Adding upstream version 86.0.1.upstream/86.0.1upstream

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

259 files changed, 20755 insertions, 0 deletions

diff --git a/tools/lint/android-api-lint.yml b/tools/lint/android-api-lint.yml
new file mode 100644
index 0000000000..0b81e79a83
--- /dev/null
+++ b/tools/lint/android-api-lint.yml
@@ -0,0 +1,15 @@
+---
+android-api-lint:
+    description: Android api-lint
+    include: ['mobile/android']
+    exclude: []
+    extensions: ['java', 'kt']
+    support-files:
+        - 'mobile/android/**/Makefile.in'
+        - 'mobile/android/config/**'
+        - 'mobile/android/gradle.configure'
+        - 'mobile/android/**/moz.build'
+        - '**/*.gradle'
+    type: global
+    payload: android.lints:api_lint
+    setup: android.lints:setup
diff --git a/tools/lint/android-checkstyle.yml b/tools/lint/android-checkstyle.yml
new file mode 100644
index 0000000000..abd4974e6a
--- /dev/null
+++ b/tools/lint/android-checkstyle.yml
@@ -0,0 +1,15 @@
+---
+android-checkstyle:
+    description: Android checkstyle
+    include: ['mobile/android']
+    exclude: []
+    extensions: ['java', 'kt']
+    support-files:
+        - 'mobile/android/**/Makefile.in'
+        - 'mobile/android/config/**'
+        - 'mobile/android/gradle.configure'
+        - 'mobile/android/**/moz.build'
+        - '**/*.gradle'
+    type: global
+    payload: android.lints:checkstyle
+    setup: android.lints:setup
diff --git a/tools/lint/android-javadoc.yml b/tools/lint/android-javadoc.yml
new file mode 100644
index 0000000000..a0811a08cd
--- /dev/null
+++ b/tools/lint/android-javadoc.yml
@@ -0,0 +1,15 @@
+---
+android-javadoc:
+    description: Android javadoc
+    include: ['mobile/android/geckoview']
+    exclude: []
+    extensions: ['java', 'kt']
+    support-files:
+        - 'mobile/android/**/Makefile.in'
+        - 'mobile/android/config/**'
+        - 'mobile/android/gradle.configure'
+        - 'mobile/android/**/moz.build'
+        - '**/*.gradle'
+    type: global
+    payload: android.lints:javadoc
+    setup: android.lints:setup
diff --git a/tools/lint/android-lint.yml b/tools/lint/android-lint.yml
new file mode 100644
index 0000000000..6a1dbe7b74
--- /dev/null
+++ b/tools/lint/android-lint.yml
@@ -0,0 +1,15 @@
+---
+android-lint:
+    description: Android lint
+    include: ['mobile/android']
+    exclude: []
+    extensions: ['java', 'kt']
+    support-files:
+        - 'mobile/android/**/Makefile.in'
+        - 'mobile/android/config/**'
+        - 'mobile/android/gradle.configure'
+        - 'mobile/android/**/moz.build'
+        - '**/*.gradle'
+    type: global
+    payload: android.lints:lint
+    setup: android.lints:setup
diff --git a/tools/lint/android-test.yml b/tools/lint/android-test.yml
new file mode 100644
index 0000000000..65739295dd
--- /dev/null
+++ b/tools/lint/android-test.yml
@@ -0,0 +1,15 @@
+---
+android-test:
+    description: Android test
+    include: ['mobile/android']
+    exclude: []
+    extensions: ['java', 'kt']
+    support-files:
+        - 'mobile/android/**/Makefile.in'
+        - 'mobile/android/config/**'
+        - 'mobile/android/gradle.configure'
+        - 'mobile/android/**/moz.build'
+        - '**/*.gradle'
+    type: global
+    payload: android.lints:test
+    setup: android.lints:setup
diff --git a/tools/lint/android/__init__.py b/tools/lint/android/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/tools/lint/android/__init__.py
diff --git a/tools/lint/android/lints.py b/tools/lint/android/lints.py
new file mode 100644
index 0000000000..617df22e78
--- /dev/null
+++ b/tools/lint/android/lints.py
@@ -0,0 +1,345 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import itertools
+import json
+import os
+import re
+import six
+import subprocess
+import sys
+
+import xml.etree.ElementTree as ET
+
+from mozpack.files import FileFinder
+import mozpack.path as mozpath
+from mozlint import result
+
+
+# The Gradle target invocations are serialized with a simple locking file scheme.  It's fine for
+# them to take a while, since the first will compile all the Java, etc, and then perform
+# potentially expensive static analyses.
+GRADLE_LOCK_MAX_WAIT_SECONDS = 20 * 60
+
+
+def setup(root, **setupargs):
+    if setupargs.get("substs", {}).get("MOZ_BUILD_APP") != "mobile/android":
+        return 1
+
+    if "topobjdir" not in setupargs:
+        print(
+            "Skipping {}: a configured Android build is required!".format(
+                setupargs["name"]
+            )
+        )
+        return 1
+
+    return 0
+
+
+def gradle(log, topsrcdir=None, topobjdir=None, tasks=[], extra_args=[], verbose=True):
+    sys.path.insert(0, os.path.join(topsrcdir, "mobile", "android"))
+    from gradle import gradle_lock
+
+    with gradle_lock(topobjdir, max_wait_seconds=GRADLE_LOCK_MAX_WAIT_SECONDS):
+        # The android-lint parameter can be used by gradle tasks to run special
+        # logic when they are run for a lint using
+        #   project.hasProperty('android-lint')
+        cmd_args = (
+            [
+                sys.executable,
+                os.path.join(topsrcdir, "mach"),
+                "gradle",
+                "--verbose",
+                "-Pandroid-lint",
+                "--",
+            ]
+            + tasks
+            + extra_args
+        )
+
+        cmd = " ".join(six.moves.shlex_quote(arg) for arg in cmd_args)
+        log.debug(cmd)
+
+        # Gradle and mozprocess do not get along well, so we use subprocess
+        # directly.
+        proc = subprocess.Popen(cmd_args, cwd=topsrcdir)
+        status = None
+        # Leave it to the subprocess to handle Ctrl+C. If it terminates as a result
+        # of Ctrl+C, proc.wait() will return a status code, and, we get out of the
+        # loop. If it doesn't, like e.g. gdb, we continue waiting.
