (\S+)", output)[2]
+    except TypeError as e:
+        print("Could not parse the version '{}'".format(output))
+        print("Error: {}".format(e))
+
+
+def parse_issues(config, output, paths, *, log):
+    would_reformat = re.compile("^would reformat (.*)$", re.I)
+    reformatted = re.compile("^reformatted (.*)$", re.I)
+    cannot_reformat = re.compile("^error: cannot format (.*?): (.*)$", re.I)
+    results = []
+    for line in output:
+        line = line.decode("utf-8")
+        if line.startswith("All done!") or line.startswith("Oh no!"):
+            break
+
+        match = would_reformat.match(line)
+        if match:
+            res = {"path": match.group(1), "level": "error"}
+            results.append(result.from_config(config, **res))
+            continue
+
+        match = reformatted.match(line)
+        if match:
+            res = {"path": match.group(1), "level": "warning", "message": "reformatted"}
+            results.append(result.from_config(config, **res))
+            continue
+
+        match = cannot_reformat.match(line)
+        if match:
+            res = {"path": match.group(1), "level": "error", "message": match.group(2)}
+            results.append(result.from_config(config, **res))
+            continue
+
+        log.debug(f"Unhandled line: {line}")
+    return results
+
+
+class BlackProcess(ProcessHandler):
+    def __init__(self, config, *args, **kwargs):
+        self.config = config
+        kwargs["stream"] = False
+        ProcessHandler.__init__(self, *args, **kwargs)
+
+    def run(self, *args, **kwargs):
+        orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+        ProcessHandler.run(self, *args, **kwargs)
+        signal.signal(signal.SIGINT, orig)
+
+
+def run_process(config, cmd):
+    proc = BlackProcess(config, cmd)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+    return proc.output
+
+
+def setup(root, **lintargs):
+    log = lintargs["log"]
+    virtualenv_bin_path = lintargs.get("virtualenv_bin_path")
+    # Using `which` searches multiple directories and handles `.exe` on Windows.
+    binary = which("black", path=(virtualenv_bin_path, default_bindir()))
+
+    if binary and os.path.exists(binary):
+        binary = mozpath.normsep(binary)
+        log.debug("Looking for black at {}".format(binary))
+        version = get_black_version(binary)
+        versions = [
+            line.split()[0].strip()
+            for line in open(BLACK_REQUIREMENTS_PATH).readlines()
+            if line.startswith("black==")
+        ]
+        if ["black=={}".format(version)] == versions:
+            log.debug("Black is present with expected version {}".format(version))
+            return 0
+        else:
+            log.debug("Black is present but unexpected version {}".format(version))
+
+    log.debug("Black needs to be installed or updated")
+    virtualenv_manager = lintargs["virtualenv_manager"]
+    try:
+        virtualenv_manager.install_pip_requirements(BLACK_REQUIREMENTS_PATH, quiet=True)
+    except subprocess.CalledProcessError:
+        print(BLACK_INSTALL_ERROR)
+        return 1
+
+
+def run_black(config, paths, fix=None, *, log, virtualenv_bin_path):
+    fixed = 0
+    binary = os.path.join(virtualenv_bin_path or default_bindir(), "black")
+
+    log.debug("Black version {}".format(get_black_version(binary)))
+
+    cmd_args = [binary]
+    if not fix:
+        cmd_args.append("--check")
+
+    base_command = cmd_args + paths
+    log.debug("Command: {}".format(" ".join(base_command)))
+    output = parse_issues(config, run_process(config, base_command), paths, log=log)
+
+    # black returns an issue for fixed files as well
+    for eachIssue in output:
+        if eachIssue.message == "reformatted":
+            fixed += 1
+
+    return {"results": output, "fixed": fixed}
+
+
+def lint(paths, config, fix=None, **lintargs):
+    files = list(expand_exclusions(paths, config, lintargs["root"]))
+
+    return run_black(
+        config,
+        files,
+        fix=fix,
+        log=lintargs["log"],
+        virtualenv_bin_path=lintargs.get("virtualenv_bin_path"),
+    )
diff --git a/tools/lint/python/black_requirements.in b/tools/lint/python/black_requirements.in
new file mode 100644
index 0000000000..e5efa47492
--- /dev/null
+++ b/tools/lint/python/black_requirements.in
@@ -0,0 +1,4 @@
+black==21.11b1
+typing-extensions==3.10.0.2
+dataclasses==0.6
+
diff --git a/tools/lint/python/black_requirements.txt b/tools/lint/python/black_requirements.txt
new file mode 100644
index 0000000000..ffa9ef3564
--- /dev/null
+++ b/tools/lint/python/black_requirements.txt
@@ -0,0 +1,117 @@
+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    pip-compile --generate-hashes --output-file=tools/lint/python/black_requirements.txt tools/lint/python/black_requirements.in
+#
+black==21.11b1 \
+    --hash=sha256:802c6c30b637b28645b7fde282ed2569c0cd777dbe493a41b6a03c1d903f99ac \
+    --hash=sha256:a042adbb18b3262faad5aff4e834ff186bb893f95ba3a8013f09de1e5569def2
+    # via -r tools/lint/python/black_requirements.in
+click==8.0.3 \
+    --hash=sha256:353f466495adaeb40b6b5f592f9f91cb22372351c84caeb068132442a4518ef3 \
+    --hash=sha256:410e932b050f5eed773c4cda94de75971c89cdb3155a72a0831139a79e5ecb5b
+    # via black
+dataclasses==0.6 \
+    --hash=sha256:454a69d788c7fda44efd71e259be79577822f5e3f53f029a22d08004e951dc9f \
+    --hash=sha256:6988bd2b895eef432d562370bb707d540f32f7360ab13da45340101bc2307d84
+    # via -r tools/lint/python/black_requirements.in
+mypy-extensions==0.4.3 \
+    --hash=sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d \
+    --hash=sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8
+    # via black
+pathspec==0.9.0 \
+    --hash=sha256:7d15c4ddb0b5c802d161efc417ec1a2558ea2653c2e8ad9c19098201dc1c993a \
+    --hash=sha256:e564499435a2673d586f6b2130bb5b95f04a3ba06f81b8f895b651a3c76aabb1
+    # via black
+platformdirs==2.4.0 \
+    --hash=sha256:367a5e80b3d04d2428ffa76d33f124cf11e8fff2acdaa9b43d545f5c7d661ef2 \
+    --hash=sha256:8868bbe3c3c80d42f20156f22e7131d2fb321f5bc86a2a345375c6481a67021d
+    # via black
+regex==2021.11.10 \
+    --hash=sha256:05b7d6d7e64efe309972adab77fc2af8907bb93217ec60aa9fe12a0dad35874f \
+    --hash=sha256:0617383e2fe465732af4509e61648b77cbe3aee68b6ac8c0b6fe934db90be5cc \
+    --hash=sha256:07856afef5ffcc052e7eccf3213317fbb94e4a5cd8177a2caa69c980657b3cb4 \
+    --hash=sha256:162abfd74e88001d20cb73ceaffbfe601469923e875caf9118333b1a4aaafdc4 \
+    --hash=sha256:2207ae4f64ad3af399e2d30dde66f0b36ae5c3129b52885f1bffc2f05ec505c8 \
+    --hash=sha256:30ab804ea73972049b7a2a5c62d97687d69b5a60a67adca07eb73a0ddbc9e29f \
+    --hash=sha256:3b5df18db1fccd66de15aa59c41e4f853b5df7550723d26aa6cb7f40e5d9da5a \
+    --hash=sha256:3c5fb32cc6077abad3bbf0323067636d93307c9fa93e072771cf9a64d1c0f3ef \
+    --hash=sha256:416c5f1a188c91e3eb41e9c8787288e707f7d2ebe66e0a6563af280d9b68478f \
+    --hash=sha256:432bd15d40ed835a51617521d60d0125867f7b88acf653e4ed994a1f8e4995dc \
+    --hash=sha256:4aaa4e0705ef2b73dd8e36eeb4c868f80f8393f5f4d855e94025ce7ad8525f50 \
+    --hash=sha256:537ca6a3586931b16a85ac38c08cc48f10fc870a5b25e51794c74df843e9966d \
+    --hash=sha256:53db2c6be8a2710b359bfd3d3aa17ba38f8aa72a82309a12ae99d3c0c3dcd74d \
+    --hash=sha256:5537f71b6d646f7f5f340562ec4c77b6e1c915f8baae822ea0b7e46c1f09b733 \
+    --hash=sha256:6650f16365f1924d6014d2ea770bde8555b4a39dc9576abb95e3cd1ff0263b36 \
+    --hash=sha256:666abff54e474d28ff42756d94544cdfd42e2ee97065857413b72e8a2d6a6345 \
+    --hash=sha256:68a067c11463de2a37157930d8b153005085e42bcb7ad9ca562d77ba7d1404e0 \
+    --hash=sha256:780b48456a0f0ba4d390e8b5f7c661fdd218934388cde1a974010a965e200e12 \
+    --hash=sha256:788aef3549f1924d5c38263104dae7395bf020a42776d5ec5ea2b0d3d85d6646 \
+    --hash=sha256:7ee1227cf08b6716c85504aebc49ac827eb88fcc6e51564f010f11a406c0a667 \
+    --hash=sha256:7f301b11b9d214f83ddaf689181051e7f48905568b0c7017c04c06dfd065e244 \
+    --hash=sha256:83ee89483672b11f8952b158640d0c0ff02dc43d9cb1b70c1564b49abe92ce29 \
+    --hash=sha256:85bfa6a5413be0ee6c5c4a663668a2cad2cbecdee367630d097d7823041bdeec \
+    --hash=sha256:9345b6f7ee578bad8e475129ed40123d265464c4cfead6c261fd60fc9de00bcf \
+    --hash=sha256:93a5051fcf5fad72de73b96f07d30bc29665697fb8ecdfbc474f3452c78adcf4 \
+    --hash=sha256:962b9a917dd7ceacbe5cd424556914cb0d636001e393b43dc886ba31d2a1e449 \
+    --hash=sha256:98ba568e8ae26beb726aeea2273053c717641933836568c2a0278a84987b2a1a \
+    --hash=sha256:a3feefd5e95871872673b08636f96b61ebef62971eab044f5124fb4dea39919d \
+    --hash=sha256:b43c2b8a330a490daaef5a47ab114935002b13b3f9dc5da56d5322ff218eeadb \
+    --hash=sha256:b483c9d00a565633c87abd0aaf27eb5016de23fed952e054ecc19ce32f6a9e7e \
+    --hash=sha256:ba05430e819e58544e840a68b03b28b6d328aff2e41579037e8bab7653b37d83 \
+    --hash=sha256:ca5f18a75e1256ce07494e245cdb146f5a9267d3c702ebf9b65c7f8bd843431e \
+    --hash=sha256:d5ca078bb666c4a9d1287a379fe617a6dccd18c3e8a7e6c7e1eb8974330c626a \
+    --hash=sha256:da1a90c1ddb7531b1d5ff1e171b4ee61f6345119be7351104b67ff413843fe94 \
+    --hash=sha256:dba70f30fd81f8ce6d32ddeef37d91c8948e5d5a4c63242d16a2b2df8143aafc \
+    --hash=sha256:dd33eb9bdcfbabab3459c9ee651d94c842bc8a05fabc95edf4ee0c15a072495e \
+    --hash=sha256:e0538c43565ee6e703d3a7c3bdfe4037a5209250e8502c98f20fea6f5fdf2965 \
+    --hash=sha256:e1f54b9b4b6c53369f40028d2dd07a8c374583417ee6ec0ea304e710a20f80a0 \
+    --hash=sha256:e32d2a2b02ccbef10145df9135751abea1f9f076e67a4e261b05f24b94219e36 \
+    --hash=sha256:e71255ba42567d34a13c03968736c5d39bb4a97ce98188fafb27ce981115beec \
+    --hash=sha256:ed2e07c6a26ed4bea91b897ee2b0835c21716d9a469a96c3e878dc5f8c55bb23 \
+    --hash=sha256:eef2afb0fd1747f33f1ee3e209bce1ed582d1896b240ccc5e2697e3275f037c7 \
+    --hash=sha256:f23222527b307970e383433daec128d769ff778d9b29343fb3496472dc20dabe \
+    --hash=sha256:f341ee2df0999bfdf7a95e448075effe0db212a59387de1a70690e4acb03d4c6 \
+    --hash=sha256:f7f325be2804246a75a4f45c72d4ce80d2443ab815063cdf70ee8fb2ca59ee1b \
+    --hash=sha256:f8af619e3be812a2059b212064ea7a640aff0568d972cd1b9e920837469eb3cb \
+    --hash=sha256:fa8c626d6441e2d04b6ee703ef2d1e17608ad44c7cb75258c09dd42bacdfc64b \
+    --hash=sha256:fbb9dc00e39f3e6c0ef48edee202f9520dafb233e8b51b06b8428cfcb92abd30 \
+    --hash=sha256:fff55f3ce50a3ff63ec8e2a8d3dd924f1941b250b0aac3d3d42b687eeff07a8e
+    # via black
+tomli==1.2.2 \
+    --hash=sha256:c6ce0015eb38820eaf32b5db832dbc26deb3dd427bd5f6556cf0acac2c214fee \
+    --hash=sha256:f04066f68f5554911363063a30b108d2b5a5b1a010aa8b6132af78489fe3aade
+    # via black
+typed-ast==1.5.4 \
+    --hash=sha256:0261195c2062caf107831e92a76764c81227dae162c4f75192c0d489faf751a2 \
+    --hash=sha256:0fdbcf2fef0ca421a3f5912555804296f0b0960f0418c440f5d6d3abb549f3e1 \
+    --hash=sha256:183afdf0ec5b1b211724dfef3d2cad2d767cbefac291f24d69b00546c1837fb6 \
+    --hash=sha256:211260621ab1cd7324e0798d6be953d00b74e0428382991adfddb352252f1d62 \
+    --hash=sha256:267e3f78697a6c00c689c03db4876dd1efdfea2f251a5ad6555e82a26847b4ac \
+    --hash=sha256:2efae9db7a8c05ad5547d522e7dbe62c83d838d3906a3716d1478b6c1d61388d \
+    --hash=sha256:370788a63915e82fd6f212865a596a0fefcbb7d408bbbb13dea723d971ed8bdc \
+    --hash=sha256:39e21ceb7388e4bb37f4c679d72707ed46c2fbf2a5609b8b8ebc4b067d977df2 \
+    --hash=sha256:3e123d878ba170397916557d31c8f589951e353cc95fb7f24f6bb69adc1a8a97 \
+    --hash=sha256:4879da6c9b73443f97e731b617184a596ac1235fe91f98d279a7af36c796da35 \
+    --hash=sha256:4e964b4ff86550a7a7d56345c7864b18f403f5bd7380edf44a3c1fb4ee7ac6c6 \
+    --hash=sha256:639c5f0b21776605dd6c9dbe592d5228f021404dafd377e2b7ac046b0349b1a1 \
+    --hash=sha256:669dd0c4167f6f2cd9f57041e03c3c2ebf9063d0757dc89f79ba1daa2bfca9d4 \
+    --hash=sha256:6778e1b2f81dfc7bc58e4b259363b83d2e509a65198e85d5700dfae4c6c8ff1c \
+    --hash=sha256:683407d92dc953c8a7347119596f0b0e6c55eb98ebebd9b23437501b28dcbb8e \
+    --hash=sha256:79b1e0869db7c830ba6a981d58711c88b6677506e648496b1f64ac7d15633aec \
+    --hash=sha256:7d5d014b7daa8b0bf2eaef684295acae12b036d79f54178b92a2b6a56f92278f \
+    --hash=sha256:98f80dee3c03455e92796b58b98ff6ca0b2a6f652120c263efdba4d6c5e58f72 \
+    --hash=sha256:a94d55d142c9265f4ea46fab70977a1944ecae359ae867397757d836ea5a3f47 \
+    --hash=sha256:a9916d2bb8865f973824fb47436fa45e1ebf2efd920f2b9f99342cb7fab93f72 \
+    --hash=sha256:c542eeda69212fa10a7ada75e668876fdec5f856cd3d06829e6aa64ad17c8dfe \
+    --hash=sha256:cf4afcfac006ece570e32d6fa90ab74a17245b83dfd6655a6f68568098345ff6 \
+    --hash=sha256:ebd9d7f80ccf7a82ac5f88c521115cc55d84e35bf8b446fcd7836eb6b98929a3 \
+    --hash=sha256:ed855bbe3eb3715fca349c80174cfcfd699c2f9de574d40527b8429acae23a66
+typing-extensions==3.10.0.2 \
+    --hash=sha256:49f75d16ff11f1cd258e1b988ccff82a3ca5570217d7ad8c5f48205dd99a677e \
+    --hash=sha256:d8226d10bc02a29bcc81df19a26e56a9647f8b0a6d4a83924139f4a8b01f17b7 \
+    --hash=sha256:f1d25edafde516b146ecd0613dabcc61409817af4766fbbcfb8d1ad4ec441a34
+    # via
+    #   -r tools/lint/python/black_requirements.in
+    #   black
diff --git a/tools/lint/python/l10n_lint.py b/tools/lint/python/l10n_lint.py
new file mode 100644
index 0000000000..ef3269ef2a
--- /dev/null
+++ b/tools/lint/python/l10n_lint.py
@@ -0,0 +1,171 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+from datetime import datetime, timedelta
+
+import mozversioncontrol.repoupdate
+from compare_locales import parser
+from compare_locales.lint.linter import L10nLinter
+from compare_locales.lint.util import l10n_base_reference_and_tests
+from compare_locales.paths import ProjectFiles, TOMLParser
+from mach import util as mach_util
+from mozlint import pathutils, result
+from mozpack import path as mozpath
+
+LOCALE = "gecko-strings"
+STRINGS_REPO = "https://hg.mozilla.org/l10n/gecko-strings"
+
+PULL_AFTER = timedelta(days=2)
+
+# Wrapper to call lint_strings with mozilla-central configuration
+# comm-central defines its own wrapper since comm-central strings are
+# in separate repositories
+def lint(paths, lintconfig, **lintargs):
+    return lint_strings(LOCALE, paths, lintconfig, **lintargs)
+
+
+def lint_strings(locale, paths, lintconfig, **lintargs):
+    l10n_base = mach_util.get_state_dir()
+    root = lintargs["root"]
+    exclude = lintconfig.get("exclude")
+    extensions = lintconfig.get("extensions")
+
+    # Load l10n.toml configs
+    l10nconfigs = load_configs(lintconfig, root, l10n_base, locale)
+
+    # Check include paths in l10n.yml if it's in our given paths
+    # Only the l10n.yml will show up here, but if the l10n.toml files
+    # change, we also get the l10n.yml as the toml files are listed as
+    # support files.
+    if lintconfig["path"] in paths:
+        results = validate_linter_includes(lintconfig, l10nconfigs, lintargs)
+        paths.remove(lintconfig["path"])
+    else:
+        results = []
+
+    all_files = []
+    for p in paths:
+        fp = pathutils.FilterPath(p)
+        if fp.isdir:
+            for _, fileobj in fp.finder:
+                all_files.append(fileobj.path)
+        if fp.isfile:
+            all_files.append(p)
+    # Filter again, our directories might have picked up files the
+    # explicitly excluded in the l10n.yml configuration.
+    # `browser/locales/en-US/firefox-l10n.js` is a good example.
+    all_files, _ = pathutils.filterpaths(
+        lintargs["root"],
+        all_files,
+        lintconfig["include"],
+        exclude=exclude,
+        extensions=extensions,
+    )
+    # These should be excluded in l10n.yml
+    skips = {p for p in all_files if not parser.hasParser(p)}
+    results.extend(
+        result.from_config(
+            lintconfig,
+            level="warning",
+            path=path,
+            message="file format not supported in compare-locales",
+        )
+        for path in skips
+    )
+    all_files = [p for p in all_files if p not in skips]
+    files = ProjectFiles(locale, l10nconfigs)
+
+    get_reference_and_tests = l10n_base_reference_and_tests(files)
+
+    linter = MozL10nLinter(lintconfig)
+    results += linter.lint(all_files, get_reference_and_tests)
+    return results
+
+
+# Similar to the lint/lint_strings wrapper setup, for comm-central support.
+def gecko_strings_setup(**lint_args):
+    return strings_repo_setup(STRINGS_REPO, LOCALE)
+
+
+def strings_repo_setup(repo, locale):
+    gs = mozpath.join(mach_util.get_state_dir(), locale)
+    marker = mozpath.join(gs, ".hg", "l10n_pull_marker")
+    try:
+        last_pull = datetime.fromtimestamp(os.stat(marker).st_mtime)
+        skip_clone = datetime.now() < last_pull + PULL_AFTER
+    except OSError:
+        skip_clone = False
+    if skip_clone:
+        return
+    try:
+        hg = mozversioncontrol.get_tool_path("hg")
+    except mozversioncontrol.MissingVCSTool:
+        if os.environ.get("MOZ_AUTOMATION"):
+            raise
+        print("warning: l10n linter requires Mercurial but was unable to find 'hg'")
+        return 1
+    mozversioncontrol.repoupdate.update_mercurial_repo(hg, repo, gs)
+    with open(marker, "w") as fh:
+        fh.flush()
+
+
+def load_configs(lintconfig, root, l10n_base, locale):
+    """Load l10n configuration files specified in the linter configuration."""
+    configs = []
+    env = {"l10n_base": l10n_base}
+    for toml in lintconfig["l10n_configs"]:
+        cfg = TOMLParser().parse(
+            mozpath.join(root, toml), env=env, ignore_missing_includes=True
+        )
+        cfg.set_locales([locale], deep=True)
+        configs.append(cfg)
+    return configs
+
+
+def validate_linter_includes(lintconfig, l10nconfigs, lintargs):
+    """Check l10n.yml config against l10n.toml configs."""
+    reference_paths = set(
+        mozpath.relpath(p["reference"].prefix, lintargs["root"])
+        for project in l10nconfigs
+        for config in project.configs
+        for p in config.paths
+    )
+    # Just check for directories
+    reference_dirs = sorted(p for p in reference_paths if os.path.isdir(p))
+    missing_in_yml = [
+        refd for refd in reference_dirs if refd not in lintconfig["include"]
+    ]
+    # These might be subdirectories in the config, though
+    missing_in_yml = [
+        d
+        for d in missing_in_yml
+        if not any(d.startswith(parent + "/") for parent in lintconfig["include"])
+    ]
+    if missing_in_yml:
+        dirs = ", ".join(missing_in_yml)
+        return [
+            result.from_config(
+                lintconfig,
+                path=lintconfig["path"],
+                message="l10n.yml out of sync with l10n.toml, add: " + dirs,
+            )
+        ]
+    return []
+
+
+class MozL10nLinter(L10nLinter):
+    """Subclass linter to generate the right result type."""
+
+    def __init__(self, lintconfig):
+        super(MozL10nLinter, self).__init__()
+        self.lintconfig = lintconfig
+
+    def lint(self, files, get_reference_and_tests):
+        return [
+            result.from_config(self.lintconfig, **result_data)
+            for result_data in super(MozL10nLinter, self).lint(
+                files, get_reference_and_tests
+            )
+        ]
diff --git a/tools/lint/python/ruff.py b/tools/lint/python/ruff.py
new file mode 100644
index 0000000000..d8096199f3
--- /dev/null
+++ b/tools/lint/python/ruff.py
@@ -0,0 +1,187 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import os
+import platform
+import re
+import signal
+import subprocess
+import sys
+from pathlib import Path
+
+import mozfile
+from mozlint import result
+from mozprocess.processhandler import ProcessHandler
+
+here = os.path.abspath(os.path.dirname(__file__))
+RUFF_REQUIREMENTS_PATH = os.path.join(here, "ruff_requirements.txt")
+
+RUFF_NOT_FOUND = """
+Could not find ruff! Install ruff and try again.
+
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    RUFF_REQUIREMENTS_PATH
+)
+
+
+RUFF_INSTALL_ERROR = """
+Unable to install correct version of ruff!
+Try to install it manually with:
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    RUFF_REQUIREMENTS_PATH
+)
+
+
+def default_bindir():
+    # We use sys.prefix to find executables as that gets modified with
+    # virtualenv's activate_this.py, whereas sys.executable doesn't.
+    if platform.system() == "Windows":
+        return os.path.join(sys.prefix, "Scripts")
+    else:
+        return os.path.join(sys.prefix, "bin")
+
+
+def get_ruff_version(binary):
+    """
+    Returns found binary's version
+    """
+    try:
+        output = subprocess.check_output(
+            [binary, "--version"],
+            stderr=subprocess.STDOUT,
+            text=True,
+        )
+    except subprocess.CalledProcessError as e:
+        output = e.output
+
+    matches = re.match(r"ruff ([0-9\.]+)", output)
+    if matches:
+        return matches[1]
+    print("Error: Could not parse the version '{}'".format(output))
+
+
+def setup(root, log, **lintargs):
+    virtualenv_bin_path = lintargs.get("virtualenv_bin_path")
+    binary = mozfile.which("ruff", path=(virtualenv_bin_path, default_bindir()))
+
+    if binary and os.path.isfile(binary):
+        log.debug(f"Looking for ruff at {binary}")
+        version = get_ruff_version(binary)
+        versions = [
+            line.split()[0].strip()
+            for line in open(RUFF_REQUIREMENTS_PATH).readlines()
+            if line.startswith("ruff==")
+        ]
+        if [f"ruff=={version}"] == versions:
+            log.debug("ruff is present with expected version {}".format(version))
+            return 0
+        else:
+            log.debug("ruff is present but unexpected version {}".format(version))
+
+    virtualenv_manager = lintargs["virtualenv_manager"]
+    try:
+        virtualenv_manager.install_pip_requirements(RUFF_REQUIREMENTS_PATH, quiet=True)
+    except subprocess.CalledProcessError:
+        print(RUFF_INSTALL_ERROR)
+        return 1
+
+
+class RuffProcess(ProcessHandler):
+    def __init__(self, config, *args, **kwargs):
+        self.config = config
+        self.stderr = []
+        kwargs["stream"] = False
+        kwargs["universal_newlines"] = True
+        ProcessHandler.__init__(self, *args, **kwargs)
+
+    def run(self, *args, **kwargs):
+        orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+        ProcessHandler.run(self, *args, **kwargs)
+        signal.signal(signal.SIGINT, orig)
+
+
+def run_process(config, cmd, **kwargs):
+    proc = RuffProcess(config, cmd, **kwargs)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+    return "\n".join(proc.output)
+
+
+def lint(paths, config, log, **lintargs):
+    fixed = 0
+    results = []
+
+    if not paths:
+        return {"results": results, "fixed": fixed}
+
+    # Currently ruff only lints non `.py` files if they are explicitly passed
+    # in. So we need to find any non-py files manually. This can be removed
+    # after https://github.com/charliermarsh/ruff/issues/3410 is fixed.
+    exts = [e for e in config["extensions"] if e != "py"]
+    non_py_files = []
+    for path in paths:
+        p = Path(path)
+        if not p.is_dir():
+            continue
+        for ext in exts:
+            non_py_files.extend([str(f) for f in p.glob(f"**/*.{ext}")])
+
+    args = ["ruff", "check", "--force-exclude"] + paths + non_py_files
+
+    if config["exclude"]:
+        args.append(f"--extend-exclude={','.join(config['exclude'])}")
+
+    process_kwargs = {"processStderrLine": lambda line: log.debug(line)}
+
+    warning_rules = set(config.get("warning-rules", []))
+    if lintargs.get("fix"):
+        # Do a first pass with --fix-only as the json format doesn't return the
+        # number of fixed issues.
+        fix_args = args + ["--fix-only"]
+
+        # Don't fix warnings to limit unrelated changes sneaking into patches.
+        fix_args.append(f"--extend-ignore={','.join(warning_rules)}")
+        output = run_process(config, fix_args, **process_kwargs)
+        matches = re.match(r"Fixed (\d+) errors?.", output)
+        if matches:
+            fixed = int(matches[1])
+
+    log.debug(f"Running with args: {args}")
+
+    output = run_process(config, args + ["--format=json"], **process_kwargs)
+    if not output:
+        return []
+
+    try:
+        issues = json.loads(output)
+    except json.JSONDecodeError:
+        log.error(f"could not parse output: {output}")
+        return []
+
+    for issue in issues:
+        res = {
+            "path": issue["filename"],
+            "lineno": issue["location"]["row"],
+            "column": issue["location"]["column"],
+            "lineoffset": issue["end_location"]["row"] - issue["location"]["row"],
+            "message": issue["message"],
+            "rule": issue["code"],
+            "level": "error",
+        }
+        if any(issue["code"].startswith(w) for w in warning_rules):
+            res["level"] = "warning"
+
+        if issue["fix"]:
+            res["hint"] = issue["fix"]["message"]
+
+        results.append(result.from_config(config, **res))
+
+    return {"results": results, "fixed": fixed}
diff --git a/tools/lint/python/ruff_requirements.in b/tools/lint/python/ruff_requirements.in
new file mode 100644
index 0000000000..af3ee57638
--- /dev/null
+++ b/tools/lint/python/ruff_requirements.in
@@ -0,0 +1 @@
+ruff
diff --git a/tools/lint/python/ruff_requirements.txt b/tools/lint/python/ruff_requirements.txt
new file mode 100644
index 0000000000..1c8943c26b
--- /dev/null
+++ b/tools/lint/python/ruff_requirements.txt
@@ -0,0 +1,25 @@
+#
+# This file is autogenerated by pip-compile with Python 3.7
+# by the following command:
+#
+#    pip-compile --generate-hashes ruff_requirements.in
+#
+ruff==0.0.254 \
+    --hash=sha256:059a380c08e849b6f312479b18cc63bba2808cff749ad71555f61dd930e3c9a2 \
+    --hash=sha256:09c764bc2bd80c974f7ce1f73a46092c286085355a5711126af351b9ae4bea0c \
+    --hash=sha256:0deb1d7226ea9da9b18881736d2d96accfa7f328c67b7410478cc064ad1fa6aa \
+    --hash=sha256:0eb66c9520151d3bd950ea43b3a088618a8e4e10a5014a72687881e6f3606312 \
+    --hash=sha256:27d39d697fdd7df1f2a32c1063756ee269ad8d5345c471ee3ca450636d56e8c6 \
+    --hash=sha256:2fc21d060a3197ac463596a97d9b5db2d429395938b270ded61dd60f0e57eb21 \
+    --hash=sha256:688379050ae05394a6f9f9c8471587fd5dcf22149bd4304a4ede233cc4ef89a1 \
+    --hash=sha256:8deba44fd563361c488dedec90dc330763ee0c01ba54e17df54ef5820079e7e0 \
+    --hash=sha256:ac1429be6d8bd3db0bf5becac3a38bd56f8421447790c50599cd90fd53417ec4 \
+    --hash=sha256:b3f15d5d033fd3dcb85d982d6828ddab94134686fac2c02c13a8822aa03e1321 \
+    --hash=sha256:b435afc4d65591399eaf4b2af86e441a71563a2091c386cadf33eaa11064dc09 \
+    --hash=sha256:c38291bda4c7b40b659e8952167f386e86ec29053ad2f733968ff1d78b4c7e15 \
+    --hash=sha256:d4385cdd30153b7aa1d8f75dfd1ae30d49c918ead7de07e69b7eadf0d5538a1f \
+    --hash=sha256:dd58c500d039fb381af8d861ef456c3e94fd6855c3d267d6c6718c9a9fe07be0 \
+    --hash=sha256:e15742df0f9a3615fbdc1ee9a243467e97e75bf88f86d363eee1ed42cedab1ec \
+    --hash=sha256:ef20bf798ffe634090ad3dc2e8aa6a055f08c448810a2f800ab716cc18b80107 \
+    --hash=sha256:f70dc93bc9db15cccf2ed2a831938919e3e630993eeea6aba5c84bc274237885
+    # via -r ruff_requirements.in
diff --git a/tools/lint/rejected-words.yml b/tools/lint/rejected-words.yml
new file mode 100644
index 0000000000..523722ba32
--- /dev/null
+++ b/tools/lint/rejected-words.yml
@@ -0,0 +1,335 @@
+---
+avoid-blacklist-and-whitelist:
+    description: "Use words like 'skip', 'select', 'allow' or 'deny' instead"
+    level: error
+    include: ['.']
