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diff --git a/.eslintignore b/.eslintignore
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+# Please DO NOT add more third party files to this file.
+# They should be added to tools/rewriting/ThirdPartyPaths.txt instead.
+#
+# Please also DO NOT add  generated files that are for some reason checked
+# into source - add them to tools/rewriting/Generated.txt instead.
+
+# This file should only be used for exclusions where we have:
+# - preprocessed files
+# - intentionally invalid files
+# - build directories and other items that we need to ignore
+
+# Include all js dot files.
+!.*.js
+
+# Ignore VSCode files
+.vscode/
+
+# Always ignore node_modules.
+**/node_modules/
+
+# Always ignore crashtests - specially crafted files that originally caused a
+# crash.
+**/crashtests/
+# Also ignore reftest - specially crafted to produce expected output.
+**/reftest/
+**/reftests/
+# Don't ignore the reftest harness files.
+!/layout/tools/reftest/
+
+# Exclude expected objdirs.
+obj*/
+
+# build/ third-party code
+build/pgo/js-input/
+
+# browser/ exclusions
+browser/app/
+browser/branding/**/firefox-branding.js
+# Gzipped test file.
+browser/base/content/test/general/gZipOfflineChild.html
+browser/base/content/test/urlbar/file_blank_but_not_blank.html
+# Test files that are really json not js, and don't need to be linted.
+browser/components/sessionstore/test/unit/data/sessionstore_valid.js
+browser/components/sessionstore/test/unit/data/sessionstore_invalid.js
+# This file is split into two in order to keep it as a valid json file
+# for documentation purposes (policies.json) but to be accessed by the
+# code as a .sys.mjs (schema.sys.mjs)
+browser/components/enterprisepolicies/schemas/schema.sys.mjs
+# generated or library files in pocket
+browser/components/pocket/content/panels/js/tmpl.js
+browser/components/pocket/content/panels/js/vendor.bundle.js
+browser/components/pocket/content/panels/js/main.bundle.js
+# Include the Storybook config files.
+!browser/components/storybook/.storybook/
+!browser/components/storybook/.storybook/*.js
+
+# Ignore newtab files
+browser/components/newtab/data/
+browser/components/newtab/logs/
+
+# Ignore webpack about:welcome files
+browser/components/aboutwelcome/webpack.aboutwelcome.config.js
+
+# The only file in browser/locales/ is pre-processed.
+browser/locales/
+# Generated data files
+browser/extensions/formautofill/phonenumberutils/PhoneNumberMetaData.jsm
+
+# Ignore devtools debugger files which aren't intended for linting, and also
+# aren't included in any .eslintignore or .prettierignore file.
+# See https://github.com/firefox-devtools/debugger/blob/master/package.json#L24
+devtools/client/debugger/bin/
+devtools/client/debugger/configs/
+devtools/client/debugger/dist/
+devtools/client/debugger/images/
+devtools/client/debugger/packages/
+devtools/client/debugger/test/mochitest/examples/
+devtools/client/debugger/index.html
+devtools/client/debugger/webpack.config.js
+
+# Ignore devtools preferences files
+devtools/client/preferences/
+
+# Ignore devtools generated code
+devtools/client/webconsole/test/node/fixtures/stubs/*.js
+!devtools/client/webconsole/test/node/fixtures/stubs/index.js
+devtools/client/shared/components/test/node/stubs/reps/*.js
+devtools/client/shared/source-map-loader/test/browser/fixtures/*.js
+
+# Ignore devtools files testing sourcemaps / code style
+devtools/client/framework/test/code_*
+devtools/client/inspector/markup/test/events_bundle.js
+devtools/client/netmonitor/test/xhr_bundle.js
+devtools/client/webconsole/test/browser/code_bundle_nosource.js
+devtools/client/webconsole/test/browser/code_bundle_invalidmap.js
+devtools/client/webconsole/test/browser/test-autocomplete-mapped.js
+devtools/client/webconsole/test/browser/test-autocomplete-mapped.src.js
+devtools/client/inspector/markup/test/shadowdom_open_debugger.min.js
+devtools/client/webconsole/test/browser/test-click-function-to-source*.js
+devtools/client/webconsole/test/browser/test-external-script-errors.js
+devtools/client/webconsole/test/browser/test-mangled-function.*
+devtools/client/webconsole/test/browser/test-message-categories-canvas-css.js
+devtools/client/webconsole/test/browser/test-message-categories-empty-getelementbyid.js
+devtools/client/webconsole/test/browser/test-sourcemap*.js
+devtools/server/tests/xpcshell/setBreakpoint*
+devtools/server/tests/xpcshell/sourcemapped.js
+
+# Ignore generated code from wasm-bindgen
+devtools/client/performance-new/shared/profiler_get_symbols.js
+
+# Testing syntax error
+devtools/client/aboutdebugging/test/browser/resources/bad-extensions/invalid-json/manifest.json
+devtools/client/jsonview/test/invalid_json.json
+devtools/client/webconsole/test/browser/test-syntaxerror-worklet.js
+
+# devtools specific format test file
+devtools/server/tests/xpcshell/xpcshell_debugging_script.js
+devtools/shared/webconsole/test/browser/data.json
+
+# Generated
+dom/canvas/test/webgl-conf/generated/
+
+# Intentionally invalid/not parsable
+dom/html/test/test_bug677658.html
+dom/svg/test/test_nonAnimStrings.xhtml
+dom/svg/test/test_SVG_namespace_ids.html
+
+# Strange encodings
+dom/base/test/file_bug687859-16.js
+dom/base/test/file_bug707142_bom.json
+dom/base/test/file_bug707142_utf-16.json
+dom/encoding/test/test_utf16_files.html
+dom/encoding/test/file_utf16_be_bom.js
+dom/encoding/test/file_utf16_le_bom.js
+
+# Service workers fixtures which require specific resource caching.