+        while status is None:
+            try:
+                status = proc.wait()
+            except KeyboardInterrupt:
+                pass
+
+        try:
+            proc.wait()
+        except KeyboardInterrupt:
+            proc.kill()
+            raise
+
+
+def api_lint(config, **lintargs):
+    topsrcdir = lintargs["root"]
+    topobjdir = lintargs["topobjdir"]
+
+    gradle(
+        lintargs["log"],
+        topsrcdir=topsrcdir,
+        topobjdir=topobjdir,
+        tasks=lintargs["substs"]["GRADLE_ANDROID_API_LINT_TASKS"],
+        extra_args=lintargs.get("extra_args") or [],
+    )
+
+    folder = lintargs["substs"]["GRADLE_ANDROID_GECKOVIEW_APILINT_FOLDER"]
+
+    results = []
+
+    with open(os.path.join(topobjdir, folder, "apilint-result.json")) as f:
+        issues = json.load(f)
+
+        for rule in ("compat_failures", "failures"):
+            for r in issues[rule]:
+                err = {
+                    "rule": r["rule"] if rule == "failures" else "compat_failures",
+                    "path": mozpath.relpath(r["file"], topsrcdir),
+                    "lineno": int(r["line"]),
+                    "column": int(r.get("column") or 0),
+                    "message": r["msg"],
+                    "level": "error" if r["error"] else "warning",
+                }
+                results.append(result.from_config(config, **err))
+
+        for r in issues["api_changes"]:
+            err = {
+                "rule": "api_changes",
+                "path": mozpath.relpath(r["file"], topsrcdir),
+                "lineno": int(r["line"]),
+                "column": int(r.get("column") or 0),
+                "message": "Unexpected api change. Please run ./gradlew {} for more "
+                "information".format(
+                    " ".join(lintargs["substs"]["GRADLE_ANDROID_API_LINT_TASKS"])
+                ),
+            }
+            results.append(result.from_config(config, **err))
+
+    return results
+
+
+def javadoc(config, **lintargs):
+    topsrcdir = lintargs["root"]
+    topobjdir = lintargs["topobjdir"]
+
+    gradle(
+        lintargs["log"],
+        topsrcdir=topsrcdir,
+        topobjdir=topobjdir,
+        tasks=lintargs["substs"]["GRADLE_ANDROID_GECKOVIEW_DOCS_TASKS"],
+        extra_args=lintargs.get("extra_args") or [],
+    )
+
+    output_files = lintargs["substs"]["GRADLE_ANDROID_GECKOVIEW_DOCS_OUTPUT_FILES"]
+
+    results = []
+
+    for output_file in output_files:
+        with open(os.path.join(topobjdir, output_file)) as f:
+            # Like: '[{"path":"/absolute/path/to/topsrcdir/mobile/android/geckoview/src/main/java/org/mozilla/geckoview/ContentBlocking.java","lineno":"462","level":"warning","message":"no @return"}]'.  # NOQA: E501
+            issues = json.load(f)
+
+            for issue in issues:
+                issue["path"] = issue["path"].replace(lintargs["root"], "")
+                # We want warnings to be errors for linting purposes.
+                issue["level"] = "error"
+                results.append(result.from_config(config, **issue))
+
+    return results
+
+
+def lint(config, **lintargs):
+    topsrcdir = lintargs["root"]
+    topobjdir = lintargs["topobjdir"]
+
+    gradle(
+        lintargs["log"],
+        topsrcdir=topsrcdir,
+        topobjdir=topobjdir,
+        tasks=lintargs["substs"]["GRADLE_ANDROID_LINT_TASKS"],
+        extra_args=lintargs.get("extra_args") or [],
+    )
+
+    # It's surprising that this is the App variant name, but this is "withoutGeckoBinariesDebug"
+    # right now and the GeckoView variant name is "withGeckoBinariesDebug".  This will be addressed
+    # as we unify variants.
+    path = os.path.join(
+        lintargs["topobjdir"],
+        "gradle/build/mobile/android/geckoview/reports",
+        "lint-results-{}.xml".format(
+            lintargs["substs"]["GRADLE_ANDROID_GECKOVIEW_VARIANT_NAME"]
+        ),
+    )
+    tree = ET.parse(open(path, "rt"))
+    root = tree.getroot()
+
+    results = []
+
+    for issue in root.findall("issue"):
+        location = issue[0]
+        err = {
+            "level": issue.get("severity").lower(),
+            "rule": issue.get("id"),
+            "message": issue.get("message"),
+            "path": location.get("file").replace(lintargs["root"], ""),
+            "lineno": int(location.get("line") or 0),
+        }
+        results.append(result.from_config(config, **err))
+
+    return results
+
+
+def _parse_checkstyle_output(config, topsrcdir=None, report_path=None):
+    tree = ET.parse(open(report_path, "rt"))
+    root = tree.getroot()
+
+    for file in root.findall("file"):
+        sourcepath = file.get("name").replace(topsrcdir + "/", "")
+
+        for error in file.findall("error"):
+            # Like <error column="42" line="22" message="Name 'mPorts' must match pattern 'xm[A-Z][A-Za-z]*$'." severity="error" source="com.puppycrawl.tools.checkstyle.checks.naming.MemberNameCheck" />.  # NOQA: E501
+            err = {
+                "level": "error",
+                "rule": error.get("source"),
+                "message": error.get("message"),
+                "path": sourcepath,
+                "lineno": int(error.get("line") or 0),
+                "column": int(error.get("column") or 0),
+            }
+            yield result.from_config(config, **err)
+
+
+def checkstyle(config, **lintargs):
+    topsrcdir = lintargs["root"]
+    topobjdir = lintargs["topobjdir"]
+
+    gradle(
+        lintargs["log"],
+        topsrcdir=topsrcdir,
+        topobjdir=topobjdir,
+        tasks=lintargs["substs"]["GRADLE_ANDROID_CHECKSTYLE_TASKS"],
+        extra_args=lintargs.get("extra_args") or [],
+    )
+
+    results = []
+
+    for relative_path in lintargs["substs"]["GRADLE_ANDROID_CHECKSTYLE_OUTPUT_FILES"]:
+        report_path = os.path.join(lintargs["topobjdir"], relative_path)
+        results.extend(
+            _parse_checkstyle_output(
+                config, topsrcdir=lintargs["root"], report_path=report_path
+            )
+        )
+
+    return results
+
+
+def _parse_android_test_results(config, topsrcdir=None, report_dir=None):
+    # A brute force way to turn a Java FQN into a path on disk.  Assumes Java
+    # and Kotlin sources are in mobile/android for performance and simplicity.
+    sourcepath_finder = FileFinder(os.path.join(topsrcdir, "mobile", "android"))
+
+    finder = FileFinder(report_dir)
+    reports = list(finder.find("TEST-*.xml"))
+    if not reports:
+        raise RuntimeError("No reports found under {}".format(report_dir))
+
+    for report, _ in reports:
+        tree = ET.parse(open(os.path.join(finder.base, report), "rt"))
+        root = tree.getroot()
+
+        class_name = root.get(
+            "name"
+        )  # Like 'org.mozilla.gecko.permissions.TestPermissions'.
+        path = (
+            "**/" + class_name.replace(".", "/") + ".*"
+        )  # Like '**/org/mozilla/gecko/permissions/TestPermissions.*'.  # NOQA: E501
+
+        for testcase in root.findall("testcase"):
+            function_name = testcase.get("name")
+
+            # Schema cribbed from http://llg.cubic.org/docs/junit/.