+    type: regex
+    payload: (black|white)[-_]?list
+    ignore-case: true
+    # Based on codespell with idl and webidl added.
+    extensions:
+        - js
+        - jsm
+        - mjs
+        - jxs
+        - idl
+        - webidl
+        - xml
+        - html
+        - xhtml
+        - cpp
+        - c
+        - h
+        - configure
+        - py
+        - properties
+        - rst
+        - md
+        - ftl
+        - yml
+        - java
+        - kt
+    exclude:
+        - '**/.eslintrc.js'
+        - browser/app/profile/firefox.js
+        - browser/app/winlauncher/LauncherProcessWin.cpp
+        - browser/base/content/browser.js
+        - browser/base/content/contentTheme.js
+        - browser/base/content/test/general/browser_remoteTroubleshoot.js
+        - browser/base/content/test/general/browser_tab_drag_drop_perwindow.js
+        - browser/base/content/test/performance/browser_preferences_usage.js
+        - browser/base/content/test/protectionsUI/browser_protectionsUI_cryptominers.js
+        - browser/base/content/test/protectionsUI/browser_protectionsUI_fingerprinters.js
+        - browser/base/content/test/protectionsUI/browser_protectionsUI_pbmode_exceptions.js
+        - browser/base/content/test/protectionsUI/browser_protectionsUI_report_breakage.js
+        - browser/base/content/test/protectionsUI/browser_protectionsUI_socialtracking.js
+        - browser/base/content/test/protectionsUI/browser_protectionsUI_state.js
+        - browser/base/content/test/protectionsUI/browser_protectionsUI_subview_shim.js
+        - browser/base/content/test/siteIdentity/browser_no_mcb_for_loopback.js
+        - browser/base/content/test/static/browser_all_files_referenced.js
+        - browser/base/content/test/static/browser_parsable_css.js
+        - browser/base/content/test/static/browser_parsable_script.js
+        - browser/base/content/test/tabMediaIndicator/browser_mute_webAudio.js
+        - browser/base/content/test/tabs/browser_new_file_whitelisted_http_tab.js
+        - browser/components/enterprisepolicies/Policies.sys.mjs
+        - browser/components/migration/ChromeMigrationUtils.sys.mjs
+        - browser/components/migration/ChromeProfileMigrator.sys.mjs
+        - browser/components/newtab/data/content/activity-stream.bundle.js
+        - browser/components/preferences/privacy.inc.xhtml
+        - browser/components/preferences/privacy.js
+        - browser/components/resistfingerprinting/test/mochitest/test_bug1354633_media_error.html
+        - browser/components/safebrowsing/content/test/browser_whitelisted.js
+        - browser/components/sessionstore/test/browser_crashedTabs.js
+        - browser/components/uitour/UITourChild.sys.mjs
+        - browser/components/urlbar/tests/browser/browser_searchSingleWordNotification.js
+        - browser/components/urlbar/tests/browser/browser_UrlbarInput_trimURLs.js
+        - browser/components/urlbar/tests/unit/test_providerHeuristicFallback.js
+        - browser/components/urlbar/tests/unit/test_search_suggestions.js
+        - browser/components/urlbar/tests/unit/test_tokenizer.js
+        - browser/extensions/screenshots/background/main.js
+        - browser/extensions/webcompat/shims/nielsen.js
+        - browser/modules/SitePermissions.sys.mjs
+        - browser/tools/mozscreenshots/mozscreenshots/extension/configurations/PermissionPrompts.sys.mjs
+        - build/clang-plugin/CustomMatchers.h
+        - build/clang-plugin/FopenUsageChecker.cpp
+        - build/clang-plugin/NaNExprChecker.cpp
+        - build/clang-plugin/NoPrincipalGetURI.cpp
+        - build/clang-plugin/tests/TestNANTestingExpr.cpp
+        - build/compare-mozconfig/compare-mozconfigs.py
+        - build/moz.configure/bindgen.configure
+        - build/moz.configure/toolchain.configure
+        - config/check_vanilla_allocations.py
+        - devtools/client/debugger/dist/parser-worker.js
+        - devtools/client/debugger/test/mochitest/examples/big-sourcemap_files/bundle.js
+        - devtools/client/debugger/test/mochitest/examples/ember/quickstart/dist/assets/vendor.js
+        - devtools/client/debugger/test/mochitest/examples/react/build/main.js
+        - devtools/client/debugger/test/mochitest/examples/react/build/service-worker.js
+        - devtools/client/inspector/markup/test/lib_babel_6.21.0_min.js
+        - devtools/client/inspector/markup/test/lib_react_dom_15.4.1.js
+        - docshell/base/nsDocShell.cpp
+        - docshell/base/URIFixup.sys.mjs
+        - docshell/test/unit/test_URIFixup_info.js
+        - dom/base/Document.cpp
+        - dom/base/MaybeCrossOriginObject.cpp
+        - dom/base/nsContentUtils.h
+        - dom/base/nsDataDocumentContentPolicy.cpp
+        - dom/base/nsGlobalWindowOuter.cpp
+        - dom/base/nsTreeSanitizer.cpp
+        - dom/base/nsTreeSanitizer.h
+        - dom/base/test/browser_multiple_popups.js
+        - dom/base/test/browser_timeout_throttling_with_audio_playback.js
+        - dom/base/test/chrome/test_permission_hasValidTransientUserActivation.xhtml
+        - dom/bindings/Codegen.py
+        - dom/bindings/parser/WebIDL.py
+        - dom/bindings/RemoteObjectProxy.cpp
+        - dom/events/EventStateManager.cpp
+        - dom/events/KeyboardEvent.cpp
+        - dom/html/MediaError.cpp
+        - dom/indexedDB/ActorsParent.cpp
+        - dom/ipc/ContentParent.cpp
+        - dom/ipc/URLClassifierParent.cpp
+        - dom/media/autoplay/AutoplayPolicy.cpp
+        - dom/media/gmp/GMPChild.cpp
+        - dom/media/MediaManager.cpp
+        - dom/media/mp4/MP4Decoder.cpp
+        - dom/media/platforms/apple/AppleVTDecoder.cpp
+        - dom/media/platforms/wmf/DXVA2Manager.cpp
+        - dom/media/platforms/wmf/WMFVideoMFTManager.cpp
+        - dom/media/autoplay/test/mochitest/file_autoplay_policy_key_blacklist.html
+        - dom/media/autoplay/test/mochitest/test_autoplay_policy_key_blacklist.html
+        - dom/media/autoplay/test/mochitest/test_autoplay_policy_permission.html
+        - dom/media/webm/WebMDecoder.cpp
+        - dom/media/webrtc/transport/stun_socket_filter.cpp
+        - dom/media/webrtc/transport/test/ice_unittest.cpp
+        - dom/plugins/base/nsPluginHost.h
+        - dom/tests/mochitest/dom-level0/idn_child.html
+        - dom/tests/mochitest/dom-level0/test_setting_document.domain_idn.html
+        - dom/tests/mochitest/whatwg/test_postMessage_origin.xhtml
+        - gfx/gl/GLContextProviderWGL.cpp
+        - gfx/gl/GLUploadHelpers.cpp
+        - gfx/tests/mochitest/test_font_whitelist.html
+        - gfx/thebes/gfxFT2FontList.cpp
+        - gfx/thebes/gfxPlatformFontList.cpp
+        - gfx/thebes/gfxPlatformFontList.h
+        - gfx/thebes/gfxUserFontSet.cpp
+        - gfx/thebes/gfxWindowsPlatform.cpp
+        - gfx/thebes/SharedFontList.cpp
+        - intl/strres/nsStringBundle.cpp
+        - ipc/glue/GeckoChildProcessHost.cpp
+        - js/src/debugger/DebugAPI.h
+        - js/src/devtools/rootAnalysis/analyzeHeapWrites.js
+        - js/src/jit/CodeGenerator.cpp
+        - js/src/jit-test/tests/auto-regress/bug687399.js
+        - js/src/jit-test/tests/basic/missingArgTest2.js
+        - js/src/tests/non262/regress/regress-450369.js
+        - js/xpconnect/src/Sandbox.cpp
+        - js/xpconnect/src/XPCJSRuntime.cpp
+        - js/xpconnect/src/xpcpublic.h
+        - js/xpconnect/src/XPCWrappedNativeScope.cpp
+        - js/xpconnect/tests/unit/head_watchdog.js
+        - js/xpconnect/wrappers/FilteringWrapper.cpp
+        - js/xpconnect/wrappers/XrayWrapper.cpp
+        - layout/base/PositionedEventTargeting.cpp
+        - layout/base/PresShell.cpp
+        - layout/base/PresShell.h
+        - layout/reftests/css-placeholder/css-restrictions.html
+        - layout/style/test/test_computed_style_difference.html
+        - layout/tools/reftest/mach_commands.py
+        - layout/tools/reftest/mach_test_package_commands.py
+        - layout/tools/reftest/reftestcommandline.py
+        - layout/tools/reftest/runreftest.py
+        - layout/tools/reftest/selftest/conftest.py
+        - mobile/android/app/mobile.js
+        - mobile/android/geckoview/src/main/java/org/mozilla/gecko/util/HardwareCodecCapabilityUtils.java
+        - mobile/android/geckoview/src/main/java/org/mozilla/geckoview/ContentBlocking.java
+        - mobile/android/geckoview/src/main/java/org/mozilla/geckoview/CrashReporter.java
+        - mobile/android/geckoview/src/main/java/org/mozilla/geckoview/WebAuthnTokenManager.java
+        - modules/libpref/Preferences.cpp
+        - modules/libpref/init/all.js
+        - netwerk/base/nsIPermissionManager.idl
+        - netwerk/base/nsIProtocolHandler.idl
+        - netwerk/base/nsIOService.cpp
+        - netwerk/base/nsIURI.idl
+        - netwerk/base/nsURLHelper.cpp
+        - netwerk/cookie/CookieCommons.h
+        - netwerk/dns/nsHostRecord.cpp
+        - netwerk/dns/nsIDNService.cpp
+        - netwerk/dns/nsIIDNService.idl
+        - netwerk/dns/TRR.cpp
+        - netwerk/ipc/DocumentLoadListener.cpp
+        - netwerk/protocol/http/HttpBaseChannel.cpp
+        - netwerk/protocol/http/nsHttpChannel.cpp
+        - netwerk/protocol/http/nsHttpConnectionMgr.cpp
+        - netwerk/protocol/viewsource/nsViewSourceChannel.cpp
+        - netwerk/protocol/websocket/BaseWebSocketChannel.cpp
+        - netwerk/socket/nsSOCKSSocketProvider.cpp
+        - netwerk/test/unit/test_bug464591.js
+        - netwerk/test/unit/test_cookie_blacklist.js
+        - netwerk/test/unit/test_idn_blacklist.js
+        - netwerk/url-classifier/UrlClassifierCommon.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureCryptominingAnnotation.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureCryptominingProtection.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureFingerprintingAnnotation.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureFingerprintingProtection.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureSocialTrackingAnnotation.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureSocialTrackingProtection.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureTrackingAnnotation.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureTrackingProtection.cpp
+        - python/mozbuild/mozbuild/backend/recursivemake.py
+        - python/mozbuild/mozbuild/configure/options.py
+        - python/mozbuild/mozbuild/vendor/vendor_rust.py
+        - remote/cdp/Protocol.sys.mjs
+        - security/manager/ssl/tests/unit/test_intermediate_preloads.js
+        - security/sandbox/linux/broker/SandboxBroker.cpp
+        - security/sandbox/linux/broker/SandboxBroker.h
+        - security/sandbox/linux/broker/SandboxBrokerPolicyFactory.cpp
+        - security/sandbox/linux/glue/SandboxPrefBridge.cpp
+        - security/sandbox/linux/gtest/TestBroker.cpp
+        - security/sandbox/linux/Sandbox.cpp
+        - security/sandbox/linux/SandboxFilter.cpp
+        - security/sandbox/linux/SandboxFilterUtil.h
+        - security/sandbox/linux/Sandbox.h
+        - taskcluster/ci/docker-image/kind.yml
+        - taskcluster/gecko_taskgraph/actions/create_interactive.py
+        - taskcluster/gecko_taskgraph/transforms/test/other.py
+        - taskcluster/gecko_taskgraph/try_option_syntax.py
+        - testing/condprofile/condprof/client.py
+        - testing/condprofile/condprof/tests/profile/prefs.js
+        - testing/condprofile/condprof/tests/test_client.py
+        - testing/firefox-ui/tests/functional/safebrowsing/test_initial_download.py
+        - testing/marionette/client/marionette_driver/wait.py
+        - testing/mochitest/browser-test.js
+        - testing/mochitest/mach_test_package_commands.py
+        - testing/mochitest/mochitest_options.py
+        - testing/mochitest/runtests.py
+        - testing/mozbase/mozprofile/mozprofile/profile.py
+        - testing/mozharness/configs/unittests/linux_unittest.py
+        - testing/mozharness/configs/unittests/mac_unittest.py
+        - testing/mozharness/configs/unittests/win_unittest.py
+        - testing/profiles/unittest-required/user.js
+        - testing/raptor/browsertime/browsertime_scenario.js
+        - testing/raptor/raptor/control_server.py
+        - testing/talos/talos/tests/devtools/addon/content/pages/custom/debugger/static/js/main.js
+        - testing/web-platform/tests/tools/manifest/tests/test_manifest.py
+        - toolkit/actors/RemotePageChild.sys.mjs
+        - toolkit/actors/WebChannelChild.sys.mjs
+        - toolkit/components/antitracking/test/browser/browser_socialtracking_save_image.js
+        - toolkit/components/reputationservice/ApplicationReputation.cpp
+        - toolkit/components/reputationservice/chromium/chrome/common/safe_browsing/csd.pb.h
+        - toolkit/components/reputationservice/LoginReputation.cpp
+        - toolkit/components/reputationservice/LoginReputation.h
+        - toolkit/components/reputationservice/test/unit/head_download_manager.js
+        - toolkit/components/reputationservice/test/unit/test_app_rep.js
+        - toolkit/components/reputationservice/test/unit/test_app_rep_maclinux.js
+        - toolkit/components/reputationservice/test/unit/test_app_rep_windows.js
+        - toolkit/components/reputationservice/test/unit/test_login_rep.js
+        - toolkit/components/satchel/test/test_form_autocomplete.html
+        - toolkit/components/telemetry/docs/data/environment.rst
+        - toolkit/components/url-classifier/nsUrlClassifierUtils.cpp
+        - toolkit/components/url-classifier/SafeBrowsing.sys.mjs
+        - toolkit/components/url-classifier/tests/mochitest/features.js
+        - toolkit/components/url-classifier/tests/mochitest/good.js
+        - toolkit/components/url-classifier/tests/mochitest/test_annotation_vs_TP.html
+        - toolkit/components/url-classifier/tests/mochitest/test_classified_annotations.html
+        - toolkit/components/url-classifier/tests/mochitest/test_classify_by_default.html
+        - toolkit/components/url-classifier/tests/mochitest/test_classify_ping.html
+        - toolkit/components/url-classifier/tests/mochitest/test_cryptomining_annotate.html
+        - toolkit/components/url-classifier/tests/mochitest/test_cryptomining.html
+        - toolkit/components/url-classifier/tests/mochitest/test_fingerprinting_annotate.html
+        - toolkit/components/url-classifier/tests/mochitest/test_fingerprinting.html
+        - toolkit/components/url-classifier/tests/mochitest/test_safebrowsing_bug1272239.html
+        - toolkit/components/url-classifier/tests/mochitest/test_socialtracking_annotate.html
+        - toolkit/components/url-classifier/tests/mochitest/test_socialtracking.html
+        - toolkit/components/url-classifier/tests/mochitest/test_trackingprotection_bug1580416.html
+        - toolkit/components/url-classifier/tests/mochitest/test_trackingprotection_whitelist.html
+        - toolkit/components/url-classifier/tests/unit/head_urlclassifier.js
+        - toolkit/components/url-classifier/tests/unit/test_digest256.js
+        - toolkit/components/url-classifier/tests/unit/test_platform_specific_threats.js
+        - toolkit/components/url-classifier/tests/UrlClassifierTestUtils.sys.mjs
+        - toolkit/content/aboutTelemetry.js
+        - toolkit/content/tests/browser/browser_delay_autoplay_webAudio.js
+        - toolkit/modules/PermissionsUtils.sys.mjs
+        - toolkit/modules/tests/browser/browser_AsyncPrefs.js
+        - toolkit/modules/tests/browser/browser_web_channel.js
+        - toolkit/modules/tests/xpcshell/test_PermissionsUtils.js
+        - toolkit/modules/third_party/jsesc/jsesc.js
+        - toolkit/modules/Troubleshoot.sys.mjs
+        - toolkit/mozapps/extensions/internal/XPIInstall.jsm
+        - toolkit/mozapps/extensions/test/browser/browser_html_discover_view.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_Device.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_DriverNew.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_Equal_DriverNew.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_Equal_DriverOld.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_Equal_OK.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_GTE_DriverOld.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_GTE_OK.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_No_Comparison.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_OK.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_OS.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_OSVersion_match.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_OSVersion_mismatch_DriverVersion.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_OSVersion_mismatch_OSVersion.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_prefs.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_Vendor.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_Version.js
+        - toolkit/mozapps/extensions/test/xpcshell/test_permissions.js
+        - toolkit/mozapps/extensions/test/xpcshell/test_permissions_prefs.js
+        - toolkit/mozapps/extensions/test/xpinstall/browser_bug645699.js
+        - toolkit/mozapps/extensions/test/xpinstall/browser_doorhanger_installs.js
+        - toolkit/mozapps/extensions/test/xpinstall/browser_localfile3.js
+        - toolkit/mozapps/extensions/test/xpinstall/browser_localfile4.js
+        - toolkit/mozapps/extensions/test/xpinstall/browser_localfile4_postDownload.js
+        - toolkit/mozapps/extensions/test/xpinstall/head.js
+        - tools/fuzzing/messagemanager/MessageManagerFuzzer.cpp
+        - tools/fuzzing/messagemanager/MessageManagerFuzzer.h
+        - tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-define-cc-etc.js
+        - tools/lint/rejected-words.yml
+        - tools/tryselect/selectors/chooser/__init__.py
+        - tools/tryselect/task_config.py
+        - widget/android/GfxInfo.cpp
+        - widget/GfxInfoBase.cpp
+        - widget/gtk/IMContextWrapper.cpp
+        - widget/gtk/nsAppShell.cpp
+        - widget/windows/GfxInfo.cpp
+        - widget/windows/WinUtils.cpp
+        - widget/windows/WinUtils.h
+        - xpcom/io/FilePreferences.cpp
+        - xpcom/tests/gtest/TestFilePreferencesUnix.cpp
+
+# ---
+# Disable for now. Needs some dev to handle this
+# avoid-master-and-slave:
+#    description: "Use words like 'controller', 'worker' instead"
+---
+avoid-gobbledygook:
+    description: "American English colloquialism. Use 'nonsense' instead."
+    level: error
+    include: ['.']
+    type: regex
+    payload: \b(gobbledy)?-?gook
+    ignore-case: true
+    exclude:
+        - extensions/spellcheck/locales/en-US/hunspell/dictionary-sources/orig/en_US-custom.dic
+        - extensions/spellcheck/locales/en-US/hunspell/dictionary-sources/utf8/en-US-utf8.dic
+        - extensions/spellcheck/locales/en-US/hunspell/en-US.dic
+        - tools/lint/rejected-words.yml
diff --git a/tools/lint/rst.yml b/tools/lint/rst.yml
new file mode 100644
index 0000000000..3f35fe7def
--- /dev/null
+++ b/tools/lint/rst.yml
@@ -0,0 +1,11 @@
+---
+rst:
+    description: RST linter
+    include: [.]
+    extensions:
+        - rst
+    support-files:
+        - 'tools/lint/rst/**'
+    type: external
+    payload: rst:lint
+    setup: rst:setup
diff --git a/tools/lint/rst/__init__.py b/tools/lint/rst/__init__.py
new file mode 100644
index 0000000000..7151c09a59
--- /dev/null
+++ b/tools/lint/rst/__init__.py
@@ -0,0 +1,116 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import re
+import subprocess
+
+from mozfile import which
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+# Error Levels
+# (0, 'debug')
+# (1, 'info')
+# (2, 'warning')
+# (3, 'error')
+# (4, 'severe')
+
+abspath = os.path.abspath(os.path.dirname(__file__))
+rstcheck_requirements_file = os.path.join(abspath, "requirements.txt")
+
+results = []
+
+RSTCHECK_NOT_FOUND = """
+Could not find rstcheck! Install rstcheck and try again.
+
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    rstcheck_requirements_file
+)
+
+RSTCHECK_INSTALL_ERROR = """
+Unable to install required version of rstcheck
+Try to install it manually with:
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    rstcheck_requirements_file
+)
+
+RSTCHECK_FORMAT_REGEX = re.compile(r"(.*):(.*): \(.*/([0-9]*)\) (.*)$")
+IGNORE_NOT_REF_LINK_UPSTREAM_BUG = re.compile(
+    r"Hyperlink target (.*) is not referenced."
