Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

93 files changed, 10139 insertions, 0 deletions

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..596815c850
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/browser-test.js
@@ -0,0 +1,64 @@
+// 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,
+    PromiseDebugging: false,
+    SpecialPowers: false,
+    TestUtils: false,
+    XPCNativeWrapper: false,
+    addLoadEvent: 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,
+    todo: false,
+    todo_is: false,
+    todo_isnot: false,
+    waitForClipboard: false,
+    waitForExplicitFinish: false,
+    waitForFocus: false,
+  },
+
+  plugins: ["mozilla"],
+
+  rules: {
+    "mozilla/import-content-task-globals": "error",
+    "mozilla/import-headjs-globals": "error",
+    "mozilla/mark-test-function-used": "error",
+    "mozilla/no-arbitrary-setTimeout": "error",
+  },
+};
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..d097f8ebdf
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/chrome-test.js
@@ -0,0 +1,40 @@
+// 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"],
+
+  rules: {
+    "mozilla/import-content-task-globals": "error",
+    "mozilla/import-headjs-globals": "error",
+    "mozilla/mark-test-function-used": "error",
+  },
+};
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..af71955a4b
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/mochitest-test.js
@@ -0,0 +1,39 @@
+// 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,
+    XPCNativeWrapper: 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"],
+
+  rules: {
+    "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",
+    "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..72023fd0b9
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js
@@ -0,0 +1,305 @@
+/* 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,
+  },
+
+  extends: ["eslint:recommended", "plugin:prettier/recommended"],
+
+  globals: {
+    Cc: false,
+    // Specific to Firefox (Chrome code only).
+    ChromeUtils: false,
+    Ci: false,
+    Components: false,
+    Cr: false,
+    Cu: false,
+    Debugger: false,
+    InstallTrigger: false,
+    // Specific to Firefox
+    // https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/InternalError
+    InternalError: true,
+    Intl: false,
+    SharedArrayBuffer: false,
+    StopIteration: false,
+    dump: true,
+    // Override the "browser" env definition of "location" to allow writing as it
+    // is a writeable property.
+    // See https://bugzilla.mozilla.org/show_bug.cgi?id=1509270#c1 for more information.
+    location: true,
+    openDialog: false,
+    saveStack: false,
+    sizeToContent: false,
+    // Specific to Firefox
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/uneval
+    uneval: false,
+  },
+
+  overrides: [
+    {
+      // We don't have the general browser environment for jsm files, but we do
+      // have our own special environments for them.
+      env: {
+        browser: false,
+        "mozilla/jsm": true,
+      },
+      files: ["**/*.jsm", "**/*.jsm.js"],
+      rules: {
+        "mozilla/mark-exported-symbols-as-used": "error",
+        // TODO: Bug 1575506 turn `builtinGlobals` on here.
+        // We can enable builtinGlobals for jsms due to their scopes.
+        "no-redeclare": ["error", { builtinGlobals: false }],
+        // JSM 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",
+          },
+        ],
+      },
+    },
+  ],
+
+  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: {
+    // 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-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-chromeutils-import-null": "error",
+    "mozilla/reject-importGlobalProperties": ["error", "allownonwebidl"],
+    "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-ownerGlobal": "error",
+    "mozilla/use-returnValue": "error",
+    "mozilla/use-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",
+
+    // 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",
+
+    // 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 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/xpcshell-test.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/xpcshell-test.js
new file mode 100644
index 0000000000..4cff7fcdc3
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/xpcshell-test.js
@@ -0,0 +1,35 @@
+// Parent config file for all xpcshell files.
+"use strict";
+
+module.exports = {
+  env: {
+    "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",
+          },
+        ],
+      },
+    },
+  ],
+
+  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..76e03f2d49
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/browser-window.js
@@ -0,0 +1,108 @@
+/**
+ * @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/places/content/editBookmark.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 },
+];
+
+// 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",
+  "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/", "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-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..5f3cb199af
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/frame-script.js
@@ -0,0 +1,43 @@
+/**
+ * @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: {
+    addMessageListener: false,
+    addWeakMessageListener: false,
+    atob: false,
+    btoa: false,
+    chromeOuterWindowID: false,
+    content: false,
+    docShell: false,
+    processMessageManager: false,
+    removeMessageListener: false,
+    removeWeakMessageListener: false,
+    sendAsyncMessage: false,
+    sendSyncMessage: false,
+    tabEventTarget: false,
+    RPMGetAppBuildID: false,
+    RPMGetInnerMostURI: false,
+    RPMGetIntPref: false,
+    RPMGetStringPref: false,
+    RPMGetBoolPref: false,
+    RPMSetBoolPref: false,
+    RPMPrefIsLocked: false,
+    RPMGetFormatURLPref: false,
+    RPMIsWindowPrivate: false,
+    RPMSendAsyncMessage: false,
+    RPMSendQuery: false,
+    RPMAddMessageListener: false,
+    RPMRecordTelemetryEvent: false,
+    RPMAddToHistogram: false,
+    RPMRemoveMessageListener: false,
+    RPMGetHttpResponseHeader: 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..858494b8d4
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/jsm.js
@@ -0,0 +1,24 @@
+/**
+ * @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/ed212c79cfe86357e9a5740082b9364e7f6e526f/js/xpconnect/loader/mozJSComponentLoader.cpp#134-140
+    atob: false,
+    btoa: false,
+    debug: 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,
+  },
+};
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..12d9e0096d
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/privileged.js
@@ -0,0 +1,776 @@
+/**
+ * @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: {
+    // 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,
+    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,
+    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,
+    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,
+    FrameLoader: false,
+    GainNode: false,
+    Gamepad: false,
+    GamepadAxisMoveEvent: false,
+    GamepadButton: false,
+    GamepadButtonEvent: false,
+    GamepadEvent: false,
+    GamepadHapticActuator: false,
+    GamepadPose: false,
+    GamepadServiceTest: 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,
+    HiddenPluginEvent: 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,
+    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,
+    PlacesBookmarkRemoved: false,
+    PlacesEvent: false,
+    PlacesHistoryCleared: false,
+    PlacesObservers: false,
+    PlacesRanking: false,
+    PlacesVisit: 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,
+    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,
+    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,
+    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,
+    mozRTCIceCandidate: false,
+    mozRTCPeerConnection: false,
+    mozRTCSessionDescription: 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/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..570119b6e9
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/xpcshell.js
@@ -0,0 +1,43 @@
+/**
+ * @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";
+
+var { getScriptGlobals } = require("./utils");
+
+const extraGlobals = [
+  // Assert.jsm globals.
+  "setReporter",
+  "report",
+  "ok",
+  "equal",
+  "notEqual",
+  "deepEqual",
+  "notDeepEqual",
+  "strictEqual",
+  "notStrictEqual",
+  "throws",
+  "rejects",
+  "greater",
+  "greaterOrEqual",
+  "less",
+  "lessOrEqual",
+  // TestingFunctions.cpp globals
+  "allocationMarker",
+  "byteSize",
+  "gc",
+  "gczeal",
+];
+
+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..cb1b0d5f66
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/globals.js
@@ -0,0 +1,359 @@
+/**
+ * @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");
+
+/**
+ * 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 xul 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 = {};
+
+/**
+ * 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) {
+  this.path = filePath;
+  this.dirname = path.dirname(this.path);
+}
+
+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;
+      }
+
+      let filePath = match[1].trim();
+
+      if (!path.isAbsolute(filePath)) {
+        filePath = path.resolve(this.dirname, filePath);
+      }
+      globals = globals.concat(module.exports.getGlobalsForFile(filePath));
+    }
+
+    return globals;
+  },
+
+  ExpressionStatement(node, parents, globalScope) {
+    let isGlobal = helpers.getIsGlobalScope(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 = helpers.convertThisAssignmentExpressionToGlobals(
+        node,
+        isGlobal
+      );
+    } else if (node.expression.type === "CallExpression") {
+      globals = helpers.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 (globalScope && globalScope.set.get("importScripts")) {
+      let workerDetails = helpers.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 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;
+      }
+      let scriptName;
+      if (script.src.includes("http:")) {
+        // We don't handle this currently as the paths are complex to match.
+      } else if (script.src.includes("chrome")) {
+        // This is one way of referencing test files.
+        script.src = script.src.replace("chrome://mochikit/content/", "/");
+        scriptName = path.join(
+          helpers.rootDir,
+          "testing",
+          "mochitest",
+          script.src
+        );
+      } else if (script.src.includes("SimpleTest")) {
+        // This is another way of referencing test files...
+        scriptName = path.join(
+          helpers.rootDir,
+          "testing",
+          "mochitest",
+          script.src
+        );
+      } else if (script.src.startsWith("/tests/")) {
+        scriptName = path.join(helpers.rootDir, script.src.substring(7));
+      } else {
+        // Fallback to hoping this is a relative path.