+            for unexpected in itertools.chain(
+                testcase.findall("error"), testcase.findall("failure")
+            ):
+                sourcepaths = list(sourcepath_finder.find(path))
+                if not sourcepaths:
+                    raise RuntimeError(
+                        "No sourcepath found for class {class_name}".format(
+                            class_name=class_name
+                        )
+                    )
+
+                for sourcepath, _ in sourcepaths:
+                    lineno = 0
+                    message = unexpected.get("message")
+                    # Turn '... at org.mozilla.gecko.permissions.TestPermissions.testMultipleRequestsAreQueuedAndDispatchedSequentially(TestPermissions.java:118)' into 118.  # NOQA: E501
+                    pattern = r"at {class_name}\.{function_name}\(.*:(\d+)\)"
+                    pattern = pattern.format(
+                        class_name=class_name, function_name=function_name
+                    )
+                    match = re.search(pattern, message)
+                    if match:
+                        lineno = int(match.group(1))
+                    else:
+                        msg = "No source line found for {class_name}.{function_name}".format(
+                            class_name=class_name, function_name=function_name
+                        )
+                        raise RuntimeError(msg)
+
+                    err = {
+                        "level": "error",
+                        "rule": unexpected.get("type"),
+                        "message": message,
+                        "path": os.path.join("mobile", "android", sourcepath),
+                        "lineno": lineno,
+                    }
+                    yield result.from_config(config, **err)
+
+
+def test(config, **lintargs):
+    topsrcdir = lintargs["root"]
+    topobjdir = lintargs["topobjdir"]
+
+    gradle(
+        lintargs["log"],
+        topsrcdir=topsrcdir,
+        topobjdir=topobjdir,
+        tasks=lintargs["substs"]["GRADLE_ANDROID_TEST_TASKS"],
+        extra_args=lintargs.get("extra_args") or [],
+    )
+
+    results = []
+
+    def capitalize(s):
+        # Can't use str.capitalize because it lower cases trailing letters.
+        return (s[0].upper() + s[1:]) if s else ""
+
+    pairs = [("geckoview", lintargs["substs"]["GRADLE_ANDROID_GECKOVIEW_VARIANT_NAME"])]
+    for project, variant in pairs:
+        report_dir = os.path.join(
+            lintargs["topobjdir"],
+            "gradle/build/mobile/android/{}/test-results/test{}UnitTest".format(
+                project, capitalize(variant)
+            ),
+        )
+    results.extend(
+        _parse_android_test_results(
+            config, topsrcdir=lintargs["root"], report_dir=report_dir
+        )
+    )
+
+    return results
diff --git a/tools/lint/black.yml b/tools/lint/black.yml
new file mode 100644
index 0000000000..79fdee1342
--- /dev/null
+++ b/tools/lint/black.yml
@@ -0,0 +1,19 @@
+---
+black:
+    description: Reformat python
+    exclude:
+        - gfx/harfbuzz/src/meson.build
+        - layout/style/ServoCSSPropList.mako.py
+        - python/mozbuild/mozbuild/fork_interpose.py
+        - python/mozbuild/mozbuild/test/frontend/data/reader-error-syntax/moz.build
+        - testing/mozharness/configs/test/test_malformed.py
+        - testing/web-platform/tests
+    extensions:
+        - build
+        - configure
+        - py
+    support-files:
+        - 'tools/lint/python/**'
+    type: external
+    payload: python.black:lint
+    setup: python.black:setup
diff --git a/tools/lint/clang-format.yml b/tools/lint/clang-format.yml
new file mode 100644
index 0000000000..0545612c10
--- /dev/null
+++ b/tools/lint/clang-format.yml
@@ -0,0 +1,11 @@
+---
+clang-format:
+    description: Reformat C/C++
+    include:
+        - '.'
+    extensions: ['cpp', 'c', 'cc', 'h', 'm', 'mm']
+    support-files:
+        - 'tools/lint/clang-format/**'
+    type: external
+    payload: clang-format:lint
+    code_review_warnings: false
diff --git a/tools/lint/clang-format/__init__.py b/tools/lint/clang-format/__init__.py
new file mode 100644
index 0000000000..fb0ed9a654
--- /dev/null
+++ b/tools/lint/clang-format/__init__.py
@@ -0,0 +1,176 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import signal
+import re
+
+from buildconfig import substs
+from mozboot.util import get_state_dir
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+from mozprocess import ProcessHandler
+
+CLANG_FORMAT_NOT_FOUND = """
+Could not find clang-format! Install clang-format with:
+
+    $ ./mach bootstrap
+
+And make sure that it is in the PATH
+""".strip()
+
+
+def parse_issues(config, output, paths, log):
+
+    diff_line = re.compile("^(.*):(.*):(.*): warning: .*;(.*);(.*)")
+    results = []
+    for line in output:
+        match = diff_line.match(line)
+        file, line_no, col, diff, diff2 = match.groups()
+        log.debug(
+            "file={} line={} col={} diff={} diff2={}".format(
+                file, line_no, col, diff, diff2
+            )
+        )
+        d = diff + "\n" + diff2
+        res = {
+            "path": file,
+            "diff": d,
+            "level": "warning",
+            "lineno": line_no,
+            "column": col,
+        }
+        results.append(result.from_config(config, **res))
+
+    return results
+
+
+class ClangFormatProcess(ProcessHandler):
+    def __init__(self, config, *args, **kwargs):
+        self.config = config
+        kwargs["stream"] = False
+        kwargs["universal_newlines"] = True
+        ProcessHandler.__init__(self, *args, **kwargs)
+
+    def run(self, *args, **kwargs):
+        orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+        ProcessHandler.run(self, *args, **kwargs)
+        signal.signal(signal.SIGINT, orig)
+
+
+def run_process(config, cmd):
+    proc = ClangFormatProcess(config, cmd)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+    return proc.output
+
+
+def get_clang_format_binary():
+    """
+    Returns the path of the first clang-format binary available
+    if not found returns None
+    """
+    binary = os.environ.get("CLANG_FORMAT")
+    if binary:
+        return binary
+
+    clang_tools_path = os.path.join(get_state_dir(), "clang-tools")
+    bin_path = os.path.join(clang_tools_path, "clang-tidy", "bin")
+    return os.path.join(bin_path, "clang-format" + substs.get("HOST_BIN_SUFFIX", ""))
+
+
+def is_ignored_path(ignored_dir_re, topsrcdir, f):
+    # Remove up to topsrcdir in pathname and match
+    if f.startswith(topsrcdir + "/"):
+        match_f = f[len(topsrcdir + "/") :]
+    else:
+        match_f = f
+    return re.match(ignored_dir_re, match_f)
+
+
+def remove_ignored_path(paths, topsrcdir, log):
+    path_to_third_party = os.path.join(topsrcdir, ".clang-format-ignore")
+
+    ignored_dir = []
+    with open(path_to_third_party, "r") as fh:
+        for line in fh:
+            # In case it starts with a space
+            line = line.strip()
+            # Remove comments and empty lines
+            if line.startswith("#") or len(line) == 0:
+                continue
+            # The regexp is to make sure we are managing relative paths
+            ignored_dir.append(r"^[\./]*" + line.rstrip())
+
+    # Generates the list of regexp
+    ignored_dir_re = "(%s)" % "|".join(ignored_dir)
+
+    path_list = []
+    for f in paths:
+        if is_ignored_path(ignored_dir_re, topsrcdir, f):
+            # Early exit if we have provided an ignored directory
+            log.debug("Ignored third party code '{0}'".format(f))
+            continue
+        path_list.append(f)
+
+    return path_list
+
+
+def lint(paths, config, fix=None, **lintargs):
+    log = lintargs["log"]
+    paths = list(expand_exclusions(paths, config, lintargs["root"]))
+
+    # We ignored some specific files for a bunch of reasons.