+)
+
+
+def setup(root, **lintargs):
+    virtualenv_manager = lintargs["virtualenv_manager"]
+    try:
+        virtualenv_manager.install_pip_requirements(
+            rstcheck_requirements_file, quiet=True
+        )
+    except subprocess.CalledProcessError:
+        print(RSTCHECK_INSTALL_ERROR)
+        return 1
+
+
+def get_rstcheck_binary():
+    """
+    Returns the path of the first rstcheck binary available
+    if not found returns None
+    """
+    binary = os.environ.get("RSTCHECK")
+    if binary:
+        return binary
+
+    return which("rstcheck")
+
+
+def parse_with_split(errors):
+    match = RSTCHECK_FORMAT_REGEX.match(errors)
+    filename, lineno, level, message = match.groups()
+
+    return filename, lineno, level, message
+
+
+def lint(files, config, **lintargs):
+    log = lintargs["log"]
+    config["root"] = lintargs["root"]
+    paths = expand_exclusions(files, config, config["root"])
+    paths = list(paths)
+    chunk_size = 50
+    binary = get_rstcheck_binary()
+    rstcheck_options = [
+        "--ignore-language=cpp,json",
+        "--ignore-roles=searchfox",
+    ]
+
+    while paths:
+        cmdargs = [which("python"), binary] + rstcheck_options + paths[:chunk_size]
+        log.debug("Command: {}".format(" ".join(cmdargs)))
+
+        proc = subprocess.Popen(
+            cmdargs,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            env=os.environ,
+            universal_newlines=True,
+        )
+        all_errors = proc.communicate()[1]
+        for errors in all_errors.split("\n"):
+            if len(errors) > 1:
+                filename, lineno, level, message = parse_with_split(errors)
+                if not IGNORE_NOT_REF_LINK_UPSTREAM_BUG.match(message):
+                    # Ignore an upstream bug
+                    # https://github.com/myint/rstcheck/issues/19
+                    res = {
+                        "path": filename,
+                        "message": message,
+                        "lineno": lineno,
+                        "level": "error" if int(level) >= 2 else "warning",
+                    }
+                    results.append(result.from_config(config, **res))
+        paths = paths[chunk_size:]
+
+    return results
diff --git a/tools/lint/rst/requirements.in b/tools/lint/rst/requirements.in
new file mode 100644
index 0000000000..ea24fde591
--- /dev/null
+++ b/tools/lint/rst/requirements.in
@@ -0,0 +1,19 @@
+alabaster==0.7.13
+charset-normalizer==2.0.12
+docutils==0.17.1
+idna==2.10
+imagesize==1.4.1
+importlib-metadata==6.0.0
+markupsafe==2.0.1
+packaging==20.9
+requests==2.27.1
+snowballstemmer==2.2.0
+sphinxcontrib-applehelp==1.0.2
+sphinxcontrib-htmlhelp==2.0.0
+sphinxcontrib-mermaid==0.8.1
+rstcheck==3.5.0
+Pygments==2.14.0
+pytz==2022.7.1
+urllib3==1.26.9
+# We need sphinx to avoid some rstcheck errors and warnings
+Sphinx==5.1.1
diff --git a/tools/lint/rst/requirements.txt b/tools/lint/rst/requirements.txt
new file mode 100644
index 0000000000..568da2401a
--- /dev/null
+++ b/tools/lint/rst/requirements.txt
@@ -0,0 +1,210 @@
+#
+# This file is autogenerated by pip-compile with Python 3.10
+# by the following command:
+#
+#    pip-compile --generate-hashes ./tools/lint/rst/requirements.in
+#
+alabaster==0.7.13 \
+    --hash=sha256:1ee19aca801bbabb5ba3f5f258e4422dfa86f82f3e9cefb0859b283cdd7f62a3 \
+    --hash=sha256:a27a4a084d5e690e16e01e03ad2b2e552c61a65469419b907243193de1a84ae2
+    # via
+    #   -r ./tools/lint/rst/requirements.in
+    #   sphinx
+babel==2.12.1 \
+    --hash=sha256:b4246fb7677d3b98f501a39d43396d3cafdc8eadb045f4a31be01863f655c610 \
+    --hash=sha256:cc2d99999cd01d44420ae725a21c9e3711b3aadc7976d6147f622d8581963455
+    # via sphinx
+certifi==2022.12.7 \
+    --hash=sha256:35824b4c3a97115964b408844d64aa14db1cc518f6562e8d7261699d1350a9e3 \
+    --hash=sha256:4ad3232f5e926d6718ec31cfc1fcadfde020920e278684144551c91769c7bc18
+    # via requests
+charset-normalizer==2.0.12 \
+    --hash=sha256:2857e29ff0d34db842cd7ca3230549d1a697f96ee6d3fb071cfa6c7393832597 \
+    --hash=sha256:6881edbebdb17b39b4eaaa821b438bf6eddffb4468cf344f09f89def34a8b1df
+    # via
+    #   -r ./tools/lint/rst/requirements.in
+    #   requests
+docutils==0.17.1 \
+    --hash=sha256:686577d2e4c32380bb50cbb22f575ed742d58168cee37e99117a854bcd88f125 \
+    --hash=sha256:cf316c8370a737a022b72b56874f6602acf974a37a9fba42ec2876387549fc61
+    # via
+    #   -r ./tools/lint/rst/requirements.in
+    #   rstcheck
+    #   sphinx
+idna==2.10 \
+    --hash=sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6 \
+    --hash=sha256:b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0
+    # via
+    #   -r ./tools/lint/rst/requirements.in
+    #   requests
+imagesize==1.4.1 \
+    --hash=sha256:0d8d18d08f840c19d0ee7ca1fd82490fdc3729b7ac93f49870406ddde8ef8d8b \
+    --hash=sha256:69150444affb9cb0d5cc5a92b3676f0b2fb7cd9ae39e947a5e11a36b4497cd4a
+    # via
+    #   -r ./tools/lint/rst/requirements.in
+    #   sphinx
+importlib-metadata==6.0.0 \
+    --hash=sha256:7efb448ec9a5e313a57655d35aa54cd3e01b7e1fbcf72dce1bf06119420f5bad \
+    --hash=sha256:e354bedeb60efa6affdcc8ae121b73544a7aa74156d047311948f6d711cd378d
+    # via
+    #   -r ./tools/lint/rst/requirements.in
+    #   sphinx
+jinja2==3.1.2 \
+    --hash=sha256:31351a702a408a9e7595a8fc6150fc3f43bb6bf7e319770cbc0db9df9437e852 \
+    --hash=sha256:6088930bfe239f0e6710546ab9c19c9ef35e29792895fed6e6e31a023a182a61
+    # via sphinx
+markupsafe==2.0.1 \
+    --hash=sha256:01a9b8ea66f1658938f65b93a85ebe8bc016e6769611be228d797c9d998dd298 \
+    --hash=sha256:023cb26ec21ece8dc3907c0e8320058b2e0cb3c55cf9564da612bc325bed5e64 \
+    --hash=sha256:0446679737af14f45767963a1a9ef7620189912317d095f2d9ffa183a4d25d2b \
+    --hash=sha256:04635854b943835a6ea959e948d19dcd311762c5c0c6e1f0e16ee57022669194 \
+    --hash=sha256:0717a7390a68be14b8c793ba258e075c6f4ca819f15edfc2a3a027c823718567 \
+    --hash=sha256:0955295dd5eec6cb6cc2fe1698f4c6d84af2e92de33fbcac4111913cd100a6ff \
+    --hash=sha256:0d4b31cc67ab36e3392bbf3862cfbadac3db12bdd8b02a2731f509ed5b829724 \
+    --hash=sha256:10f82115e21dc0dfec9ab5c0223652f7197feb168c940f3ef61563fc2d6beb74 \
+    --hash=sha256:168cd0a3642de83558a5153c8bd34f175a9a6e7f6dc6384b9655d2697312a646 \
+    --hash=sha256:1d609f577dc6e1aa17d746f8bd3c31aa4d258f4070d61b2aa5c4166c1539de35 \
+    --hash=sha256:1f2ade76b9903f39aa442b4aadd2177decb66525062db244b35d71d0ee8599b6 \
+    --hash=sha256:20dca64a3ef2d6e4d5d615a3fd418ad3bde77a47ec8a23d984a12b5b4c74491a \
+    --hash=sha256:2a7d351cbd8cfeb19ca00de495e224dea7e7d919659c2841bbb7f420ad03e2d6 \
+    --hash=sha256:2d7d807855b419fc2ed3e631034685db6079889a1f01d5d9dac950f764da3dad \
+    --hash=sha256:2ef54abee730b502252bcdf31b10dacb0a416229b72c18b19e24a4509f273d26 \
+    --hash=sha256:36bc903cbb393720fad60fc28c10de6acf10dc6cc883f3e24ee4012371399a38 \
+    --hash=sha256:37205cac2a79194e3750b0af2a5720d95f786a55ce7df90c3af697bfa100eaac \
+    --hash=sha256:3c112550557578c26af18a1ccc9e090bfe03832ae994343cfdacd287db6a6ae7 \
+    --hash=sha256:3dd007d54ee88b46be476e293f48c85048603f5f516008bee124ddd891398ed6 \
+    --hash=sha256:4296f2b1ce8c86a6aea78613c34bb1a672ea0e3de9c6ba08a960efe0b0a09047 \
+    --hash=sha256:47ab1e7b91c098ab893b828deafa1203de86d0bc6ab587b160f78fe6c4011f75 \
+    --hash=sha256:49e3ceeabbfb9d66c3aef5af3a60cc43b85c33df25ce03d0031a608b0a8b2e3f \
+    --hash=sha256:4dc8f9fb58f7364b63fd9f85013b780ef83c11857ae79f2feda41e270468dd9b \
+    --hash=sha256:4efca8f86c54b22348a5467704e3fec767b2db12fc39c6d963168ab1d3fc9135 \
+    --hash=sha256:53edb4da6925ad13c07b6d26c2a852bd81e364f95301c66e930ab2aef5b5ddd8 \
+    --hash=sha256:5855f8438a7d1d458206a2466bf82b0f104a3724bf96a1c781ab731e4201731a \
+    --hash=sha256:594c67807fb16238b30c44bdf74f36c02cdf22d1c8cda91ef8a0ed8dabf5620a \
+    --hash=sha256:5b6d930f030f8ed98e3e6c98ffa0652bdb82601e7a016ec2ab5d7ff23baa78d1 \
+    --hash=sha256:5bb28c636d87e840583ee3adeb78172efc47c8b26127267f54a9c0ec251d41a9 \
+    --hash=sha256:60bf42e36abfaf9aff1f50f52644b336d4f0a3fd6d8a60ca0d054ac9f713a864 \
+    --hash=sha256:611d1ad9a4288cf3e3c16014564df047fe08410e628f89805e475368bd304914 \
+    --hash=sha256:6300b8454aa6930a24b9618fbb54b5a68135092bc666f7b06901f897fa5c2fee \
+    --hash=sha256:63f3268ba69ace99cab4e3e3b5840b03340efed0948ab8f78d2fd87ee5442a4f \
+    --hash=sha256:6557b31b5e2c9ddf0de32a691f2312a32f77cd7681d8af66c2692efdbef84c18 \
+    --hash=sha256:693ce3f9e70a6cf7d2fb9e6c9d8b204b6b39897a2c4a1aa65728d5ac97dcc1d8 \
+    --hash=sha256:6a7fae0dd14cf60ad5ff42baa2e95727c3d81ded453457771d02b7d2b3f9c0c2 \
+    --hash=sha256:6c4ca60fa24e85fe25b912b01e62cb969d69a23a5d5867682dd3e80b5b02581d \
+    --hash=sha256:6fcf051089389abe060c9cd7caa212c707e58153afa2c649f00346ce6d260f1b \
+    --hash=sha256:7d91275b0245b1da4d4cfa07e0faedd5b0812efc15b702576d103293e252af1b \
+    --hash=sha256:89c687013cb1cd489a0f0ac24febe8c7a666e6e221b783e53ac50ebf68e45d86 \
+    --hash=sha256:8d206346619592c6200148b01a2142798c989edcb9c896f9ac9722a99d4e77e6 \
+    --hash=sha256:905fec760bd2fa1388bb5b489ee8ee5f7291d692638ea5f67982d968366bef9f \
+    --hash=sha256:97383d78eb34da7e1fa37dd273c20ad4320929af65d156e35a5e2d89566d9dfb \
+    --hash=sha256:984d76483eb32f1bcb536dc27e4ad56bba4baa70be32fa87152832cdd9db0833 \
+    --hash=sha256:99df47edb6bda1249d3e80fdabb1dab8c08ef3975f69aed437cb69d0a5de1e28 \
+    --hash=sha256:9f02365d4e99430a12647f09b6cc8bab61a6564363f313126f775eb4f6ef798e \
+    --hash=sha256:a30e67a65b53ea0a5e62fe23682cfe22712e01f453b95233b25502f7c61cb415 \
+    --hash=sha256:ab3ef638ace319fa26553db0624c4699e31a28bb2a835c5faca8f8acf6a5a902 \
+    --hash=sha256:aca6377c0cb8a8253e493c6b451565ac77e98c2951c45f913e0b52facdcff83f \
+    --hash=sha256:add36cb2dbb8b736611303cd3bfcee00afd96471b09cda130da3581cbdc56a6d \
+    --hash=sha256:b2f4bf27480f5e5e8ce285a8c8fd176c0b03e93dcc6646477d4630e83440c6a9 \
+    --hash=sha256:b7f2d075102dc8c794cbde1947378051c4e5180d52d276987b8d28a3bd58c17d \
+    --hash=sha256:baa1a4e8f868845af802979fcdbf0bb11f94f1cb7ced4c4b8a351bb60d108145 \
+    --hash=sha256:be98f628055368795d818ebf93da628541e10b75b41c559fdf36d104c5787066 \
+    --hash=sha256:bf5d821ffabf0ef3533c39c518f3357b171a1651c1ff6827325e4489b0e46c3c \
+    --hash=sha256:c47adbc92fc1bb2b3274c4b3a43ae0e4573d9fbff4f54cd484555edbf030baf1 \
+    --hash=sha256:cdfba22ea2f0029c9261a4bd07e830a8da012291fbe44dc794e488b6c9bb353a \
+    --hash=sha256:d6c7ebd4e944c85e2c3421e612a7057a2f48d478d79e61800d81468a8d842207 \
+    --hash=sha256:d7f9850398e85aba693bb640262d3611788b1f29a79f0c93c565694658f4071f \
+    --hash=sha256:d8446c54dc28c01e5a2dbac5a25f071f6653e6e40f3a8818e8b45d790fe6ef53 \
+    --hash=sha256:deb993cacb280823246a026e3b2d81c493c53de6acfd5e6bfe31ab3402bb37dd \
+    --hash=sha256:e0f138900af21926a02425cf736db95be9f4af72ba1bb21453432a07f6082134 \
+    --hash=sha256:e9936f0b261d4df76ad22f8fee3ae83b60d7c3e871292cd42f40b81b70afae85 \
+    --hash=sha256:f0567c4dc99f264f49fe27da5f735f414c4e7e7dd850cfd8e69f0862d7c74ea9 \
+    --hash=sha256:f5653a225f31e113b152e56f154ccbe59eeb1c7487b39b9d9f9cdb58e6c79dc5 \
+    --hash=sha256:f826e31d18b516f653fe296d967d700fddad5901ae07c622bb3705955e1faa94 \
+    --hash=sha256:f8ba0e8349a38d3001fae7eadded3f6606f0da5d748ee53cc1dab1d6527b9509 \
+    --hash=sha256:f9081981fe268bd86831e5c75f7de206ef275defcb82bc70740ae6dc507aee51 \
+    --hash=sha256:fa130dd50c57d53368c9d59395cb5526eda596d3ffe36666cd81a44d56e48872
+    # via
+    #   -r ./tools/lint/rst/requirements.in
+    #   jinja2
+packaging==20.9 \
+    --hash=sha256:5b327ac1320dc863dca72f4514ecc086f31186744b84a230374cc1fd776feae5 \
+    --hash=sha256:67714da7f7bc052e064859c05c595155bd1ee9f69f76557e21f051443c20947a
+    # via
+    #   -r ./tools/lint/rst/requirements.in
+    #   sphinx
+pygments==2.14.0 \
+    --hash=sha256:b3ed06a9e8ac9a9aae5a6f5dbe78a8a58655d17b43b93c078f094ddc476ae297 \
+    --hash=sha256:fa7bd7bd2771287c0de303af8bfdfc731f51bd2c6a47ab69d117138893b82717
+    # via
+    #   -r ./tools/lint/rst/requirements.in
+    #   sphinx
+pyparsing==3.0.9 \
+    --hash=sha256:2b020ecf7d21b687f219b71ecad3631f644a47f01403fa1d1036b0c6416d70fb \
+    --hash=sha256:5026bae9a10eeaefb61dab2f09052b9f4307d44aee4eda64b309723d8d206bbc
+    # via packaging
+pytz==2022.7.1 \
+    --hash=sha256:01a0681c4b9684a28304615eba55d1ab31ae00bf68ec157ec3708a8182dbbcd0 \
+    --hash=sha256:78f4f37d8198e0627c5f1143240bb0206b8691d8d7ac6d78fee88b78733f8c4a
+    # via -r ./tools/lint/rst/requirements.in
+requests==2.27.1 \
+    --hash=sha256:68d7c56fd5a8999887728ef304a6d12edc7be74f1cfa47714fc8b414525c9a61 \
+    --hash=sha256:f22fa1e554c9ddfd16e6e41ac79759e17be9e492b3587efa038054674760e72d
+    # via
+    #   -r ./tools/lint/rst/requirements.in
+    #   sphinx
+rstcheck==3.5.0 \
+    --hash=sha256:30c36768c4bd617a85ab93c31facaf410582e53803fde624845eb00c1430070c \
+    --hash=sha256:d4b035300b7d898403544f38c3a4980171ce85f487d25e188347bbafb6ee58c0
+    # via -r ./tools/lint/rst/requirements.in
+snowballstemmer==2.2.0 \
+    --hash=sha256:09b16deb8547d3412ad7b590689584cd0fe25ec8db3be37788be3810cbf19cb1 \
+    --hash=sha256:c8e1716e83cc398ae16824e5572ae04e0d9fc2c6b985fb0f900f5f0c96ecba1a
+    # via
+    #   -r ./tools/lint/rst/requirements.in
+    #   sphinx
+sphinx==5.1.1 \
+    --hash=sha256:309a8da80cb6da9f4713438e5b55861877d5d7976b69d87e336733637ea12693 \
+    --hash=sha256:ba3224a4e206e1fbdecf98a4fae4992ef9b24b85ebf7b584bb340156eaf08d89
+    # via -r ./tools/lint/rst/requirements.in
+sphinxcontrib-applehelp==1.0.2 \
+    --hash=sha256:806111e5e962be97c29ec4c1e7fe277bfd19e9652fb1a4392105b43e01af885a \
+    --hash=sha256:a072735ec80e7675e3f432fcae8610ecf509c5f1869d17e2eecff44389cdbc58
+    # via
+    #   -r ./tools/lint/rst/requirements.in
+    #   sphinx
+sphinxcontrib-devhelp==1.0.2 \
+    --hash=sha256:8165223f9a335cc1af7ffe1ed31d2871f325254c0423bc0c4c7cd1c1e4734a2e \
+    --hash=sha256:ff7f1afa7b9642e7060379360a67e9c41e8f3121f2ce9164266f61b9f4b338e4
+    # via sphinx
+sphinxcontrib-htmlhelp==2.0.0 \
+    --hash=sha256:d412243dfb797ae3ec2b59eca0e52dac12e75a241bf0e4eb861e450d06c6ed07 \
+    --hash=sha256:f5f8bb2d0d629f398bf47d0d69c07bc13b65f75a81ad9e2f71a63d4b7a2f6db2
+    # via
+    #   -r ./tools/lint/rst/requirements.in
+    #   sphinx
+sphinxcontrib-jsmath==1.0.1 \
+    --hash=sha256:2ec2eaebfb78f3f2078e73666b1415417a116cc848b72e5172e596c871103178 \
+    --hash=sha256:a9925e4a4587247ed2191a22df5f6970656cb8ca2bd6284309578f2153e0c4b8
+    # via sphinx
+sphinxcontrib-mermaid==0.8.1 \
+    --hash=sha256:15491c24ec78cf1626b1e79e797a9ce87cb7959cf38f955eb72dd5512aeb6ce9 \
+    --hash=sha256:fa3e5325d4ba395336e6137d113f55026b1a03ccd115dc54113d1d871a580466
+    # via -r ./tools/lint/rst/requirements.in
+sphinxcontrib-qthelp==1.0.3 \
+    --hash=sha256:4c33767ee058b70dba89a6fc5c1892c0d57a54be67ddd3e7875a18d14cba5a72 \
+    --hash=sha256:bd9fc24bcb748a8d51fd4ecaade681350aa63009a347a8c14e637895444dfab6
+    # via sphinx
+sphinxcontrib-serializinghtml==1.1.5 \
+    --hash=sha256:352a9a00ae864471d3a7ead8d7d79f5fc0b57e8b3f95e9867eb9eb28999b92fd \
+    --hash=sha256:aa5f6de5dfdf809ef505c4895e51ef5c9eac17d0f287933eb49ec495280b6952
+    # via sphinx
+urllib3==1.26.9 \
+    --hash=sha256:44ece4d53fb1706f667c9bd1c648f5469a2ec925fcf3a776667042d645472c14 \
+    --hash=sha256:aabaf16477806a5e1dd19aa41f8c2b7950dd3c746362d7e3223dbe6de6ac448e
+    # via
+    #   -r ./tools/lint/rst/requirements.in
+    #   requests
+zipp==3.15.0 \
+    --hash=sha256:112929ad649da941c23de50f356a2b5570c954b65150642bccdd66bf194d224b \
+    --hash=sha256:48904fc76a60e542af151aded95726c1a5c34ed43ab4134b597665c86d7ad556
+    # via importlib-metadata
diff --git a/tools/lint/ruff.yml b/tools/lint/ruff.yml
new file mode 100644
index 0000000000..59ae2a1350
--- /dev/null
+++ b/tools/lint/ruff.yml
@@ -0,0 +1,17 @@
+---
+ruff:
+    description: An extremely fast Python linter, written in Rust
+    # Excludes should be added to topsrcdir/pyproject.toml
+    exclude: []
+    # The configure option is used by the build system
+    extensions: ["configure", "py"]
+    support-files:
+        - "**/.ruff.toml"
+        - "**/ruff.toml"
+        - "**/pyproject.toml"
+        - "tools/lint/python/ruff.py"
+    # Rules that should result in warnings rather than errors.
+    warning-rules: [PLR, PLW]
+    type: external
+    payload: python.ruff:lint
+    setup: python.ruff:setup
diff --git a/tools/lint/rust/__init__.py b/tools/lint/rust/__init__.py
new file mode 100644
index 0000000000..4f63930b49
--- /dev/null
+++ b/tools/lint/rust/__init__.py
@@ -0,0 +1,180 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import re
+import signal
+import subprocess
+from collections import namedtuple
+
+import six
+from mozboot.util import get_tools_dir
+from mozfile import which
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+from mozprocess import ProcessHandler
+from packaging.version import Version
+
+RUSTFMT_NOT_FOUND = """
+Could not find rustfmt! Install rustfmt and try again.
+
+    $ rustup component add rustfmt
+
+And make sure that it is in the PATH
+""".strip()
+
+
+RUSTFMT_INSTALL_ERROR = """
+Unable to install correct version of rustfmt
+Try to install it manually with:
+    $ rustup component add rustfmt
+""".strip()
+
+
+RUSTFMT_WRONG_VERSION = """
+You are probably using an old version of rustfmt.
+Expected version is {version}.
+Try to update it:
+    $ rustup update stable
+""".strip()
+
+
+def parse_issues(config, output, paths):
+    RustfmtDiff = namedtuple("RustfmtDiff", ["file", "line", "diff"])
+    issues = []
+    diff_line = re.compile("^Diff in (.*) at line ([0-9]*):")
+    file = ""
+    line_no = 0
+    diff = ""
+    for line in output:
+        line = six.ensure_text(line)
+        match = diff_line.match(line)
+        if match:
+            if diff:
+                issues.append(RustfmtDiff(file, line_no, diff.rstrip("\n")))
+                diff = ""
+            file, line_no = match.groups()
+        else:
+            diff += line + "\n"
+    # the algorithm above will always skip adding the last issue
+    issues.append(RustfmtDiff(file, line_no, diff))
+    file = os.path.normcase(os.path.normpath(file))
+    results = []
+    for issue in issues:
+        # rustfmt can not be supplied the paths to the files we want to analyze
+        # therefore, for each issue detected, we check if any of the the paths
+        # supplied are part of the file name.
+        # This just filters out the issues that are not part of paths.
+        if any([os.path.normcase(os.path.normpath(path)) in file for path in paths]):
+            res = {
+                "path": issue.file,
+                "diff": issue.diff,
+                "level": "warning",
+                "lineno": issue.line,
+            }
+            results.append(result.from_config(config, **res))
+    return {"results": results, "fixed": 0}
+
+
+class RustfmtProcess(ProcessHandler):
+    def __init__(self, config, *args, **kwargs):
+        self.config = config
+        kwargs["stream"] = False
+        ProcessHandler.__init__(self, *args, **kwargs)
+
+    def run(self, *args, **kwargs):
+        orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+        ProcessHandler.run(self, *args, **kwargs)
+        signal.signal(signal.SIGINT, orig)
+
+
+def run_process(config, cmd):
+    proc = RustfmtProcess(config, cmd)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+    return proc.output
+
+
+def get_rustfmt_binary():
+    """
+    Returns the path of the first rustfmt binary available
+    if not found returns None
+    """
+    binary = os.environ.get("RUSTFMT")
+    if binary:
+        return binary
+
+    rust_path = os.path.join(get_tools_dir(), "rustc", "bin")
+    return which("rustfmt", path=os.pathsep.join([rust_path, os.environ["PATH"]]))
+
+
+def get_rustfmt_version(binary):
+    """
+    Returns found binary's version
+    """
+    try:
+        output = subprocess.check_output(
+            [binary, "--version"],
+            stderr=subprocess.STDOUT,
+            universal_newlines=True,
+        )
+    except subprocess.CalledProcessError as e:
+        output = e.output
+
+    version = re.findall(r"\d.\d+.\d+", output)[0]
+    return Version(version)
+
+
+def lint(paths, config, fix=None, **lintargs):
+    log = lintargs["log"]
+    paths = list(expand_exclusions(paths, config, lintargs["root"]))
+
+    # An empty path array can occur when the user passes in `-n`. If we don't
+    # return early in this case, rustfmt will attempt to read stdin and hang.
+    if not paths:
+        return []
+
+    binary = get_rustfmt_binary()
+
+    if not binary:
+        print(RUSTFMT_NOT_FOUND)
+        if "MOZ_AUTOMATION" in os.environ:
+            return 1
+        return []
+
+    min_version_str = config.get("min_rustfmt_version")
+    min_version = Version(min_version_str)
+    actual_version = get_rustfmt_version(binary)
+    log.debug(
+        "Found version: {}. Minimal expected version: {}".format(
+            actual_version, min_version
+        )
+    )
+
+    if actual_version < min_version:
+        print(RUSTFMT_WRONG_VERSION.format(version=min_version_str))
+        return 1
+
+    cmd_args = [binary]
+    cmd_args.append("--check")
+    base_command = cmd_args + paths
+    log.debug("Command: {}".format(" ".join(cmd_args)))
+    output = run_process(config, base_command)
+
+    issues = parse_issues(config, output, paths)
+
+    if fix:
+        issues["fixed"] = len(issues["results"])
+        issues["results"] = []
+        cmd_args.remove("--check")
+
+        base_command = cmd_args + paths
+        log.debug("Command: {}".format(" ".join(cmd_args)))
+        output = run_process(config, base_command)
+
+    return issues
diff --git a/tools/lint/rustfmt.yml b/tools/lint/rustfmt.yml
new file mode 100644
index 0000000000..4fcd952a9b
--- /dev/null
+++ b/tools/lint/rustfmt.yml
@@ -0,0 +1,20 @@
+---
+rust:
+    description: Reformat rust
+    min_rustfmt_version: 1.4.12
+    include:
+        - '.'
+    exclude:
+        - dom/webauthn/libudev-sys/
+        - gfx/wr/peek-poke/
+        - gfx/wr/webrender_build/
+        - gfx/wr/wr_malloc_size_of/
+        - media/mp4parse-rust/
+        - servo/
+        - '**/*.mako.rs'
+    extensions:
+        - rs
+    support-files:
+        - 'tools/lint/rust/**'
+    type: external
+    payload: rust:lint
diff --git a/tools/lint/shell/__init__.py b/tools/lint/shell/__init__.py
new file mode 100644
index 0000000000..b75dc2d159
--- /dev/null
+++ b/tools/lint/shell/__init__.py
@@ -0,0 +1,148 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import os
+from json.decoder import JSONDecodeError
+
+import mozpack.path as mozpath
+from mozfile import which
+from mozlint import result
+from mozlint.util.implementation import LintProcess
+from mozpack.files import FileFinder
+
+SHELLCHECK_NOT_FOUND = """
+Unable to locate shellcheck, please ensure it is installed and in
+your PATH or set the SHELLCHECK environment variable.
+
+https://shellcheck.net or your system's package manager.
+""".strip()
+
+results = []
+
+
+class ShellcheckProcess(LintProcess):
+    def process_line(self, line):
+        try:
+            data = json.loads(line)
+        except JSONDecodeError as e:
+            print("Unable to load shellcheck output ({}): {}".format(e, line))
+            return
+
+        for entry in data:
+            res = {
+                "path": entry["file"],
+                "message": entry["message"],
+                "level": "error",
+                "lineno": entry["line"],
+                "column": entry["column"],
+                "rule": entry["code"],
+            }
+            results.append(result.from_config(self.config, **res))
+
+
+def determine_shell_from_script(path):
+    """Returns a string identifying the shell used.
+
+    Returns None if not identifiable.
+
+    Copes with the following styles:
+    #!bash
+    #!/bin/bash
+    #!/usr/bin/env bash
+    """
+    with open(path, "r") as f:
+        head = f.readline()
+
+        if not head.startswith("#!"):
+            return
+
+        # allow for parameters to the shell
+        shebang = head.split()[0]
+
+        # if the first entry is a variant of /usr/bin/env
+        if "env" in shebang:
+            shebang = head.split()[1]
+
+        if shebang.endswith("sh"):
+            # Strip first to avoid issues with #!bash
+            return shebang.strip("#!").split("/")[-1]
+    # make it clear we return None, rather than fall through.
+    return
+
+
+def find_shell_scripts(config, paths):
+    found = dict()
+
+    root = config["root"]
+    exclude = [mozpath.join(root, e) for e in config.get("exclude", [])]
+
+    if config.get("extensions"):
+        pattern = "**/*.{}".format(config.get("extensions")[0])
+    else:
+        pattern = "**/*.sh"
+
+    files = []
+    for path in paths:
+        path = mozpath.normsep(path)
+        ignore = [
+            e[len(path) :].lstrip("/")
+            for e in exclude
+            if mozpath.commonprefix((path, e)) == path
+        ]
+        finder = FileFinder(path, ignore=ignore)
+        files.extend([os.path.join(path, p) for p, f in finder.find(pattern)])
+
+    for filename in files:
+        shell = determine_shell_from_script(filename)
+        if shell:
+            found[filename] = shell
+    return found
+
+
+def run_process(config, cmd):
+    proc = ShellcheckProcess(config, cmd)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+
+def get_shellcheck_binary():
+    """
+    Returns the path of the first shellcheck binary available
+    if not found returns None
+    """
+    binary = os.environ.get("SHELLCHECK")
+    if binary:
+        return binary
+
+    return which("shellcheck")
+
+
+def lint(paths, config, **lintargs):
+    log = lintargs["log"]
+    binary = get_shellcheck_binary()
+
+    if not binary:
+        print(SHELLCHECK_NOT_FOUND)
+        if "MOZ_AUTOMATION" in os.environ:
+            return 1
+        return []
+
+    config["root"] = lintargs["root"]
+
+    files = find_shell_scripts(config, paths)
+
+    base_command = [binary, "-f", "json"]
+    if config.get("excludecodes"):
+        base_command.extend(["-e", ",".join(config.get("excludecodes"))])
+
+    for f in files:
+        cmd = list(base_command)
+        cmd.extend(["-s", files[f], f])
+        log.debug("Command: {}".format(cmd))
+        run_process(config, cmd)
+    return results
diff --git a/tools/lint/shellcheck.yml b/tools/lint/shellcheck.yml
new file mode 100644
index 0000000000..0100e3d5cc
--- /dev/null
+++ b/tools/lint/shellcheck.yml
@@ -0,0 +1,15 @@
+---
+shellcheck:
+    description: Shell script linter
+    include:
+        - extensions/spellcheck/locales/en-US/hunspell/dictionary-sources/
+        - taskcluster/docker/
+    exclude: []
+    # 1090: https://github.com/koalaman/shellcheck/wiki/SC1090
+    # 'Can't follow a non-constant source'
+    extensions: ['sh']
+    support-files:
+        - 'tools/lint/shell/**'
+    excludecodes: ['1090', '1091']
+    type: external
+    payload: shell:lint
diff --git a/tools/lint/spell/__init__.py b/tools/lint/spell/__init__.py
new file mode 100644
index 0000000000..65712acdd7
--- /dev/null
+++ b/tools/lint/spell/__init__.py
@@ -0,0 +1,168 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import re
+import subprocess
+
+# py2-compat
+try:
+    from json.decoder import JSONDecodeError
+except ImportError:
+    JSONDecodeError = ValueError
+
+from mozfile import which
+from mozlint import result
+from mozlint.util.implementation import LintProcess
+
+here = os.path.abspath(os.path.dirname(__file__))
+CODESPELL_REQUIREMENTS_PATH = os.path.join(here, "codespell_requirements.txt")
+
+CODESPELL_NOT_FOUND = """
+Could not find codespell! Install codespell and try again.
+
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    CODESPELL_REQUIREMENTS_PATH
+)
+
+
+CODESPELL_INSTALL_ERROR = """
+Unable to install correct version of codespell
+Try to install it manually with:
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    CODESPELL_REQUIREMENTS_PATH
+)
+
+results = []
+
+CODESPELL_FORMAT_REGEX = re.compile(r"(.*):(.*): (.*) ==> (.*)$")
+
+
+class CodespellProcess(LintProcess):
+    fixed = 0
+    _fix = None
+
+    def process_line(self, line):
+        try:
+            match = CODESPELL_FORMAT_REGEX.match(line)
+            abspath, line, typo, correct = match.groups()
+        except AttributeError:
+            if "FIXED: " not in line:
+                print("Unable to match regex against output: {}".format(line))
+            return
+
+        if CodespellProcess._fix:
+            CodespellProcess.fixed += 1
+
+        # Ignore false positive like aParent (which would be fixed to apparent)
+        # See https://github.com/lucasdemarchi/codespell/issues/314
+        m = re.match(r"^[a-z][A-Z][a-z]*", typo)
+        if m:
+            return
+        res = {
+            "path": abspath,
+            "message": typo.strip() + " ==> " + correct,
+            "level": "error",
+            "lineno": line,
+        }
+        results.append(result.from_config(self.config, **res))
+
+
+def run_process(config, cmd):
+    proc = CodespellProcess(config, cmd)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+
+def get_codespell_binary():
+    """
+    Returns the path of the first codespell binary available
+    if not found returns None
+    """
+    binary = os.environ.get("CODESPELL")
+    if binary:
+        return binary
+
+    return which("codespell")
+
+
+def setup(root, **lintargs):
+    virtualenv_manager = lintargs["virtualenv_manager"]
+    try:
+        virtualenv_manager.install_pip_requirements(
+            CODESPELL_REQUIREMENTS_PATH, quiet=True
+        )
+    except subprocess.CalledProcessError:
+        print(CODESPELL_INSTALL_ERROR)
+        return 1
+
+
+def get_codespell_version(binary):
+    return subprocess.check_output(
+        [which("python"), binary, "--version"],
+        universal_newlines=True,
+        stderr=subprocess.STDOUT,
+    )
+
+
+def get_ignored_words_file(config):
+    config_root = os.path.dirname(config["path"])
+    return os.path.join(config_root, "spell", "exclude-list.txt")
+
+
+def lint(paths, config, fix=None, **lintargs):
+    log = lintargs["log"]
+    binary = get_codespell_binary()
+    if not binary:
+        print(CODESPELL_NOT_FOUND)
+        if "MOZ_AUTOMATION" in os.environ:
+            return 1
+        return []
+
+    config["root"] = lintargs["root"]
+
+    exclude_list = get_ignored_words_file(config)
+    cmd_args = [
+        which("python"),
+        binary,
+        "--disable-colors",
+        # Silence some warnings:
+        # 1: disable warnings about wrong encoding
+        # 2: disable warnings about binary file
+        # 4: shut down warnings about automatic fixes
+        #    that were disabled in dictionary.
+        "--quiet-level=7",
+        "--ignore-words=" + exclude_list,
+    ]
+
+    if "exclude" in config:
+        cmd_args.append("--skip=*.dic,{}".format(",".join(config["exclude"])))
+
+    log.debug("Command: {}".format(" ".join(cmd_args)))
+    log.debug("Version: {}".format(get_codespell_version(binary)))
+
+    if fix:
+        CodespellProcess._fix = True
+
+    base_command = cmd_args + paths
+    run_process(config, base_command)
+
+    if fix:
+        global results
+        results = []
+        cmd_args.append("--write-changes")
+        log.debug("Command: {}".format(" ".join(cmd_args)))
+        log.debug("Version: {}".format(get_codespell_version(binary)))
+        base_command = cmd_args + paths
+        run_process(config, base_command)
+        CodespellProcess.fixed = CodespellProcess.fixed - len(results)
+    else:
+        CodespellProcess.fixed = 0
+
+    return {"results": results, "fixed": CodespellProcess.fixed}
diff --git a/tools/lint/spell/codespell_requirements.in b/tools/lint/spell/codespell_requirements.in
new file mode 100644
index 0000000000..407f17489c
--- /dev/null
+++ b/tools/lint/spell/codespell_requirements.in
@@ -0,0 +1 @@
+codespell==2.2.4
diff --git a/tools/lint/spell/codespell_requirements.txt b/tools/lint/spell/codespell_requirements.txt
new file mode 100644
index 0000000000..d8f0be543b
--- /dev/null
+++ b/tools/lint/spell/codespell_requirements.txt
@@ -0,0 +1,10 @@
+#
+# This file is autogenerated by pip-compile with Python 3.11
+# by the following command:
+#
+#    pip-compile --generate-hashes tools/lint/spell/codespell_requirements.in
+#
+codespell==2.2.4 \
+    --hash=sha256:0b4620473c257d9cde1ff8998b26b2bb209a35c2b7489f5dc3436024298ce83a \
+    --hash=sha256:7d984b8130108e6f82524b7d09f8b7bf2fb1e398c5d4b37d9e2bd310145b3e29
+    # via -r tools/lint/spell/codespell_requirements.in
diff --git a/tools/lint/spell/exclude-list.txt b/tools/lint/spell/exclude-list.txt
new file mode 100644
index 0000000000..b5c0290882
--- /dev/null
+++ b/tools/lint/spell/exclude-list.txt
@@ -0,0 +1,23 @@
+cas
+optin
+aparent
+acount
+te
+wasn
+incrementall
+aare
+whats
+crate
+files'
+thru
+referer
+dur
+ue
+tring
+delink
+warmup
+aNumber
+falsy
+rduce
+complies
+ehr
diff --git a/tools/lint/stylelint.yml b/tools/lint/stylelint.yml
new file mode 100644
index 0000000000..b1b9c94dec
--- /dev/null
+++ b/tools/lint/stylelint.yml
@@ -0,0 +1,15 @@
+---
+stylelint:
+    description: CSS linter
+    # Stylelint infra handles its own path filtering, so just include cwd
+    include: ['.']