+        scriptName = path.join(dir, script.src);
+      }
+      if (scriptName && fs.existsSync(scriptName)) {
+        globals.push(
+          ...module.exports.getGlobalsForFile(scriptName, {
+            ecmaVersion: helpers.getECMAVersion(),
+            sourceType: script.type,
+          })
+        );
+      }
+    }
+
+    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..a3a5fcf8e7
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/helpers.js
@@ -0,0 +1,881 @@
+/**
+ * @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");
+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 gModules = null;
+var gRootDir = null;
+var directoryManifests = new Map();
+
+const callExpressionDefinitions = [
+  /^loader\.lazyGetter\(this, "(\w+)"/,
+  /^loader\.lazyImporter\(this, "(\w+)"/,
+  /^loader\.lazyServiceGetter\(this, "(\w+)"/,
+  /^loader\.lazyRequireGetter\(this, "(\w+)"/,
+  /^XPCOMUtils\.defineLazyGetter\(this, "(\w+)"/,
+  /^XPCOMUtils\.defineLazyModuleGetter\(this, "(\w+)"/,
+  /^ChromeUtils\.defineModuleGetter\(this, "(\w+)"/,
+  /^XPCOMUtils\.defineLazyPreferenceGetter\(this, "(\w+)"/,
+  /^XPCOMUtils\.defineLazyProxy\(this, "(\w+)"/,
+  /^XPCOMUtils\.defineLazyScriptGetter\(this, "(\w+)"/,
+  /^XPCOMUtils\.defineLazyServiceGetter\(this, "(\w+)"/,
+  /^XPCOMUtils\.defineConstant\(this, "(\w+)"/,
+  /^DevToolsUtils\.defineLazyModuleGetter\(this, "(\w+)"/,
+  /^DevToolsUtils\.defineLazyGetter\(this, "(\w+)"/,
+  /^Object\.defineProperty\(this, "(\w+)"/,
+  /^Reflect\.defineProperty\(this, "(\w+)"/,
+  /^this\.__defineGetter__\("(\w+)"/,
+];
+
+const callExpressionMultiDefinitions = [
+  "XPCOMUtils.defineLazyGlobalGetters(this,",
+  "XPCOMUtils.defineLazyModuleGetters(this,",
+  "XPCOMUtils.defineLazyServiceGetters(this,",
+  "loader.lazyRequireGetter(this,",
+];
+
+const imports = [
+  /^(?:Cu|Components\.utils|ChromeUtils)\.import\(".*\/((.*?)\.jsm?)", this\)/,
+];
+
+const workerImportFilenameMatch = /(.*\/)*((.*?)\.jsm?)/;
+
+module.exports = {
+  get iniParser() {
+    if (!this._iniParser) {
+      this._iniParser = new ini.Parser();
+    }
+    return this._iniParser;
+  },
+
+  get modulesGlobalData() {
+    if (!gModules) {
+      if (this.isMozillaCentralBased()) {
+        gModules = require(path.join(
+          this.rootDir,
+          "tools",
+          "lint",
+          "eslint",
+          "modules.json"
+        ));
+      } else {
+        gModules = require("./modules.json");
+      }
+    }
+
+    return gModules;
+  },
+
+  get servicesData() {
+    return require("./services.json");
+  },
+
+  /**
+   * 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().
+   *
+   * @return {Object}
+   *         Returns an object containing `ast`, `scopeManager` and
+   *         `visitorKeys`
+   */
+  parseCode(sourceText, astOptions = {}) {
+    // Use a permissive config file to allow parsing of anything that Espree
+    // can parse.
+    let config = { ...this.getPermissiveConfig(), ...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)
+        );
+      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 == 0) {
+          throw new Error("Left more nodes than entered.");
+        }
+        parents.pop();
+      },
+
+      keys: visitorKeys,
+    });
+    if (parents.length) {
+      throw new Error("Entered more nodes than left.");
+    }
+  },
+
+  /**
+   * 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.
+   */
+  convertWorkerExpressionToGlobals(node, isGlobal, dirname) {
+    var getGlobalsForFile = require("./globals").getGlobalsForFile;
+
+    let globalModules = this.modulesGlobalData;
+
+    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 = getGlobalsForFile(filePath);
+              results = results.concat(additionalGlobals);
+            }
+          } else if (match[2] in globalModules) {
+            results = results.concat(
+              globalModules[match[2]].map(name => {
+                return { name, writable: true };
+              })
+            );
+          } else {
+            results.push({ name: match[3], writable: true, explicit: true });
+          }
+        }
+      }
+    }
+
+    return results;
+  },
+
+  /**
+   * 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.
+   */
+  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 CallExpressions that look like module imports
+   * into global variable definitions, using modules.json data if appropriate.
+   *
+   * @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.
+   */
+  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 = this.getASTSource(node);
+    } catch (e) {
+      return [];
+    }
+
+    for (let reg of imports) {
+      let match = source.match(reg);
+      if (match) {
+        // The two argument form is only acceptable in the global scope
+        if (node.expression.arguments.length > 1 && !isGlobal) {
+          return [];
+        }
+
+        let globalModules = this.modulesGlobalData;
+
+        if (match[1] in globalModules) {
+          // XXX We mark as explicit when there is only one exported symbol from
+          // the module. For now this avoids no-unused-vars complaining in the
+          // cases where we import everything from a module but only use one
+          // of them.
+          let explicit = globalModules[match[1]].length == 1;
+          return globalModules[match[1]].map(name => ({
+            name,
+            writable: true,
+            explicit,
+          }));
+        }
+
+        return [{ name: match[2], writable: true, explicit: true }];
+      }
+    }
+
+    // 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 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 [];
+  },
+
+  /**
+   * 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({ node, name: { name } });
+      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.
+   *
+   * @return {Object}
+   *         Espree compatible permissive config.
+   */
+  getPermissiveConfig() {
+    return {
+      range: true,
+      loc: true,
+      comment: true,
+      attachComment: true,
+      ecmaVersion: this.getECMAVersion(),
+      sourceType: "script",
+    };
+  },
+
+  /**
+   * Returns the ECMA version of the recommended config.
+   *
+   * @return {Number} The ECMA version of the recommended config.
+   */
+  getECMAVersion() {
+    return recommendedConfig.parserOptions.ecmaVersion;
+  },
+
+  /**
+   * Check whether a node is a function.
+   *
+   * @param {Object} node
+   *        The AST node to check
+   *
+   * @return {Boolean}
+   *         True or false
+   */
+  getIsFunctionNode(node) {
+    switch (node.type) {
+      case "ArrowFunctionExpression":
+      case "FunctionDeclaration":
+      case "FunctionExpression":
+        return true;
+    }
+    return false;
+  },
+
+  /**
+   * Check whether the context is the global scope.
+   *
+   * @param {Array} ancestors
+   *        The parents of the current node.
+   *
+   * @return {Boolean}
+   *         True or false
+   */
+  getIsGlobalScope(ancestors) {
+    for (let parent of ancestors) {
+      if (this.getIsFunctionNode(parent)) {
+        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);
+  },
+
+  /**
+   * 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.callee.property.name == "lazyImporter") &&
+      node.arguments.length >= 3 &&
+      node.arguments[2].type == "Literal"
+    ) {
+      return node.arguments[2].value;
+    }
+    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..c05cb9a089
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/index.js
@@ -0,0 +1,72 @@
+/**
+ * @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"),
+    "xpcshell-test": require("../lib/configs/xpcshell-test"),
+  },
+  environments: {
+    "browser-window": require("../lib/environments/browser-window.js"),
+    "chrome-worker": require("../lib/environments/chrome-worker.js"),
+    "frame-script": require("../lib/environments/frame-script.js"),
+    jsm: require("../lib/environments/jsm.js"),
+    simpletest: require("../lib/environments/simpletest.js"),
+    privileged: require("../lib/environments/privileged.js"),
+    xpcshell: require("../lib/environments/xpcshell.js"),
+  },
+  processors: {
+    ".xul": require("../lib/processors/xul"),
+  },
+  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"),
+    "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-arbitrary-setTimeout": require("../lib/rules/no-arbitrary-setTimeout"),
+    "no-compare-against-boolean-literals": require("../lib/rules/no-compare-against-boolean-literals"),
+    "no-define-cc-etc": require("../lib/rules/no-define-cc-etc"),
+    "no-task": require("../lib/rules/no-task"),
+    "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-chromeutils-import-null": require("../lib/rules/reject-chromeutils-import-null"),
+    "reject-importGlobalProperties": require("../lib/rules/reject-importGlobalProperties"),
+    "reject-relative-requires": require("../lib/rules/reject-relative-requires"),
+    "reject-some-requires": require("../lib/rules/reject-some-requires"),
+    "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-returnValue": require("../lib/rules/use-returnValue"),
+    "use-services": require("../lib/rules/use-services"),
+    "var-only-at-top-level": require("../lib/rules/var-only-at-top-level"),
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/processors/processor-helpers.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/processors/processor-helpers.js
new file mode 100644
index 0000000000..0f56debe1b
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/processors/processor-helpers.js
@@ -0,0 +1,120 @@
+/* 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";
+
+let sax = require("sax");
+
+// Converts sax's error message to something that eslint will understand
+let errorRegex = /(.*)\nLine: (\d+)\nColumn: (\d+)\nChar: (.*)/;
+function parseError(err) {
+  let matches = err.message.match(errorRegex);
+  if (!matches) {
+    return null;
+  }
+
+  return {
+    fatal: true,
+    message: matches[1],
+    line: parseInt(matches[2]) + 1,
+    column: parseInt(matches[3]),
+  };
+}
+
+let entityRegex = /&[\w][\w-\.]*;/g;
+
+// A simple sax listener that generates a tree of element information
+function XMLParser(text) {
+  // Non-strict allows us to ignore many errors from entities and
+  // preprocessing at the expense of failing to report some XML errors.