+    # Not using excluding to avoid duplication
+    if lintargs.get("use_filters", True):
+        paths = remove_ignored_path(paths, lintargs["root"], log)
+
+    # An empty path array can occur when the user passes in `-n`. If we don't
+    # return early in this case, rustfmt will attempt to read stdin and hang.
+    if not paths:
+        return []
+
+    binary = get_clang_format_binary()
+
+    if not binary:
+        print(CLANG_FORMAT_NOT_FOUND)
+        if "MOZ_AUTOMATION" in os.environ:
+            return 1
+        return []
+
+    cmd_args = [binary]
+
+    base_command = cmd_args + ["--version"]
+    version = run_process(config, base_command)
+    log.debug("Version: {}".format(version))
+
+    if fix:
+        cmd_args.append("-i")
+    else:
+        cmd_args.append("--dry-run")
+    base_command = cmd_args + paths
+    log.debug("Command: {}".format(" ".join(cmd_args)))
+    output = run_process(config, base_command)
+    output_list = []
+
+    if len(output) % 3 != 0:
+        raise Exception(
+            "clang-format output should be a multiple of 3. Output: %s" % output
+        )
+
+    for i in range(0, len(output), 3):
+        # Merge the element 3 by 3 (clang-format output)
+        line = output[i]
+        line += ";" + output[i + 1]
+        line += ";" + output[i + 2]
+        output_list.append(line)
+
+    if fix:
+        # clang-format is able to fix all issues so don't bother parsing the output.
+        return []
+    return parse_issues(config, output_list, paths, log)
diff --git a/tools/lint/clippy.yml b/tools/lint/clippy.yml
new file mode 100644
index 0000000000..fa736265a4
--- /dev/null
+++ b/tools/lint/clippy.yml
@@ -0,0 +1,117 @@
+---
+clippy:
+    description: Lint rust
+    include:
+        - build/workspace-hack/
+        - dom/media/gtest/
+        - dom/webauthn/libudev-sys/
+        - gfx/webrender_bindings/
+        - gfx/wr/direct-composition/
+        - gfx/wr/example-compositor/compositor-windows/
+        - gfx/wr/peek-poke/
+        - gfx/wr/peek-poke/peek-poke-derive/
+        - gfx/wr/webrender_build/
+        - gfx/wr/wr_malloc_size_of/
+        - js/src/
+        - js/src/frontend/smoosh/
+        - js/src/rust/shared/
+        - js/src/wasm/cranelift/
+        - media/audioipc/
+        - modules/libpref/init/static_prefs/
+        - mozglue/static/rust/
+        - netwerk/base/mozurl/
+        - security/manager/ssl/osclientcerts/
+        - servo/components/derive_common/
+        - servo/components/selectors/
+        - servo/components/servo_arc/
+        - servo/components/size_of_test/
+        - servo/components/style/
+        - servo/components/style_derive/
+        - servo/components/style_traits/
+        - servo/components/to_shmem/
+        - servo/components/to_shmem_derive/
+        - servo/tests/unit/style/
+        - testing/geckodriver/
+        - testing/mozbase/rust/mozdevice/
+        - testing/mozbase/rust/mozprofile/
+        - testing/mozbase/rust/mozrunner/
+        - testing/mozbase/rust/mozversion/
+        - testing/webdriver/
+        - third_party/rust/mp4parse/
+        - third_party/rust/mp4parse_capi/
+        - toolkit/components/kvstore/
+        - toolkit/components/glean/
+        - toolkit/components/xulstore/tests/gtest/
+        - toolkit/library/rust/
+        - tools/fuzzing/rust/
+        - xpcom/rust/gtest/bench-collections/
+        - xpcom/rust/xpcom/xpcom_macros/
+    exclude:
+        # Many are failing for the same reasons:
+        # https://bugzilla.mozilla.org/show_bug.cgi?id=1606073
+        # https://bugzilla.mozilla.org/show_bug.cgi?id=1606077
+        - Cargo.toml
+        # nsstring
+        # derive_hash_xor_eq
+        - gfx/wr/
+        - gfx/wr/webrender/
+        - gfx/wr/examples/
+        - gfx/wr/webrender_api/
+        - gfx/wr/wrench/
+        - gfx/wgpu/wgpu-core/
+        - gfx/wgpu_bindings/
+        # not_unsafe_ptr_arg_deref
+        - modules/libpref/parser/
+        - tools/profiler/rust-helper/
+        - toolkit/library/rust/shared/
+        - toolkit/library/gtest/rust/
+        # not_unsafe_ptr_arg_deref
+        - remote/
+        - dom/media/webrtc/sdp/rsdparsa_capi/
+        - intl/encoding_glue/
+        # not_unsafe_ptr_arg_deref
+        - js/rust/
+        - storage/rust/
+        - storage/variant/
+        # nsstring
+        - toolkit/components/xulstore/
+        - servo/ports/geckolib/tests/
+        - xpcom/rust/xpcom/
+        - xpcom/rust/nsstring/
+        - xpcom/rust/gtest/xpcom/
+        - xpcom/rust/gtest/nsstring/
+        - security/manager/ssl/cert_storage/
+        - intl/locale/rust/fluent-langneg-ffi/
+        - intl/locale/rust/unic-langid-ffi/
+        - toolkit/components/places/bookmark_sync/
+        - xpcom/rust/nserror/
+        - xpcom/rust/moz_task/
+        - xpcom/rust/gkrust_utils/
+        - netwerk/socket/neqo_glue/
+        - dom/media/webrtc/transport/mdns_service/
+        - media/audioipc/client/
+        - media/audioipc/audioipc/
+        - media/audioipc/server/
+        - tools/lint/test/files/clippy/
+        - servo/components/hashglobe/
+        - servo/ports/geckolib/
+        - servo/ports/geckolib/tests/
+        - servo/tests/unit/malloc_size_of/
+        - servo/components/malloc_size_of/
+        - dom/media/webrtc/sdp/rsdparsa_capi/
+        - servo/components/fallible/
+        - testing/geckodriver/marionette/
+        - toolkit/components/bitsdownload/bits_client/
+        - gfx/wr/example-compositor/compositor/
+        - toolkit/components/bitsdownload/bits_client/bits/
+    extensions:
+        - rs
+    support-files:
+        - 'tools/lint/clippy/**'
+    # the version of clippy is:
+    # clippy 0.0.212 (d4092ac 2020-05-11)
+    # but 0.0.212 isn't updated. we use the date instead
+    # replacing - by . because Python StrictVersion expects this
+    min_clippy_version: 2020.05.11
+    type: external
+    payload: clippy:lint
diff --git a/tools/lint/clippy/__init__.py b/tools/lint/clippy/__init__.py
new file mode 100644
index 0000000000..75dbcd42fc
--- /dev/null
+++ b/tools/lint/clippy/__init__.py
@@ -0,0 +1,252 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import os
+import re
+import signal
+import six
+import subprocess
+
+from distutils.version import StrictVersion
+from mozfile import which
+from mozlint import result
+from mozlint.pathutils import get_ancestors_by_name
+from mozprocess import ProcessHandler
+
+
+CLIPPY_WRONG_VERSION = """
+You are probably using an old version of clippy.