+    exclude: []
+    extensions: ['css', 'scss']
+    support-files:
+        - 'package.json'
+        - '**/.stylelintrc.js'
+        - '.stylelintignore'
+        - 'tools/lint/stylelint/**'
+    type: external
+    payload: stylelint:lint
+    setup: stylelint:setup
diff --git a/tools/lint/stylelint/__init__.py b/tools/lint/stylelint/__init__.py
new file mode 100644
index 0000000000..96fa9428e6
--- /dev/null
+++ b/tools/lint/stylelint/__init__.py
@@ -0,0 +1,187 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import os
+import re
+import signal
+import subprocess
+import sys
+
+sys.path.append(os.path.join(os.path.dirname(__file__), "eslint"))
+from eslint import setup_helper
+from mozbuild.nodeutil import find_node_executable
+from mozlint import result
+
+STYLELINT_ERROR_MESSAGE = """
+An error occurred running stylelint. Please check the following error messages:
+
+{}
+""".strip()
+
+STYLELINT_NOT_FOUND_MESSAGE = """
+Could not find stylelint!  We looked at the --binary option, at the STYLELINT
+environment variable, and then at your local node_modules path. Please install
+eslint, stylelint and needed plugins with:
+
+mach eslint --setup
+
+and try again.
+""".strip()
+
+FILE_EXT_REGEX = re.compile(r"\.[a-z0-9_]{2,10}$", re.IGNORECASE)
+
+
+def setup(root, **lintargs):
+    setup_helper.set_project_root(root)
+
+    if not setup_helper.check_node_executables_valid():
+        return 1
+
+    return setup_helper.eslint_maybe_setup()
+
+
+def lint(paths, config, binary=None, fix=None, rules=[], setup=None, **lintargs):
+    """Run stylelint."""
+    log = lintargs["log"]
+    setup_helper.set_project_root(lintargs["root"])
+    module_path = setup_helper.get_project_root()
+
+    modified_paths = []
+    exts = "*.(" + "|".join(config["extensions"]) + ")"
+    for path in paths:
+        filepath, fileext = os.path.splitext(path)
+        if fileext:
+            modified_paths += [path]
+        else:
+            modified_paths += [os.path.join(path, "**" + os.path.sep + exts)]
+
+    # Valid binaries are:
+    #  - Any provided by the binary argument.
+    #  - Any pointed at by the STYLELINT environmental variable.
+    #  - Those provided by |mach lint --setup|.
+
+    if not binary:
+        binary, _ = find_node_executable()
+
+    if not binary:
+        print(STYLELINT_NOT_FOUND_MESSAGE)
+        return 1
+
+    extra_args = lintargs.get("extra_args") or []
+    exclude_args = []
+    for path in config.get("exclude", []):
+        exclude_args.extend(
+            ["--ignore-pattern", os.path.relpath(path, lintargs["root"])]
+        )
+
+    # Default to $topsrcdir/.stylelintrc.js, but allow override in stylelint.yml
+    stylelint_rc = config.get("stylelint-rc", ".stylelintrc.js")
+
+    # First run Stylelint
+    cmd_args = (
+        [
+            binary,
+            os.path.join(
+                module_path, "node_modules", "stylelint", "bin", "stylelint.js"
+            ),
+            "--formatter",
+            "json",
+            "--allow-empty-input",
+            "--config",
+            os.path.join(lintargs["root"], stylelint_rc),
+        ]
+        + extra_args
+        + exclude_args
+        + modified_paths
+    )
+
+    if fix:
+        cmd_args.append("--fix")
+
+    log.debug("Stylelint command: {}".format(" ".join(cmd_args)))
+
+    result = run(cmd_args, config, fix)
+    if result == 1:
+        return result
+
+    return result
+
+
+def run(cmd_args, config, fix):
+    shell = False
+    if (
+        os.environ.get("MSYSTEM") in ("MINGW32", "MINGW64")
+        or "MOZILLABUILD" in os.environ
+    ):
+        # The stylelint binary needs to be run from a shell with msys
+        shell = True
+    encoding = "utf-8"
+
+    orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+    proc = subprocess.Popen(
+        cmd_args, shell=shell, stdout=subprocess.PIPE, stderr=subprocess.PIPE
+    )
+    signal.signal(signal.SIGINT, orig)
+
+    try:
+        output, errors = proc.communicate()
+    except KeyboardInterrupt:
+        proc.kill()
+        return {"results": [], "fixed": 0}
+
+    if errors:
+        errors = errors.decode(encoding, "replace")
+        print(STYLELINT_ERROR_MESSAGE.format(errors))
+
+    # 0 is success, 2 is there was at least 1 rule violation. Anything else
+    # is more serious.
+    if proc.returncode != 0 and proc.returncode != 2:
+        if proc.returncode == 78:
+            print("Stylelint reported an issue with its configuration file.")
+            print(output)
+        return 1
+
+    if not output:
+        return {"results": [], "fixed": 0}  # no output means success
+    output = output.decode(encoding, "replace")
+    try:
+        jsonresult = json.loads(output)
+    except ValueError:
+        print(STYLELINT_ERROR_MESSAGE.format(output))
+        return 1
+
+    results = []
+    fixed = 0
+    for obj in jsonresult:
+        errors = obj["warnings"] + obj["parseErrors"]
+        # This will return a number of fixed files, as that's the only thing
+        # stylelint gives us. Note that it also seems to sometimes list files
+        # like this where it finds nothing and fixes nothing. It's not clear
+        # why... but this is why we also check if we were even trying to fix
+        # anything.
+        if fix and not errors and not obj.get("ignored"):
+            fixed += 1
+
+        for err in errors:
+            msg = err.get("text")
+            if err.get("rule"):
+                # stylelint includes the rule id in the error message.
+                # All mozlint formatters that include the error message also already
+                # separately include the rule id, so that leads to duplication. Fix:
+                msg = msg.replace("(" + err.get("rule") + ")", "").strip()
+            err.update(
+                {
+                    "message": msg,
+                    "level": err.get("severity") or "error",
+                    "lineno": err.get("line") or 0,
+                    "path": obj["source"],
+                    "rule": err.get("rule") or "parseError",
+                }
+            )
+            results.append(result.from_config(config, **err))
+
+    return {"results": results, "fixed": fixed}
diff --git a/tools/lint/test-manifest-alpha.yml b/tools/lint/test-manifest-alpha.yml
new file mode 100644
index 0000000000..cd4761e4b6
--- /dev/null
+++ b/tools/lint/test-manifest-alpha.yml
@@ -0,0 +1,19 @@
+---
+test-manifest-alpha:
+    description: Mochitest manifest tests should be in alphabetical order.
+    exclude:
+        - "**/application.ini"
+        - "**/l10n.ini"
+        - "**/xpcshell.ini"
+        - "**/python.ini"
+        - "**/manifest.ini"
+        - dom/canvas/test/webgl-conf/mochitest-errata.ini
+        - python/mozbuild/mozbuild/test/backend/data
+        - testing/mozbase/manifestparser/tests
+        - testing/web-platform
+        - xpcom/tests/unit/data
+    extensions: ['ini']
+    type: external
+    payload: test-manifest-alpha:lint
+    support-files:
+        - 'tools/lint/test-manifest-alpha/error-level-manifests.yml'
diff --git a/tools/lint/test-manifest-alpha/__init__.py b/tools/lint/test-manifest-alpha/__init__.py
new file mode 100644
index 0000000000..87d6ce5c5d
--- /dev/null
+++ b/tools/lint/test-manifest-alpha/__init__.py
@@ -0,0 +1,77 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import difflib
+import os
+import sys
+
+import yaml
+from manifestparser import TestManifest
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+from mozpack import path as mozpath
+
+# Since this linter matches on all files with .ini extensions, we can omit
+# those extensions from this allowlist, which makes it easier to match
+# against variants like "mochitest-serviceworker.ini".
+FILENAME_ALLOWLIST = ["mochitest", "browser", "chrome", "a11y"]
+
+here = os.path.abspath(os.path.dirname(__file__))
+ERROR_LEVEL_MANIFESTS_PATH = os.path.join(here, "error-level-manifests.yml")
+
+
+def lint(paths, config, fix=None, **lintargs):
+    try:
+        with open(ERROR_LEVEL_MANIFESTS_PATH) as f:
+            error_level_manifests = yaml.safe_load(f)
+    except (IOError, ValueError) as e:
+        print("{}: error:\n  {}".format(ERROR_LEVEL_MANIFESTS_PATH, e), file=sys.stderr)
+        sys.exit(1)
+
+    topsrcdir = lintargs["root"]
+
+    results = []
+    file_names = list(expand_exclusions(paths, config, lintargs["root"]))
+
+    for file_name in file_names:
+        name = os.path.basename(file_name)
+        if not any(name.startswith(allowed) for allowed in FILENAME_ALLOWLIST):
+            continue
+
+        manifest = TestManifest(manifests=(file_name,), strict=False)
+
+        test_names = [test["name"] for test in manifest.tests]
+        sorted_test_names = sorted(test_names)
+
+        if test_names != sorted_test_names:
+            rel_file_path = mozpath.relpath(file_name, topsrcdir)
+            level = "warning"
+
+            if (mozpath.normsep(rel_file_path) in error_level_manifests) or (
+                any(
+                    mozpath.match(rel_file_path, e)
+                    for e in error_level_manifests
+                    if "*" in e
+                )
+            ):
+                level = "error"
+
+            diff_instance = difflib.Differ()
+            diff_result = diff_instance.compare(test_names, sorted_test_names)
+            diff_list = list(diff_result)
+
+            res = {
+                "path": rel_file_path,
+                "lineno": 0,
+                "column": 0,
+                "message": (
+                    "The mochitest test manifest is not in alphabetical order. "
+                    "Expected ordering: \n\n%s\n\n" % "\n".join(sorted_test_names)
+                ),
+                "level": level,
+                "diff": "\n".join(diff_list),
+            }
+            results.append(result.from_config(config, **res))
+
+    return {"results": results, "fixed": 0}
diff --git a/tools/lint/test-manifest-alpha/error-level-manifests.yml b/tools/lint/test-manifest-alpha/error-level-manifests.yml
new file mode 100644
index 0000000000..90c091a3b8
--- /dev/null
+++ b/tools/lint/test-manifest-alpha/error-level-manifests.yml
@@ -0,0 +1,7 @@
+---
+# This file contains a list of manifest files or directory patterns that have
+# have been put into alphabetical order already. Items in this list will
+# cause the test-manifest-alpha linter to use the Error level rather than
+# the Warning level.
+
+- browser/**
diff --git a/tools/lint/test-manifest-disable.yml b/tools/lint/test-manifest-disable.yml
new file mode 100644
index 0000000000..7d93889704
--- /dev/null
+++ b/tools/lint/test-manifest-disable.yml
@@ -0,0 +1,16 @@
+---
+no-comment-disable:
+    description: >
+      "Use 'disabled=<reason>' to disable a test instead of a
+      comment"
+    include: ['.']
+    exclude:
+        - "**/application.ini"
+        - "**/l10n.ini"
+        - dom/canvas/test/webgl-conf/mochitest-errata.ini
+        - testing/mozbase/manifestparser/tests
+        - testing/web-platform
+        - xpcom/tests/unit/data
+    extensions: ['ini']
+    type: regex
+    payload: ^[ \t]*(#|;)[ \t]*\[
diff --git a/tools/lint/test-manifest-skip-if.yml b/tools/lint/test-manifest-skip-if.yml
new file mode 100644
index 0000000000..7ad1bd717c
--- /dev/null
+++ b/tools/lint/test-manifest-skip-if.yml
@@ -0,0 +1,18 @@
+---
+multiline-skip-if:
+    description: Conditions joined by || should be on separate lines
+    hint: |
+        skip-if =
+            <condition one>  # reason
+            <condition two>  # reason
+    exclude:
+        - "**/application.ini"
+        - "**/l10n.ini"
+        - dom/canvas/test/webgl-conf/mochitest-errata.ini
+        - testing/mozbase/manifestparser/tests
+        - testing/web-platform
+        - xpcom/tests/unit/data
+    extensions: ['ini']
+    level: warning
+    type: regex
+    payload: '^\s*(skip|fail)-if\s*=[^(]*\|\|'
diff --git a/tools/lint/test/conftest.py b/tools/lint/test/conftest.py
new file mode 100644
index 0000000000..f8cf8a30b6
--- /dev/null
+++ b/tools/lint/test/conftest.py
@@ -0,0 +1,305 @@
+import logging
+import os
+import pathlib
+import sys
+from collections import defaultdict
+
+import pytest
+from mozbuild.base import MozbuildObject
+from mozlint.parser import Parser
+from mozlint.pathutils import findobject
+from mozlint.result import ResultSummary
+from mozlog.structuredlog import StructuredLogger
+from mozpack import path
+
+here = path.abspath(path.dirname(__file__))
+build = MozbuildObject.from_environment(cwd=here, virtualenv_name="python-test")
+
+lintdir = path.dirname(here)
+sys.path.insert(0, lintdir)
+logger = logging.getLogger("mozlint")
+
+
+def pytest_generate_tests(metafunc):
+    """Finds, loads and returns the config for the linter name specified by the
+    LINTER global variable in the calling module.
+
+    This implies that each test file (that uses this fixture) should only be
+    used to test a single linter. If no LINTER variable is defined, the test
+    will fail.
+    """
+    if "config" in metafunc.fixturenames:
+        if not hasattr(metafunc.module, "LINTER"):
+            pytest.fail(
+                "'config' fixture used from a module that didn't set the LINTER variable"
+            )
+
+        name = metafunc.module.LINTER
+        config_path = path.join(lintdir, "{}.yml".format(name))
+        parser = Parser(build.topsrcdir)
+        configs = parser.parse(config_path)
+        config_names = {config["name"] for config in configs}
+
+        marker = metafunc.definition.get_closest_marker("lint_config")
+        if marker:
+            config_name = marker.kwargs["name"]
+            if config_name not in config_names:
+                pytest.fail(f"lint config {config_name} not present in {name}.yml")
+            configs = [
+                config for config in configs if config["name"] == marker.kwargs["name"]
+            ]
+
+        ids = [config["name"] for config in configs]
+        metafunc.parametrize("config", configs, ids=ids)
+
+
+@pytest.fixture(scope="module")
+def root(request):
+    """Return the root directory for the files of the linter under test.
+
+    For example, with LINTER=flake8 this would be tools/lint/test/files/flake8.
+    """
+    if not hasattr(request.module, "LINTER"):
+        pytest.fail(
+            "'root' fixture used from a module that didn't set the LINTER variable"
+        )
+    return path.join(here, "files", request.module.LINTER)
+
+
+@pytest.fixture(scope="module")
+def paths(root):
+    """Return a function that can resolve file paths relative to the linter
+    under test.
+
+    Can be used like `paths('foo.py', 'bar/baz')`. This will return a list of
+    absolute paths under the `root` files directory.
+    """
+
+    def _inner(*paths):
+        if not paths:
+            return [root]
+        return [path.normpath(path.join(root, p)) for p in paths]
+
+    return _inner
+
+
+@pytest.fixture(autouse=True)
+def run_setup(config):
+    """Make sure that if the linter named in the LINTER global variable has a
+    setup function, it gets called before running the tests.
+    """
+    if "setup" not in config:
+        return
+
+    if config["name"] == "clang-format":
+        # Skip the setup for the clang-format linter, as it requires a Mach context
+        # (which we may not have if pytest is invoked directly).
+        return
+
+    log = logging.LoggerAdapter(
+        logger, {"lintname": config.get("name"), "pid": os.getpid()}
+    )
+
+    func = findobject(config["setup"])
+    func(
+        build.topsrcdir,
+        virtualenv_manager=build.virtualenv_manager,
+        virtualenv_bin_path=build.virtualenv_manager.bin_path,
+        log=log,
+    )
+
+
+@pytest.fixture
+def lint(config, root, request):
+    """Find and return the 'lint' function for the external linter named in the
+    LINTER global variable.
+
+    This will automatically pass in the 'config' and 'root' arguments if not
+    specified.
+    """
+
+    if hasattr(request.module, "fixed"):
+        request.module.fixed = 0
+
+    try:
+        func = findobject(config["payload"])
+    except (ImportError, ValueError):
+        pytest.fail(
+            "could not resolve a lint function from '{}'".format(config["payload"])
+        )
+
+    ResultSummary.root = root
+
+    def wrapper(paths, config=config, root=root, collapse_results=False, **lintargs):
+        logger.setLevel(logging.DEBUG)
+        lintargs["log"] = logging.LoggerAdapter(
+            logger, {"lintname": config.get("name"), "pid": os.getpid()}
+        )
+
+        results = func(paths, config, root=root, **lintargs)
+        if hasattr(request.module, "fixed") and isinstance(results, dict):
+            request.module.fixed += results["fixed"]
+
+        if isinstance(results, dict):
+            results = results["results"]
+
+        if isinstance(results, (list, tuple)):
+            results = sorted(results)
+
+        if not collapse_results:
+            return results
+
+        ret = defaultdict(list)
+        for r in results:
+            ret[r.relpath].append(r)
+        return ret
+
+    return wrapper
+
+
+@pytest.fixture
+def structuredlog_lint(config, root, logger=None):
+    """Find and return the 'lint' function for the external linter named in the
+    LINTER global variable. This variant of the lint function is for linters that
+    use the 'structuredlog' type.
+
+    This will automatically pass in the 'config' and 'root' arguments if not
+    specified.
+    """
+    try:
+        func = findobject(config["payload"])
+    except (ImportError, ValueError):
+        pytest.fail(
+            "could not resolve a lint function from '{}'".format(config["payload"])
+        )
+
+    ResultSummary.root = root
+
+    if not logger:
+        logger = structured_logger()
+
+    def wrapper(
+        paths,
+        config=config,
+        root=root,
+        logger=logger,
+        collapse_results=False,
+        **lintargs,
+    ):
+        lintargs["log"] = logging.LoggerAdapter(
+            logger, {"lintname": config.get("name"), "pid": os.getpid()}
+        )
+        results = func(paths, config, root=root, logger=logger, **lintargs)
+        if not collapse_results:
+            return results
+
+        ret = defaultdict(list)
+        for r in results:
+            ret[r.path].append(r)
+        return ret
+
+    return wrapper
+
+
+@pytest.fixture
+def global_lint(config, root, request):
+    try:
+        func = findobject(config["payload"])
+    except (ImportError, ValueError):
+        pytest.fail(
+            "could not resolve a lint function from '{}'".format(config["payload"])
+        )
+
+    ResultSummary.root = root
+
+    def wrapper(config=config, root=root, collapse_results=False, **lintargs):
+        logger.setLevel(logging.DEBUG)
+        lintargs["log"] = logging.LoggerAdapter(
+            logger, {"lintname": config.get("name"), "pid": os.getpid()}
+        )
+        results = func(config, root=root, **lintargs)
+        if hasattr(request.module, "fixed") and isinstance(results, dict):
+            request.module.fixed += results["fixed"]
+
+        if isinstance(results, dict):
+            results = results["results"]
+
+        if isinstance(results, (list, tuple)):
+            results = sorted(results)
+
+        if not collapse_results:
+            return results
+
+        ret = defaultdict(list)
+        for r in results:
+            ret[r.relpath].append(r)
+        return ret
+
+    return wrapper
+
+
+@pytest.fixture
+def create_temp_file(tmpdir):
+    def inner(contents, name=None):
+        name = name or "temp.py"
+        path = tmpdir.join(name)
+        path.write(contents)
+        return path.strpath
+
+    return inner
+
+
+@pytest.fixture
+def structured_logger():
+    return StructuredLogger("logger")
+
+
+@pytest.fixture
+def perfdocs_sample():
+    from test_perfdocs import (
+        DYNAMIC_SAMPLE_CONFIG,
+        SAMPLE_CONFIG,
+        SAMPLE_INI,
+        SAMPLE_TEST,
+        temp_dir,
+        temp_file,
+    )
+
+    with temp_dir() as tmpdir:
+        suite_dir = pathlib.Path(tmpdir, "suite")
+        raptor_dir = pathlib.Path(tmpdir, "raptor")
+        raptor_suitedir = pathlib.Path(tmpdir, "raptor", "suite")
+        raptor_another_suitedir = pathlib.Path(tmpdir, "raptor", "another_suite")
+        perfdocs_dir = pathlib.Path(tmpdir, "perfdocs")
+
+        perfdocs_dir.mkdir(parents=True, exist_ok=True)
+        suite_dir.mkdir(parents=True, exist_ok=True)
+        raptor_dir.mkdir(parents=True, exist_ok=True)
+        raptor_suitedir.mkdir(parents=True, exist_ok=True)
+        raptor_another_suitedir.mkdir(parents=True, exist_ok=True)
+
+        with temp_file(
+            "perftest.ini", tempdir=suite_dir, content="[perftest_sample.js]"
+        ) as tmpmanifest, temp_file(
+            "raptor_example1.ini", tempdir=raptor_suitedir, content=SAMPLE_INI
+        ) as tmpexample1manifest, temp_file(
+            "raptor_example2.ini", tempdir=raptor_another_suitedir, content=SAMPLE_INI
+        ) as tmpexample2manifest, temp_file(
+            "perftest_sample.js", tempdir=suite_dir, content=SAMPLE_TEST
+        ) as tmptest, temp_file(
+            "config.yml", tempdir=perfdocs_dir, content=SAMPLE_CONFIG
+        ) as tmpconfig, temp_file(
+            "config_2.yml", tempdir=perfdocs_dir, content=DYNAMIC_SAMPLE_CONFIG
+        ) as tmpconfig_2, temp_file(
+            "index.rst", tempdir=perfdocs_dir, content="{documentation}"
+        ) as tmpindex:
+            yield {
+                "top_dir": tmpdir,
+                "manifest": {"path": tmpmanifest},
+                "example1_manifest": tmpexample1manifest,
+                "example2_manifest": tmpexample2manifest,
+                "test": tmptest,
+                "config": tmpconfig,
+                "config_2": tmpconfig_2,
+                "index": tmpindex,
+            }
diff --git a/tools/lint/test/files/android-format/Bad.java b/tools/lint/test/files/android-format/Bad.java
new file mode 100644
index 0000000000..13aa5d49d5
--- /dev/null
+++ b/tools/lint/test/files/android-format/Bad.java
@@ -0,0 +1,8 @@
+package org.mozilla.geckoview;
+
+import java.util.Arrays;
+
+public class Bad {
+    public static void main() {
+    }
+}
diff --git a/tools/lint/test/files/android-format/Main.kt b/tools/lint/test/files/android-format/Main.kt
new file mode 100644
index 0000000000..a172cf71ee
--- /dev/null
+++ b/tools/lint/test/files/android-format/Main.kt
@@ -0,0 +1,7 @@
+package org.mozilla.geckoview
+
+import java.util.Arrays;
+
+fun main() {
+println("Hello")
+}
diff --git a/tools/lint/test/files/android-format/build.gradle b/tools/lint/test/files/android-format/build.gradle
new file mode 100644
index 0000000000..6d2aff6d60
--- /dev/null
+++ b/tools/lint/test/files/android-format/build.gradle
@@ -0,0 +1 @@
+buildDir "${topobjdir}/gradle/build/tools/lint/test/files/android-format"
diff --git a/tools/lint/test/files/black/bad.py b/tools/lint/test/files/black/bad.py
new file mode 100644
index 0000000000..0a50df4dd9
--- /dev/null
+++ b/tools/lint/test/files/black/bad.py
@@ -0,0 +1,6 @@
+# Any copyright is dedicated to the Public Domain.
+# http://creativecommons.org/publicdomain/zero/1.0/
+
+print (
+    "test"
+       )
diff --git a/tools/lint/test/files/black/invalid.py b/tools/lint/test/files/black/invalid.py
new file mode 100644
index 0000000000..079ecbad30
--- /dev/null
+++ b/tools/lint/test/files/black/invalid.py
@@ -0,0 +1,4 @@
+# Any copyright is dedicated to the Public Domain.
+# http://creativecommons.org/publicdomain/zero/1.0/
+
+print(
diff --git a/tools/lint/test/files/clang-format/bad/bad.cpp b/tools/lint/test/files/clang-format/bad/bad.cpp
new file mode 100644
index 0000000000..f08a83f795
--- /dev/null
+++ b/tools/lint/test/files/clang-format/bad/bad.cpp
@@ -0,0 +1,6 @@
+int  main ( ) { 
+
+return 0;   
+
+
+}
diff --git a/tools/lint/test/files/clang-format/bad/bad2.c b/tools/lint/test/files/clang-format/bad/bad2.c
new file mode 100644
index 0000000000..9792e85071
--- /dev/null
+++ b/tools/lint/test/files/clang-format/bad/bad2.c
@@ -0,0 +1,8 @@
+#include "bad2.h"
+
+
+int bad2() {
+  int a =2;
+  return a;
+
+}
diff --git a/tools/lint/test/files/clang-format/bad/bad2.h b/tools/lint/test/files/clang-format/bad/bad2.h
new file mode 100644
index 0000000000..a35d49d7e7
--- /dev/null
+++ b/tools/lint/test/files/clang-format/bad/bad2.h
@@ -0,0 +1 @@
+int bad2(void );
diff --git a/tools/lint/test/files/clang-format/bad/good.cpp b/tools/lint/test/files/clang-format/bad/good.cpp
new file mode 100644
index 0000000000..76e8197013
--- /dev/null
+++ b/tools/lint/test/files/clang-format/bad/good.cpp
@@ -0,0 +1 @@
+int main() { return 0; }
diff --git a/tools/lint/test/files/clang-format/good/foo.cpp b/tools/lint/test/files/clang-format/good/foo.cpp
new file mode 100644
index 0000000000..76e8197013
--- /dev/null
+++ b/tools/lint/test/files/clang-format/good/foo.cpp
@@ -0,0 +1 @@
+int main() { return 0; }
diff --git a/tools/lint/test/files/clippy/test1/Cargo.toml b/tools/lint/test/files/clippy/test1/Cargo.toml
new file mode 100644
index 0000000000..92d5072eca
--- /dev/null
+++ b/tools/lint/test/files/clippy/test1/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "hello_world" # the name of the package
+version = "0.1.0"    # the current version, obeying semver
+authors = ["Alice <a@example.com>", "Bob <b@example.com>"]
+
+[[bin]]
+name ="good"
+path = "good.rs"
+
+[[bin]]
+name ="bad"
+path = "bad.rs"
+
+[[bin]]
+name ="bad2"
+path = "bad2.rs"
+
diff --git a/tools/lint/test/files/clippy/test1/bad.rs b/tools/lint/test/files/clippy/test1/bad.rs
new file mode 100644
index 0000000000..c403fba603
--- /dev/null
+++ b/tools/lint/test/files/clippy/test1/bad.rs
@@ -0,0 +1,14 @@
+fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+    // Clippy detects this as a swap and considers this as an error
+    let mut a=1;
+    let mut b=1;
+
+    a = b;
+    b = a;
+
+
+}
diff --git a/tools/lint/test/files/clippy/test1/bad2.rs b/tools/lint/test/files/clippy/test1/bad2.rs
new file mode 100644
index 0000000000..bf488bbe72
--- /dev/null
+++ b/tools/lint/test/files/clippy/test1/bad2.rs
@@ -0,0 +1,14 @@
+fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+    let mut a;
+    let mut b=1;
+    let mut vec = vec![1, 2];
+
+    for x in 5..10 - 5 {
+        a = x;
+    }
+
+    }
diff --git a/tools/lint/test/files/clippy/test1/good.rs b/tools/lint/test/files/clippy/test1/good.rs
new file mode 100644
index 0000000000..9bcaee67b7
--- /dev/null
+++ b/tools/lint/test/files/clippy/test1/good.rs
@@ -0,0 +1,6 @@
+fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+}
diff --git a/tools/lint/test/files/clippy/test2/Cargo.lock b/tools/lint/test/files/clippy/test2/Cargo.lock
new file mode 100644
index 0000000000..6b2bc69eeb
--- /dev/null
+++ b/tools/lint/test/files/clippy/test2/Cargo.lock
@@ -0,0 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "hello_world_2"
+version = "0.2.0"
diff --git a/tools/lint/test/files/clippy/test2/Cargo.toml b/tools/lint/test/files/clippy/test2/Cargo.toml
new file mode 100644
index 0000000000..b0ac992088
--- /dev/null
+++ b/tools/lint/test/files/clippy/test2/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "hello_world_2" # the name of the package
+version = "0.2.0"    # the current version, obeying semver
+authors = ["Alice <a@example.com>", "Bob <b@example.com>"]
+
+[[bin]]
+name = "fake_lib1"
+path = "src/bad_1.rs"
diff --git a/tools/lint/test/files/clippy/test2/src/bad_1.rs b/tools/lint/test/files/clippy/test2/src/bad_1.rs
new file mode 100644
index 0000000000..2fe0630202
--- /dev/null
+++ b/tools/lint/test/files/clippy/test2/src/bad_1.rs
@@ -0,0 +1,15 @@
+mod bad_2;
+
+fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+    // Clippy detects this as a swap and considers this as an error
+    let mut a=1;
+    let mut b=1;
+
+    a = b;
+    b = a;
+
+}
diff --git a/tools/lint/test/files/clippy/test2/src/bad_2.rs b/tools/lint/test/files/clippy/test2/src/bad_2.rs
new file mode 100644
index 0000000000..f77de330b4
--- /dev/null
+++ b/tools/lint/test/files/clippy/test2/src/bad_2.rs
@@ -0,0 +1,17 @@
+fn foo() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+    let mut a;
+    let mut b=1;
+    let mut vec = Vec::new();
+    vec.push(1);
+    vec.push(2);
+
+
+    for x in 5..10 - 5 {
+        a = x;
+    }
+
+    }
diff --git a/tools/lint/test/files/codespell/ignore.rst b/tools/lint/test/files/codespell/ignore.rst
new file mode 100644
index 0000000000..1371d07054
--- /dev/null
+++ b/tools/lint/test/files/codespell/ignore.rst
@@ -0,0 +1,5 @@
+This is a file with some typos and informations.
+But also testing false positive like optin (because this isn't always option)
+or stuff related to our coding style like:
+aparent (aParent).