+  // Unfortunately it also throws away the case of tagnames and attributes
+  let parser = sax.parser(false, {
+    lowercase: true,
+    xmlns: true,
+  });
+
+  parser.onerror = function(err) {
+    this.lastError = parseError(err);
+  };
+
+  this.parser = parser;
+  parser.onopentag = this.onOpenTag.bind(this);
+  parser.onclosetag = this.onCloseTag.bind(this);
+  parser.ontext = this.onText.bind(this);
+  parser.onopencdata = this.onOpenCDATA.bind(this);
+  parser.oncdata = this.onCDATA.bind(this);
+  parser.oncomment = this.onComment.bind(this);
+
+  this.document = {
+    local: "#document",
+    uri: null,
+    children: [],
+    comments: [],
+  };
+  this._currentNode = this.document;
+
+  parser.write(text);
+}
+
+XMLParser.prototype = {
+  parser: null,
+
+  lastError: null,
+
+  onOpenTag(tag) {
+    let node = {
+      parentNode: this._currentNode,
+      local: tag.local,
+      namespace: tag.uri,
+      attributes: {},
+      children: [],
+      comments: [],
+      textContent: "",
+      textLine: this.parser.line,
+      textColumn: this.parser.column,
+      textEndLine: this.parser.line,
+    };
+
+    for (let attr of Object.keys(tag.attributes)) {
+      if (tag.attributes[attr].uri == "") {
+        node.attributes[attr] = tag.attributes[attr].value;
+      }
+    }
+
+    this._currentNode.children.push(node);
+    this._currentNode = node;
+  },
+
+  onCloseTag(tagname) {
+    this._currentNode.textEndLine = this.parser.line;
+    this._currentNode = this._currentNode.parentNode;
+  },
+
+  addText(text) {
+    this._currentNode.textContent += text;
+  },
+
+  onText(text) {
+    // Replace entities with some valid JS token.
+    this.addText(text.replace(entityRegex, "null"));
+  },
+
+  onOpenCDATA() {
+    // Turn the CDATA opening tag into whitespace for indent alignment
+    this.addText(" ".repeat("<![CDATA[".length));
+  },
+
+  onCDATA(text) {
+    this.addText(text);
+  },
+
+  onComment(text) {
+    this._currentNode.comments.push(text);
+  },
+};
+
+module.exports = {
+  XMLParser,
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/processors/xul.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/processors/xul.js
new file mode 100644
index 0000000000..c486b38e06
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/processors/xul.js
@@ -0,0 +1,262 @@
+/**
+ * @fileoverview Converts inline attributes from XUL into JS
+ * 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";
+
+let path = require("path");
+let fs = require("fs");
+
+let XMLParser = require("./processor-helpers").XMLParser;
+
+// Stores any XML parse error
+let xmlParseError = null;
+
+// Stores the lines of JS code generated from the XUL.
+let scriptLines = [];
+// Stores a map from the synthetic line number to the real line number
+// and column offset.
+let lineMap = [];
+
+let includedRanges = [];
+
+// Deal with ifdefs. This is the state we pretend to have:
+const kIfdefStateForLinting = {
+  MOZ_UPDATER: true,
+  XP_WIN: true,
+  MOZ_BUILD_APP_IS_BROWSER: true,
+  MOZ_SERVICES_SYNC: true,
+  MOZ_DATA_REPORTING: true,
+  MOZ_TELEMETRY_REPORTING: true,
+  MOZ_CRASHREPORTER: true,
+  MOZ_NORMANDY: true,
+  MOZ_MAINTENANCE_SERVICE: true,
+  HAVE_SHELL_SERVICE: true,
+  MENUBAR_CAN_AUTOHIDE: true,
+  MOZILLA_OFFICIAL: true,
+};
+
+// Anything not in the above list is assumed false.
+function dealWithIfdefs(text, filename) {
+  function stripIfdefsFromLines(input, innerFile) {
+    let outputLines = [];
+    let inSkippingIfdef = [false];
+    for (let i = 0; i < input.length; i++) {
+      let line = input[i];
+      let shouldSkip = inSkippingIfdef.some(x => x);
+      if (!line.startsWith("#")) {
+        outputLines.push(shouldSkip ? "" : line);
+      } else {
+        if (
+          line.startsWith("# ") ||
+          line.startsWith("#filter") ||
+          line == "#" ||
+          line.startsWith("#define")
+        ) {
+          outputLines.push("");
+          continue;
+        }
+        // if this isn't just a comment (which we skip), figure out what to do:
+        let term = "";
+        let negate = false;
+        if (line.startsWith("#ifdef")) {
+          term = line.match(/^#ifdef *([A-Z_]+)/);
+        } else if (line.startsWith("#ifndef")) {
+          term = line.match(/^#ifndef *([A-Z_]+)/);
+          negate = true;
+        } else if (line.startsWith("#if ")) {
+          term = line.match(/^defined\(([A-Z_]+)\)/);
+        } else if (line.startsWith("#elifdef")) {
+          // Replace the old one:
+          inSkippingIfdef.pop();
+          term = line.match(/^#elifdef *([A-Z_]+)/);
+        } else if (line.startsWith("#else")) {
+          // Switch the last one around:
+          let old = inSkippingIfdef.pop();
+          inSkippingIfdef.push(!old);
+          outputLines.push("");
+        } else if (line.startsWith("#endif")) {
+          inSkippingIfdef.pop();
+          outputLines.push("");
+        } else if (line.startsWith("#expand")) {
+          // Just strip expansion instructions
+          outputLines.push(line.substring("#expand ".length));
+        } else if (line.startsWith("#include")) {
+          // Uh oh.
+          if (!shouldSkip) {
+            let fileToInclude = line.substr("#include ".length).trim();
+            let subpath = path.join(path.dirname(innerFile), fileToInclude);
+            let contents = fs.readFileSync(subpath, { encoding: "utf-8" });
+            contents = contents.split(/\n/);
+            // Recurse:
+            contents = stripIfdefsFromLines(contents, subpath);
+            if (innerFile == filename) {
+              includedRanges.push({
+                start: i,
+                end: i + contents.length,
+                filename: subpath,
+              });
+            }
+            // And insert the resulting lines:
+            input = input.slice(0, i).concat(contents, input.slice(i + 1));
+            // Re-process this line now that we've spliced things in.
+            i--;
+          } else {
+            outputLines.push("");
+          }
+        } else {
+          throw new Error("Unknown preprocessor directive: " + line);
+        }
+
+        if (term) {
+          // We always want the first capturing subgroup:
+          term = term && term[1];
+          if (!negate) {
+            inSkippingIfdef.push(!kIfdefStateForLinting[term]);
+          } else {
+            inSkippingIfdef.push(kIfdefStateForLinting[term]);
+          }
+          outputLines.push("");
+          // Now just continue; we'll include lines depending on the state of `inSkippingIfdef`.
+        }
+      }
+    }
+    return outputLines;
+  }
+  let lines = text.split(/\n/);
+  return stripIfdefsFromLines(lines, filename).join("\n");
+}
+
+function addSyntheticLine(line, linePos, addDisableLine) {
+  lineMap[scriptLines.length] = { line: linePos };
+  scriptLines.push(line + (addDisableLine ? "" : " // eslint-disable-line"));
+}
+
+function recursiveExpand(node) {
+  for (let [attr, value] of Object.entries(node.attributes)) {
+    if (attr.startsWith("on")) {
+      if (attr == "oncommand" && value == ";") {
+        // Ignore these, see bug 371900 for why people might do this.
+        continue;
+      }
+      // Ignore dashes in the tag name
+      let nodeDesc = node.local.replace(/-/g, "");
+      if (node.attributes.id) {
+        nodeDesc += "_" + node.attributes.id.replace(/[^a-z]/gi, "_");
+      }
+      if (node.attributes.class) {
+        nodeDesc += "_" + node.attributes.class.replace(/[^a-z]/gi, "_");
+      }
+      addSyntheticLine("function " + nodeDesc + "(event) {", node.textLine);
+      let processedLines = value.split(/\r?\n/);
+      let addlLine = 0;
+      for (let line of processedLines) {
+        line = line.replace(/^\s*/, "");
+        lineMap[scriptLines.length] = {
+          // Unfortunately, we only get a line number for the <tag> finishing,
+          // not for individual attributes.
+          line: node.textLine + addlLine,
+        };
+        scriptLines.push(line);
+        addlLine++;
+      }
+      addSyntheticLine("}", node.textLine + processedLines.length - 1);
+    }
+  }
+  for (let kid of node.children) {
+    recursiveExpand(kid);
+  }
+}
+
+module.exports = {
+  preprocess(text, filename) {
+    if (filename.includes(".inc")) {
+      return [];
+    }
+    xmlParseError = null;
+    // The following rules are annoying in XUL.
+    // Indent because in multiline attributes it's impossible to understand for the XML parser.
+    // Semicolons because those shouldn't be required for inline event handlers.
+    // Quotes because we use doublequotes for attributes so using single quotes
+    // for strings inside them makes sense.
+    // No-undef because it's a bunch of work to teach this code how to read
+    // scripts and get globals from them (though ideally we should do that at some point).
+    scriptLines = [
+      "/* eslint-disable indent */",
+      "/* eslint-disable indent-legacy */",
+      "/* eslint-disable semi */",
+      "/* eslint-disable quotes */",
+      "/* eslint-disable no-undef */",
+    ];
+    lineMap = scriptLines.map(() => ({ line: 0 }));
+    includedRanges = [];
+    // Do C-style preprocessing first:
+    text = dealWithIfdefs(text, filename);
+
+    let xp = new XMLParser(text);
+    if (xp.lastError) {
+      xmlParseError = xp.lastError;
+    }
+    let doc = xp.document;
+    if (!doc) {
+      return [];
+    }
+    let node = doc;
+    for (let kid of node.children) {
+      recursiveExpand(kid);
+    }
+
+    let scriptText = scriptLines.join("\n") + "\n";
+    return [scriptText];
+  },
+
+  postprocess(messages, filename) {
+    // If there was an XML parse error then just return that
+    if (xmlParseError) {
+      return [xmlParseError];
+    }
+
+    // For every message from every script block update the line to point to the
+    // correct place.