+Expected version is {version}.
+
+To install it:
+    $ rustup component add clippy
+
+Or to update it:
+    $ rustup update
+
+And make sure that 'cargo' is in the PATH
+""".strip()
+
+
+CARGO_NOT_FOUND = """
+Could not find cargo! Install cargo.
+
+And make sure that it is in the PATH
+""".strip()
+
+
+def parse_issues(log, config, issues, path, onlyIn):
+    results = []
+    for issue in issues:
+
+        try:
+            detail = json.loads(six.ensure_text(issue))
+            if "message" in detail:
+                p = detail["target"]["src_path"]
+                detail = detail["message"]
+                if "level" in detail:
+                    if (
+                        detail["level"] == "error" or detail["level"] == "failure-note"
+                    ) and not detail["code"]:
+                        log.debug(
+                            "Error outside of clippy."
+                            "This means that the build failed. Therefore, skipping this"
+                        )
+                        log.debug("File = {} / Detail = {}".format(p, detail))
+                        continue
+                    # We are in a clippy warning
+                    if len(detail["spans"]) == 0:
+                        # For some reason, at the end of the summary, we can
+                        # get the following line
+                        # {'rendered': 'warning: 5 warnings emitted\n\n', 'children':
+                        # [], 'code': None, 'level': 'warning', 'message':
+                        # '5 warnings emitted', 'spans': []}
+                        # if this is the case, skip it
+                        log.debug(
+                            "Skipping the summary line {} for file {}".format(detail, p)
+                        )
+                        continue
+
+                    l = detail["spans"][0]
+                    if onlyIn and onlyIn not in p:
+                        # Case when we have a .rs in the include list in the yaml file
+                        log.debug(
+                            "{} is not part of the list of files '{}'".format(p, onlyIn)
+                        )
+                        continue
+                    res = {
+                        "path": p,
+                        "level": detail["level"],
+                        "lineno": l["line_start"],
+                        "column": l["column_start"],
+                        "message": detail["message"],
+                        "hint": detail["rendered"],
+                        "rule": detail["code"]["code"],
+                        "lineoffset": l["line_end"] - l["line_start"],
+                    }
+                    results.append(result.from_config(config, **res))
+
+        except json.decoder.JSONDecodeError:
+            log.debug("Could not parse the output:")
+            log.debug("clippy output: {}".format(issue))
+            continue
+
+    return results
+
+
+def get_cargo_binary(log):
+    """
+    Returns the path of the first rustfmt binary available
+    if not found returns None
+    """
+    cargo_home = os.environ.get("CARGO_HOME")
+    if cargo_home:
+        log.debug("Found CARGO_HOME in {}".format(cargo_home))
+        cargo_bin = os.path.join(cargo_home, "bin", "cargo")
+        if os.path.exists(cargo_bin):
+            return cargo_bin
+        log.debug("Did not find {} in CARGO_HOME".format(cargo_bin))
+        return None
+    return which("cargo")
+
+
+def get_clippy_version(log, binary):
+    """
+    Check if we are running the deprecated rustfmt
+    """
+    try:
+        output = subprocess.check_output(
+            [binary, "clippy", "--version"],
+            stderr=subprocess.STDOUT,
+            universal_newlines=True,
+        )
+    except subprocess.CalledProcessError:
+        # --version failed, clippy isn't installed.
+        return False
+
+    log.debug("Found version: {}".format(output))
+
+    version = re.findall(r"(\d+-\d+-\d+)", output)[0].replace("-", ".")
+    version = StrictVersion(version)
+    return version
+
+
+class clippyProcess(ProcessHandler):
+    def __init__(self, config, *args, **kwargs):
+        self.config = config
+        kwargs["stream"] = False
+        ProcessHandler.__init__(self, *args, **kwargs)
+
+    def run(self, *args, **kwargs):
+        orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+        ProcessHandler.run(self, *args, **kwargs)
+        signal.signal(signal.SIGINT, orig)
+
+
+def run_process(log, config, cmd):
+    log.debug("Command: {}".format(cmd))
+    proc = clippyProcess(config, cmd)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+    return proc.output
+
+
+def lint(paths, config, fix=None, **lintargs):
+    log = lintargs["log"]
+    cargo = get_cargo_binary(log)
+
+    if not cargo:
+        print(CARGO_NOT_FOUND)
+        if "MOZ_AUTOMATION" in os.environ:
+            return 1
+        return []
+
+    min_version_str = config.get("min_clippy_version")
+    min_version = StrictVersion(min_version_str)
+    actual_version = get_clippy_version(log, cargo)
+    log.debug(
+        "Found version: {}. Minimal expected version: {}".format(
+            actual_version, min_version
+        )
+    )
+
+    if actual_version < min_version:
+        print(CLIPPY_WRONG_VERSION.format(version=min_version_str))
+        return 1
+
+    cmd_args_clean = [cargo]
+    cmd_args_clean.append("clean")
+
+    cmd_args_common = ["--manifest-path"]
+    cmd_args_clippy = [cargo]
+
+    if fix:
+        cmd_args_clippy += ["+nightly"]
+
+    cmd_args_clippy += [
+        "clippy",
+        "--message-format=json",
+    ]
+
+    if fix:
+        cmd_args_clippy += ["--fix", "-Z", "unstable-options"]