+dom/base/test/file_js_cache.js
+dom/serviceworkers/test/file_js_cache.js
+
+# Intentional broken files
+dom/base/test/file_js_cache_syntax_error.js
+dom/base/test/jsmodules/test_scriptNotParsedAsModule.html
+dom/base/test/jsmodules/test_syntaxError.html
+dom/base/test/jsmodules/test_syntaxErrorAsync.html
+dom/base/test/jsmodules/module_badSyntax.mjs
+dom/base/test/jsmodules/test_syntaxErrorInline.html
+dom/base/test/jsmodules/test_syntaxErrorInlineAsync.html
+dom/base/test/test_bug687859.html
+dom/media/webrtc/tests/mochitests/identity/idp-bad.js
+dom/security/test/general/file_nonscript.json
+dom/serviceworkers/test/file_js_cache_syntax_error.js
+dom/serviceworkers/test/parse_error_worker.js
+dom/tests/mochitest/bugs/test_bug531176.html
+dom/webauthn/tests/cbor.js
+dom/workers/test/importScripts_worker_imported3.js
+dom/workers/test/invalid.js
+dom/workers/test/threadErrors_worker1.js
+
+# Tests the module loader's path handling.
+# Dynamic imports contains non-optimal paths.
+dom/workers/test/xpcshell/data/base_uri_worker.js
+dom/workers/test/xpcshell/data/base_uri_module.mjs
+
+# Bug 1527075: This directory is linted in github repository
+intl/l10n/
+
+# Exclude everything but self-hosted JS
+js/examples/
+js/public/
+js/src/devtools/
+js/src/jit-test/
+js/src/tests/
+js/src/Y.js
+
+# Changes to XPConnect tests must be carefully audited.
+js/xpconnect/tests/mochitest/
+js/xpconnect/tests/unit/
+
+# Fuzzing code for testing only, targeting the JS shell
+js/src/fuzz-tests/
+
+# Template file
+mobile/android/docs/geckoview/assets/js/search-data.json
+
+# Uses `#filter substitution`
+mobile/android/app/geckoview-prefs.js
+
+# Not much JS to lint and non-standard at that
+mobile/android/installer/
+mobile/android/locales/
+
+# Pre-processed/pref files
+modules/libpref/greprefs.js
+modules/libpref/init/all.js
+modules/libpref/test/unit/*data/
+toolkit/components/backgroundtasks/defaults/backgroundtasks.js
+toolkit/components/backgroundtasks/defaults/backgroundtasks_browser.js
+
+# Only contains non-standard test files.
+python/
+
+# These are (mainly) imported code that we don't want to lint to make imports easier.
+remote/cdp/Protocol.sys.mjs
+remote/cdp/test/browser/chrome-remote-interface.js
+remote/marionette/atom.sys.mjs
+
+# This file explicitly has a syntax error and cannot be parsed by eslint.
+remote/shared/messagehandler/test/browser/resources/modules/root/invalid.sys.mjs
+
+# services/ exclusions
+
+# Third party services
+services/common/kinto-http-client.sys.mjs
+services/common/kinto-offline-client.js
+
+# Webpack-bundled library
+services/fxaccounts/FxAccountsPairingChannel.sys.mjs
+
+# Servo is imported.
+servo/
+
+# Test files that we don't want to lint (preprocessed, minified etc)
+testing/condprofile/condprof/tests/profile
+testing/mozbase/mozprofile/tests/files/prefs_with_comments.js
+testing/mozharness/configs/test/test_malformed.json
+testing/talos/talos/startup_test/sessionrestore/profile/sessionstore.js
+testing/talos/talos/startup_test/sessionrestore/profile-manywindows/sessionstore.js
+# Python json.
+testing/talos/talos/unittests/test_talosconfig_browser_config.json
+testing/talos/talos/unittests/test_talosconfig_test_config.json
+# Runing Talos may extract data here, see bug 1435677.
+testing/talos/talos/tests/tp5n/
+testing/talos/talos/fis/tp5n/
+
+# Mainly third-party related code, that shouldn't be linted.
+testing/web-platform/
+
+# toolkit/ exclusions
+
+# Intentionally invalid files
+toolkit/components/workerloader/tests/moduleF-syntax-error.js
+toolkit/components/enterprisepolicies/tests/browser/config_broken_json.json
+toolkit/mozapps/extensions/test/xpcshell/data/test_AddonRepository_fail.json
+
+# Built files
+toolkit/components/pdfjs/content/build
+toolkit/components/pdfjs/content/web
+
+# Uses preprocessing
+toolkit/components/reader/Readerable.sys.mjs
+
+# Generated & special files in cld2
+toolkit/components/translation/cld2/
+
+# Uses preprocessing
+toolkit/mozapps/update/tests/data/xpcshellConstantsPP.js
+toolkit/modules/AppConstants.sys.mjs
+
+# Tests of ESLint command.
+tools/lint/test/files
+
+# Uses special template formatting.
+tools/tryselect/selectors/chooser/templates/chooser.html
+
+# Ignore preprocessed *(P)refs.js files in update-packaging.
+tools/update-packaging/**/*refs.js
+
+# Ignore pre-generated webpack and typescript transpiled files for translations
+browser/extensions/translations/extension/
+
+# "scaffolding" used by uniffi which isn't valid JS in its original form.
+toolkit/components/uniffi-bindgen-gecko-js/src/templates/js/
+toolkit/components/uniffi-bindgen-gecko-js/components/generated/*