+    let errors = [];
+    for (let i = 0; i < messages.length; i++) {
+      for (let message of messages[i]) {
+        // ESLint indexes lines starting at 1 but our arrays start at 0
+        let mapped = lineMap[message.line - 1];
+        // Ensure we don't modify this by making a copy. We might need it for another failure.
+        let target = mapped.line;
+        let includedRange = includedRanges.find(
+          r => target >= r.start && target <= r.end
+        );
+        // If this came from an #included file, indicate this in the message
+        if (includedRange) {
+          target = includedRange.start;
+          message.message +=
+            " (from included file " +
+            path.basename(includedRange.filename) +
+            ")";
+        }
+        // Compensate for line numbers shifting as a result of #include:
+        let includeBallooning = includedRanges
+          .filter(r => target >= r.end)
+          .map(r => r.end - r.start)
+          .reduce((acc, next) => acc + next, 0);
+        target -= includeBallooning;
+        // Add back the 1 to go back to 1-indexing.
+        message.line = target + 1;
+
+        // We never have column information, unfortunately.
+        message.column = NaN;
+
+        errors.push(message);
+      }
+    }
+
+    return errors;
+  },
+};
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..4f06390189
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/avoid-Date-timing.js
@@ -0,0 +1,67 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    docs: {
+      description: "disallow use of Date for timing measurements",
+      category: "Best Practices",
+    },
+    schema: [],
+  },
+
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  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,
+          "use performance.now() instead of Date.now() for timing " +
+            "measurements"
+        );
+      },
+
+      NewExpression(node) {
+        let callee = node.callee;
+        if (
+          callee.type !== "Identifier" ||
+          callee.name !== "Date" ||
+          node.arguments.length > 0
+        ) {
+          return;
+        }
+
+        context.report(
+          node,
+          "use performance.now() instead of new Date() for timing " +
+            "measurements"
+        );
+      },
+    };
+  },
+};
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..99d0ff5027
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/avoid-removeChild.js
@@ -0,0 +1,64 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+var helpers = require("../helpers");
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  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,
+          "use element.remove() instead of " +
+            "element.parentNode.removeChild(element)"
+        );
+      }
+
+      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,
+          "use element.firstChild.remove() instead of " +
+            "element.removeChild(element.firstChild)"
+        );
+      }
+    },
+  };
+};
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..b6fb25139a
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/balanced-listeners.js
@@ -0,0 +1,147 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Helpers
+  // ---------------------------------------------------------------------------
+
+  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;
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public
+  // ---------------------------------------------------------------------------
+
+  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(
+          listener.node,
+          "No corresponding '{{functionName}}({{type}})' was found.",
+          {
+            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..f714b31cda
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/balanced-observers.js
@@ -0,0 +1,119 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Helpers
+  // ---------------------------------------------------------------------------
+
+  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
+    );
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public
+  // ---------------------------------------------------------------------------
+
+  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(
+          observer.node,
+          "No corresponding 'removeObserver(\"{{observable}}\")' was found.",
+          {
+            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..af51dcea1f
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/consistent-if-bracing.js
@@ -0,0 +1,49 @@
+/**
+ * @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: {
+    messages: {
+      consistentIfBracing: "Bracing of if..else bodies should be consistent.",
+    },
+  },
+
+  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..bcbdb3ec54
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-browser-window-globals.js
@@ -0,0 +1,49 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+var path = require("path");
+var helpers = require("../helpers");
+var browserWindowEnv = require("../environments/browser-window");
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  // ---------------------------------------------------------------------------
+
+  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 &&
+        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..b8545b45f8
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-content-task-globals.js
@@ -0,0 +1,84 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+var helpers = require("../helpers");
+var frameScriptEnv = require("../environments/frame-script");
+
+// The global environment of SpecialPowers.spawn tasks is
+// controlled by the Sandbox environment created by
+// SpecialPowersSandbox.jsm. This list should be kept in sync with
+// that module.
+var sandboxGlobals = [
+  "Assert",
+  "Blob",
+  "BrowsingContext",
+  "ChromeUtils",
+  "ContentTaskUtils",
+  "EventUtils",
+  "Services",
+  "TextDecoder",
+  "TextEncoder",
+  "URL",
+  "assert",
+  "info",
+  "is",
+  "isnot",
+  "ok",
+  "todo",
+  "todo_is",
+];
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  // ---------------------------------------------------------------------------
+
+  return {
+    "CallExpression[callee.object.name='ContentTask'][callee.property.name='spawn']": function(
+      node
+    ) {
+      for (let global in frameScriptEnv.globals) {
+        helpers.addVarToScope(
+          global,
+          context.getScope(),
+          frameScriptEnv.globals[global]
+        );
+      }
+    },
+    "CallExpression[callee.object.name='SpecialPowers'][callee.property.name='spawn']": function(
+      node
+    ) {
+      let globals = [...sandboxGlobals, "SpecialPowers", "content", "docShell"];
+      for (let global of globals) {
+        helpers.addVarToScope(global, context.getScope(), false);
+      }
+    },
+    "CallExpression[callee.object.name='SpecialPowers'][callee.property.name='spawnChrome']": function(
+      node
+    ) {
+      let globals = [
+        ...sandboxGlobals,
+        "browsingContext",
+        "windowGlobalParent",
+      ];
+      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..053a9e702f
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-globals.js
@@ -0,0 +1,15 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = 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..cffd7a4c8e
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/import-headjs-globals.js
@@ -0,0 +1,47 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+var fs = require("fs");
+var helpers = require("../helpers");
+var globals = require("../globals");
+
+module.exports = function(context) {
+  function importHead(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());
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public
+  // ---------------------------------------------------------------------------
+
+  return {
+    Program(node) {
+      let heads = helpers.getTestHeadFiles(context);
+      for (let head of heads) {
+        importHead(head, node);
+      }
+    },
+  };
+};
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..c535a54a16
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/mark-exported-symbols-as-used.js
@@ -0,0 +1,83 @@
+/**
+ * @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,
+      message: "Unexpected assignment of non-Array to EXPORTED_SYMBOLS",
+    });
+    return;
+  }
+
+  for (let element of expression.elements) {
+    context.markVariableAsUsed(element.value);
+  }
+  // Also mark EXPORTED_SYMBOLS as used.
+  context.markVariableAsUsed("EXPORTED_SYMBOLS");
+}
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = function(context) {
+  // 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() {
+    return !context.getScope().upper;
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public
+  // ---------------------------------------------------------------------------
+
+  return {
+    AssignmentExpression(node, parents) {
+      if (
+        node.operator === "=" &&
+        node.left.type === "MemberExpression" &&
+        node.left.object.type === "ThisExpression" &&
+        node.left.property.name === "EXPORTED_SYMBOLS" &&
+        isGlobalScope()
+      ) {
+        markArrayElementsAsUsed(context, node, node.right);
+      }
+    },
+
+    VariableDeclaration(node, parents) {
+      if (!isGlobalScope()) {
+        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,
+              message:
+                "EXPORTED_SYMBOLS cannot be declared via `let`. Use `var` or `this.EXPORTED_SYMBOLS =`",
+            });
+          }
+
+          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..0c0dcfdbe5
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/mark-test-function-used.js
@@ -0,0 +1,37 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+var helpers = require("../helpers");
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  // ---------------------------------------------------------------------------
+
+  return {
+    Program() {
+      let testType = helpers.getTestType(context);
+      if (testType == "browser") {
+        context.markVariableAsUsed("test");
+        return;
+      }
+
+      if (testType == "xpcshell") {
+        context.markVariableAsUsed("run_test");
+      }
+    },
+  };
+};
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..af7fe06336
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-aArgs.js
@@ -0,0 +1,56 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Helpers
+  // ---------------------------------------------------------------------------
+
+  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);
+  }
+
+  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(
+          param,
+          "Parameter '{{name}}' uses Hungarian Notation, " +
+            "consider using '{{suggestion}}' instead.",
+          errorObj
+        );
+      }
+    }
+  }
+
+  // ---------------------------------------------------------------------------
+  // Public
+  // ---------------------------------------------------------------------------
+
+  return {
+    FunctionDeclaration: checkFunction,
+    ArrowFunctionExpression: checkFunction,
+    FunctionExpression: checkFunction,
+  };
+};
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..be0b5c5ffb
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-arbitrary-setTimeout.js
@@ -0,0 +1,70 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+var helpers = require("../helpers");
+var testTypes = new Set(["browser", "xpcshell"]);
+
+module.exports = {
+  meta: {
+    docs: {
+      description: "disallow setTimeout with non-zero values in tests",
+      category: "Best Practices",
+    },
+    schema: [],
+  },
+
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        // 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;
+        }
+
+        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,
+            "listen for events instead of setTimeout() " +
+              "with arbitrary delay"
+          );
+        }
+      },
+    };
+  },
+};
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..bb48563fff
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-compare-against-boolean-literals.js
@@ -0,0 +1,34 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  return {
+    BinaryExpression(node) {
+      if (
+        ["==", "!="].includes(node.operator) &&
+        (["true", "false"].includes(node.left.raw) ||
+          ["true", "false"].includes(node.right.raw))
+      ) {
+        context.report(
+          node,
+          "Don't compare for inexact equality against boolean literals"
+        );
+      }
+    },
+  };
+};
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..0b441e4712
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-define-cc-etc.js
@@ -0,0 +1,49 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+const componentsBlacklist = ["Cc", "Ci", "Cr", "Cu"];
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  return {
+    VariableDeclarator(node) {
+      if (
+        node.id.type == "Identifier" &&
+        componentsBlacklist.includes(node.id.name)
+      ) {
+        context.report(
+          node,
+          `${node.id.name} is now defined in global scope, a separate definition is no longer necessary.`