+
+    lock_files_to_delete = []
+    for p in paths:
+        lock_file = os.path.join(p, "Cargo.lock")
+        if not os.path.exists(lock_file):
+            lock_files_to_delete.append(lock_file)
+
+    results = []
+    for p in paths:
+        # Quick sanity check of the paths
+        if p.endswith("Cargo.toml"):
+            print("Error: expects a directory or a rs file")
+            print("Found {}".format(p))
+            return 1
+
+    for p in paths:
+        onlyIn = []
+        path_conf = p
+        log.debug("Path = {}".format(p))
+        if os.path.isfile(p):
+            # We are dealing with a file. We remove the filename from the path
+            # to find the closest Cargo file
+            # We also store the name of the file to be able to filter out other
+            # files built by the cargo
+            p = os.path.dirname(p)
+            onlyIn = path_conf
+
+        if os.path.isdir(p):
+            # Sometimes, clippy reports issues from other crates
+            # Make sure that we don't display that either
+            onlyIn = p
+
+        cargo_files = get_ancestors_by_name("Cargo.toml", p, lintargs["root"])
+        p = cargo_files[0]
+
+        log.debug("Path translated to = {}".format(p))
+        # Needs clean because of https://github.com/rust-lang/rust-clippy/issues/2604
+        clean_command = cmd_args_clean + cmd_args_common + [p]
+        run_process(log, config, clean_command)
+
+        # Create the actual clippy command
+        base_command = cmd_args_clippy + cmd_args_common + [p]
+        output = run_process(log, config, base_command)
+
+        # Remove build artifacts created by clippy
+        run_process(log, config, clean_command)
+        results += parse_issues(log, config, output, p, onlyIn)
+
+    # Remove Cargo.lock files created by clippy
+    for lock_file in lock_files_to_delete:
+        if os.path.exists(lock_file):
+            os.remove(lock_file)
+
+    return sorted(results, key=lambda issue: issue.path)
diff --git a/tools/lint/codespell.yml b/tools/lint/codespell.yml
new file mode 100644
index 0000000000..f82c0759b6
--- /dev/null
+++ b/tools/lint/codespell.yml
@@ -0,0 +1,85 @@
+---
+codespell:
+    description: Check code for common misspellings
+    include:
+        - browser/base/content/docs/
+        - browser/branding/
+        - browser/components/newtab/docs/
+        - browser/components/newtab/content-src/asrouter/docs/
+        - browser/components/touchbar/docs/
+        - browser/components/urlbar/docs/
+        - browser/extensions/formautofill/locales/en-US/
+        - browser/extensions/report-site-issue/locales/en-US/
+        - browser/installer/windows/docs/
+        - browser/locales/en-US/
+        - build/docs/
+        - devtools/client/locales/en-US/
+        - devtools/docs/
+        - devtools/shared/locales/en-US/
+        - devtools/startup/locales/en-US/
+        - docs/
+        - dom/docs/
+        - dom/locales/en-US/
+        - gfx/docs/
+        - intl/docs/
+        - intl/locales/en-US/
+        - js/src/doc/
+        - layout/tools/layout-debug/ui/locale/en-US/
+        - mobile/android/branding/
+        - mobile/android/docs/
+        - mobile/android/locales/en-US/
+        - mobile/locales/en-US/
+        - netwerk/locales/en-US/
+        - python/docs/
+        - python/mach/docs/
+        - python/mozlint/
+        - remote/doc/
+        - security/manager/locales/en-US/
+        - services/sync/locales/en-US/
+        - taskcluster/docs/
+        - testing/geckodriver/doc/
+        - testing/marionette/doc/
+        - testing/mozbase/docs/
+        - toolkit/components/extensions/docs/
+        - toolkit/components/normandy/docs/
+        - toolkit/components/search/docs/
+        - toolkit/components/telemetry/docs/
+        - toolkit/crashreporter/docs/
+        - toolkit/docs/
+        - toolkit/locales/en-US/
+        - toolkit/modules/docs/
+        - tools/code-coverage/docs/
+        - tools/fuzzing/docs/
+        - tools/moztreedocs/
+        - tools/lint/
+        - tools/sanitizer/docs/
+        - tools/tryselect/
+        - uriloader/docs/
+    exclude:
+        - tools/lint/test/test_codespell.py
+    # List of extensions coming from:
+    # tools/lint/{flake8,eslint}.yml
+    # tools/mach_commands.py (clang-format)
+    # + documentation
+    # + localization files
+    extensions:
+        - js
+        - jsm
+        - jxs
+        - xml
+        - html
+        - xhtml
+        - cpp
+        - c
+        - h
+        - configure
+        - py
+        - properties
+        - rst
+        - md
+        - ftl
+    support-files:
+        - 'tools/lint/spell/**'
+    type: external
+    setup: spell:setup
+    payload: spell:lint
diff --git a/tools/lint/cpp-virtual-final.yml b/tools/lint/cpp-virtual-final.yml
new file mode 100644
index 0000000000..20c5837f36
--- /dev/null
+++ b/tools/lint/cpp-virtual-final.yml
@@ -0,0 +1,25 @@
+---
+cpp-virtual-final:
+    description: "Virtual function declarations should specify only one of
+                  `virtual`, `final`, or `override`"
+    level: error
+    include: ['.']
+    extensions: ['cc', 'cpp', 'h', 'mm']
+    type: regex
+    #
+    # This lint warns about:
+    #
+    #   virtual void Bad1() final
+    #   void Bad2() final override
+    #   void Bad3() override final
+    #
+    # Caveats: This lint ...
+    #
+    #   * Doesn't warn about `virtual void NotBad() override` at this time
+    #     because there are currently 6963 instances of this pattern.
+    #
+    #   * Doesn't warn about function declarations that span multiple lines
+    #     because the regex can't match across line breaks.