+but detects mistakes like mozila
diff --git a/tools/lint/test/files/eslint/good.js b/tools/lint/test/files/eslint/good.js
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tools/lint/test/files/eslint/import/bad_import.js b/tools/lint/test/files/eslint/import/bad_import.js
new file mode 100644
index 0000000000..e2a8ec8de1
--- /dev/null
+++ b/tools/lint/test/files/eslint/import/bad_import.js
@@ -0,0 +1 @@
+/* import-globals-from notpresent/notpresent.js */
diff --git a/tools/lint/test/files/eslint/nolint/foo.txt b/tools/lint/test/files/eslint/nolint/foo.txt
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tools/lint/test/files/eslint/subdir/bad.js b/tools/lint/test/files/eslint/subdir/bad.js
new file mode 100644
index 0000000000..9d2dd18f39
--- /dev/null
+++ b/tools/lint/test/files/eslint/subdir/bad.js
@@ -0,0 +1,2 @@
+// Missing semicolon
+let foo = "bar"
diff --git a/tools/lint/test/files/eslint/testprettierignore b/tools/lint/test/files/eslint/testprettierignore
new file mode 100644
index 0000000000..c2df665174
--- /dev/null
+++ b/tools/lint/test/files/eslint/testprettierignore
@@ -0,0 +1 @@
+# Intentionally empty file.
diff --git a/tools/lint/test/files/file-perm/maybe-shebang/bad.js b/tools/lint/test/files/file-perm/maybe-shebang/bad.js
new file mode 100755
index 0000000000..1a0b4c5fd6
--- /dev/null
+++ b/tools/lint/test/files/file-perm/maybe-shebang/bad.js
@@ -0,0 +1,2 @@
+# Nothing too
+
diff --git a/tools/lint/test/files/file-perm/maybe-shebang/good.js b/tools/lint/test/files/file-perm/maybe-shebang/good.js
new file mode 100755
index 0000000000..8149c0d4f3
--- /dev/null
+++ b/tools/lint/test/files/file-perm/maybe-shebang/good.js
@@ -0,0 +1,5 @@
+#!/usr/bin/env node
+
+
+# Nothing
+
diff --git a/tools/lint/test/files/file-perm/no-shebang/bad-shebang.c b/tools/lint/test/files/file-perm/no-shebang/bad-shebang.c
new file mode 100755
index 0000000000..7151678efa
--- /dev/null
+++ b/tools/lint/test/files/file-perm/no-shebang/bad-shebang.c
@@ -0,0 +1,2 @@
+#!/bin/bash
+int main() { return 0; }
diff --git a/tools/lint/test/files/file-perm/no-shebang/bad.c b/tools/lint/test/files/file-perm/no-shebang/bad.c
new file mode 100755
index 0000000000..76e8197013
--- /dev/null
+++ b/tools/lint/test/files/file-perm/no-shebang/bad.c
@@ -0,0 +1 @@
+int main() { return 0; }
diff --git a/tools/lint/test/files/file-perm/no-shebang/bad.png b/tools/lint/test/files/file-perm/no-shebang/bad.png
new file mode 100755
index 0000000000..db3a5fda7e
Binary files /dev/null and b/tools/lint/test/files/file-perm/no-shebang/bad.png differ
diff --git a/tools/lint/test/files/file-perm/no-shebang/good.c b/tools/lint/test/files/file-perm/no-shebang/good.c
new file mode 100644
index 0000000000..76e8197013
--- /dev/null
+++ b/tools/lint/test/files/file-perm/no-shebang/good.c
@@ -0,0 +1 @@
+int main() { return 0; }
diff --git a/tools/lint/test/files/file-whitespace/bad-newline.c b/tools/lint/test/files/file-whitespace/bad-newline.c
new file mode 100644
index 0000000000..3746a0add3
--- /dev/null
+++ b/tools/lint/test/files/file-whitespace/bad-newline.c
@@ -0,0 +1,3 @@
+int main() { return 0; }
+
+  
\ No newline at end of file
diff --git a/tools/lint/test/files/file-whitespace/bad-windows.c b/tools/lint/test/files/file-whitespace/bad-windows.c
new file mode 100644
index 0000000000..70d4c697b9
--- /dev/null
+++ b/tools/lint/test/files/file-whitespace/bad-windows.c
@@ -0,0 +1,3 @@
+int main(){
+	return 42;
+}
diff --git a/tools/lint/test/files/file-whitespace/bad.c b/tools/lint/test/files/file-whitespace/bad.c
new file mode 100644
index 0000000000..4309b1f55d
--- /dev/null
+++ b/tools/lint/test/files/file-whitespace/bad.c
@@ -0,0 +1,3 @@
+int main() { 
+return 0; 
+}
diff --git a/tools/lint/test/files/file-whitespace/bad.js b/tools/lint/test/files/file-whitespace/bad.js
new file mode 100644
index 0000000000..3441696ef1
--- /dev/null
+++ b/tools/lint/test/files/file-whitespace/bad.js
@@ -0,0 +1,3 @@
+# Nothing too 
+
+
diff --git a/tools/lint/test/files/file-whitespace/good.c b/tools/lint/test/files/file-whitespace/good.c
new file mode 100644
index 0000000000..76e8197013
--- /dev/null
+++ b/tools/lint/test/files/file-whitespace/good.c
@@ -0,0 +1 @@
+int main() { return 0; }
diff --git a/tools/lint/test/files/file-whitespace/good.js b/tools/lint/test/files/file-whitespace/good.js
new file mode 100644
index 0000000000..8149c0d4f3
--- /dev/null
+++ b/tools/lint/test/files/file-whitespace/good.js
@@ -0,0 +1,5 @@
+#!/usr/bin/env node
+
+
+# Nothing
+
diff --git a/tools/lint/test/files/fluent-lint/bad.ftl b/tools/lint/test/files/fluent-lint/bad.ftl
new file mode 100644
index 0000000000..ebc0e1a602
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/bad.ftl
@@ -0,0 +1,44 @@
+Blah-blah = Uppercase letters in identifiers are not permitted.
+blah-blah = This is a legal identifier.
+blah_blah = Underscores in identifiers are not permitted.
+
+bad-apostrophe-1 = The bee's knees
+bad-apostrophe-end-1 = The bees' knees
+bad-apostrophe-2 = The bee‘s knees
+bad-single-quote = 'The bee’s knees'
+ok-apostrophe = The bee’s knees
+ok-single-quote = ‘The bee’s knees’
+bad-double-quote = "The bee’s knees"
+good-double-quote = “The bee’s knees”
+bad-ellipsis = The bee’s knees...
+good-ellipsis = The bee’s knees…
+
+embedded-tag = Read more about <a data-l10n-name="privacy-policy"> our privacy policy </a>.
+bad-embedded-tag = Read more about <a data-l10n-name="privacy-policy"> our 'privacy' policy </a>.
+
+Invalid_Id = This identifier is in the exclusions file and will not cause an error.
+
+good-has-attributes =
+    .accessKey = Attribute identifiers are not checked.
+
+bad-has-attributes =
+    .accessKey = Attribute 'values' are checked.
+
+good-function-call = Last modified: { DATETIME($timeChanged, day: "numeric", month: "long", year: "numeric") }
+
+#   $engineName (String) - The engine name that will currently be used for the private window.
+good-variable-identifier = { $engineName } is your default search engine in Private Windows
+
+short-id = I am too short
+
+identifiers-in-selectors-should-be-ignored =
+  .label = { $tabCount ->
+      [1] Send Tab to Device
+      [UPPERCASE] Send Tab to Device
+     *[other] Send { $tabCount } Tabs to Device
+  }
+
+this-message-reference-is-ignored =
+    .label = { menu-quit.label }
+
+ok-message-with-html-and-var = This is a <a href="{ $url }">link</a>
diff --git a/tools/lint/test/files/fluent-lint/brand-names-excluded.ftl b/tools/lint/test/files/fluent-lint/brand-names-excluded.ftl
new file mode 100644
index 0000000000..9f3afa28b8
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/brand-names-excluded.ftl
@@ -0,0 +1,2 @@
+# Comment
+bad-firefox1 = Welcome to Firefox
diff --git a/tools/lint/test/files/fluent-lint/brand-names.ftl b/tools/lint/test/files/fluent-lint/brand-names.ftl
new file mode 100644
index 0000000000..c338d920ca
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/brand-names.ftl
@@ -0,0 +1,30 @@
+bad-firefox1 = Welcome to Firefox
+
+# Comment should be ignored when displaying the offset of the error
+bad-firefox2 = Welcome to Firefox again
+bad-firefox2b = <span>Welcome to Firefox<span> again
+bad-firefox3 = <b>Firefox</b>
+bad-firefox-excluded = <b>Firefox</b>
+
+bad-mozilla1 = Welcome to Mozilla
+bad-mozilla2 = Welcome to Mozilla again
+bad-mozilla2b = <span>Welcome to Mozilla</span> again
+bad-mozilla3 = <b>Mozilla</b>
+
+bad-thunderbird1 = Welcome to Thunderbird
+bad-thunderbird2 = <span>Welcome to Thunderbird</span> again
+bad-thunderbird3 = <b>Thunderbird</b>
+
+good-firefox1 = Welcome to { -brand-firefox }
+good-firefox2 = Welcome to { firefox-message }
+
+good-mozilla1 = Welcome to { -brand-mozilla }
+good-mozilla2 = Welcome to { mozilla-message }
+
+good-thunderbird1 = Welcome to { -brand-thunderbird }
+good-thunderbird2 = Welcome to { thunderbird-message }
+
+# There are no brand checks on terms
+-brand-firefox = Firefox
+
+bland-message = No brands here.
diff --git a/tools/lint/test/files/fluent-lint/comment-group1.ftl b/tools/lint/test/files/fluent-lint/comment-group1.ftl
new file mode 100644
index 0000000000..32c19dc441
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/comment-group1.ftl
@@ -0,0 +1,35 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+### Test group comments.
+
+fake-identifier-1 = Fake text
+
+## Pass: This group comment has proper spacing.
+
+fake-identifier-2 = Fake text
+## Fail: (GC03) Group comments should have an empty line before them.
+
+fake-identifier-3 = Fake text
+
+## Fail: (GC02) Group comments should have an empty line after them.
+fake-identifier-4 = Fake text
+
+## Pass: A single comment is fine.
+
+## Fail: (GC04) A group comment must be followed by at least one message.
+
+fake-identifier-5 = Fake text
+
+
+## Fail: (GC03) Only allow 1 line above.
+
+fake-identifier-6 = Fake text
+
+## Fail: (GC02) Only allow 1 line below.
+
+
+fake-identifier-6 = Fake text
+
+## Fail: (GC01) Group comments should not be at the end of a file.
diff --git a/tools/lint/test/files/fluent-lint/comment-group2.ftl b/tools/lint/test/files/fluent-lint/comment-group2.ftl
new file mode 100644
index 0000000000..47d29fa211
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/comment-group2.ftl
@@ -0,0 +1,15 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+### Test group comments.
+
+## Pass: This group comment is followed by a term
+
+-fake-term = Fake text
+
+## Pass: The last group comment is allowed to be an empty ##
+
+fake-identifier-1 = Fake text
+
+##
diff --git a/tools/lint/test/files/fluent-lint/comment-resource1.ftl b/tools/lint/test/files/fluent-lint/comment-resource1.ftl
new file mode 100644
index 0000000000..f5d5e53d59
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/comment-resource1.ftl
@@ -0,0 +1,11 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+### Pass: This is a resource comment with proper spacing.
+
+fake-identifier-1 = Fake text
+
+### Fail: (RC01) There should not be more than one resource comment
+
+fake-identifier-2 = Fake text
diff --git a/tools/lint/test/files/fluent-lint/comment-resource2.ftl b/tools/lint/test/files/fluent-lint/comment-resource2.ftl
new file mode 100644
index 0000000000..44a77f4e73
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/comment-resource2.ftl
@@ -0,0 +1,6 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+### Fail: (RC03) There should be an empty line preceeding.
+
+fake-identifier-1 = Fake text
diff --git a/tools/lint/test/files/fluent-lint/comment-resource3.ftl b/tools/lint/test/files/fluent-lint/comment-resource3.ftl
new file mode 100644
index 0000000000..b261404380
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/comment-resource3.ftl
@@ -0,0 +1,6 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+### Fail: (RC02) There should be an empty line following.
+fake-identifier-1 = Fake text
diff --git a/tools/lint/test/files/fluent-lint/comment-resource4.ftl b/tools/lint/test/files/fluent-lint/comment-resource4.ftl
new file mode 100644
index 0000000000..c24e8887f8
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/comment-resource4.ftl
@@ -0,0 +1,8 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+### Fail: (RC03) There should be only one space above.
+
+fake-identifier-1 = Fake text
diff --git a/tools/lint/test/files/fluent-lint/comment-resource5.ftl b/tools/lint/test/files/fluent-lint/comment-resource5.ftl
new file mode 100644
index 0000000000..60d8e8c264
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/comment-resource5.ftl
@@ -0,0 +1,8 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+### Fail: (RC02) There should be only one space below.
+
+
+fake-identifier-1 = Fake text
diff --git a/tools/lint/test/files/fluent-lint/comment-resource6.ftl b/tools/lint/test/files/fluent-lint/comment-resource6.ftl
new file mode 100644
index 0000000000..a2ca9abfe7
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/comment-resource6.ftl
@@ -0,0 +1,4 @@
+### Pass: Check two conditions.
+### 1. This is an edge case, but we shouldn't error if there is only a resource comment.
+### 2. Make sure this linter does not error if there is no license header. The license is
+###    checked with `mach lint license`.
diff --git a/tools/lint/test/files/fluent-lint/comment-variables1.ftl b/tools/lint/test/files/fluent-lint/comment-variables1.ftl
new file mode 100644
index 0000000000..10de9de195
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/comment-variables1.ftl
@@ -0,0 +1,60 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+### Test group comments.
+### $var doesn't count towards commented placeables
+
+message-without-comment = This string has a { $var }
+
+## Variables:
+## $foo-group (String): group level comment
+
+# Variables:
+# $foo1 (String): just text
+message-with-comment = This string has a { $foo1 }
+
+message-with-group-comment = This string has a { $foo-group }
+
+select-without-comment1 = {
+    $select1 ->
+        [t] Foo
+       *[s] Bar
+}
+
+select-without-comment2 = {
+    $select2 ->
+        [t] Foo { $select2 }
+       *[s] Bar
+}
+
+## Variables:
+## $select4 (Integer): a number
+
+# Variables:
+# $select3 (Integer): a number
+select-with-comment1 = {
+    $select3 ->
+        [t] Foo
+       *[s] Bar
+}
+
+select-with-group-comment1 = {
+    $select4 ->
+        [t] Foo { $select4 }
+       *[s] Bar
+}
+
+message-attribute-without-comment =
+    .label = This string as { $attr }
+
+# Variables:
+# $attr2 (String): just text
+message-attribute-with-comment =
+    .label = This string as { $attr2 }
+
+message-selection-function =
+  { PLATFORM() ->
+      [macos] foo
+     *[other] bar
+  }
diff --git a/tools/lint/test/files/fluent-lint/comment-variables2.ftl b/tools/lint/test/files/fluent-lint/comment-variables2.ftl
new file mode 100644
index 0000000000..2e9ae8e684
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/comment-variables2.ftl
@@ -0,0 +1,27 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+## Terms are not checked for variables, no need for comments.
+
+-term-without-comment1 = { $term1 }
+-term-without-comment2 = {
+    $select2 ->
+        [t] Foo { $term2 }
+       *[s] Bar
+}
+
+# Testing that variable references from terms are not kept around when analyzing
+# standard messages (see bug 1812568).
+#
+# Variables:
+# $message1 (String) - Just text
+message-with-comment = This string has a { $message1 }
+
+# This comment is not necessary, just making sure it doesn't get carried over to
+# the following message which uses the same variable.
+#
+# Variables:
+# $term-message (string) - Text
+-term-with-variable = { $term-message }
+message-without-comment = This string has a { $term-message }
diff --git a/tools/lint/test/files/fluent-lint/excluded.ftl b/tools/lint/test/files/fluent-lint/excluded.ftl
new file mode 100644
index 0000000000..79fe509ad6
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/excluded.ftl
@@ -0,0 +1,6 @@
+# This file is used to test excluding paths from tests.
+Blah-blah = Uppercase letters in identifiers are not permitted.
+blah-blah = This is a legal identifier.
+blah_blah = Underscores in identifiers are not permitted.
+
+bad-apostrophe-1 = The bee's knees
diff --git a/tools/lint/test/files/fluent-lint/test-brands.ftl b/tools/lint/test/files/fluent-lint/test-brands.ftl
new file mode 100644
index 0000000000..1aa6e9d0e8
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/test-brands.ftl
@@ -0,0 +1,5 @@
+# These are brands used in the fluent-lint test
+
+-brand-first = Firefox
+-brand-second = Thunderbird
+-brand-third = Mozilla
diff --git a/tools/lint/test/files/fluent-lint/tools/lint/fluent-lint/exclusions.yml b/tools/lint/test/files/fluent-lint/tools/lint/fluent-lint/exclusions.yml
new file mode 100644
index 0000000000..1aecf8cedd
--- /dev/null
+++ b/tools/lint/test/files/fluent-lint/tools/lint/fluent-lint/exclusions.yml
@@ -0,0 +1,17 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+ID01:
+    messages:
+        - Invalid_Id
+    files:
+        - excluded.ftl
+ID02:
+    messages: []
+    files: []
+CO01:
+    messages:
+        - bad-firefox-excluded
+    files:
+        - brand-names-excluded.ftl
diff --git a/tools/lint/test/files/license/.eslintrc.js b/tools/lint/test/files/license/.eslintrc.js
new file mode 100644
index 0000000000..0449fdfa33
--- /dev/null
+++ b/tools/lint/test/files/license/.eslintrc.js
@@ -0,0 +1,5 @@
+
+// Dot file to verify that it works
+// without license
+
+"use strict";
diff --git a/tools/lint/test/files/license/bad.c b/tools/lint/test/files/license/bad.c
new file mode 100644
index 0000000000..76e8197013
--- /dev/null
+++ b/tools/lint/test/files/license/bad.c
@@ -0,0 +1 @@
+int main() { return 0; }
diff --git a/tools/lint/test/files/license/bad.js b/tools/lint/test/files/license/bad.js
new file mode 100644
index 0000000000..5de1a72f1f
--- /dev/null
+++ b/tools/lint/test/files/license/bad.js
@@ -0,0 +1,6 @@
+/*
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Pulic Unknown License as published by
+ * the Free Software Foundation, version 3.
+ *
+ */
diff --git a/tools/lint/test/files/license/good-other.h b/tools/lint/test/files/license/good-other.h
new file mode 100644
index 0000000000..fb915e9b26
--- /dev/null
+++ b/tools/lint/test/files/license/good-other.h
@@ -0,0 +1,9 @@
+/*
+Permission to use, copy, modify, distribute and sell this software
+and its documentation for any purpose is hereby granted without fee,
+provided that the above copyright notice appear in all copies and
+that both that copyright notice and this permission notice appear
+in supporting documentation.  Samphan Raruenrom makes no
+representations about the suitability of this software for any
+purpose.  It is provided "as is" without express or implied warranty.
+*/
diff --git a/tools/lint/test/files/license/good.c b/tools/lint/test/files/license/good.c
new file mode 100644
index 0000000000..d1a6827fb1
--- /dev/null
+++ b/tools/lint/test/files/license/good.c
@@ -0,0 +1,8 @@
+
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+int main() { return 0; }
diff --git a/tools/lint/test/files/license/good.js b/tools/lint/test/files/license/good.js
new file mode 100644
index 0000000000..d10ae3a8d5
--- /dev/null
+++ b/tools/lint/test/files/license/good.js
@@ -0,0 +1,7 @@
+#!/usr/bin/env node
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+# Nothing
+
diff --git a/tools/lint/test/files/lintpref/bad.js b/tools/lint/test/files/lintpref/bad.js
new file mode 100644
index 0000000000..ab55ba5dad
--- /dev/null
+++ b/tools/lint/test/files/lintpref/bad.js
@@ -0,0 +1,2 @@
+// Real test pref, matching value.
+pref("dom.webidl.test1", true);
diff --git a/tools/lint/test/files/lintpref/good.js b/tools/lint/test/files/lintpref/good.js
new file mode 100644
index 0000000000..0bf81c8f58
--- /dev/null
+++ b/tools/lint/test/files/lintpref/good.js
@@ -0,0 +1,6 @@
+// Fake prefs.
+pref("foo.bar", 1);
+pref("foo.baz", "1.234");
+
+// Real test pref, different value.
+pref("dom.webidl.test1", false);
diff --git a/tools/lint/test/files/rst/.dotfile.rst b/tools/lint/test/files/rst/.dotfile.rst
new file mode 100644
index 0000000000..be24e1d161
--- /dev/null
+++ b/tools/lint/test/files/rst/.dotfile.rst
@@ -0,0 +1,11 @@
+============
+Coding style
+==========
+
+foo bar 
+~~~~~
+
+
+This file has error but should not be there
+as we don't analyze dot files
+
diff --git a/tools/lint/test/files/rst/bad.rst b/tools/lint/test/files/rst/bad.rst
new file mode 100644
index 0000000000..c9b60f613e
--- /dev/null
+++ b/tools/lint/test/files/rst/bad.rst
@@ -0,0 +1,20 @@
+============
+Coding style
+============
+
+
+This document attempts to explain the basic styles and patterns used in
+the Mozilla codebase. New code should try to conform to these standards,
+so it is as easy to maintain as existing code. There are exceptions, but
+it's still important to know the rules!
+
+
+Whitespace
+~~~~~~~~
+
+Line length
+~~~~~~~~~~~
+
+Line length
+~~~~~~~~~~~
+
diff --git a/tools/lint/test/files/rst/bad2.rst b/tools/lint/test/files/rst/bad2.rst
new file mode 100644
index 0000000000..81c35dde06
--- /dev/null
+++ b/tools/lint/test/files/rst/bad2.rst
@@ -0,0 +1,4 @@
+====
+Test
+===
+
diff --git a/tools/lint/test/files/rst/bad3.rst b/tools/lint/test/files/rst/bad3.rst
new file mode 100644
index 0000000000..b7e66e5c92
--- /dev/null
+++ b/tools/lint/test/files/rst/bad3.rst
@@ -0,0 +1,6 @@
+
+.. _When_Should_I_Use_a_Hashtable.3F:
+
+When Should I Use a Hashtable?
+------------------------------
+
diff --git a/tools/lint/test/files/rst/good.rst b/tools/lint/test/files/rst/good.rst
new file mode 100644
index 0000000000..fd12da85d3
--- /dev/null
+++ b/tools/lint/test/files/rst/good.rst
@@ -0,0 +1,11 @@
+============
+Coding style
+============
+
+
+This document attempts to explain the basic styles and patterns used in
+the Mozilla codebase. New code should try to conform to these standards,
+so it is as easy to maintain as existing code. There are exceptions, but
+it's still important to know the rules!
+
+
diff --git a/tools/lint/test/files/ruff/bad.py b/tools/lint/test/files/ruff/bad.py
new file mode 100644
index 0000000000..0015d7e7f9
--- /dev/null
+++ b/tools/lint/test/files/ruff/bad.py
@@ -0,0 +1,4 @@
+import distutils
+
+if not "foo" in "foobar":
+    print("oh no!")
diff --git a/tools/lint/test/files/ruff/ruff.toml b/tools/lint/test/files/ruff/ruff.toml
new file mode 100644
index 0000000000..34f5ca74a4
--- /dev/null
+++ b/tools/lint/test/files/ruff/ruff.toml
@@ -0,0 +1 @@
+# Empty config to force ruff to ignore the global one.
diff --git a/tools/lint/test/files/rustfmt/subdir/bad.rs b/tools/lint/test/files/rustfmt/subdir/bad.rs
new file mode 100644
index 0000000000..fb1746fafd
--- /dev/null
+++ b/tools/lint/test/files/rustfmt/subdir/bad.rs
@@ -0,0 +1,16 @@
+fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+    // Clippy detects this as a swap and considers this as an error
+    let mut a =
+        1;
+    let mut b=1;
+
+    a =
+        b;
+    b = a;
+
+
+}
diff --git a/tools/lint/test/files/rustfmt/subdir/bad2.rs b/tools/lint/test/files/rustfmt/subdir/bad2.rs
new file mode 100644
index 0000000000..a4236a2de7
--- /dev/null
+++ b/tools/lint/test/files/rustfmt/subdir/bad2.rs
@@ -0,0 +1,17 @@
+fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+    let mut a;
+    let mut b=1;
+    let mut vec = Vec::new();
+    vec.push(1);
+    vec.push(2);
+
+
+    for x in 5..10 - 5 {
+        a = x;
+    }
+
+    }
diff --git a/tools/lint/test/files/rustfmt/subdir/good.rs b/tools/lint/test/files/rustfmt/subdir/good.rs
new file mode 100644
index 0000000000..9bcaee67b7
--- /dev/null
+++ b/tools/lint/test/files/rustfmt/subdir/good.rs
@@ -0,0 +1,6 @@
+fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+}
diff --git a/tools/lint/test/files/shellcheck/bad.sh b/tools/lint/test/files/shellcheck/bad.sh
new file mode 100644
index 0000000000..b2eb195558
--- /dev/null
+++ b/tools/lint/test/files/shellcheck/bad.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+hello="Hello world"
+echo $1
diff --git a/tools/lint/test/files/shellcheck/good.sh b/tools/lint/test/files/shellcheck/good.sh
new file mode 100644
index 0000000000..e61d501955
--- /dev/null
+++ b/tools/lint/test/files/shellcheck/good.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+echo "Hello world"
diff --git a/tools/lint/test/files/stylelint/nolint/foo.txt b/tools/lint/test/files/stylelint/nolint/foo.txt
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tools/lint/test/files/stylelint/subdir/bad.css b/tools/lint/test/files/stylelint/subdir/bad.css
new file mode 100644
index 0000000000..70004c1fb2
--- /dev/null
+++ b/tools/lint/test/files/stylelint/subdir/bad.css
@@ -0,0 +1,5 @@
+#foo {
+  /* Duplicate property: */
+  font-size: 12px;
+  font-size: 12px;
+}
diff --git a/tools/lint/test/files/test-manifest-alpha/mochitest-in-order.ini b/tools/lint/test/files/test-manifest-alpha/mochitest-in-order.ini
new file mode 100644
index 0000000000..9de566702a
--- /dev/null
+++ b/tools/lint/test/files/test-manifest-alpha/mochitest-in-order.ini
@@ -0,0 +1,29 @@
+[DEFAULT]
+support-files =
+  click-event-helper.js
+  head.js
+  test-button-overlay.html
+  ../../../../dom/media/test/gizmo.mp4
+  ../../../../dom/media/test/owl.mp3
+
+prefs =
+  media.videocontrols.picture-in-picture.display-text-tracks.enabled=false
+
+[browser_AAA_run_first_firstTimePiPToggleEvents.js]
+[browser_aaa_run_first_firstTimePiPToggleEvents.js]
+[browser_backgroundTab.js]
+[browser_cannotTriggerFromContent.js]
+[browser_closePipPause.js]
+skip-if = os == "linux" && bits == 64 && os_version == "18.04" # Bug 1569205
+[browser_closePip_pageNavigationChanges.js]
+[browser_closePlayer.js]
+[browser_closeTab.js]
+[browser_close_unpip_focus.js]
+[browser_contextMenu.js]
+[browser_cornerSnapping.js]
+run-if = os == "mac"
+[browser_dblclickFullscreen.js]
+[browser_flipIconWithRTL.js]
+skip-if =
+  os == "linux" && ccov # Bug 1678091
+  tsan # Bug 1678091
diff --git a/tools/lint/test/files/test-manifest-alpha/mochitest-mostly-in-order.ini b/tools/lint/test/files/test-manifest-alpha/mochitest-mostly-in-order.ini
new file mode 100644
index 0000000000..01f2551bd4
--- /dev/null
+++ b/tools/lint/test/files/test-manifest-alpha/mochitest-mostly-in-order.ini
@@ -0,0 +1,30 @@
+[DEFAULT]
+support-files =
+  click-event-helper.js
+  head.js
+  test-button-overlay.html
+  ../../../../dom/media/test/gizmo.mp4
+  ../../../../dom/media/test/owl.mp3
+
+prefs =
+  media.videocontrols.picture-in-picture.display-text-tracks.enabled=false
+
+[browser_AAA_run_first_firstTimePiPToggleEvents.js]
+[browser_aaa_run_first_firstTimePiPToggleEvents.js]
+[browser_backgroundTab.js]
+[browser_cannotTriggerFromContent.js]
+[browser_closePipPause.js]
+skip-if = os == "linux" && bits == 64 && os_version == "18.04" # Bug 1569205
+[browser_closePip_pageNavigationChanges.js]
+[browser_closePlayer.js]
+[browser_closeTab.js]
+[browser_close_unpip_focus.js]
+[browser_contextMenu.js]
+[browser_cornerSnapping.js]
+run-if = os == "mac"
+[browser_dblclickFullscreen.js]
+[browser_flipIconWithRTL.js]
+skip-if =
+  os == "linux" && ccov # Bug 1678091
+  tsan # Bug 1678091
+[browser_a_new_test.js]
diff --git a/tools/lint/test/files/test-manifest-alpha/mochitest-very-out-of-order.ini b/tools/lint/test/files/test-manifest-alpha/mochitest-very-out-of-order.ini
new file mode 100644
index 0000000000..45bfdd776b
--- /dev/null
+++ b/tools/lint/test/files/test-manifest-alpha/mochitest-very-out-of-order.ini
@@ -0,0 +1,29 @@
+[DEFAULT]
+support-files =
+  click-event-helper.js
+  head.js
+  test-button-overlay.html
+  ../../../../dom/media/test/gizmo.mp4
+  ../../../../dom/media/test/owl.mp3
+
+prefs =
+  media.videocontrols.picture-in-picture.display-text-tracks.enabled=false
+
+[browser_contextMenu.js]
+[browser_aaa_run_first_firstTimePiPToggleEvents.js]
+[browser_AAA_run_first_firstTimePiPToggleEvents.js]
+[browser_backgroundTab.js]
+[browser_cannotTriggerFromContent.js]
+[browser_close_unpip_focus.js]
+[browser_closePip_pageNavigationChanges.js]
+[browser_closePipPause.js]
+skip-if = os == "linux" && bits == 64 && os_version == "18.04" # Bug 1569205
+[browser_cornerSnapping.js]
+run-if = os == "mac"
+[browser_closePlayer.js]
+[browser_closeTab.js]
+[browser_dblclickFullscreen.js]
+[browser_flipIconWithRTL.js]
+skip-if =
+  os == "linux" && ccov # Bug 1678091
+  tsan # Bug 1678091
diff --git a/tools/lint/test/files/test-manifest-alpha/other-ini-very-out-of-order.ini b/tools/lint/test/files/test-manifest-alpha/other-ini-very-out-of-order.ini
new file mode 100644
index 0000000000..45bfdd776b
--- /dev/null
+++ b/tools/lint/test/files/test-manifest-alpha/other-ini-very-out-of-order.ini
@@ -0,0 +1,29 @@
+[DEFAULT]
+support-files =
+  click-event-helper.js
+  head.js
+  test-button-overlay.html
+  ../../../../dom/media/test/gizmo.mp4
+  ../../../../dom/media/test/owl.mp3
+
+prefs =
+  media.videocontrols.picture-in-picture.display-text-tracks.enabled=false
+
+[browser_contextMenu.js]
+[browser_aaa_run_first_firstTimePiPToggleEvents.js]
+[browser_AAA_run_first_firstTimePiPToggleEvents.js]
+[browser_backgroundTab.js]
+[browser_cannotTriggerFromContent.js]
+[browser_close_unpip_focus.js]
+[browser_closePip_pageNavigationChanges.js]
+[browser_closePipPause.js]
+skip-if = os == "linux" && bits == 64 && os_version == "18.04" # Bug 1569205
+[browser_cornerSnapping.js]
+run-if = os == "mac"
+[browser_closePlayer.js]
+[browser_closeTab.js]
+[browser_dblclickFullscreen.js]
+[browser_flipIconWithRTL.js]
+skip-if =
+  os == "linux" && ccov # Bug 1678091
+  tsan # Bug 1678091
diff --git a/tools/lint/test/files/trojan-source/README b/tools/lint/test/files/trojan-source/README
new file mode 100644
index 0000000000..343a9d0c3c
--- /dev/null
+++ b/tools/lint/test/files/trojan-source/README
@@ -0,0 +1,5 @@
+These examples are taken from trojan source:
+https://github.com/nickboucher/trojan-source
+
+The examples are published under the MIT license.