+        );
+      }
+
+      if (node.id.type == "ObjectPattern") {
+        for (let property of node.id.properties) {
+          if (
+            property.type == "Property" &&
+            componentsBlacklist.includes(property.value.name)
+          ) {
+            context.report(
+              node,
+              `${property.value.name} is now defined in global scope, a separate definition is no longer necessary.`
+            );
+          }
+        }
+      }
+    },
+  };
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-task.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-task.js
new file mode 100644
index 0000000000..2bab6e8742
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-task.js
@@ -0,0 +1,33 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  return {
+    CallExpression(node) {
+      let callee = node.callee;
+      if (
+        callee.type === "MemberExpression" &&
+        callee.object.type === "Identifier" &&
+        callee.object.name === "Task"
+      ) {
+        context.report({ node, message: "Task.jsm is deprecated." });
+      }
+    },
+  };
+};
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..21f27ff130
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-throw-cr-literal.js
@@ -0,0 +1,100 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+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: {
+    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",
+    },
+  },
+
+  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..4fd0734465
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-parameters.js
@@ -0,0 +1,147 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    type: "suggestion",
+    fixable: "code",
+  },
+  create(context) {
+    function getRangeAfterArgToEnd(argNumber, args) {
+      let sourceCode = context.getSourceCode();
+      return [
+        sourceCode.getTokenAfter(args[argNumber]).range[0],
+        args[args.length - 1].range[1],
+      ];
+    }
+
+    // ---------------------------------------------------------------------------
+    // Public
+    //  --------------------------------------------------------------------------
+
+    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));
+            },
+            message: `${name}'s third parameter can be omitted when it's false.`,
+          });
+        }
+
+        if (name === "clearUserPref" && args.length > 1) {
+          context.report({
+            node,
+            fix: fixer => {
+              return fixer.removeRange(getRangeAfterArgToEnd(0, args));
+            },
+            message: `${name} takes only 1 parameter.`,
+          });
+        }
+
+        if (name === "removeObserver" && args.length === 3 && isBool(args[2])) {
+          context.report({
+            node,
+            fix: fixer => {
+              return fixer.removeRange(getRangeAfterArgToEnd(1, args));
+            },
+            message: "removeObserver only takes 2 parameters.",
+          });
+        }
+
+        if (name === "appendElement" && args.length === 2 && isFalse(args[1])) {
+          context.report({
+            node,
+            fix: fixer => {
+              return fixer.removeRange(getRangeAfterArgToEnd(0, args));
+            },
+            message: `${name}'s second parameter can be omitted when it's false.`,
+          });
+        }
+
+        if (
+          name === "notifyObservers" &&
+          args.length === 3 &&
+          isFalsy(args[2])
+        ) {
+          context.report({
+            node,
+            fix: fixer => {
+              return fixer.removeRange(getRangeAfterArgToEnd(1, args));
+            },
+            message: `${name}'s third parameter can be omitted.`,
+          });
+        }
+
+        if (
+          name === "getComputedStyle" &&
+          args.length === 2 &&
+          isFalsy(args[1])
+        ) {
+          context.report({
+            node,
+            fix: fixer => {
+              return fixer.removeRange(getRangeAfterArgToEnd(0, args));
+            },
+            message: "getComputedStyle's second parameter can be omitted.",
+          });
+        }
+
+        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)
+              );
+            },
+            message: "newURI's last parameters are optional.",
+          });
+        }
+      },
+    };
+  },
+};
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..e58edfcb98
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-removeEventListener.js
@@ -0,0 +1,64 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  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(
+          call,
+          "use {once: true} instead of removeEventListener as " +
+            "the first instruction of the listener"
+        );
+      }
+    },
+  };
+};
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..d16757c347
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-useless-run-test.js
@@ -0,0 +1,72 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    type: "suggestion",
+    fixable: "code",
+  },
+  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 && 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,
+              ]);
+            },
+            message:
+              "Useless run_test function - only contains run_next_test; whole function can be removed",
+          });
+        }
+      },
+    };
+  },
+};
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..543d07b765
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/prefer-boolean-length-check.js
@@ -0,0 +1,130 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+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: {
+    type: "suggestion",
+    fixable: "code",
+  },
+  create(context) {
+    // ---------------------------------------------------------------------------
+    // Public
+    //  --------------------------------------------------------------------------
+
+    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 &&
+            node.left.property.name == "length") ||
+            (node.left.type == "Literal" &&
+              node.left.value == 0 &&
+              node.right.property &&
+              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);
+              },
+              message: "Prefer boolean length check",
+            });
+          } else {
+            context.report({
+              node,
+              fix: fixer => {
+                let generateExpression = funcForBooleanLength(
+                  context,
+                  node,
+                  false
+                );
+                return fixer.replaceText(node, generateExpression);
+              },
+              message: "Prefer boolean length check",
+            });
+          }
+        }
+      },
+    };
+  },
+};
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..45b8c40901
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/prefer-formatValues.js
@@ -0,0 +1,96 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+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",
+      category: "Best Practices",
+    },
+    schema: [],
+  },
+
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  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(
+            callNode,
+            "prefer to use a single document.l10n.formatValues call instead " +
+              "of multiple calls to document.l10n.formatValue or document.l10n.formatValues"
+          );
+        }
+      }
+    }
+
+    return {
+      Program: enterBlock,
+      "Program:exit": exitBlock,
+      BlockStatement: enterBlock,
+      "BlockStatement:exit": exitBlock,
+
+      CallExpression(node) {
+        if (!BlockStack.length) {
+          context.report(node, "call expression found outside of known block");
+        }
+
+        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-chromeutils-import-null.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-chromeutils-import-null.js
new file mode 100644
index 0000000000..b7fd1593b8
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-chromeutils-import-null.js
@@ -0,0 +1,44 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+function isIdentifier(node, id) {
+  return node && node.type === "Identifier" && node.name === id;
+}
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  return {
+    CallExpression(node) {
+      let { callee } = node;
+      if (
+        isIdentifier(callee.object, "ChromeUtils") &&
+        isIdentifier(callee.property, "import") &&
+        node.arguments.length >= 2 &&
+        node.arguments[1].type == "Literal" &&
+        node.arguments[1].raw == "null"
+      ) {
+        context.report(
+          node,
+          "ChromeUtils.import should not be called with (..., null) to " +
+            "retrieve the JSM global object. Rely on explicit exports instead."
+        );
+      }
+    },
+  };
+};
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..a2f495ddb7
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-importGlobalProperties.js
@@ -0,0 +1,62 @@
+/**
+ * @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 privilegedGlobals = Object.keys(
+  require("../environments/privileged.js").globals
+);
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    messages: {
+      unexpectedCall: "Unexpected call to Cu.importGlobalProperties",
+      unexpectedCallWebIdl:
+        "Unnecessary call to Cu.importGlobalProperties (webidl names are automatically imported)",
+    },
+    schema: [
+      {
+        // XXX Better name?
+        enum: ["everything", "allownonwebidl"],
+      },
+    ],
+    type: "problem",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        if (node.callee.type !== "MemberExpression") {
+          return;
+        }
+        let memexp = node.callee;
+        if (
+          memexp.object.type === "Identifier" &&
+          // Only Cu, not Components.utils; see bug 1230369.
+          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: "unexpectedCallWebIdl" });
+              }
+            }
+          } else {
+            context.report({ node, messageId: "unexpectedCall" });
+          }
+        }
+      },
+    };
+  },
+};
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..eb100b13fa
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-relative-requires.js
@@ -0,0 +1,34 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+var helpers = require("../helpers");
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  const isRelativePath = function(path) {
+    return path.startsWith("./") || path.startsWith("../");
+  };
+
+  return {
+    CallExpression(node) {
+      const path = helpers.getDevToolsRequirePath(node);
+      if (path && isRelativePath(path)) {
+        context.report(node, "relative paths are not allowed with require()");
+      }
+    },
+  };
+};
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..ab31069293
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-some-requires.js
@@ -0,0 +1,35 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+var helpers = require("../helpers");
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  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, `require(${path}) is not allowed`);
+      }
+    },
+  };
+};
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..1bc0bcd58d
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/rejects-requires-await.js
@@ -0,0 +1,42 @@
+/**
+ * @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";
+
+module.exports = {
+  meta: {
+    messages: {
+      rejectRequiresAwait: "Assert.rejects needs to be preceded by await.",
+    },
+  },
+
+  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..053f379adb
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-cc-etc.js
@@ -0,0 +1,44 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+const componentsMap = {
+  classes: "Cc",
+  interfaces: "Ci",
+  results: "Cr",
+  utils: "Cu",
+};
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  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,
+          `Use ${componentsMap[node.property.name]} rather than Components.${
+            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..6d72f785de
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-chromeutils-generateqi.js
@@ -0,0 +1,103 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+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: {
+    fixable: "code",
+  },
+
+  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..eefff06e11
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-chromeutils-import.js
@@ -0,0 +1,89 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+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: {
+    schema: [
+      {
+        type: "object",
+        properties: {
+          allowCu: {
+            type: "boolean",
+          },
+        },
+        additionalProperties: false,
+      },
+    ],
+    fixable: "code",
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        if (node.callee.type !== "MemberExpression") {
+          return;
+        }
+
+        let { allowCu } = context.options[0] || {};
+        let { callee } = node;
+
+        // Is the expression starting with `Cu` or `Components.utils`?