+    #
+    #           virtual    )    final  |  final  override  |  override  final
+    payload: ^ *virtual .+\).+\bfinal\b|\bfinal +override\b|\boverride +final\b
diff --git a/tools/lint/cpp/__init__.py b/tools/lint/cpp/__init__.py
new file mode 100644
index 0000000000..c580d191c1
--- /dev/null
+++ b/tools/lint/cpp/__init__.py
@@ -0,0 +1,3 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
diff --git a/tools/lint/cpp/mingw-capitalization.py b/tools/lint/cpp/mingw-capitalization.py
new file mode 100644
index 0000000000..b5a4b07c6a
--- /dev/null
+++ b/tools/lint/cpp/mingw-capitalization.py
@@ -0,0 +1,37 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import re
+
+from mozlint.types import LineType
+
+here = os.path.abspath(os.path.dirname(__file__))
+HEADERS_FILE = os.path.join(here, "mingw-headers.txt")
+# generated by cd mingw-w64/mingw-w64-headers &&
+#  find . -name "*.h" | xargs -I bob -- basename bob | sort | uniq)
+
+
+class MinGWCapitalization(LineType):
+    def __init__(self, *args, **kwargs):
+        super(MinGWCapitalization, self).__init__(*args, **kwargs)
+        with open(HEADERS_FILE, "r") as fh:
+            self.headers = fh.read().strip().splitlines()
+        self.regex = re.compile("^#include\s*<(" + "|".join(self.headers) + ")>")
+
+    def condition(self, payload, line, config):
+        if not line.startswith("#include"):
+            return False
+
+        if self.regex.search(line, re.I):
+            return not self.regex.search(line)
+
+
+def lint(paths, config, **lintargs):
+    results = []
+
+    m = MinGWCapitalization()
+    for path in paths:
+        results.extend(m._lint(path, config, **lintargs))
+    return results
diff --git a/tools/lint/cpp/mingw-headers.txt b/tools/lint/cpp/mingw-headers.txt
new file mode 100755
index 0000000000..5ee737c393
--- /dev/null
+++ b/tools/lint/cpp/mingw-headers.txt
@@ -0,0 +1,1452 @@
+accctrl.h
+aclapi.h
+aclui.h
+acpiioct.h
+activation.h
+activaut.h
+activdbg100.h
+activdbg.h
+activecf.h
+activeds.h
+activprof.h
+activscp.h
+adc.h
+adhoc.h
+admex.h
+adoctint.h
+adodef.h
+adogpool_backcompat.h
+adogpool.h
+adoguids.h
+adoid.h
+adoint_backcompat.h
+adoint.h
+adojet.h
+adomd.h
+adptif.h
+adsdb.h
+adserr.h
+adshlp.h
+adsiid.h
+adsnms.h
+adsprop.h
+adssts.h
+adtgen.h
+advpub.h
+afilter.h
+af_irda.h
+afxres.h
+agtctl.h
+agterr.h
+agtsvr.h
+alg.h
+alink.h
+amaudio.h
+amstream.h
+amtvuids.h
+amvideo.h
+apdevpkey.h
+apisetcconv.h
+apiset.h
+appmgmt.h
+aqadmtyp.h
+asptlb.h
+assert.h
+atacct.h
+atalkwsh.h
+atm.h
+atsmedia.h
+audevcod.h
+audioapotypes.h
+audioclient.h
+audioendpoints.h
+audioengineendpoint.h
+audiopolicy.h
+audiosessiontypes.h
+austream.h
+authif.h
+authz.h
+aux_ulib.h
+avifmt.h
+aviriff.h
+avrfsdk.h
+avrt.h
+axextendenums.h
+azroles.h
+basetsd.h
+basetyps.h
+batclass.h
+bcrypt.h
+bdaiface_enums.h
+bdaiface.h
+bdamedia.h
+bdasup.h
+bdatypes.h
+bemapiset.h
+bh.h
+bidispl.h
+bits1_5.h
+bits2_0.h
+bitscfg.h
+bits.h
+bitsmsg.h
+blberr.h
+bluetoothapis.h
+_bsd_types.h
+bthdef.h
+bthsdpdef.h
+bugcodes.h
+callobj.h
+cardmod.h
+casetup.h
+cchannel.h
+cdefs.h
+cderr.h
+cdoexerr.h
+cdoex.h
+cdoexm.h
+cdoexstr.h
+cdonts.h
+cdosyserr.h
+cdosys.h
+cdosysstr.h
+celib.h
+certadm.h
+certbase.h
+certbcli.h
+certcli.h
+certenc.h
+certenroll.h
+certexit.h
+certif.h
+certmod.h
+certpol.h
+certreqd.h
+certsrv.h
+certview.h
+cfg.h
+cfgmgr32.h
+cguid.h
+chanmgr.h
+cierror.h
+classpnp.h
+clfs.h
+clfsmgmt.h
+clfsmgmtw32.h
+clfsw32.h
+client.h
+cluadmex.h
+clusapi.h
+cluscfgguids.h
+cluscfgserver.h
+cluscfgwizard.h
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+tapi.h
+taskschd.h
+tbs.h
+tcerror.h
+tcguid.h
+tchar.h
+tchar_s.h
+tcpestats.h
+tcpmib.h
+tdh.h
+tdi.h
+tdiinfo.h
+tdikrnl.h
+tdistat.h
+termmgr.h
+textserv.h
+textstor.h
+threadpoolapiset.h
+threadpoollegacyapiset.h
+timeb.h
+timeb_s.h
+time.h
+timeprov.h
+_timeval.h
+timezoneapi.h
+tlbref.h
+tlhelp32.h
+tlogstg.h
+tmschema.h
+tnef.h
+tom.h
+tpcshrd.h
+traffic.h
+transact.h
+triedcid.h
+triediid.h
+triedit.h
+tsattrs.h
+tspi.h
+tssbx.h
+tsuserex.h
+tuner.h
+tvout.h
+txcoord.h
+txctx.h
+txdtc.h
+txfw32.h
+typeinfo.h
+types.h
+uastrfnc.h
+uchar.h
+udpmib.h
+uianimation.h
+uiautomationclient.h
+uiautomationcoreapi.h
+uiautomationcore.h
+uiautomation.h
+uiviewsettingsinterop.h
+umx.h
+unistd.h
+unknown.h
+unknwnbase.h
+unknwn.h
+upssvc.h
+urlhist.h
+urlmon.h
+usb100.h
+usb200.h
+usbbusif.h
+usbcamdi.h
+usbdi.h
+usbdlib.h
+usbdrivr.h
+usb.h
+usbioctl.h
+usbiodef.h
+usbkern.h
+usbprint.h
+usbprotocoldefs.h
+usbrpmif.h
+usbscan.h
+usbspec.h
+usbstorioctl.h
+usbuser.h
+userenv.h
+usp10.h
+utilapiset.h
+utime.h
+uuids.h
+uxtheme.h
+vadefs.h
+varargs.h
+_varenum.h
+vcr.h
+vdmdbg.h
+vds.h
+vdslun.h
+versionhelpers.h
+vfw.h
+vfwmsgs.h
+videoagp.h
+video.h
+virtdisk.h
+vmr9.h
+vsadmin.h
+vsbackup.h
+vsmgmt.h
+vsprov.h
+vss.h
+vsstyle.h
+vssym32.h
+vswriter.h
+w32api.h
+wabapi.h
+wabcode.h
+wabdefs.h
+wab.h
+wabiab.h
+wabmem.h
+wabnot.h
+wabtags.h
+wabutil.h
+wbemads.h
+wbemcli.h
+wbemdisp.h
+wbemidl.h
+wbemprov.h
+wbemtran.h
+wchar.h
+wchar_s.h
+wcmconfig.h
+wcsplugin.h
+wct.h
+wctype.h
+wdmguid.h
+wdm.h
+wdsbp.h
+wdsclientapi.h
+wdspxe.h
+wdstci.h
+wdstpdi.h
+wdstptmgmt.h
+werapi.h
+wfext.h
+wglext.h
+wiadef.h
+wiadevd.h
+wia.h
+wiavideo.h
+winable.h
+winapifamily.h
+winbase.h
+winber.h
+wincodec.h
+wincon.h
+wincred.h
+wincrypt.h
+winddi.h
+winddiui.h
+windef.h
+windns.h
+windot11.h
+windows.foundation.h
+windows.h
+windows.security.cryptography.h
+windows.storage.h
+windows.storage.streams.h
+windows.system.threading.h