+
diff --git a/tools/lint/test/files/trojan-source/commenting-out.cpp b/tools/lint/test/files/trojan-source/commenting-out.cpp
new file mode 100644
index 0000000000..d67df70ce1
--- /dev/null
+++ b/tools/lint/test/files/trojan-source/commenting-out.cpp
@@ -0,0 +1,9 @@
+#include <iostream>
+
+int main() {
+    bool isAdmin = false;
+    /*‮ } ⁦if (isAdmin)⁩ ⁦ begin admins only */
+        std::cout << "You are an admin.\n";
+    /* end admins only ‮ { ⁦*/
+    return 0;
+}
\ No newline at end of file
diff --git a/tools/lint/test/files/trojan-source/early-return.py b/tools/lint/test/files/trojan-source/early-return.py
new file mode 100644
index 0000000000..2797d8ae9f
--- /dev/null
+++ b/tools/lint/test/files/trojan-source/early-return.py
@@ -0,0 +1,9 @@
+#!/usr/bin/env python3
+bank = { 'alice': 100 }
+
+def subtract_funds(account: str, amount: int):
+    ''' Subtract funds from bank account then ⁧''' ;return
+    bank[account] -= amount
+    return
+
+subtract_funds('alice', 50)
\ No newline at end of file
diff --git a/tools/lint/test/files/trojan-source/invisible-function.rs b/tools/lint/test/files/trojan-source/invisible-function.rs
new file mode 100644
index 0000000000..b32efb0372
--- /dev/null
+++ b/tools/lint/test/files/trojan-source/invisible-function.rs
@@ -0,0 +1,15 @@
+fn isAdmin() {
+    return false;
+}
+
+fn is​Admin() {
+    return true;
+}
+
+fn main() {
+    if is​Admin() {
+        printf("You are an admin\n");
+    } else {
+        printf("You are NOT an admin.\n");
+    }
+}
\ No newline at end of file
diff --git a/tools/lint/test/files/updatebot/.yamllint b/tools/lint/test/files/updatebot/.yamllint
new file mode 100644
index 0000000000..4f11bbd6c5
--- /dev/null
+++ b/tools/lint/test/files/updatebot/.yamllint
@@ -0,0 +1,6 @@
+# Any copyright is dedicated to the Public Domain.
+# http://creativecommons.org/publicdomain/zero/1.0/
+
+# Explicity default .yamllint to isolate tests from tree-wide yamlint config.
+---
+extends: default
diff --git a/tools/lint/test/files/updatebot/cargo-mismatch.yaml b/tools/lint/test/files/updatebot/cargo-mismatch.yaml
new file mode 100644
index 0000000000..ac18d2b87c
--- /dev/null
+++ b/tools/lint/test/files/updatebot/cargo-mismatch.yaml
@@ -0,0 +1,44 @@
+---
+# Version of this schema
+schema: 1
+
+bugzilla:
+  # Bugzilla product and component for this directory and subdirectories
+  product: Core
+  component: "Graphics: WebGPU"
+
+# Document the source of externally hosted code
+origin:
+
+  # Short name of the package/library
+  name: wgpu
+
+  description: A cross-platform pure-Rust graphics API
+
+  # Full URL for the package's homepage/etc
+  # Usually different from repository url
+  url: https://github.com/gfx-rs/wgpu
+
+  # Human-readable identifier for this version/release
+  # Generally "version NNN", "tag SSS", "bookmark SSS"
+  release: commit 32af4f56
+
+  # Revision to pull in
+  # Must be a long or short commit SHA (long preferred)
+  revision: idontmatchanything
+
+  license: ['MIT', 'Apache-2.0']
+
+updatebot:
+  maintainer-phab: jimb
+  maintainer-bz: jimb@mozilla.com
+  tasks:
+    - type: vendoring
+      enabled: true
+      frequency: 1 week
+
+vendoring:
+  url: https://github.com/gfx-rs/wgpu
+  source-hosting: github
+  vendor-directory: gfx/wgpu_bindings/
+  flavor: rust
diff --git a/tools/lint/test/files/updatebot/good1.yaml b/tools/lint/test/files/updatebot/good1.yaml
new file mode 100644
index 0000000000..f57d2c5b4c
--- /dev/null
+++ b/tools/lint/test/files/updatebot/good1.yaml
@@ -0,0 +1,44 @@
+---
+schema: 1
+
+bugzilla:
+  product: Core
+  component: Graphics
+
+origin:
+  name: angle
+
+  description: ANGLE - Almost Native Graphics Layer Engine
+
+  url: https://chromium.googlesource.com/angle/angle
+
+  # Note that while the vendoring information here, including revision,
+  # release, and upstream repo locations refer to the third party upstream,
+  # Angle is vendored from a mozilla git repository that pulls from
+  # upstream and mainntains local patches there.
+  release: commit 018f85dea11fd5e41725750c6958695a6b8e8409
+  revision: 018f85dea11fd5e41725750c6958695a6b8e8409
+
+  license: BSD-3-Clause
+
+updatebot:
+  maintainer-phab: jgilbert
+  maintainer-bz: jgilbert@mozilla.com
+  tasks:
+    - type: commit-alert
+      enabled: true
+      branch: chromium/4515
+      needinfo: ["jgilbert@mozilla.com"]
+
+vendoring:
+  url: https://chromium.googlesource.com/angle/angle
+  tracking: tag
+  source-hosting: angle
+  vendor-directory: gfx/angle/checkout
+  skip-vendoring-steps: ["fetch", "update-moz-build"]
+
+  update-actions:
+    - action: run-script
+      script: '{yaml_dir}/auto-update-angle.sh'
+      args: ['{revision}']
+      cwd: '{cwd}'
diff --git a/tools/lint/test/files/updatebot/good2.yaml b/tools/lint/test/files/updatebot/good2.yaml
new file mode 100644
index 0000000000..0161d28b11
--- /dev/null
+++ b/tools/lint/test/files/updatebot/good2.yaml
@@ -0,0 +1,74 @@
+---
+# Version of this schema
+schema: 1
+
+bugzilla:
+  # Bugzilla product and component for this directory and subdirectories
+  product: Core
+  component: "Audio/Video: Playback"
+
+# Document the source of externally hosted code
+origin:
+
+  # Short name of the package/library
+  name: dav1d
+
+  description: dav1d, a fast AV1 decoder
+
+  # Full URL for the package's homepage/etc
+  # Usually different from repository url
+  url: https://code.videolan.org/videolan/dav1d
+
+  # Human-readable identifier for this version/release
+  # Generally "version NNN", "tag SSS", "bookmark SSS"
+  release: ffb59680356fd210816cf9e46d9d023ade1f4d5a
+
+  # Revision to pull in
+  # Must be a long or short commit SHA (long preferred)
+  revision: ffb59680356fd210816cf9e46d9d023ade1f4d5a
+
+  # The package's license, where possible using the mnemonic from
+  # https://spdx.org/licenses/
+  # Multiple licenses can be specified (as a YAML list)
+  # A "LICENSE" file must exist containing the full license text
+  license: BSD-2-Clause
+
+  license-file: COPYING
+
+updatebot:
+  maintainer-phab: chunmin
+  maintainer-bz: cchang@mozilla.com
+  tasks:
+    - type: vendoring
+      enabled: true
+      frequency: release
+
+vendoring:
+  url: https://code.videolan.org/videolan/dav1d
+  source-hosting: gitlab
+  vendor-directory: third_party/dav1d
+
+  exclude:
+    - build/.gitattributes
+    - build/.gitignore
+    - doc
+    - examples
+    - package
+    - tools
+
+  generated:
+    - '{yaml_dir}/vcs_version.h'
+    - '{yaml_dir}/version.h'
+
+  update-actions:
+    - action: copy-file
+      from: include/vcs_version.h.in
+      to: '{yaml_dir}/vcs_version.h'
+    - action: replace-in-file
+      pattern: '@VCS_TAG@'
+      with: '{revision}'
+      file: '{yaml_dir}/vcs_version.h'
+    - action: run-script
+      script: '{yaml_dir}/update-version.sh'
+      cwd: '{vendor_dir}'
+      args: ['{yaml_dir}/version.h']
diff --git a/tools/lint/test/files/updatebot/no-revision.yaml b/tools/lint/test/files/updatebot/no-revision.yaml
new file mode 100644
index 0000000000..4d581508d8
--- /dev/null
+++ b/tools/lint/test/files/updatebot/no-revision.yaml
@@ -0,0 +1,43 @@
+---
+schema: 1
+
+bugzilla:
+  product: Core
+  component: Graphics
+
+origin:
+  name: angle
+
+  description: ANGLE - Almost Native Graphics Layer Engine
+
+  url: https://chromium.googlesource.com/angle/angle
+
+  # Note that while the vendoring information here, including revision,
+  # release, and upstream repo locations refer to the third party upstream,
+  # Angle is vendored from a mozilla git repository that pulls from
+  # upstream and mainntains local patches there.
+  release: commit 018f85dea11fd5e41725750c6958695a6b8e8409
+
+  license: BSD-3-Clause
+
+updatebot:
+  maintainer-phab: jgilbert
+  maintainer-bz: jgilbert@mozilla.com
+  tasks:
+    - type: commit-alert
+      enabled: true
+      branch: chromium/4515
+      needinfo: ["jgilbert@mozilla.com"]
+
+vendoring:
+  url: https://chromium.googlesource.com/angle/angle
+  tracking: tag
+  source-hosting: angle
+  vendor-directory: gfx/angle/checkout
+  skip-vendoring-steps: ["fetch", "update-moz-build"]
+
+  update-actions:
+    - action: run-script
+      script: '{yaml_dir}/auto-update-angle.sh'
+      args: ['{revision}']
+      cwd: '{cwd}'
diff --git a/tools/lint/test/files/yaml/.yamllint b/tools/lint/test/files/yaml/.yamllint
new file mode 100644
index 0000000000..4f11bbd6c5
--- /dev/null
+++ b/tools/lint/test/files/yaml/.yamllint
@@ -0,0 +1,6 @@
+# Any copyright is dedicated to the Public Domain.
+# http://creativecommons.org/publicdomain/zero/1.0/
+
+# Explicity default .yamllint to isolate tests from tree-wide yamlint config.
+---
+extends: default
diff --git a/tools/lint/test/files/yaml/bad.yml b/tools/lint/test/files/yaml/bad.yml
new file mode 100644
index 0000000000..195ac7b030
--- /dev/null
+++ b/tools/lint/test/files/yaml/bad.yml
@@ -0,0 +1,8 @@
+---
+yamllint:
+  description: YAML linteraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaax
+  include:
+        - .cron.yml
+        - browser/config/
+        - wrong
+  application:bar
diff --git a/tools/lint/test/files/yaml/good.yml b/tools/lint/test/files/yaml/good.yml
new file mode 100644
index 0000000000..b30941b797
--- /dev/null
+++ b/tools/lint/test/files/yaml/good.yml
@@ -0,0 +1,6 @@
+---
+yamllint:
+    description: YAML linter
+    include:
+        - .cron.yml
+        - browser/config/
diff --git a/tools/lint/test/python.ini b/tools/lint/test/python.ini
new file mode 100644
index 0000000000..acbd032423
--- /dev/null
+++ b/tools/lint/test/python.ini
@@ -0,0 +1,35 @@
+[DEFAULT]
+subsuite = mozlint
+
+[test_android_format.py]
+[test_black.py]
+requirements = tools/lint/python/black_requirements.txt
+[test_clang_format.py]
+[test_codespell.py]
+[test_eslint.py]
+skip-if = os == "win"  # busts the tree for subsequent tasks on the same worker (bug 1708591)
+# Setup conflicts with stylelint setup so this should run sequentially.
+sequential = true
+[test_file_license.py]
+[test_file_perm.py]
+skip-if = os == "win"
+[test_file_whitespace.py]
+[test_fluent_lint.py]
+[test_lintpref.py]
+[test_manifest_alpha.py]
+[test_perfdocs.py]
+[test_perfdocs_generation.py]
+[test_updatebot.py]
+[test_perfdocs_helpers.py]
+[test_rst.py]
+requirements = tools/lint/rst/requirements.txt
+[test_ruff.py]
+requirements = tools/lint/python/ruff_requirements.txt
+[test_rustfmt.py]
+[test_shellcheck.py]
+[test_stylelint.py]
+skip-if = os == "win"  # busts the tree for subsequent tasks on the same worker (bug 1708591)
+# Setup conflicts with eslint setup so this should run sequentially.
+sequential = true
+[test_trojan_source.py]
+[test_yaml.py]
diff --git a/tools/lint/test/test_android_format.py b/tools/lint/test/test_android_format.py
new file mode 100644
index 0000000000..70cd1ea02e
--- /dev/null
+++ b/tools/lint/test/test_android_format.py
@@ -0,0 +1,38 @@
+import mozunit
+from conftest import build
+
+LINTER = "android-format"
+
+
+def test_basic(global_lint, config):
+    substs = {
+        "GRADLE_ANDROID_FORMAT_LINT_CHECK_TASKS": [
+            "spotlessJavaCheck",
+            "spotlessKotlinCheck",
+        ],
+        "GRADLE_ANDROID_FORMAT_LINT_FIX_TASKS": [
+            "spotlessJavaApply",
+            "spotlessKotlinApply",
+        ],
+        "GRADLE_ANDROID_FORMAT_LINT_FOLDERS": ["tools/lint/test/files/android-format"],
+    }
+    results = global_lint(
+        config=config,
+        topobjdir=build.topobjdir,
+        root=build.topsrcdir,
+        substs=substs,
+        extra_args=["-PandroidFormatLintTest"],
+    )
+    print(results)
+
+    # When first task (spotlessJavaCheck) hits error, we won't check next Kotlin error.
+    # So results length will be 1.
+    assert len(results) == 1
+    assert results[0].level == "error"
+
+    # Since android-format is global lint, fix=True overrides repository files directly.
+    # No way to add this test.
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_black.py b/tools/lint/test/test_black.py
new file mode 100644
index 0000000000..9027670665
--- /dev/null
+++ b/tools/lint/test/test_black.py
@@ -0,0 +1,53 @@
+# -*- coding: utf-8 -*-
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import mozunit
+
+LINTER = "black"
+fixed = 0
+
+
+def test_lint_fix(lint, create_temp_file):
+
+    contents = """def is_unique(
+               s
+               ):
+    s = list(s
+                )
+    s.sort()
+
+
+    for i in range(len(s) - 1):
+        if s[i] == s[i + 1]:
+            return 0
+    else:
+        return 1
+
+
+if __name__ == "__main__":
+    print(
+          is_unique(input())
+         ) """
+
+    path = create_temp_file(contents, "bad.py")
+    lint([path], fix=True)
+    assert fixed == 1
+
+
+def test_lint_black(lint, paths):
+    results = lint(paths())
+    assert len(results) == 2
+
+    assert results[0].level == "error"
+    assert results[0].relpath == "bad.py"
+
+    assert "EOF" in results[1].message
+    assert results[1].level == "error"
+    assert results[1].relpath == "invalid.py"
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_clang_format.py b/tools/lint/test/test_clang_format.py
new file mode 100644
index 0000000000..809280601d
--- /dev/null
+++ b/tools/lint/test/test_clang_format.py
@@ -0,0 +1,139 @@
+import mozunit
+from conftest import build
+
+LINTER = "clang-format"
+fixed = 0
+
+
+def test_good(lint, config, paths):
+    results = lint(paths("good/"), root=build.topsrcdir, use_filters=False)
+    print(results)
+    assert len(results) == 0
+
+    results = lint(paths("good/"), root=build.topsrcdir, use_filters=False, fix=True)
+    assert fixed == len(results)
+
+
+def test_basic(lint, config, paths):
+    results = lint(paths("bad/bad.cpp"), root=build.topsrcdir, use_filters=False)
+    print(results)
+    assert len(results) == 1
+
+    assert "Reformat C/C++" in results[0].message
+    assert results[0].level == "warning"
+    assert results[0].lineno == 1
+    assert results[0].column == 0
+    assert "bad.cpp" in results[0].path
+    assert (
+        results[0].diff
+        == """\
+-int  main ( ) { 
+-
+-return 0;   
+-
+-
+-}
++int main() { return 0; }
+"""  # noqa
+    )
+
+
+def test_dir(lint, config, paths):
+    results = lint(paths("bad/"), root=build.topsrcdir, use_filters=False)
+    print(results)
+    assert len(results) == 5
+
+    assert "Reformat C/C++" in results[0].message
+    assert results[0].level == "warning"
+    assert results[0].lineno == 1
+    assert results[0].column == 0
+    assert "bad.cpp" in results[0].path
+    assert (
+        results[0].diff
+        == """\
+-int  main ( ) { 
+-
+-return 0;   
+-
+-
+-}
++int main() { return 0; }
+"""  # noqa
+    )
+
+    assert "Reformat C/C++" in results[1].message
+    assert results[1].level == "warning"
+    assert results[1].lineno == 1
+    assert results[1].column == 0
+    assert "bad2.c" in results[1].path
+    assert (
+        results[1].diff
+        == """\
+-#include "bad2.h"
+-
+-
+-int bad2() {
++#include "bad2.h"
++
++int bad2() {
+"""
+    )
+
+    assert "Reformat C/C++" in results[2].message
+    assert results[2].level == "warning"
+    assert results[2].lineno == 5
+    assert results[2].column == 0
+    assert "bad2.c" in results[2].path
+    assert (
+        results[2].diff
+        == """\
+-  int a =2;
++  int a = 2;
+"""
+    )
+
+    assert "Reformat C/C++" in results[3].message
+    assert results[3].level == "warning"
+    assert results[3].lineno == 6
+    assert results[3].column == 0
+    assert "bad2.c" in results[3].path
+    assert (
+        results[3].diff
+        == """\
+-  return a;
+-
+-}
++  return a;
++}
+"""
+    )
+
+    assert "Reformat C/C++" in results[4].message
+    assert results[4].level == "warning"
+    assert results[4].lineno == 1
+    assert results[4].column == 0
+    assert "bad2.h" in results[4].path
+    assert (
+        results[4].diff
+        == """\
+-int bad2(void );
++int bad2(void);
+"""
+    )
+
+
+def test_fixed(lint, create_temp_file):
+
+    contents = """int  main ( ) { \n
+return 0; \n
+
+}"""
+
+    path = create_temp_file(contents, "ignore.cpp")
+    lint([path], use_filters=False, fix=True)
+
+    assert fixed == 1
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_codespell.py b/tools/lint/test/test_codespell.py
new file mode 100644
index 0000000000..8baae66b41
--- /dev/null
+++ b/tools/lint/test/test_codespell.py
@@ -0,0 +1,37 @@
+import mozunit
+
+LINTER = "codespell"
+fixed = 0
+
+
+def test_lint_codespell_fix(lint, create_temp_file):
+    contents = """This is a file with some typos and informations.
+But also testing false positive like optin (because this isn't always option)
+or stuff related to our coding style like:
+aparent (aParent).
+but detects mistakes like mozila
+""".lstrip()
+
+    path = create_temp_file(contents, "ignore.rst")
+    lint([path], fix=True)
+
+    assert fixed == 2
+
+
+def test_lint_codespell(lint, paths):
+    results = lint(paths())
+    assert len(results) == 2
+
+    assert results[0].message == "informations ==> information"
+    assert results[0].level == "error"
+    assert results[0].lineno == 1
+    assert results[0].relpath == "ignore.rst"
+
+    assert results[1].message == "mozila ==> mozilla"
+    assert results[1].level == "error"
+    assert results[1].lineno == 5
+    assert results[1].relpath == "ignore.rst"
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_eslint.py b/tools/lint/test/test_eslint.py
new file mode 100644
index 0000000000..b4fda2fb35
--- /dev/null
+++ b/tools/lint/test/test_eslint.py
@@ -0,0 +1,99 @@
+import mozunit
+import pytest
+from conftest import build
+
+LINTER = "eslint"
+fixed = 0
+
+
+@pytest.fixture
+def eslint(lint):
+    def inner(*args, **kwargs):
+        # --no-ignore is for ESLint to avoid the .eslintignore file.
+        # --ignore-path is because Prettier doesn't have the --no-ignore option
+        # and therefore needs to be given an empty file for the tests to work.
+        kwargs["extra_args"] = [
+            "--no-ignore",
+            "--ignore-path=tools/lint/test/files/eslint/testprettierignore",
+        ]
+        return lint(*args, **kwargs)
+
+    return inner
+
+
+def test_lint_with_global_exclude(lint, config, paths):
+    config["exclude"] = ["subdir", "import"]
+    # This uses lint directly as we need to not ignore the excludes.
+    results = lint(paths(), config=config, root=build.topsrcdir)
+    assert len(results) == 0
+
+
+def test_no_files_to_lint(eslint, config, paths):
+    # A directory with no files to lint.
+    results = eslint(paths("nolint"), root=build.topsrcdir)
+    assert results == []
+
+    # Errors still show up even when a directory with no files is passed in.
+    results = eslint(paths("nolint", "subdir/bad.js"), root=build.topsrcdir)
+    assert len(results) == 1
+
+
+def test_bad_import(eslint, config, paths):
+    results = eslint(paths("import"), config=config, root=build.topsrcdir)
+    assert results == 1
+
+
+def test_eslint_rule(eslint, config, create_temp_file):
+    contents = """var re = /foo   bar/;
+var re = new RegExp("foo   bar");
+"""
+    path = create_temp_file(contents, "bad.js")
+    results = eslint(
+        [path], config=config, root=build.topsrcdir, rules=["no-regex-spaces: error"]
+    )
+
+    assert len(results) == 2
+
+
+def test_eslint_fix(eslint, config, create_temp_file):
+    contents = """/*eslint no-regex-spaces: "error"*/
+
+var re = /foo   bar/;
+var re = new RegExp("foo   bar");
+
+var re = /foo   bar/;
+var re = new RegExp("foo   bar");
+
+var re = /foo   bar/;
+var re = new RegExp("foo   bar");
+"""
+    path = create_temp_file(contents, "bad.js")
+    eslint([path], config=config, root=build.topsrcdir, fix=True)
+
+    # ESLint returns counts of files fixed, not errors fixed.
+    assert fixed == 1
+
+
+def test_prettier_rule(eslint, config, create_temp_file):
+    contents = """var re = /foobar/;
+    var re = "foo";
+"""
+    path = create_temp_file(contents, "bad.js")
+    results = eslint([path], config=config, root=build.topsrcdir)
+
+    assert len(results) == 1
+
+
+def test_prettier_fix(eslint, config, create_temp_file):
+    contents = """var re = /foobar/;
+    var re = "foo";
+"""
+    path = create_temp_file(contents, "bad.js")
+    eslint([path], config=config, root=build.topsrcdir, fix=True)
+
+    # Prettier returns counts of files fixed, not errors fixed.
+    assert fixed == 1
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_file_license.py b/tools/lint/test/test_file_license.py
new file mode 100644
index 0000000000..b00b023bae
--- /dev/null
+++ b/tools/lint/test/test_file_license.py
@@ -0,0 +1,23 @@
+import mozunit
+
+LINTER = "license"
+
+
+def test_lint_license(lint, paths):
+    results = lint(paths())
+    print(results)
+    assert len(results) == 3
+
+    assert ".eslintrc.js" in results[0].relpath
+
+    assert "No matching license strings" in results[1].message
+    assert results[1].level == "error"
+    assert "bad.c" in results[1].relpath
+
+    assert "No matching license strings" in results[2].message
+    assert results[2].level == "error"
+    assert "bad.js" in results[2].relpath
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_file_perm.py b/tools/lint/test/test_file_perm.py
new file mode 100644
index 0000000000..08d6a20eef
--- /dev/null
+++ b/tools/lint/test/test_file_perm.py
@@ -0,0 +1,35 @@
+import mozunit
+import pytest
+
+LINTER = "file-perm"
+
+
+@pytest.mark.lint_config(name="file-perm")
+def test_lint_file_perm(lint, paths):
+    results = lint(paths("no-shebang"), collapse_results=True)
+
+    assert results.keys() == {
+        "no-shebang/bad.c",
+        "no-shebang/bad-shebang.c",
+        "no-shebang/bad.png",
+    }
+
+    for path, issues in results.items():
+        for issue in issues:
+            assert "permissions on a source" in issue.message
+            assert issue.level == "error"
+
+
+@pytest.mark.lint_config(name="maybe-shebang-file-perm")
+def test_lint_shebang_file_perm(config, lint, paths):
+    results = lint(paths("maybe-shebang"))
+
+    assert len(results) == 1
+
+    assert "permissions on a source" in results[0].message
+    assert results[0].level == "error"
+    assert results[0].relpath == "maybe-shebang/bad.js"
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_file_whitespace.py b/tools/lint/test/test_file_whitespace.py
new file mode 100644
index 0000000000..51b6fc4795
--- /dev/null
+++ b/tools/lint/test/test_file_whitespace.py
@@ -0,0 +1,51 @@
+import mozunit
+
+LINTER = "file-whitespace"
+fixed = 0
+
+
+def test_lint_file_whitespace(lint, paths):
+    results = lint(paths())
+    print(results)
+    assert len(results) == 5
+
+    assert "File does not end with newline character" in results[1].message
+    assert results[1].level == "error"
+    assert "bad-newline.c" in results[1].relpath
+
+    assert "Empty Lines at end of file" in results[0].message
+    assert results[0].level == "error"
+    assert "bad-newline.c" in results[0].relpath
+
+    assert "Windows line return" in results[2].message
+    assert results[2].level == "error"
+    assert "bad-windows.c" in results[2].relpath
+
+    assert "Trailing whitespace" in results[3].message
+    assert results[3].level == "error"
+    assert "bad.c" in results[3].relpath
+    assert results[3].lineno == 1
+
+    assert "Trailing whitespace" in results[4].message
+    assert results[4].level == "error"
+    assert "bad.c" in results[4].relpath
+    assert results[4].lineno == 2
+
+
+def test_lint_file_whitespace_fix(lint, paths, create_temp_file):
+
+    contents = """int main() {  \n
+    return 0;  \n
+}
+
+
+"""
+
+    path = create_temp_file(contents, "bad.cpp")
+    lint([path], fix=True)
+    # Gives a different answer on Windows. Probably because of Windows CR
+    assert fixed == 3 or fixed == 2
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_fluent_lint.py b/tools/lint/test/test_fluent_lint.py
new file mode 100644
index 0000000000..d7867a8269
--- /dev/null
+++ b/tools/lint/test/test_fluent_lint.py
@@ -0,0 +1,156 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import mozunit
+
+LINTER = "fluent-lint"
+
+
+def test_lint_exclusions(lint, paths):
+    results = lint(paths("excluded.ftl"))
+    assert len(results) == 1
+    assert results[0].rule == "TE01"
+    assert results[0].lineno == 6
+    assert results[0].column == 20
+
+
+def test_lint_single_file(lint, paths):
+    results = lint(paths("bad.ftl"))
+    assert len(results) == 13
+    assert results[0].rule == "ID01"
+    assert results[0].lineno == 1
+    assert results[0].column == 1
+    assert results[1].rule == "ID01"
+    assert results[1].lineno == 3
+    assert results[1].column == 1
+    assert results[2].rule == "TE01"
+    assert results[2].lineno == 5
+    assert results[2].column == 20
+    assert results[3].rule == "TE01"
+    assert results[3].lineno == 6
+    assert results[3].column == 24
+    assert results[4].rule == "TE02"
+    assert results[4].lineno == 7
+    assert results[4].column == 20
+    assert results[5].rule == "TE03"
+    assert results[5].lineno == 8
+    assert results[5].column == 20
+    assert results[6].rule == "TE04"
+    assert results[6].lineno == 11
+    assert results[6].column == 20
+    assert results[7].rule == "TE05"
+    assert results[7].lineno == 13
+    assert results[7].column == 16
+    assert results[8].rule == "TE03"
+    assert results[8].lineno == 17
+    assert results[8].column == 20
+    assert results[9].rule == "TE03"
+    assert results[9].lineno == 25
+    assert results[9].column == 18
+    assert results[10].rule == "ID02"
+    assert results[10].lineno == 32
+    assert results[10].column == 1
+    assert results[11].rule == "VC01"
+    assert "$tabCount" in results[11].message
+    assert results[12].rule == "VC01"
+    assert "$url" in results[12].message
+
+
+def test_comment_group(lint, paths):
+    results = lint(paths("comment-group1.ftl"))
+    assert len(results) == 6
+    assert results[0].rule == "GC03"
+    assert results[0].lineno == 12
+    assert results[0].column == 1
+    assert results[1].rule == "GC02"
+    assert results[1].lineno == 16
+    assert results[1].column == 1
+    assert results[2].rule == "GC04"
+    assert results[2].lineno == 21
+    assert results[2].column == 1
+    assert results[3].rule == "GC03"
+    assert results[3].lineno == 26
+    assert results[3].column == 1
+    assert results[4].rule == "GC02"
+    assert results[4].lineno == 30
+    assert results[4].column == 1
+    assert results[5].rule == "GC01"
+    assert results[5].lineno == 35
+    assert results[5].column == 1
+
+    results = lint(paths("comment-group2.ftl"))
+    assert (len(results)) == 0
+
+
+def test_comment_resource(lint, paths):
+    results = lint(paths("comment-resource1.ftl"))
+    assert len(results) == 1
+    assert results[0].rule == "RC01"
+    assert results[0].lineno == 9
+    assert results[0].column == 1
+
+    results = lint(paths("comment-resource2.ftl"))
+    assert len(results) == 1
+    assert results[0].rule == "RC03"
+    assert results[0].lineno == 4
+    assert results[0].column == 1
+
+    results = lint(paths("comment-resource3.ftl"))
+    assert len(results) == 1
+    assert results[0].rule == "RC02"
+    assert results[0].lineno == 5
+    assert results[0].column == 1
+
+    results = lint(paths("comment-resource4.ftl"))
+    assert len(results) == 1
+    assert results[0].rule == "RC03"
+    assert results[0].lineno == 6
+    assert results[0].column == 1
+
+    results = lint(paths("comment-resource5.ftl"))
+    assert len(results) == 1
+    assert results[0].rule == "RC02"
+    assert results[0].lineno == 5
+    assert results[0].column == 1
+
+    results = lint(paths("comment-resource6.ftl"))
+    assert len(results) == 0
+
+
+def test_brand_names(lint, paths):
+    results = lint(paths("brand-names.ftl"), {"brand-files": ["test-brands.ftl"]})
+    assert len(results) == 11
+    assert results[0].rule == "CO01"
+    assert results[0].lineno == 1
+    assert results[0].column == 16
+    assert "Firefox" in results[0].message
+    assert "Mozilla" not in results[0].message
+    assert "Thunderbird" not in results[0].message
+    assert results[1].rule == "CO01"
+    assert results[1].lineno == 4
+    assert results[1].column == 16
+
+    results = lint(paths("brand-names-excluded.ftl"))
+    assert len(results) == 0
+
+
+def test_comment_variables(lint, paths):
+    results = lint(paths("comment-variables1.ftl"))
+    assert len(results) == 4
+    assert results[0].rule == "VC01"
+    assert "$var" in results[0].message
+    assert results[1].rule == "VC01"
+    assert "$select1" in results[1].message
+    assert results[2].rule == "VC01"
+    assert "$select2" in results[2].message
+    assert results[3].rule == "VC01"
+    assert "$attr" in results[3].message
+
+    results = lint(paths("comment-variables2.ftl"))
+    assert len(results) == 1
+    assert results[0].rule == "VC01"
+    assert "$term-message" in results[0].message
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_lintpref.py b/tools/lint/test/test_lintpref.py
new file mode 100644
index 0000000000..3e75b1675e
--- /dev/null
+++ b/tools/lint/test/test_lintpref.py
@@ -0,0 +1,16 @@
+import mozunit
+
+LINTER = "lintpref"
+
+
+def test_lintpref(lint, paths):
+    results = lint(paths())
+    assert len(results) == 1
+    assert results[0].level == "error"
+    assert 'pref("dom.webidl.test1", true);' in results[0].message
+    assert "bad.js" in results[0].relpath
+    assert results[0].lineno == 2
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_manifest_alpha.py b/tools/lint/test/test_manifest_alpha.py
new file mode 100644
index 0000000000..2e8e1a6c77
--- /dev/null
+++ b/tools/lint/test/test_manifest_alpha.py
@@ -0,0 +1,33 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import mozunit
+
+LINTER = "test-manifest-alpha"
+
+
+def test_very_out_of_order(lint, paths):
+    results = lint(paths("mochitest-very-out-of-order.ini"))
+    assert len(results) == 1
+    assert results[0].diff
+
+
+def test_in_order(lint, paths):
+    results = lint(paths("mochitest-in-order.ini"))
+    assert len(results) == 0
+
+
+def test_mostly_in_order(lint, paths):
+    results = lint(paths("mochitest-mostly-in-order.ini"))
+    assert len(results) == 1
+    assert results[0].diff
+
+
+def test_other_ini_very_out_of_order(lint, paths):
+    """Test that an .ini file outside of the allowlist is ignored."""