+        if (
+          ((!allowCu && 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..7c2ffaf933
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-default-preference-values.js
@@ -0,0 +1,45 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  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;
+      }
+
+      let msg = "provide a default value instead of using a try/catch block";
+      context.report(node, msg);
+    },
+  };
+};
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..d4b3da5f1e
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-includes-instead-of-indexOf.js
@@ -0,0 +1,45 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  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, "use .includes instead of .indexOf");
+      }
+    },
+  };
+};
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..34b22a1269
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-ownerGlobal.js
@@ -0,0 +1,38 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  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,
+        "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..eb693d0014
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-returnValue.js
@@ -0,0 +1,42 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  return {
+    ExpressionStatement(node) {
+      if (
+        !node.expression ||
+        node.expression.type != "CallExpression" ||
+        !node.expression.callee ||
+        node.expression.callee.type != "MemberExpression" ||
+        !node.expression.callee.property ||
+        node.expression.callee.property.type != "Identifier" ||
+        (node.expression.callee.property.name != "concat" &&
+          node.expression.callee.property.name != "join" &&
+          node.expression.callee.property.name != "slice")
+      ) {
+        return;
+      }
+
+      context.report(
+        node,
+        `{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..1235cd0f99
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-services.js
@@ -0,0 +1,45 @@
+/**
+ * @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;
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+  return {
+    CallExpression(node) {
+      if (
+        !node.callee ||
+        !node.callee.property ||
+        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,
+        `Use Services.${serviceName} rather than getService().`
+      );
+    },
+  };
+};
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..9365982b0c
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/var-only-at-top-level.js
@@ -0,0 +1,34 @@
+/**
+ * @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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+var helpers = require("../helpers");
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  return {
+    VariableDeclaration(node) {
+      if (node.kind === "var") {
+        if (helpers.getIsGlobalScope(context.getAncestors())) {
+          return;
+        }
+
+        context.report(node, "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..dd250ee15e
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/services.json
@@ -0,0 +1,50 @@
+{
+    "mozIJSSubScriptLoader": "scriptloader",
+    "mozILocaleService": "locale",
+    "mozIMozIntl": "intl",
+    "mozIStorageService": "storage",
+    "nsIAppShellService": "appShell",
+    "nsIAppStartup": "startup",
+    "nsICacheStorageService": "cache2",
+    "nsICategoryManager": "catMan",
+    "nsIClearDataService": "clearData",
+    "nsIClipboard": "clipboard",
+    "nsIConsoleService": "console",
+    "nsICookieManager": "cookies",
+    "nsIDOMRequestService": "DOMRequest",
+    "nsIDOMStorageManager": "domStorageManager",
+    "nsIDirectoryService": "dirsvc",
+    "nsIDroppedLinkHandler": "droppedLinkHandler",
+    "nsIEffectiveTLDService": "eTLD",
+    "nsIEnterprisePolicies": "policies",
+    "nsIEventListenerService": "els",
+    "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",
+    "nsISpeculativeConnect": "io",
+    "nsIStringBundleService": "strings",
+    "nsISystemInfo": "sysinfo",
+    "nsITelemetry": "telemetry",
+    "nsITextToSubURI": "textToSubURI",
+    "nsIThreadManager": "tm",
+    "nsIURLFormatter": "urlFormatter",
+    "nsIVersionComparator": "vc",
+    "nsIWindowMediator": "wm",
+    "nsIWindowWatcher": "ww",
+    "nsIXULAppInfo": "appinfo",
+    "nsIXULRuntime": "appinfo"
+}
\ No newline at end of file
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..e58dfbb57c
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/manifest.tt
@@ -0,0 +1,10 @@
+[
+  {
+    "algorithm": "sha512",
+    "visibility": "public",
+    "filename": "eslint-plugin-mozilla.tar.gz",
+    "unpack": true,
+    "digest": "196e87a20b68bcafb4fb7893c829beb3d44144f6985a4194bc41b135618f373732ae8e0604ed0548ae5e79f1c0eede33a802fbf4f12678c59a3615c481923912",
+    "size": 5272799
+  }
+]
\ 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..a385b07225
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/package-lock.json
@@ -0,0 +1,2045 @@
+{
+  "name": "eslint-plugin-mozilla",
+  "version": "2.9.2",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
+      "integrity": "sha512-vG6SvB6oYEhvgisZNFRmRCUkLz11c7rp+tbNTynGqc6mS1d5ATd/sGyV6W0KZZnXRKMTzZDRgQT3Ou9jhpAfUg==",
+      "requires": {
+        "@babel/highlight": "^7.10.4"
+      }
+    },
+    "@babel/core": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.8.3.tgz",
+      "integrity": "sha512-4XFkf8AwyrEG7Ziu3L2L0Cv+WyY47Tcsp70JFmpftbAA1K7YL/sgE9jh9HyNj08Y/U50ItUchpN0w6HxAoX1rA==",
+      "requires": {
+        "@babel/code-frame": "^7.8.3",
+        "@babel/generator": "^7.8.3",
+        "@babel/helpers": "^7.8.3",
+        "@babel/parser": "^7.8.3",
+        "@babel/template": "^7.8.3",
+        "@babel/traverse": "^7.8.3",
+        "@babel/types": "^7.8.3",
+        "convert-source-map": "^1.7.0",
+        "debug": "^4.1.0",
+        "gensync": "^1.0.0-beta.1",
+        "json5": "^2.1.0",
+        "lodash": "^4.17.13",
+        "resolve": "^1.3.2",
+        "semver": "^5.4.1",
+        "source-map": "^0.5.0"
+      }
+    },
+    "@babel/generator": {
+      "version": "7.10.5",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.10.5.tgz",
+      "integrity": "sha512-3vXxr3FEW7E7lJZiWQ3bM4+v/Vyr9C+hpolQ8BGFr9Y8Ri2tFLWTixmwKBafDujO1WVah4fhZBeU1bieKdghig==",
+      "requires": {
+        "@babel/types": "^7.10.5",
+        "jsesc": "^2.5.1",
+        "source-map": "^0.5.0"
+      }
+    },
+    "@babel/helper-function-name": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.10.4.tgz",
+      "integrity": "sha512-YdaSyz1n8gY44EmN7x44zBn9zQ1Ry2Y+3GTA+3vH6Mizke1Vw0aWDM66FOYEPw8//qKkmqOckrGgTYa+6sceqQ==",
+      "requires": {
+        "@babel/helper-get-function-arity": "^7.10.4",
+        "@babel/template": "^7.10.4",
+        "@babel/types": "^7.10.4"
+      }
+    },
+    "@babel/helper-get-function-arity": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.10.4.tgz",
+      "integrity": "sha512-EkN3YDB+SRDgiIUnNgcmiD361ti+AVbL3f3Henf6dqqUyr5dMsorno0lJWJuLhDhkI5sYEpgj6y9kB8AOU1I2A==",
+      "requires": {
+        "@babel/types": "^7.10.4"
+      }
+    },
+    "@babel/helper-split-export-declaration": {
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+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-15.0.1.tgz",
+          "integrity": "sha512-0OAMV2mAZQrs3FkNpDQcBk1x5HXb8X4twADss4S0Iuk+2dGnLOE/fRHrsYm542GduMveyA77OF4wrNJuanRCWw==",
+          "dev": true,
+          "requires": {
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
+          }
+        }
+      }
+    }
+  }
+}
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..8edd8684a5
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/package.json
@@ -0,0 +1,55 @@
+{
+  "name": "eslint-plugin-mozilla",
+  "version": "2.9.2",
+  "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": "7.8.3",
+    "babel-eslint": "10.1.0",
+    "eslint-scope": "5.1.0",
+    "eslint-visitor-keys": "1.3.0",
+    "estraverse": "4.3.0",
+    "htmlparser2": "3.10.1",
+    "multi-ini": "2.1.0",
+    "sax": "1.2.4"
+  },
+  "devDependencies": {
+    "eslint": "7.8.0",
+    "mocha": "^8.1.3"
+  },
+  "peerDependencies": {
+    "eslint-config-prettier": "^6.0.0",
+    "eslint-plugin-fetch-options": "^0.0.5",
+    "eslint-plugin-html": "^6.0.0",
+    "eslint-plugin-no-unsanitized": "^3.1.4",
+    "eslint-plugin-prettier": "^3.0.1",
+    "eslint": "^7.8.0",
+    "prettier": "^1.17.0"
+  },
+  "engines": {
+    "node": ">=6.9.1"
+  },
+  "scripts": {
+    "prepack": "node scripts/createExports.js",
+    "test": "mocha --reporter 'reporters/mozilla-format.js' tests",
+    "postpublish": "rm -f lib/modules.json 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..885727e8aa
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/reporters/mozilla-format.js
@@ -0,0 +1,50 @@
+/* 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 = 0;
+
+  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++;
+    // 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
+      }`
+    );
+  });
+
+  runner.on("end", function() {
+    console.log("INFO | Result summary:");
+    console.log(`INFO | Passed: ${passes}`);
+    console.log(`INFO | Failed: ${failures}`);
+    console.log("SUITE-END");
+    process.exit(failures);
+  });
+}
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..60d61b0f72
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/scripts/createExports.js
@@ -0,0 +1,89 @@
+/**
+ * @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 modules.json");
+
+const modulesFile = path.join(eslintDir, "modules.json");
+const shipModulesFile = path.join(
+  eslintDir,
+  "eslint-plugin-mozilla",
+  "lib",
+  "modules.json"
+);
+
+fs.writeFileSync(shipModulesFile, fs.readFileSync(modulesFile));
+
+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..597961e8cc
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/avoid-Date-timing.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/avoid-Date-timing");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 6 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, type, message) {
+  return { code, errors: [{ message, 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",
+      "use performance.now() instead of Date.now() for timing measurements"
+    ),
+    invalidCode(
+      "new Date();",
+      "NewExpression",
+      "use performance.now() instead of new Date() for timing measurements"
+    ),
+  ],
+});
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..e6a146898d
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/avoid-removeChild.js
@@ -0,0 +1,46 @@
+/* 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: 6 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, message) {
+  if (!message) {
+    message =
+      "use element.remove() instead of " +
+      "element.parentNode.removeChild(element)";
+  }
+  return { code, errors: [{ message, 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);",
+      "use element.firstChild.remove() instead of " +
+        "element.removeChild(element.firstChild)"
+    ),
+  ],
+});
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..ca84e3474f
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/balanced-listeners.js
@@ -0,0 +1,89 @@
+/* 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: 6 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function error(code, message) {
+  return {
+    code,
+    errors: [{ message, type: "Identifier" }],
+  };
+}
+
+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);",
+      "No corresponding 'removeEventListener(click)' was found."
+    ),
+
+    error(
+      "elt.addEventListener('click', handler, false);" +
+        "elt.removeEventListener('click', handler, true);",
+      "No corresponding 'removeEventListener(click)' was found."
+    ),
+
+    error(
+      "elt.addEventListener('click', handler, {capture: false});" +
+        "elt.removeEventListener('click', handler, true);",
+      "No corresponding 'removeEventListener(click)' was found."
+    ),
+
+    error(
+      "elt.addEventListener('click', handler, {capture: true});" +
+        "elt.removeEventListener('click', handler);",
+      "No corresponding 'removeEventListener(click)' was found."
+    ),
+
+    error(
+      "elt.addEventListener('click', handler, true);" +
+        "elt.removeEventListener('click', handler);",
+      "No corresponding 'removeEventListener(click)' was found."
+    ),
+  ],
+});
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..e5f31fa969
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/balanced-observers.js
@@ -0,0 +1,74 @@
+/* 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: 6 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function error(code, message) {
+  return {
+    code,
+    errors: [{ message, type: "Identifier" }],
+  };
+}
+
+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');",
+      "No corresponding 'removeObserver(\"observable\")' was found."
+    ),
+
+    error(
+      // wrong observable name for Services.obs.removeObserver
+      "Services.obs.addObserver(observer, 'observable');" +
+        "Services.obs.removeObserver(observer, 'different-observable');",
+      "No corresponding 'removeObserver(\"observable\")' was found."
+    ),
+
+    error(
+      // missing Services.prefs.removeObserver
+      "Services.prefs.addObserver('preference.name', otherObserver);",
+      "No corresponding 'removeObserver(\"preference.name\")' was found."
+    ),
+
+    error(
+      // wrong observable name for Services.prefs.removeObserver
+      "Services.prefs.addObserver('preference.name', otherObserver);" +
+        "Services.prefs.removeObserver('other.preference', otherObserver);",
+      "No corresponding 'removeObserver(\"preference.name\")' was found."
+    ),
+
+    error(
+      // mismatch Services.prefs vs Services.obs
+      "Services.obs.addObserver(observer, 'observable');" +
+        "Services.prefs.removeObserver(observer, 'observable');",
+      "No corresponding 'removeObserver(\"observable\")' was found."
+    ),
+
+    error(
+      "Services.prefs.addObserver('preference.name', otherObserver);" +
+        // mismatch Services.prefs vs Services.obs
+        "Services.obs.removeObserver('preference.name', otherObserver);",
+      "No corresponding 'removeObserver(\"preference.name\")' was found."
+    ),
+  ],
+});
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..b6b5b849b9
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/consistent-if-bracing.js
@@ -0,0 +1,40 @@
+/* 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: 8 } });
+
+// ------------------------------------------------------------------------------
+// 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 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/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..d004650997
--- /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: 6 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, type, message) {
+  return { code, errors: [{ message, 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",
+      "EXPORTED_SYMBOLS cannot be declared via `let`. Use `var` or `this.EXPORTED_SYMBOLS =`"
+    ),
+    invalidCode(
+      "var EXPORTED_SYMBOLS = 'foo';",
+      "VariableDeclaration",
+      "Unexpected assignment of non-Array to EXPORTED_SYMBOLS"
+    ),
+    invalidCode(
+      "this.EXPORTED_SYMBOLS = 'foo';",
+      "AssignmentExpression",
+      "Unexpected assignment of non-Array to EXPORTED_SYMBOLS"
+    ),
+  ],
+});
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..907b439b3c
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-arbitrary-setTimeout.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/no-arbitrary-setTimeout");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 6 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function wrapCode(code, filename = "xpcshell/test_foo.js") {
+  return { code, filename };
+}
+
+function invalidCode(code) {
+  let message =
+    "listen for events instead of setTimeout() with arbitrary delay";
+  let obj = wrapCode(code);
+  obj.errors = [{ message, 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..722e6b5dda
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-compare-against-boolean-literals.js
@@ -0,0 +1,61 @@
+/* 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: 6 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function callError(message) {
+  return [{ message, type: "BinaryExpression" }];
+}
+
+const MESSAGE = "Don't compare for inexact equality against boolean literals";
+
+ruleTester.run("no-compare-against-boolean-literals", rule, {
+  valid: [`if (!foo) {}`, `if (!!foo) {}`],
+  invalid: [
+    {
+      code: `if (foo == true) {}`,
+      errors: callError(MESSAGE),
+    },
+    {
+      code: `if (foo != true) {}`,
+      errors: callError(MESSAGE),
+    },
+    {
+      code: `if (foo == false) {}`,
+      errors: callError(MESSAGE),
+    },
+    {
+      code: `if (foo != false) {}`,
+      errors: callError(MESSAGE),
+    },
+    {
+      code: `if (true == foo) {}`,
+      errors: callError(MESSAGE),
+    },
+    {
+      code: `if (true != foo) {}`,
+      errors: callError(MESSAGE),
+    },
+    {
+      code: `if (false == foo) {}`,
+      errors: callError(MESSAGE),
+    },
+    {
+      code: `if (false != foo) {}`,
+      errors: callError(MESSAGE),
+    },
+  ],
+});
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..735c7f4654
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-define-cc-etc.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-define-cc-etc");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 9 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, varNames) {
+  if (!Array.isArray(varNames)) {
+    varNames = [varNames];
+  }
+  return {
+    code,
+    errors: varNames.map(name => {
+      return {
+        message: `${name} is now defined in global scope, a separate definition is no longer necessary.`,
+        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-throw-cr-literal.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-throw-cr-literal.js
new file mode 100644
index 0000000000..6750213e72
--- /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: 6 } });
+
+// ------------------------------------------------------------------------------
+// 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..0c9b12f6eb
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-useless-parameters.js
@@ -0,0 +1,147 @@
+/* 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: 6 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function callError(message) {
+  return [{ message, 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("clearUserPref takes only 1 parameter."),
+    },
+    {
+      code: "Services.prefs.clearUserPref('browser.search.custom',\n   false);",
+      output: "Services.prefs.clearUserPref('browser.search.custom');",
+      errors: callError("clearUserPref takes only 1 parameter."),
+    },
+    {
+      code: "Services.removeObserver('notification name', {}, false);",
+      output: "Services.removeObserver('notification name', {});",
+      errors: callError("removeObserver only takes 2 parameters."),
+    },
+    {
+      code: "Services.removeObserver('notification name', {}, true);",
+      output: "Services.removeObserver('notification name', {});",
+      errors: callError("removeObserver only takes 2 parameters."),
+    },
+    {
+      code: "Services.io.newURI('http://example.com', null, null);",
+      output: "Services.io.newURI('http://example.com');",
+      errors: callError("newURI's last parameters are optional."),
+    },
+    {
+      code: "Services.io.newURI('http://example.com', 'utf8', null);",
+      output: "Services.io.newURI('http://example.com', 'utf8');",
+      errors: callError("newURI's last parameters are optional."),
+    },
+    {
+      code: "Services.io.newURI('http://example.com', null);",
+      output: "Services.io.newURI('http://example.com');",
+      errors: callError("newURI's last parameters are optional."),
+    },
+    {
+      code: "Services.io.newURI('http://example.com', '', '');",
+      output: "Services.io.newURI('http://example.com');",
+      errors: callError("newURI's last parameters are optional."),
+    },
+    {
+      code: "Services.io.newURI('http://example.com', '');",
+      output: "Services.io.newURI('http://example.com');",
+      errors: callError("newURI's last parameters are optional."),
+    },
+    {
+      code: "elt.addEventListener('click', handler, false);",
+      output: "elt.addEventListener('click', handler);",
+      errors: callError(
+        "addEventListener's third parameter can be omitted when it's false."
+      ),
+    },
+    {
+      code: "elt.removeEventListener('click', handler, false);",
+      output: "elt.removeEventListener('click', handler);",
+      errors: callError(
+        "removeEventListener's third parameter can be omitted when it's" +
+          " false."
+      ),
+    },
+    {
+      code: "Services.obs.addObserver(this, 'topic', false);",
+      output: "Services.obs.addObserver(this, 'topic');",
+      errors: callError(
+        "addObserver's third parameter can be omitted when it's false."
+      ),
+    },
+    {
+      code: "Services.prefs.addObserver('branch', this, false);",
+      output: "Services.prefs.addObserver('branch', this);",
+      errors: callError(
+        "addObserver's third parameter can be omitted when it's false."