+    results = lint(paths("other-ini-very-out-of-order.ini"))
+    assert len(results) == 0
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_perfdocs.py b/tools/lint/test/test_perfdocs.py
new file mode 100644
index 0000000000..3e52e86271
--- /dev/null
+++ b/tools/lint/test/test_perfdocs.py
@@ -0,0 +1,858 @@
+import contextlib
+import os
+import pathlib
+import shutil
+import tempfile
+from unittest import mock
+
+import mozunit
+import pytest
+
+LINTER = "perfdocs"
+
+
+class PerfDocsLoggerMock:
+    LOGGER = None
+    PATHS = []
+    FAILED = True
+
+
+"""
+This is a sample mozperftest test that we use for testing
+the verification process.
+"""
+SAMPLE_TEST = """
+"use strict";
+
+async function setUp(context) {
+  context.log.info("setUp example!");
+}
+
+async function test(context, commands) {
+  context.log.info("Test with setUp/tearDown example!");
+  await commands.measure.start("https://www.sitespeed.io/");
+  await commands.measure.start("https://www.mozilla.org/en-US/");
+}
+
+async function tearDown(context) {
+  context.log.info("tearDown example!");
+}
+
+module.noexport = {};
+
+module.exports = {
+  setUp,
+  tearDown,
+  test,
+  owner: "Performance Testing Team",
+  name: "Example",
+  description: "The description of the example test.",
+  longDescription: `
+  This is a longer description of the test perhaps including information
+  about how it should be run locally or links to relevant information.
+  `
+};
+"""
+
+
+SAMPLE_CONFIG = """
+name: mozperftest
+manifest: None
+static-only: False
+suites:
+    suite:
+        description: "Performance tests from the 'suite' folder."
+        tests:
+            Example: ""
+"""
+
+
+DYNAMIC_SAMPLE_CONFIG = """
+name: {}
+manifest: None
+static-only: False
+suites:
+    suite:
+        description: "Performance tests from the 'suite' folder."
+        tests:
+            Example: "Performance test Example from suite."
+    another_suite:
+        description: "Performance tests from the 'another_suite' folder."
+        tests:
+            Example: "Performance test Example from another_suite."
+"""
+
+
+SAMPLE_METRICS_CONFIG = """
+name: raptor
+manifest: "None"{}
+static-only: False
+suites:
+    suite:
+        description: "Performance tests from the 'suite' folder."{}
+        tests:
+            Example: "Performance test Example from another_suite."
+    another_suite:
+        description: "Performance tests from the 'another_suite' folder."
+        tests:
+            Example: "Performance test Example from another_suite."
+"""
+
+
+SAMPLE_INI = """
+[Example]
+test_url = Example_url
+alert_on = fcp
+"""
+
+SAMPLE_METRICS_INI = """
+[Example]
+test_url = Example_url
+alert_on = fcp,SpeedIndex
+"""
+
+
+@contextlib.contextmanager
+def temp_file(name="temp", tempdir=None, content=None):
+    if tempdir is None:
+        tempdir = tempfile.mkdtemp()
+    path = pathlib.Path(tempdir, name)
+    if content is not None:
+        with path.open("w", newline="\n") as f:
+            f.write(content)
+    try:
+        yield path
+    finally:
+        try:
+            shutil.rmtree(str(tempdir))
+        except FileNotFoundError:
+            pass
+
+
+@contextlib.contextmanager
+def temp_dir():
+    tempdir = pathlib.Path(tempfile.mkdtemp())
+    try:
+        yield tempdir
+    finally:
+        try:
+            shutil.rmtree(str(tempdir))
+        except FileNotFoundError:
+            pass
+
+
+def setup_sample_logger(logger, structured_logger, top_dir):
+    from perfdocs.logger import PerfDocLogger
+
+    PerfDocLogger.LOGGER = structured_logger
+    PerfDocLogger.PATHS = ["perfdocs"]
+    PerfDocLogger.TOP_DIR = top_dir
+
+    import perfdocs.gatherer as gt
+    import perfdocs.generator as gn
+    import perfdocs.verifier as vf
+
+    gt.logger = logger
+    vf.logger = logger
+    gn.logger = logger
+
+
+@mock.patch("taskgraph.util.taskcluster.get_artifact")
+@mock.patch("tryselect.tasks.generate_tasks")
+@mock.patch("perfdocs.generator.Generator")
+@mock.patch("perfdocs.verifier.Verifier")
+@mock.patch("perfdocs.logger.PerfDocLogger", new=PerfDocsLoggerMock)
+def test_perfdocs_start_and_fail(
+    verifier,
+    generator,
+    get_artifact_mock,
+    gen_tasks_mock,
+    structured_logger,
+    config,
+    paths,
+):
+    from perfdocs.perfdocs import run_perfdocs
+
+    with temp_file("bad", content="foo") as temp:
+        run_perfdocs(
+            config, logger=structured_logger, paths=[str(temp)], generate=False
+        )
+        assert PerfDocsLoggerMock.LOGGER == structured_logger
+        assert PerfDocsLoggerMock.PATHS == [temp]
+        assert PerfDocsLoggerMock.FAILED
+
+    assert verifier.call_count == 1
+    assert mock.call().validate_tree() in verifier.mock_calls
+    assert generator.call_count == 0
+
+
+@mock.patch("taskgraph.util.taskcluster.get_artifact")
+@mock.patch("tryselect.tasks.generate_tasks")
+@mock.patch("perfdocs.generator.Generator")
+@mock.patch("perfdocs.verifier.Verifier")
+@mock.patch("perfdocs.logger.PerfDocLogger", new=PerfDocsLoggerMock)
+def test_perfdocs_start_and_pass(verifier, generator, structured_logger, config, paths):
+    from perfdocs.perfdocs import run_perfdocs
+
+    PerfDocsLoggerMock.FAILED = False
+    with temp_file("bad", content="foo") as temp:
+        run_perfdocs(
+            config, logger=structured_logger, paths=[str(temp)], generate=False
+        )
+        assert PerfDocsLoggerMock.LOGGER == structured_logger
+        assert PerfDocsLoggerMock.PATHS == [temp]
+        assert not PerfDocsLoggerMock.FAILED
+
+    assert verifier.call_count == 1
+    assert mock.call().validate_tree() in verifier.mock_calls
+    assert generator.call_count == 1
+    assert mock.call().generate_perfdocs() in generator.mock_calls
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger", new=PerfDocsLoggerMock)
+def test_perfdocs_bad_paths(structured_logger, config, paths):
+    from perfdocs.perfdocs import run_perfdocs
+
+    with pytest.raises(Exception):
+        run_perfdocs(config, logger=structured_logger, paths=["bad"], generate=False)
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_gatherer_fetch_perfdocs_tree(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.gatherer import Gatherer
+
+    gatherer = Gatherer(top_dir)
+    assert not gatherer._perfdocs_tree
+
+    gatherer.fetch_perfdocs_tree()
+
+    expected = "Found 1 perfdocs directories"
+    args, _ = logger.log.call_args
+
+    assert expected in args[0]
+    assert logger.log.call_count == 1
+    assert gatherer._perfdocs_tree
+
+    expected = ["path", "yml", "rst", "static"]
+    for i, key in enumerate(gatherer._perfdocs_tree[0].keys()):
+        assert key == expected[i]
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_gatherer_get_test_list(logger, structured_logger, perfdocs_sample):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.gatherer import Gatherer
+
+    gatherer = Gatherer(top_dir)
+    gatherer.fetch_perfdocs_tree()
+    framework = gatherer.get_test_list(gatherer._perfdocs_tree[0])
+
+    expected = ["name", "test_list", "yml_content", "yml_path"]
+    for i, key in enumerate(sorted(framework.keys())):
+        assert key == expected[i]
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verification(logger, structured_logger, perfdocs_sample):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    verifier.validate_tree()
+
+    # Make sure that we had no warnings
+    assert logger.warning.call_count == 0
+    assert logger.log.call_count == 1
+    assert len(logger.mock_calls) == 1
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_validate_yaml_pass(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    yaml_path = perfdocs_sample["config"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    valid = Verifier(top_dir).validate_yaml(pathlib.Path(yaml_path))
+
+    assert valid
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_invalid_yaml(logger, structured_logger, perfdocs_sample):
+    top_dir = perfdocs_sample["top_dir"]
+    yaml_path = perfdocs_sample["config"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier("top_dir")
+    with open(yaml_path, "r", newline="\n") as f:
+        lines = f.readlines()
+        print(lines)
+    with open(yaml_path, "w", newline="\n") as f:
+        f.write("\n".join(lines[2:]))
+    valid = verifier.validate_yaml(yaml_path)
+
+    expected = ("YAML ValidationError: 'name' is a required property\n", yaml_path)
+    args, _ = logger.warning.call_args
+
+    assert logger.warning.call_count == 1
+    assert expected[0] in args[0]
+    assert not valid
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_validate_rst_pass(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    rst_path = perfdocs_sample["index"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    valid = Verifier(top_dir).validate_rst_content(pathlib.Path(rst_path))
+
+    assert valid
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_invalid_rst(logger, structured_logger, perfdocs_sample):
+    top_dir = perfdocs_sample["top_dir"]
+    rst_path = perfdocs_sample["index"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    # Replace the target string to invalid Keyword for test
+    with open(rst_path, "r") as file:
+        filedata = file.read()
+
+    filedata = filedata.replace("documentation", "Invalid Keyword")
+
+    with open(rst_path, "w", newline="\n") as file:
+        file.write(filedata)
+
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier("top_dir")
+    valid = verifier.validate_rst_content(rst_path)
+
+    expected = (
+        "Cannot find a '{documentation}' entry in the given index file",
+        rst_path,
+    )
+    args, _ = logger.warning.call_args
+
+    assert logger.warning.call_count == 1
+    assert args == expected
+    assert not valid
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_validate_descriptions_pass(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    verifier._check_framework_descriptions(verifier._gatherer.perfdocs_tree[0])
+
+    assert logger.warning.call_count == 0
+    assert logger.log.call_count == 1
+    assert len(logger.mock_calls) == 1
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_not_existing_suite_in_test_list(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    manifest_path = perfdocs_sample["manifest"]["path"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    os.remove(manifest_path)
+    verifier._check_framework_descriptions(verifier._gatherer.perfdocs_tree[0])
+
+    expected = (
+        "Could not find an existing suite for suite - bad suite name?",
+        perfdocs_sample["config"],
+    )
+    args, _ = logger.warning.call_args
+
+    assert logger.warning.call_count == 1
+    assert args == expected
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_not_existing_tests_in_suites(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    with open(perfdocs_sample["config"], "r") as file:
+        filedata = file.read()
+        filedata = filedata.replace("Example", "DifferentName")
+    with open(perfdocs_sample["config"], "w", newline="\n") as file:
+        file.write(filedata)
+
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    verifier._check_framework_descriptions(verifier._gatherer.perfdocs_tree[0])
+
+    expected = [
+        "Could not find an existing test for DifferentName - bad test name?",
+        "Could not find a test description for Example",
+    ]
+
+    assert logger.warning.call_count == 2
+    for i, call in enumerate(logger.warning.call_args_list):
+        args, _ = call
+        assert args[0] == expected[i]
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_missing_contents_in_suite(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    with open(perfdocs_sample["config"], "r") as file:
+        filedata = file.read()
+        filedata = filedata.replace("suite:", "InvalidSuite:")
+    with open(perfdocs_sample["config"], "w", newline="\n") as file:
+        file.write(filedata)
+
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    verifier._check_framework_descriptions(verifier._gatherer.perfdocs_tree[0])
+
+    expected = (
+        "Could not find an existing suite for InvalidSuite - bad suite name?",
+        "Missing suite description for suite",
+    )
+
+    assert logger.warning.call_count == 2
+    for i, call in enumerate(logger.warning.call_args_list):
+        args, _ = call
+        assert args[0] == expected[i]
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_invalid_dir(logger, structured_logger, perfdocs_sample):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier("invalid_path")
+    with pytest.raises(Exception) as exceinfo:
+        verifier.validate_tree()
+
+    assert str(exceinfo.value) == "No valid perfdocs directories found"
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_file_invalidation(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    with mock.patch("perfdocs.verifier.Verifier.validate_yaml", return_value=False):
+        verifier = Verifier(top_dir)
+        with pytest.raises(Exception):
+            verifier.validate_tree()
+
+    # Check if "File validation error" log is called
+    # and Called with a log inside perfdocs_tree().
+    assert logger.log.call_count == 2
+    assert len(logger.mock_calls) == 2
+
+
+@pytest.mark.parametrize(
+    "manifest, metric_definitions, expected",
+    [
+        [
+            SAMPLE_INI,
+            """
+metrics:
+    "FirstPaint":
+        aliases:
+            - fcp
+        description: "Example" """,
+            1,
+        ],
+        [
+            SAMPLE_METRICS_INI,
+            """
+metrics:
+    FirstPaint:
+        aliases:
+            - fcp
+        description: Example
+    SpeedIndex:
+        aliases:
+            - speedindex
+            - si
+        description: Example
+        """,
+            2,
+        ],
+    ],
+)
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_nonexistent_documented_metrics(
+    logger, structured_logger, perfdocs_sample, manifest, metric_definitions, expected
+):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    with open(perfdocs_sample["config"], "w", newline="\n") as f:
+        f.write(SAMPLE_METRICS_CONFIG.format(metric_definitions, ""))
+    with open(perfdocs_sample["manifest"]["path"], "w", newline="\n") as f:
+        f.write(manifest)
+
+    sample_gatherer_result = {
+        "suite": {"Example": {}},
+        "another_suite": {"Example": {}},
+    }
+
+    from perfdocs.verifier import Verifier
+
+    with mock.patch("perfdocs.framework_gatherers.RaptorGatherer.get_test_list") as m:
+        m.return_value = sample_gatherer_result
+        verifier = Verifier(top_dir)
+        verifier.validate_tree()
+
+    assert len(logger.warning.call_args_list) == expected
+    for (args, _) in logger.warning.call_args_list:
+        assert "Cannot find documented metric" in args[0]
+        assert "being used" in args[0]
+
+
+@pytest.mark.parametrize(
+    "manifest, metric_definitions",
+    [
+        [
+            SAMPLE_INI,
+            """
+metrics:
+    "FirstPaint":
+        aliases:
+            - fcp
+        description: "Example" """,
+        ],
+        [
+            SAMPLE_METRICS_INI,
+            """
+metrics:
+    SpeedIndex:
+        aliases:
+            - speedindex
+            - si
+        description: Example
+        """,
+        ],
+    ],
+)
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_undocumented_metrics(
+    logger, structured_logger, perfdocs_sample, manifest, metric_definitions
+):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    with open(perfdocs_sample["config"], "w", newline="\n") as f:
+        f.write(SAMPLE_METRICS_CONFIG.format(metric_definitions, ""))
+    with open(perfdocs_sample["manifest"]["path"], "w", newline="\n") as f:
+        f.write(manifest)
+
+    sample_gatherer_result = {
+        "suite": {"Example": {"metrics": ["fcp", "SpeedIndex"]}},
+        "another_suite": {"Example": {}},
+    }
+
+    from perfdocs.verifier import Verifier
+
+    with mock.patch("perfdocs.framework_gatherers.RaptorGatherer.get_test_list") as m:
+        m.return_value = sample_gatherer_result
+        verifier = Verifier(top_dir)
+        verifier.validate_tree()
+
+    assert len(logger.warning.call_args_list) == 1
+    for (args, _) in logger.warning.call_args_list:
+        assert "Missing description for the metric" in args[0]
+
+
+@pytest.mark.parametrize(
+    "manifest, metric_definitions, expected",
+    [
+        [
+            SAMPLE_INI,
+            """
+metrics:
+    "FirstPaint":
+        aliases:
+            - fcp
+            - SpeedIndex
+        description: "Example" """,
+            3,
+        ],
+        [
+            SAMPLE_METRICS_INI,
+            """
+metrics:
+    FirstPaint:
+        aliases:
+            - fcp
+        description: Example
+    SpeedIndex:
+        aliases:
+            - speedindex
+            - si
+        description: Example
+        """,
+            5,
+        ],
+    ],
+)
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_duplicate_metrics(
+    logger, structured_logger, perfdocs_sample, manifest, metric_definitions, expected
+):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    with open(perfdocs_sample["config"], "w", newline="\n") as f:
+        indented_defs = "\n".join(
+            [(" " * 8) + metric_line for metric_line in metric_definitions.split("\n")]
+        )
+        f.write(SAMPLE_METRICS_CONFIG.format(metric_definitions, indented_defs))
+    with open(perfdocs_sample["manifest"]["path"], "w", newline="\n") as f:
+        f.write(manifest)
+
+    sample_gatherer_result = {
+        "suite": {"Example": {"metrics": ["fcp", "SpeedIndex"]}},
+        "another_suite": {"Example": {}},
+    }
+
+    from perfdocs.verifier import Verifier
+
+    with mock.patch("perfdocs.framework_gatherers.RaptorGatherer.get_test_list") as m:
+        m.return_value = sample_gatherer_result
+        verifier = Verifier(top_dir)
+        verifier.validate_tree()
+
+    assert len(logger.warning.call_args_list) == expected
+    for (args, _) in logger.warning.call_args_list:
+        assert "Duplicate definitions found for " in args[0]
+
+
+@pytest.mark.parametrize(
+    "manifest, metric_definitions",
+    [
+        [
+            SAMPLE_INI,
+            """
+metrics:
+    "FirstPaint":
+        aliases:
+            - fcp
+            - SpeedIndex
+        description: "Example" """,
+        ],
+        [
+            SAMPLE_METRICS_INI,
+            """
+metrics:
+    FirstPaint:
+        aliases:
+            - fcp
+        description: Example
+    SpeedIndex:
+        aliases:
+            - speedindex
+            - si
+        description: Example
+        """,
+        ],
+    ],
+)
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_valid_metrics(
+    logger, structured_logger, perfdocs_sample, manifest, metric_definitions
+):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    with open(perfdocs_sample["config"], "w", newline="\n") as f:
+        f.write(SAMPLE_METRICS_CONFIG.format(metric_definitions, ""))
+    with open(perfdocs_sample["manifest"]["path"], "w", newline="\n") as f:
+        f.write(manifest)
+
+    sample_gatherer_result = {
+        "suite": {"Example": {"metrics": ["fcp", "SpeedIndex"]}},
+        "another_suite": {"Example": {}},
+    }
+
+    from perfdocs.verifier import Verifier
+
+    with mock.patch("perfdocs.framework_gatherers.RaptorGatherer.get_test_list") as m:
+        m.return_value = sample_gatherer_result
+        verifier = Verifier(top_dir)
+        verifier.validate_tree()
+
+    assert len(logger.warning.call_args_list) == 0
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_framework_gatherers(logger, structured_logger, perfdocs_sample):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    # Check to make sure that every single framework
+    # gatherer that has been implemented produces a test list
+    # in every suite that contains a test with an associated
+    # manifest.
+    from perfdocs.gatherer import frameworks
+
+    for framework, gatherer in frameworks.items():
+        with open(perfdocs_sample["config"], "w", newline="\n") as f:
+            f.write(DYNAMIC_SAMPLE_CONFIG.format(framework))
+
+        fg = gatherer(perfdocs_sample["config"], top_dir)
+        if getattr(fg, "get_test_list", None) is None:
+            # Skip framework gatherers that have not
+            # implemented a method to build a test list.
+            continue
+
+        # Setup some framework-specific things here if needed
+        if framework == "raptor":
+            fg._manifest_path = perfdocs_sample["manifest"]["path"]
+            fg._get_subtests_from_ini = mock.Mock()
+            fg._get_subtests_from_ini.return_value = {
+                "Example": perfdocs_sample["manifest"],
+            }
+
+        if framework == "talos":
+            fg._get_ci_tasks = mock.Mock()
+            for suite, suitetests in fg.get_test_list().items():
+                assert suite == "Talos Tests"
+                assert suitetests
+            continue
+
+        if framework == "awsy":
+            for suite, suitetests in fg.get_test_list().items():
+                assert suite == "Awsy tests"
+                assert suitetests
+            continue
+
+        for suite, suitetests in fg.get_test_list().items():
+            assert suite == "suite"
+            for test, manifest in suitetests.items():
+                assert test == "Example"
+                assert (
+                    pathlib.Path(manifest["path"])
+                    == perfdocs_sample["manifest"]["path"]
+                )
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_framework_gatherers_urls(logger, structured_logger, perfdocs_sample):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.gatherer import frameworks
+    from perfdocs.generator import Generator
+    from perfdocs.utils import read_yaml
+    from perfdocs.verifier import Verifier
+
+    # This test is only for raptor
+    gatherer = frameworks["raptor"]
+    with open(perfdocs_sample["config"], "w", newline="\n") as f:
+        f.write(DYNAMIC_SAMPLE_CONFIG.format("raptor"))
+
+    fg = gatherer(perfdocs_sample["config_2"], top_dir)
+    fg.get_suite_list = mock.Mock()
+    fg.get_suite_list.return_value = {
+        "suite": [perfdocs_sample["example1_manifest"]],
+        "another_suite": [perfdocs_sample["example2_manifest"]],
+    }
+
+    v = Verifier(top_dir)
+    gn = Generator(v, generate=True, workspace=top_dir)
+
+    # Check to make sure that if a test is present under multiple
+    # suties the urls are generated correctly for the test under
+    # every suite
+    for suite, suitetests in fg.get_test_list().items():
+        url = fg._descriptions.get(suite)
+        assert url is not None
+        assert url[0]["name"] == "Example"
+        assert url[0]["test_url"] == "Example_url"
+
+    perfdocs_tree = gn._perfdocs_tree[0]
+    yaml_content = read_yaml(
+        pathlib.Path(
+            os.path.join(os.path.join(perfdocs_tree["path"], perfdocs_tree["yml"]))
+        )
+    )
+    suites = yaml_content["suites"]
+
+    # Check that the sections for each suite are generated correctly
+    for suite_name, suite_details in suites.items():
+        gn._verifier._gatherer = mock.Mock(framework_gatherers={"raptor": gatherer})
+        section = gn._verifier._gatherer.framework_gatherers[
+            "raptor"
+        ].build_suite_section(fg, suite_name, suites.get(suite_name)["description"])
+        assert suite_name.capitalize() == section[0]
+        assert suite_name in section[2]
+
+        tests = suites.get(suite_name).get("tests", {})
+        for test_name in tests.keys():
+            desc = gn._verifier._gatherer.framework_gatherers[
+                "raptor"
+            ].build_test_description(fg, test_name, tests[test_name], suite_name)
+            assert f"**test url**: `<{url[0]['test_url']}>`__" in desc[0]
+            assert f"**expected**: {url[0]['expected']}" in desc[0]
+            assert test_name in desc[0]
+
+
+def test_perfdocs_logger_failure(config, paths):
+    from perfdocs.logger import PerfDocLogger
+
+    PerfDocLogger.LOGGER = None
+    with pytest.raises(Exception):
+        PerfDocLogger()
+
+    PerfDocLogger.PATHS = []
+    with pytest.raises(Exception):
+        PerfDocLogger()
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_perfdocs_generation.py b/tools/lint/test/test_perfdocs_generation.py
new file mode 100644
index 0000000000..29b1555467
--- /dev/null
+++ b/tools/lint/test/test_perfdocs_generation.py
@@ -0,0 +1,297 @@
+import os
+import pathlib
+from unittest import mock
+
+import mozunit
+
+LINTER = "perfdocs"
+
+
+def setup_sample_logger(logger, structured_logger, top_dir):
+    from perfdocs.logger import PerfDocLogger
+
+    PerfDocLogger.LOGGER = structured_logger
+    PerfDocLogger.PATHS = ["perfdocs"]
+    PerfDocLogger.TOP_DIR = top_dir
+
+    import perfdocs.gatherer as gt
+    import perfdocs.generator as gn
+    import perfdocs.utils as utils
+    import perfdocs.verifier as vf
+
+    gt.logger = logger
+    vf.logger = logger
+    gn.logger = logger
+    utils.logger = logger
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_generator_generate_perfdocs_pass(
+    logger, structured_logger, perfdocs_sample
+):
+    from test_perfdocs import temp_file
+
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    templates_dir = pathlib.Path(top_dir, "tools", "lint", "perfdocs", "templates")
+    templates_dir.mkdir(parents=True, exist_ok=True)
+
+    from perfdocs.generator import Generator
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    verifier.validate_tree()
+
+    generator = Generator(verifier, generate=True, workspace=top_dir)
+    with temp_file("index.rst", tempdir=templates_dir, content="{test_documentation}"):
+        generator.generate_perfdocs()
+
+    assert logger.warning.call_count == 0
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_generator_needed_regeneration(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.generator import Generator
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    verifier.validate_tree()
+
+    generator = Generator(verifier, generate=False, workspace=top_dir)
+    generator.generate_perfdocs()
+
+    expected = "PerfDocs need to be regenerated."
+    args, _ = logger.warning.call_args
+
+    assert logger.warning.call_count == 1
+    assert args[0] == expected
+
+
+@mock.patch("perfdocs.generator.get_changed_files", new=lambda x: [])
+@mock.patch("perfdocs.generator.ON_TRY", new=True)
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_generator_needed_update(logger, structured_logger, perfdocs_sample):
+    from test_perfdocs import temp_file
+
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    templates_dir = pathlib.Path(top_dir, "tools", "lint", "perfdocs", "templates")
+    templates_dir.mkdir(parents=True, exist_ok=True)
+
+    from perfdocs.generator import Generator
+    from perfdocs.verifier import Verifier
+
+    # Initializing perfdocs
+    verifier = Verifier(top_dir)
+    verifier.validate_tree()
+
+    generator = Generator(verifier, generate=True, workspace=top_dir)
+    with temp_file("index.rst", tempdir=templates_dir, content="{test_documentation}"):
+        generator.generate_perfdocs()
+
+        # Removed file for testing and run again
+        generator._generate = False
+        files = [f for f in os.listdir(generator.perfdocs_path)]
+        for f in files:
+            os.remove(str(pathlib.Path(generator.perfdocs_path, f)))
+
+        generator.generate_perfdocs()
+
+    expected = (
+        "PerfDocs are outdated, run ./mach lint -l perfdocs --fix .` to update them. "
+        "You can also apply the perfdocs.diff patch file produced from this "
+        "reviewbot test to fix the issue."