+      ),
+    },
+    {
+      code: "array.appendElement(elt, false);",
+      output: "array.appendElement(elt);",
+      errors: callError(
+        "appendElement's second parameter can be omitted when it's false."
+      ),
+    },
+    {
+      code: "Services.obs.notifyObservers(obj, 'topic', null);",
+      output: "Services.obs.notifyObservers(obj, 'topic');",
+      errors: callError("notifyObservers's third parameter can be omitted."),
+    },
+    {
+      code: "Services.obs.notifyObservers(obj, 'topic', '');",
+      output: "Services.obs.notifyObservers(obj, 'topic');",
+      errors: callError("notifyObservers's third parameter can be omitted."),
+    },
+    {
+      code: "window.getComputedStyle(elt, null);",
+      output: "window.getComputedStyle(elt);",
+      errors: callError("getComputedStyle's second parameter can be omitted."),
+    },
+    {
+      code: "window.getComputedStyle(elt, '');",
+      output: "window.getComputedStyle(elt);",
+      errors: callError("getComputedStyle's second parameter can be omitted."),
+    },
+  ],
+});
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..9f59c78d05
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-useless-removeEventListener.js
@@ -0,0 +1,99 @@
+/* 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: 6 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code) {
+  let message =
+    "use {once: true} instead of removeEventListener " +
+    "as the first instruction of the listener";
+  return { code, errors: [{ message, 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..3541467143
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-useless-run-test.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/no-useless-run-test");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 6 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, output) {
+  let message =
+    "Useless run_test function - only contains run_next_test; whole function can be removed";
+  return { code, output, errors: [{ message, 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..daf3c6f3d9
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/prefer-boolean-length-check.js
@@ -0,0 +1,97 @@
+/* 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: 6 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidError() {
+  let message = "Prefer boolean length check";
+  return [{ message, 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..0883130f17
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/prefer-formatValues.js
@@ -0,0 +1,72 @@
+/* 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: 6 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function error(line, column = undefined) {
+  return {
+    message:
+      "prefer to use a single document.l10n.formatValues call instead " +
+      "of multiple calls to document.l10n.formatValue or document.l10n.formatValues",
+    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-chromeutils-import-null.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-chromeutils-import-null.js
new file mode 100644
index 0000000000..6584f728ac
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-chromeutils-import-null.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/reject-chromeutils-import-null");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 8 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidError() {
+  let message =
+    "ChromeUtils.import should not be called with (..., null) to " +
+    "retrieve the JSM global object. Rely on explicit exports instead.";
+  return [{ message, type: "CallExpression" }];
+}
+
+ruleTester.run("reject-chromeutils-import-null", rule, {
+  valid: ['ChromeUtils.import("resource://some/path/to/My.jsm")'],
+  invalid: [
+    {
+      code: 'ChromeUtils.import("resource://some/path/to/My.jsm", null)',
+      errors: invalidError(),
+    },
+    {
+      code: `
+ChromeUtils.import(
+  "resource://some/path/to/My.jsm",
+  null
+);`,
+      errors: invalidError(),
+    },
+  ],
+});
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..04c0e0408b
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-importGlobalProperties.js
@@ -0,0 +1,46 @@
+/* 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: 8 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+ruleTester.run("reject-importGlobalProperties", rule, {
+  valid: [
+    {
+      code: "Cu.something();",
+    },
+    {
+      options: ["allownonwebidl"],
+      code: "Cu.importGlobalProperties(['fetch'])",
+    },
+  ],
+  invalid: [
+    {
+      code: "Cu.importGlobalProperties(['fetch'])",
+      options: ["everything"],
+      errors: [{ messageId: "unexpectedCall" }],
+    },
+    {
+      code: "Cu.importGlobalProperties(['TextEncoder'])",
+      options: ["everything"],
+      errors: [{ messageId: "unexpectedCall" }],
+    },
+    {
+      code: "Cu.importGlobalProperties(['TextEncoder'])",
+      options: ["allownonwebidl"],
+      errors: [{ messageId: "unexpectedCallWebIdl" }],
+    },
+  ],
+});
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..19f30559ec
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-relative-requires.js
@@ -0,0 +1,58 @@
+/* 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: 8 } });
+
+// ------------------------------------------------------------------------------
+// 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-some-requires.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-some-requires.js
new file mode 100644
index 0000000000..b56dd2cf96
--- /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: 8 } });
+
+// ------------------------------------------------------------------------------
+// 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/rejects-requires-await.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/rejects-requires-await.js
new file mode 100644
index 0000000000..ea6273a8ee
--- /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: 8 } });
+
+// ------------------------------------------------------------------------------
+// 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..7ad729d22b
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-cc-etc.js
@@ -0,0 +1,55 @@
+/* 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: 6 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, originalName, newName) {
+  return {
+    code,
+    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"
+    ),
+    invalidCode(
+      "let bar = Components.interfaces.bar;",
+      "Components.interfaces",
+      "Ci"
+    ),
+    invalidCode(
+      "Components.results.NS_ERROR_ILLEGAL_INPUT;",
+      "Components.results",
+      "Cr"
+    ),
+    invalidCode(
+      "Components.utils.reportError('fake');",
+      "Components.utils",
+      "Cu"
+    ),
+  ],
+});
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..26c6b350bc
--- /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: 6 } });
+
+// ------------------------------------------------------------------------------
+// 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..635c436233
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-chromeutils-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-chromeutils-import");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 6 } });
+
+// ------------------------------------------------------------------------------
+// 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/Service.jsm");`,
+    `ChromeUtils.import("resource://gre/modules/Service.jsm", this);`,
+    `ChromeUtils.defineModuleGetter(this, "Services",
+                                    "resource://gre/modules/Service.jsm");`,
+    `XPCOMUtils.defineLazyModuleGetter(this, "Services",
+                                       "resource://gre/modules/Service.jsm",
+                                       "Foo");`,
+    `XPCOMUtils.defineLazyModuleGetter(this, "Services",
+                                       "resource://gre/modules/Service.jsm",
+                                       undefined, preServicesLambda);`,
+    {
+      options: [{ allowCu: true }],
+      code: `Cu.import("resource://gre/modules/Service.jsm");`,
+    },
+  ],
+  invalid: [
+    {
+      code: `Cu.import("resource://gre/modules/Services.jsm");`,
+      output: `ChromeUtils.import("resource://gre/modules/Services.jsm");`,
+      errors: callError(MESSAGE_IMPORT),
+    },
+    {
+      code: `Cu.import("resource://gre/modules/Services.jsm", this);`,
+      output: `ChromeUtils.import("resource://gre/modules/Services.jsm", this);`,
+      errors: callError(MESSAGE_IMPORT),
+    },
+    {
+      code: `Components.utils.import("resource://gre/modules/Services.jsm");`,
+      output: `ChromeUtils.import("resource://gre/modules/Services.jsm");`,
+      errors: callError(MESSAGE_IMPORT),
+    },
+    {
+      code: `Components.utils.import("resource://gre/modules/Services.jsm");`,
+      output: `ChromeUtils.import("resource://gre/modules/Services.jsm");`,
+      errors: callError(MESSAGE_IMPORT),
+    },
+    {
+      options: [{ allowCu: true }],
+      code: `Components.utils.import("resource://gre/modules/Services.jsm", this);`,
+      output: `ChromeUtils.import("resource://gre/modules/Services.jsm", this);`,
+      errors: callError(MESSAGE_IMPORT),
+    },
+    {
+      code: `XPCOMUtils.defineLazyModuleGetter(this, "Services",
+                                               "resource://gre/modules/Services.jsm");`,
+      output: `ChromeUtils.defineModuleGetter(this, "Services",
+                                               "resource://gre/modules/Services.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..f4ad001a08
--- /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: 6 } });
+
+// ------------------------------------------------------------------------------
+// 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..cb1810b305
--- /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: 6 } });
+
+// ------------------------------------------------------------------------------
+// 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-ownerGlobal.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-ownerGlobal.js
new file mode 100644
index 0000000000..b08bdf1632
--- /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: 6 } });
+
+// ------------------------------------------------------------------------------
+// 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..81952452e4
--- /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: 6 } });
+
+// ------------------------------------------------------------------------------
+// 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..b8d5338fc4
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-services.js
@@ -0,0 +1,40 @@
+/* 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: 6 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, name) {
+  let message = `Use Services.${name} rather than getService().`;
+  return { code, errors: [{ message, type: "CallExpression" }] };
+}
+
+ruleTester.run("use-services", rule, {
+  valid: [
+    'Cc["@mozilla.org/uuid-generator;1"].getService(Ci.nsIUUIDGenerator)',
+    'Components.classes["@mozilla.org/uuid-generator;1"].getService(Components.interfaces.nsIUUIDGenerator)',
+    "Services.wm.addListener()",
+  ],
+  invalid: [
+    invalidCode(
+      'Cc["@mozilla.org/appshell/window-mediator;1"].getService(Ci.nsIWindowMediator);',
+      "wm"
+    ),
+    invalidCode(
+      'Components.classes["@mozilla.org/toolkit/app-startup;1"].getService(Components.interfaces.nsIAppStartup);',
+      "startup"
+    ),
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/update.sh b/tools/lint/eslint/eslint-plugin-mozilla/update.sh
new file mode 100755
index 0000000000..d8ee4098ec
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/update.sh
@@ -0,0 +1,61 @@
+#!/bin/sh
+# Script to regenerate the npm packages used for eslint-plugin-mozilla by the builders.
+# Requires
+
+# Force the scripts working directory to be projdir/tools/lint/eslint/eslint-plugin-mozilla.
+DIR="$( 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..."
+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."