+    )
+    args, _ = logger.warning.call_args
+
+    assert logger.warning.call_count == 1
+    assert args[0] == expected
+
+    # Check to ensure a diff was produced
+    assert logger.log.call_count == 6
+
+    logs = [v[0][0] for v in logger.log.call_args_list]
+    for failure_log in (
+        "Some files are missing or are funny.",
+        "Missing in existing docs: index.rst",
+        "Missing in existing docs: mozperftest.rst",
+    ):
+        assert failure_log in logs
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_generator_created_perfdocs(
+    logger, structured_logger, perfdocs_sample
+):
+    from test_perfdocs import temp_file
+
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    templates_dir = pathlib.Path(top_dir, "tools", "lint", "perfdocs", "templates")
+    templates_dir.mkdir(parents=True, exist_ok=True)
+
+    from perfdocs.generator import Generator
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    verifier.validate_tree()
+
+    generator = Generator(verifier, generate=True, workspace=top_dir)
+    with temp_file("index.rst", tempdir=templates_dir, content="{test_documentation}"):
+        perfdocs_tmpdir = generator._create_perfdocs()
+
+    files = [f for f in os.listdir(perfdocs_tmpdir)]
+    files.sort()
+    expected_files = ["index.rst", "mozperftest.rst"]
+
+    for i, file in enumerate(files):
+        assert file == expected_files[i]
+
+    with pathlib.Path(perfdocs_tmpdir, expected_files[0]).open() as f:
+        filedata = f.readlines()
+    assert "".join(filedata) == "  * :doc:`mozperftest`"
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_generator_build_perfdocs(logger, structured_logger, perfdocs_sample):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.generator import Generator
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    verifier.validate_tree()
+
+    generator = Generator(verifier, generate=True, workspace=top_dir)
+    frameworks_info = generator.build_perfdocs_from_tree()
+
+    expected = ["dynamic", "static"]
+
+    for framework in sorted(frameworks_info.keys()):
+        for i, framework_info in enumerate(frameworks_info[framework]):
+            assert framework_info == expected[i]
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_generator_create_temp_dir(logger, structured_logger, perfdocs_sample):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.generator import Generator
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    verifier.validate_tree()
+
+    generator = Generator(verifier, generate=True, workspace=top_dir)
+    tmpdir = generator._create_temp_dir()
+
+    assert pathlib.Path(tmpdir).is_dir()
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_generator_create_temp_dir_fail(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.generator import Generator
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    verifier.validate_tree()
+
+    generator = Generator(verifier, generate=True, workspace=top_dir)
+    with mock.patch("perfdocs.generator.pathlib") as path_mock:
+        path_mock.Path().mkdir.side_effect = OSError()
+        path_mock.Path().is_dir.return_value = False
+        tmpdir = generator._create_temp_dir()
+
+    expected = "Error creating temp file: "
+    args, _ = logger.critical.call_args
+
+    assert not tmpdir
+    assert logger.critical.call_count == 1
+    assert args[0] == expected
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_generator_save_perfdocs_pass(
+    logger, structured_logger, perfdocs_sample
+):
+    from test_perfdocs import temp_file
+
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    templates_dir = pathlib.Path(top_dir, "tools", "lint", "perfdocs", "templates")
+    templates_dir.mkdir(parents=True, exist_ok=True)
+
+    from perfdocs.generator import Generator
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    verifier.validate_tree()
+
+    generator = Generator(verifier, generate=True, workspace=top_dir)
+
+    assert not generator.perfdocs_path.is_dir()
+
+    with temp_file("index.rst", tempdir=templates_dir, content="{test_documentation}"):
+        perfdocs_tmpdir = generator._create_perfdocs()
+
+    generator._save_perfdocs(perfdocs_tmpdir)
+
+    expected = ["index.rst", "mozperftest.rst"]
+    files = [f for f in os.listdir(generator.perfdocs_path)]
+    files.sort()
+
+    for i, file in enumerate(files):
+        assert file == expected[i]
+
+
+@mock.patch("perfdocs.generator.shutil")
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_generator_save_perfdocs_fail(
+    logger, shutil, structured_logger, perfdocs_sample
+):
+    from test_perfdocs import temp_file
+
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    templates_dir = pathlib.Path(top_dir, "tools", "lint", "perfdocs", "templates")
+    templates_dir.mkdir(parents=True, exist_ok=True)
+
+    from perfdocs.generator import Generator
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    verifier.validate_tree()
+
+    generator = Generator(verifier, generate=True, workspace=top_dir)
+    with temp_file("index.rst", tempdir=templates_dir, content="{test_documentation}"):
+        perfdocs_tmpdir = generator._create_perfdocs()
+
+    shutil.copytree = mock.Mock(side_effect=Exception())
+    generator._save_perfdocs(perfdocs_tmpdir)
+
+    expected = "There was an error while saving the documentation: "
+    args, _ = logger.critical.call_args
+
+    assert logger.critical.call_count == 1
+    assert args[0] == expected
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_perfdocs_helpers.py b/tools/lint/test/test_perfdocs_helpers.py
new file mode 100644
index 0000000000..02c1abfecc
--- /dev/null
+++ b/tools/lint/test/test_perfdocs_helpers.py
@@ -0,0 +1,206 @@
+import mozunit
+import pytest
+
+LINTER = "perfdocs"
+
+testdata = [
+    {
+        "table_specifications": {
+            "title": ["not a string"],
+            "widths": [10, 10, 10, 10],
+            "header_rows": 1,
+            "headers": [["Coconut 1", "Coconut 2", "Coconut 3"]],
+            "indent": 2,
+        },
+        "error_msg": "TableBuilder attribute title must be a string.",
+    },
+    {
+        "table_specifications": {
+            "title": "I've got a lovely bunch of coconuts",
+            "widths": ("not", "a", "list"),
+            "header_rows": 1,
+            "headers": [["Coconut 1", "Coconut 2", "Coconut 3"]],
+            "indent": 2,
+        },
+        "error_msg": "TableBuilder attribute widths must be a list of integers.",
+    },
+    {
+        "table_specifications": {
+            "title": "There they are all standing in a row",
+            "widths": ["not an integer"],
+            "header_rows": 1,
+            "headers": [["Coconut 1", "Coconut 2", "Coconut 3"]],
+            "indent": 2,
+        },
+        "error_msg": "TableBuilder attribute widths must be a list of integers.",
+    },
+    {
+        "table_specifications": {
+            "title": "Big ones, small ones",
+            "widths": [10, 10, 10, 10],
+            "header_rows": "not an integer",
+            "headers": [["Coconut 1", "Coconut 2", "Coconut 3"]],
+            "indent": 2,
+        },
+        "error_msg": "TableBuilder attribute header_rows must be an integer.",
+    },
+    {
+        "table_specifications": {
+            "title": "Some as big as your head!",
+            "widths": [10, 10, 10, 10],
+            "header_rows": 1,
+            "headers": ("not", "a", "list"),
+            "indent": 2,
+        },
+        "error_msg": "TableBuilder attribute headers must be a two-dimensional list of strings.",
+    },
+    {
+        "table_specifications": {
+            "title": "(And bigger)",
+            "widths": [10, 10, 10, 10],
+            "header_rows": 1,
+            "headers": ["not", "two", "dimensional"],
+            "indent": 2,
+        },
+        "error_msg": "TableBuilder attribute headers must be a two-dimensional list of strings.",
+    },
+    {
+        "table_specifications": {
+            "title": "Give 'em a twist, a flick of the wrist'",
+            "widths": [10, 10, 10, 10],
+            "header_rows": 1,
+            "headers": [[1, 2, 3]],
+            "indent": 2,
+        },
+        "error_msg": "TableBuilder attribute headers must be a two-dimensional list of strings.",
+    },
+    {
+        "table_specifications": {
+            "title": "That's what the showman said!",
+            "widths": [10, 10, 10, 10],
+            "header_rows": 1,
+            "headers": [["Coconut 1", "Coconut 2", "Coconut 3"]],
+            "indent": "not an integer",
+        },
+        "error_msg": "TableBuilder attribute indent must be an integer.",
+    },
+]
+
+table_specifications = {
+    "title": "I've got a lovely bunch of coconuts",
+    "widths": [10, 10, 10],
+    "header_rows": 1,
+    "headers": [["Coconut 1", "Coconut 2", "Coconut 3"]],
+    "indent": 2,
+}
+
+
+@pytest.mark.parametrize("testdata", testdata)
+def test_table_builder_invalid_attributes(testdata):
+    from perfdocs.doc_helpers import TableBuilder
+
+    table_specifications = testdata["table_specifications"]
+    error_msg = testdata["error_msg"]
+
+    with pytest.raises(TypeError) as error:
+        TableBuilder(
+            table_specifications["title"],
+            table_specifications["widths"],
+            table_specifications["header_rows"],
+            table_specifications["headers"],
+            table_specifications["indent"],
+        )
+
+    assert str(error.value) == error_msg
+
+
+def test_table_builder_mismatched_columns():
+    from perfdocs.doc_helpers import MismatchedRowLengthsException, TableBuilder
+
+    table_specifications = {
+        "title": "I've got a lovely bunch of coconuts",
+        "widths": [10, 10, 10, 42],
+        "header_rows": 1,
+        "headers": [["Coconut 1", "Coconut 2", "Coconut 3"]],
+        "indent": 2,
+    }
+
+    with pytest.raises(MismatchedRowLengthsException) as error:
+        TableBuilder(
+            table_specifications["title"],
+            table_specifications["widths"],
+            table_specifications["header_rows"],
+            table_specifications["headers"],
+            table_specifications["indent"],
+        )
+    assert (
+        str(error.value)
+        == "Number of table headers must match number of column widths."
+    )
+
+
+def test_table_builder_add_row_too_long():
+    from perfdocs.doc_helpers import MismatchedRowLengthsException, TableBuilder
+
+    table = TableBuilder(
+        table_specifications["title"],
+        table_specifications["widths"],
+        table_specifications["header_rows"],
+        table_specifications["headers"],
+        table_specifications["indent"],
+    )
+    with pytest.raises(MismatchedRowLengthsException) as error:
+        table.add_row(
+            ["big ones", "small ones", "some as big as your head!", "(and bigger)"]
+        )
+    assert (
+        str(error.value)
+        == "Number of items in a row must must number of columns defined."
+    )
+
+
+def test_table_builder_add_rows_type_error():
+    from perfdocs.doc_helpers import TableBuilder
+
+    table = TableBuilder(
+        table_specifications["title"],
+        table_specifications["widths"],
+        table_specifications["header_rows"],
+        table_specifications["headers"],
+        table_specifications["indent"],
+    )
+    with pytest.raises(TypeError) as error:
+        table.add_rows(
+            ["big ones", "small ones", "some as big as your head!", "(and bigger)"]
+        )
+    assert str(error.value) == "add_rows() requires a two-dimensional list of strings."
+
+
+def test_table_builder_validate():
+    from perfdocs.doc_helpers import TableBuilder
+
+    table = TableBuilder(
+        table_specifications["title"],
+        table_specifications["widths"],
+        table_specifications["header_rows"],
+        table_specifications["headers"],
+        table_specifications["indent"],
+    )
+    table.add_row(["big ones", "small ones", "some as big as your head!"])
+    table.add_row(
+        ["Give 'em a twist", "A flick of the wrist", "That's what the showman said!"]
+    )
+    table = table.finish_table()
+    print(table)
+    assert (
+        table == "  .. list-table:: **I've got a lovely bunch of coconuts**\n"
+        "     :widths: 10 10 10\n     :header-rows: 1\n\n"
+        "     * - **Coconut 1**\n       - Coconut 2\n       - Coconut 3\n"
+        "     * - **big ones**\n       - small ones\n       - some as big as your head!\n"
+        "     * - **Give 'em a twist**\n       - A flick of the wrist\n"
+        "       - That's what the showman said!\n\n"
+    )
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_rst.py b/tools/lint/test/test_rst.py
new file mode 100644
index 0000000000..e540081a94
--- /dev/null
+++ b/tools/lint/test/test_rst.py
@@ -0,0 +1,25 @@
+import mozunit
+import pytest
+from mozfile import which
+
+LINTER = "rst"
+pytestmark = pytest.mark.skipif(
+    not which("rstcheck"), reason="rstcheck is not installed"
+)
+
+
+def test_basic(lint, paths):
+    results = lint(paths())
+    assert len(results) == 2
+
+    assert "Title underline too short" in results[0].message
+    assert results[0].level == "error"
+    assert results[0].relpath == "bad.rst"
+
+    assert "Title overline & underline mismatch" in results[1].message
+    assert results[1].level == "error"
+    assert results[1].relpath == "bad2.rst"
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_ruff.py b/tools/lint/test/test_ruff.py
new file mode 100644
index 0000000000..fbb483780e
--- /dev/null
+++ b/tools/lint/test/test_ruff.py
@@ -0,0 +1,39 @@
+# -*- coding: utf-8 -*-
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from pprint import pprint
+from textwrap import dedent
+
+import mozunit
+
+LINTER = "ruff"
+fixed = 0
+
+
+def test_lint_fix(lint, create_temp_file):
+    contents = dedent(
+        """
+    import distutils
+    print("hello!")
+    """
+    )
+
+    path = create_temp_file(contents, "bad.py")
+    lint([path], fix=True)
+    assert fixed == 1
+
+
+def test_lint_ruff(lint, paths):
+    results = lint(paths())
+    pprint(results, indent=2)
+    assert len(results) == 2
+    assert results[0].level == "error"
+    assert results[0].relpath == "bad.py"
+    assert "`distutils` imported but unused" in results[0].message
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_rustfmt.py b/tools/lint/test/test_rustfmt.py
new file mode 100644
index 0000000000..c176a2695d
--- /dev/null
+++ b/tools/lint/test/test_rustfmt.py
@@ -0,0 +1,70 @@
+import mozunit
+
+LINTER = "rustfmt"
+fixed = 0
+
+
+def test_good(lint, config, paths):
+    results = lint(paths("subdir/good.rs"))
+    print(results)
+    assert len(results) == 0
+
+
+def test_basic(lint, config, paths):
+    results = lint(paths("subdir/bad.rs"))
+    print(results)
+    assert len(results) >= 1
+
+    assert "Reformat rust" in results[0].message
+    assert results[0].level == "warning"
+    assert results[0].lineno == 4
+    assert "bad.rs" in results[0].path
+    assert "Print text to the console" in results[0].diff
+
+
+def test_dir(lint, config, paths):
+    results = lint(paths("subdir/"))
+    print(results)
+    assert len(results) >= 4
+
+    assert "Reformat rust" in results[0].message
+    assert results[0].level == "warning"
+    assert results[0].lineno == 4
+    assert "bad.rs" in results[0].path
+    assert "Print text to the console" in results[0].diff
+
+    assert "Reformat rust" in results[1].message
+    assert results[1].level == "warning"
+    assert results[1].lineno == 4
+    assert "bad2.rs" in results[1].path
+    assert "Print text to the console" in results[1].diff
+
+
+def test_fix(lint, create_temp_file):
+
+    contents = """fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+    let mut a;
+    let mut b=1;
+    let mut vec = Vec::new();
+    vec.push(1);
+    vec.push(2);
+
+
+    for x in 5..10 - 5 {
+        a = x;
+    }
+
+    }
+"""
+
+    path = create_temp_file(contents, "bad.rs")
+    lint([path], fix=True)
+    assert fixed == 3
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_shellcheck.py b/tools/lint/test/test_shellcheck.py
new file mode 100644
index 0000000000..1b41e298bd
--- /dev/null
+++ b/tools/lint/test/test_shellcheck.py
@@ -0,0 +1,26 @@
+import mozunit
+import pytest
+from mozfile import which
+
+LINTER = "shellcheck"
+pytestmark = pytest.mark.skipif(
+    not which("shellcheck"), reason="shellcheck is not installed"
+)
+
+
+def test_basic(lint, paths):
+    results = lint(paths())
+    print(results)
+    assert len(results) == 2
+
+    assert "hello appears unused" in results[0].message
+    assert results[0].level == "error"
+    assert results[0].relpath == "bad.sh"
+
+    assert "Double quote to prevent" in results[1].message
+    assert results[1].level == "error"
+    assert results[1].relpath == "bad.sh"
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_stylelint.py b/tools/lint/test/test_stylelint.py
new file mode 100644
index 0000000000..5d758ad318
--- /dev/null
+++ b/tools/lint/test/test_stylelint.py
@@ -0,0 +1,65 @@
+import mozunit
+import pytest
+from conftest import build
+
+LINTER = "stylelint"
+fixed = 0
+
+
+@pytest.fixture
+def stylelint(lint):
+    def inner(*args, **kwargs):
+        # --ignore-path is because stylelint doesn't have the --no-ignore option
+        # and therefore needs to be given an empty file for the tests to work.
+        kwargs["extra_args"] = [
+            "--ignore-path=tools/lint/test/files/eslint/testprettierignore",
+        ]
+        return lint(*args, **kwargs)
+
+    return inner
+
+
+def test_lint_with_global_exclude(lint, config, paths):
+    config["exclude"] = ["subdir", "import"]
+    # This uses lint directly as we need to not ignore the excludes.
+    results = lint(paths(), config=config, root=build.topsrcdir)
+    assert len(results) == 0
+
+
+def test_no_files_to_lint(stylelint, config, paths):
+    # A directory with no files to lint.
+    results = stylelint(paths("nolint"), root=build.topsrcdir)
+    assert results == []
+
+    # Errors still show up even when a directory with no files is passed in.
+    results = stylelint(paths("nolint", "subdir/bad.css"), root=build.topsrcdir)
+    assert len(results) == 1
+
+
+def test_stylelint(stylelint, config, create_temp_file):
+    contents = """#foo {
+    font-size: 12px;
+    font-size: 12px;
+}
+"""
+    path = create_temp_file(contents, "bad.css")
+    results = stylelint([path], config=config, root=build.topsrcdir)
+
+    assert len(results) == 1
+
+
+def test_stylelint_fix(stylelint, config, create_temp_file):
+    contents = """#foo {
+    font-size: 12px;
+    font-size: 12px;
+}
+"""
+    path = create_temp_file(contents, "bad.css")
+    stylelint([path], config=config, root=build.topsrcdir, fix=True)
+
+    # stylelint returns counts of files fixed, not errors fixed.
+    assert fixed == 1
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_trojan_source.py b/tools/lint/test/test_trojan_source.py
new file mode 100644
index 0000000000..64a3789c37
--- /dev/null
+++ b/tools/lint/test/test_trojan_source.py
@@ -0,0 +1,25 @@
+import mozunit
+
+LINTER = "trojan-source"
+
+
+def test_lint_trojan_source(lint, paths):
+    results = lint(paths())
+    print(results)
+    assert len(results) == 3
+
+    assert "disallowed characters" in results[0].message
+    assert results[0].level == "error"
+    assert "commenting-out.cpp" in results[0].relpath
+
+    assert "disallowed characters" in results[1].message
+    assert results[1].level == "error"
+    assert "early-return.py" in results[1].relpath
+
+    assert "disallowed characters" in results[2].message
+    assert results[2].level == "error"
+    assert "invisible-function.rs" in results[2].relpath
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_updatebot.py b/tools/lint/test/test_updatebot.py
new file mode 100644
index 0000000000..55842e99c0
--- /dev/null
+++ b/tools/lint/test/test_updatebot.py
@@ -0,0 +1,44 @@
+import os
+
+import mozunit
+
+LINTER = "updatebot"
+
+
+def test_basic(lint, paths):
+    results = []
+
+    for p in paths():
+        for (root, dirs, files) in os.walk(p):
+            for f in files:
+                if f == ".yamllint":
+                    continue
+
+                filepath = os.path.join(root, f)
+                result = lint(filepath, testing=True)
+                if result:
+                    results.append(result)
+
+    assert len(results) == 2
+
+    expected_results = 0
+
+    for r in results:
+        if "no-revision.yaml" in r[0].path:
+            expected_results += 1
+            assert "no-revision.yaml" in r[0].path
+            assert (
+                'If "vendoring" is present, "revision" must be present in "origin"'
+                in r[0].message
+            )
+
+        if "cargo-mismatch.yaml" in r[0].path:
+            expected_results += 1
+            assert "cargo-mismatch.yaml" in r[0].path
+            assert "wasn't found in Cargo.lock" in r[0].message
+
+    assert expected_results == 2
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_yaml.py b/tools/lint/test/test_yaml.py
new file mode 100644
index 0000000000..63b678d152
--- /dev/null
+++ b/tools/lint/test/test_yaml.py
@@ -0,0 +1,28 @@
+import mozunit
+
+LINTER = "yaml"
+
+
+def test_basic(lint, paths):
+    results = lint(paths())
+
+    assert len(results) == 3
+
+    assert "line too long (122 > 80 characters)" in results[0].message
+    assert results[0].level == "error"
+    assert "bad.yml" in results[0].relpath
+    assert results[0].lineno == 3
+
+    assert "wrong indentation: expected 4 but found 8" in results[1].message
+    assert results[1].level == "error"
+    assert "bad.yml" in results[1].relpath
+    assert results[0].lineno == 3
+
+    assert "could not find expected" in results[2].message
+    assert results[2].level == "error"
+    assert "bad.yml" in results[2].relpath
+    assert results[2].lineno == 9
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/tox/tox_requirements.txt b/tools/lint/tox/tox_requirements.txt
new file mode 100644
index 0000000000..4ec4191443
--- /dev/null
+++ b/tools/lint/tox/tox_requirements.txt
@@ -0,0 +1,7 @@
+pluggy==0.13.1 --hash=sha256:966c145cd83c96502c3c3868f50408687b38434af77734af1e9ca461a4081d2d
+importlib-metadata==0.23 --hash=sha256:d5f18a79777f3aa179c145737780282e27b508fc8fd688cb17c7a813e8bd39af
+more-itertools==7.2.0 --hash=sha256:92b8c4b06dac4f0611c0729b2f2ede52b2e1bac1ab48f089c7ddc12e26bb60c4
+zipp==0.6.0 --hash=sha256:f06903e9f1f43b12d371004b4ac7b06ab39a44adc747266928ae6debfa7b3335
+py==1.5.4 --hash=sha256:e31fb2767eb657cbde86c454f02e99cb846d3cd9d61b318525140214fdc0e98e
+tox==2.7.0 --hash=sha256:0f37ea637ead4a5bbae91531b0bf8fd327c7152e20255e5960ee180598228d21
+virtualenv==15.1.0 --hash=sha256:39d88b533b422825d644087a21e78c45cf5af0ef7a99a1fc9fbb7b481e5c85b0
diff --git a/tools/lint/trojan-source.yml b/tools/lint/trojan-source.yml
new file mode 100644
index 0000000000..9b25962b2e
--- /dev/null
+++ b/tools/lint/trojan-source.yml
@@ -0,0 +1,27 @@
+---
+trojan-source:
+    description: Trojan Source attack - CVE-2021-42572
+    include:
+        - .
+    exclude:
+        - intl/lwbrk/rulebrk.c
+        - testing/web-platform/tests/conformance-checkers/tools/ins-del-datetime.py
+        - modules/freetype2/src/autofit/afblue.c
+        - modules/freetype2/builds/amiga/include/config/ftconfig.h
+        - modules/freetype2/builds/amiga/include/config/ftmodule.h
+        - modules/freetype2/builds/amiga/src/base/ftsystem.c
+        - third_party/rust/chardetng/src/data.rs
+        - third_party/rust/error-chain/tests/tests.rs
+        - third_party/rust/unicode-width/src/tests.rs
+        - security/nss/gtests/mozpkix_gtest/pkixnames_tests.cpp
+    extensions:
+        - .c
+        - .cc
+        - .cpp
+        - .h
+        - .py
+        - .rs
+    support-files:
+        - 'tools/lint/trojan-source/**'
+    type: external
+    payload: trojan-source:lint
diff --git a/tools/lint/trojan-source/__init__.py b/tools/lint/trojan-source/__init__.py
new file mode 100644
index 0000000000..a20c10203d
--- /dev/null
+++ b/tools/lint/trojan-source/__init__.py
@@ -0,0 +1,67 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import sys
+import unicodedata
+
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+# Code inspired by Red Hat
+# https://github.com/siddhesh/find-unicode-control/
+# published under the 'BSD 3-Clause' license
+# https://access.redhat.com/security/vulnerabilities/RHSB-2021-007
+
+results = []
+
+disallowed = set(
+    chr(c) for c in range(sys.maxunicode) if unicodedata.category(chr(c)) == "Cf"
+)
+
+
+def getfiletext(config, filename):
+    # Make a text string from a file, attempting to decode from latin1 if necessary.
+    # Other non-utf-8 locales are not supported at the moment.
+    with open(filename, "rb") as infile:
+        try:
+            return infile.read().decode("utf-8")
+        except Exception as e:
+            res = {
+                "path": filename,
+                "message": "Could not open file as utf-8 - maybe an encoding error: %s"
+                % e,
+                "level": "error",
+            }
+            results.append(result.from_config(config, **res))
+            return None
+
+    return None
+
+
+def analyze_text(filename, text, disallowed):
+    line = 0
+    for t in text.splitlines():
+        line = line + 1
+        subset = [c for c in t if chr(ord(c)) in disallowed]
+        if subset:
+            return (subset, line)
+
+    return ("", 0)
+
+
+def lint(paths, config, **lintargs):
+    files = list(expand_exclusions(paths, config, lintargs["root"]))
+    for f in files:
+        text = getfiletext(config, f)
+        if text:
+            (subset, line) = analyze_text(f, text, disallowed)
+            if subset:
+                res = {
+                    "path": f,
+                    "lineno": line,
+                    "message": "disallowed characters: %s" % subset,
+                    "level": "error",
+                }
+                results.append(result.from_config(config, **res))
+
+    return {"results": results, "fixed": 0}
diff --git a/tools/lint/updatebot.yml b/tools/lint/updatebot.yml
new file mode 100644
index 0000000000..90f13e8cf4
--- /dev/null
+++ b/tools/lint/updatebot.yml
@@ -0,0 +1,9 @@
+---
+updatebot:
+    description: >
+      "Ensure moz.yaml files are valid"
+    extensions: ['yaml']
+    include: ['.']
+    type: external-file
+    level: error
+    payload: updatebot.validate_yaml:lint
diff --git a/tools/lint/updatebot/__init__.py b/tools/lint/updatebot/__init__.py
new file mode 100644
index 0000000000..c580d191c1
--- /dev/null
+++ b/tools/lint/updatebot/__init__.py
@@ -0,0 +1,3 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
diff --git a/tools/lint/updatebot/validate_yaml.py b/tools/lint/updatebot/validate_yaml.py
new file mode 100644
index 0000000000..802a9033fa
--- /dev/null
+++ b/tools/lint/updatebot/validate_yaml.py
@@ -0,0 +1,52 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from mozbuild.vendor.moz_yaml import load_moz_yaml
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+
+class UpdatebotValidator:
+    def lint_file(self, path, **kwargs):
+        if not kwargs.get("testing", False) and not path.endswith("moz.yaml"):
+            # When testing, process all files provided
+            return None
+        if not kwargs.get("testing", False) and "test/files/updatebot" in path:
+            # When not testing, ignore the test files
+            return None
+
+        try:
+            yaml = load_moz_yaml(path)
+
+            if "vendoring" in yaml and yaml["vendoring"].get("flavor", None) == "rust":
+                yaml_revision = yaml["origin"]["revision"]
+
+                with open("Cargo.lock", "r") as f:
+                    for line in f:
+                        if yaml_revision in line:
+                            return None
+
+                return f"Revision {yaml_revision} specified in {path} wasn't found in Cargo.lock"
+
+            return None
+        except Exception as e:
+            return f"Could not load {path} according to schema in moz_yaml.py: {e}"
+
+
+def lint(paths, config, **lintargs):
+    # expand_exclusions expects a list, and will convert a string
+    # into it if it doesn't receive one
+    if not isinstance(paths, list):
+        paths = [paths]
+
+    errors = []
+    files = list(expand_exclusions(paths, config, lintargs["root"]))
+
+    m = UpdatebotValidator()
+    for f in files:
+        message = m.lint_file(f, **lintargs)
+        if message:
+            errors.append(result.from_config(config, path=f, message=message))
+
+    return errors
diff --git a/tools/lint/wpt.yml b/tools/lint/wpt.yml
new file mode 100644
index 0000000000..dd3c0dd042
--- /dev/null
+++ b/tools/lint/wpt.yml
@@ -0,0 +1,10 @@
+---
+wpt:
+    description: web-platform-tests lint
+    include:
+        - testing/web-platform/tests
+    exclude: []
+    support-files:
+        - tools/lint/wpt/wpt.py
+    type: external
+    payload: wpt.wpt:lint
diff --git a/tools/lint/wpt/__init__.py b/tools/lint/wpt/__init__.py
new file mode 100644
index 0000000000..c580d191c1
--- /dev/null
+++ b/tools/lint/wpt/__init__.py
@@ -0,0 +1,3 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
diff --git a/tools/lint/wpt/wpt.py b/tools/lint/wpt/wpt.py
new file mode 100644
index 0000000000..1bbb0a6a65
--- /dev/null
+++ b/tools/lint/wpt/wpt.py
@@ -0,0 +1,59 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import os
+import sys
+
+from mozlint import result
+from mozprocess import ProcessHandler
+
+results = []
+
+
+def lint(files, config, **kwargs):
+    log = kwargs["log"]
+    tests_dir = os.path.join(kwargs["root"], "testing", "web-platform", "tests")
+
+    def process_line(line):
+        try:
+            data = json.loads(line)
+        except ValueError:
+            return
+
+        data["level"] = "error"
+        data["path"] = os.path.relpath(
+            os.path.join(tests_dir, data["path"]), kwargs["root"]
+        )
+        data.setdefault("lineno", 0)
+        results.append(result.from_config(config, **data))
+
+    if files == [tests_dir]:
+        print(
+            "No specific files specified, running the full wpt lint" " (this is slow)",
+            file=sys.stderr,
+        )
+        files = ["--all"]
+    cmd = ["python3", os.path.join(tests_dir, "wpt"), "lint", "--json"] + files
+    log.debug("Command: {}".format(" ".join(cmd)))
+
+    proc = ProcessHandler(
+        cmd, env=os.environ, processOutputLine=process_line, universal_newlines=True
+    )
+    proc.run()
+    try:
+        proc.wait()
+        if proc.returncode != 0:
+            results.append(
+                result.from_config(
+                    config,
+                    message="Lint process exited with return code %s" % proc.returncode,
+                )
+            )
+    except KeyboardInterrupt:
+        proc.kill()
+
+    return results
diff --git a/tools/lint/yaml.yml b/tools/lint/yaml.yml
new file mode 100644
index 0000000000..47cde80177
--- /dev/null
+++ b/tools/lint/yaml.yml
@@ -0,0 +1,19 @@
+---
+yamllint:
+    description: YAML linter
+    include:
+        - .cron.yml
+        - .taskcluster.yml
+        - browser/config/
+        - python/mozlint/
+        - security/nss/.taskcluster.yml
+        - taskcluster
+        - testing/mozharness
+        - tools
+        - build/cargo
+    extensions: ['yml', 'yaml']
+    support-files:
+        - '**/.yamllint'
+        - 'tools/lint/yamllint_/**'
+    type: external
+    payload: yamllint_:lint
diff --git a/tools/lint/yamllint_/__init__.py b/tools/lint/yamllint_/__init__.py
new file mode 100644
index 0000000000..2244fabd3f
--- /dev/null
+++ b/tools/lint/yamllint_/__init__.py
@@ -0,0 +1,101 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import re
+import sys
+from collections import defaultdict
+
+from mozbuild.base import MozbuildObject
+
+topsrcdir = MozbuildObject.from_environment().topsrcdir
+
+from mozlint import result
+from mozlint.pathutils import get_ancestors_by_name
+from mozlint.util.implementation import LintProcess
+
+YAMLLINT_FORMAT_REGEX = re.compile("(.*):(.*):(.*): \[(error|warning)\] (.*) \((.*)\)$")
+
+results = []
+
+
+class YAMLLintProcess(LintProcess):
+    def process_line(self, line):
+        try:
+            match = YAMLLINT_FORMAT_REGEX.match(line)
+            abspath, line, col, level, message, code = match.groups()
+        except AttributeError:
+            print("Unable to match yaml regex against output: {}".format(line))
+            return
+
+        res = {
+            "path": os.path.relpath(str(abspath), self.config["root"]),
+            "message": str(message),
+            "level": "error",
+            "lineno": line,
+            "column": col,
+            "rule": code,
+        }
+
+        results.append(result.from_config(self.config, **res))
+
+
+def get_yamllint_version():
+    from yamllint import APP_VERSION
+
+    return APP_VERSION
+
+
+def run_process(config, cmd):
+    proc = YAMLLintProcess(config, cmd)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+
+def gen_yamllint_args(cmdargs, paths=None, conf_file=None):
+    args = cmdargs[:]
+    if isinstance(paths, str):
+        paths = [paths]
+    if conf_file and conf_file != "default":
+        return args + ["-c", conf_file] + paths
+    return args + paths
+
+
+def lint(files, config, **lintargs):
+    log = lintargs["log"]
+
+    log.debug("Version: {}".format(get_yamllint_version()))
+
+    cmdargs = [
+        sys.executable,
+        os.path.join(topsrcdir, "mach"),
+        "python",
+        "--",
+        "-m",
+        "yamllint",
+        "-f",
+        "parsable",
+    ]
+    log.debug("Command: {}".format(" ".join(cmdargs)))
+
+    config = config.copy()
+    config["root"] = lintargs["root"]
+
+    # Run any paths with a .yamllint file in the directory separately so
+    # it gets picked up. This means only .yamllint files that live in
+    # directories that are explicitly included will be considered.
+    paths_by_config = defaultdict(list)
+    for f in files:
+        conf_files = get_ancestors_by_name(".yamllint", f, config["root"])
+        paths_by_config[conf_files[0] if conf_files else "default"].append(f)
+
+    for conf_file, paths in paths_by_config.items():
+        run_process(
+            config, gen_yamllint_args(cmdargs, conf_file=conf_file, paths=paths)
+        )
+
+    return results
-- 
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