+windowsx.h
+winefs.h
+winerror.h
+winevt.h
+wingdi.h
+winhttp.h
+wininet.h
+winineti.h
+winioctl.h
+winldap.h
+winnetwk.h
+winnls32.h
+winnls.h
+winnt.h
+winperf.h
+winreg.h
+winresrc.h
+winsafer.h
+winsatcominterfacei.h
+winscard.h
+winsdkver.h
+winsmcrd.h
+winsnmp.h
+winsock2.h
+winsock.h
+winsplp.h
+winspool.h
+winstring.h
+winsvc.h
+winsxs.h
+winsync.h
+winternl.h
+wintrust.h
+winusb.h
+winusbio.h
+winuser.h
+winver.h
+winwlx.h
+wlanapi.h
+wlanihvtypes.h
+wlantypes.h
+wmcodecdsp.h
+wmcontainer.h
+wmdrmsdk.h
+wmiatlprov.h
+wmidata.h
+wmilib.h
+wmistr.h
+wmiutils.h
+wmsbuffer.h
+wmsdkidl.h
+wnnc.h
+wow64apiset.h
+wownt16.h
+wownt32.h
+wpapi.h
+wpapimsg.h
+wpcapi.h
+wpcevent.h
+wpcrsmsg.h
+wpftpmsg.h
+wppstmsg.h
+wpspihlp.h
+wptypes.h
+wpwizmsg.h
+wrl.h
+_ws1_undef.h
+ws2atm.h
+ws2bth.h
+ws2def.h
+ws2dnet.h
+ws2ipdef.h
+ws2san.h
+ws2spi.h
+ws2tcpip.h
+_wsadata.h
+_wsa_errnos.h
+wsdapi.h
+wsdattachment.h
+wsdbase.h
+wsdclient.h
+wsddisco.h
+wsdhost.h
+wsdtypes.h
+wsdutil.h
+wsdxmldom.h
+wsdxml.h
+wshisotp.h
+wsipv6ok.h
+wsipx.h
+wsmandisp.h
+wsman.h
+wsnetbs.h
+wsnwlink.h
+wspiapi.h
+wsrm.h
+wsvns.h
+wtsapi32.h
+wtypesbase.h
+wtypes.h
+xa.h
+xcmcext.h
+xcmc.h
+xcmcmsx2.h
+xcmcmsxt.h
+xenroll.h
+xfilter.h
+xinput.h
+xlocinfo.h
+xmath.h
+_xmitfile.h
+xmldomdid.h
+xmldsodid.h
+xmllite.h
+xmltrnsf.h
+xolehlp.h
+xpsdigitalsignature.h
+xpsobjectmodel_1.h
+xpsobjectmodel.h
+xpsprint.h
+xpsrassvc.h
+ymath.h
+yvals.h
+zmouse.h
diff --git a/tools/lint/eslint.yml b/tools/lint/eslint.yml
new file mode 100644
index 0000000000..627cd1a658
--- /dev/null
+++ b/tools/lint/eslint.yml
@@ -0,0 +1,30 @@
+---
+eslint:
+    description: JavaScript linter
+    # ESLint infra handles its own path filtering, so just include cwd
+    include: ['.']
+    exclude: []
+    extensions: ['js', 'jsm', 'jsx', 'xul', 'html', 'xhtml']
+    support-files:
+        - '**/.eslintrc.js'
+        - '.eslintignore'
+        - 'tools/lint/eslint/**'
+        # Files that can influence global variables
+        - 'browser/base/content/nsContextMenu.js'
+        - 'browser/base/content/utilityOverlay.js'
+        - 'browser/components/customizableui/content/panelUI.js'
+        - 'browser/components/downloads/content/downloads.js'
+        - 'browser/components/downloads/content/indicator.js'
+        - 'testing/mochitest/tests/SimpleTest/EventUtils.js'
+        - 'testing/mochitest/tests/SimpleTest/MockObjects.js'
+        - 'testing/mochitest/tests/SimpleTest/SimpleTest.js'
+        - 'testing/mochitest/tests/SimpleTest/WindowSnapshot.js'
+        - 'toolkit/components/printing/content/printUtils.js'
+        - 'toolkit/components/viewsource/content/viewSourceUtils.js'
+        - 'toolkit/content/contentAreaUtils.js'
+        - 'toolkit/content/editMenuOverlay.js'
+        - 'toolkit/content/globalOverlay.js'
+        - 'toolkit/modules/Services.jsm'
+    type: external
+    payload: eslint:lint
+    setup: eslint:setup
diff --git a/tools/lint/eslint/.eslintrc.js b/tools/lint/eslint/.eslintrc.js
new file mode 100644
index 0000000000..48285a03d0
--- /dev/null
+++ b/tools/lint/eslint/.eslintrc.js
@@ -0,0 +1,27 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+module.exports = {
+  // eslint-plugin-mozilla runs under node, so we need a more restrictive
+  // environment / parser setup here than the rest of mozilla-central.
+  env: {
+    browser: false,
+    node: true,
+  },
+  parser: "espree",
+  parserOptions: {
+    ecmaVersion: 10,
+  },
+
+  rules: {
+    camelcase: ["error", { properties: "never" }],
+    "handle-callback-err": ["error", "er"],
+    "no-shadow": "error",
+    "no-undef-init": "error",
+    "one-var": ["error", "never"],
+    strict: ["error", "global"],
+  },
+};
diff --git a/tools/lint/eslint/__init__.py b/tools/lint/eslint/__init__.py
new file mode 100644
index 0000000000..cf1b29e64a
--- /dev/null
+++ b/tools/lint/eslint/__init__.py
@@ -0,0 +1,144 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import absolute_import, print_function
+
+import json
+import os
+import signal
+import subprocess
+import sys
+
+sys.path.append(os.path.join(os.path.dirname(__file__), "eslint"))
+from eslint import setup_helper
+
+from mozbuild.nodeutil import find_node_executable
+
+from mozlint import result
+
+ESLINT_ERROR_MESSAGE = """
+An error occurred running eslint. Please check the following error messages:
+
+{}
+""".strip()
+
+ESLINT_NOT_FOUND_MESSAGE = """
+Could not find eslint!  We looked at the --binary option, at the ESLINT
+environment variable, and then at your local node_modules path. Please Install
+eslint and needed plugins with:
+
+mach eslint --setup
+
+and try again.
+""".strip()
+
+
+def setup(root, **lintargs):
+    setup_helper.set_project_root(root)
+
+    if not setup_helper.check_node_executables_valid():
+        return 1
+
+    return setup_helper.eslint_maybe_setup()
+
+
+def lint(paths, config, binary=None, fix=None, setup=None, **lintargs):
+    """Run eslint."""
+    log = lintargs["log"]
+    setup_helper.set_project_root(lintargs["root"])
+    module_path = setup_helper.get_project_root()
+
+    # Valid binaries are:
+    #  - Any provided by the binary argument.
+    #  - Any pointed at by the ESLINT environmental variable.
+    #  - Those provided by |mach lint --setup|.
+
+    if not binary:
+        binary, _ = find_node_executable()
+
+    if not binary:
+        print(ESLINT_NOT_FOUND_MESSAGE)
+        return 1
+
+    extra_args = lintargs.get("extra_args") or []
+    exclude_args = []
+    for path in config.get("exclude", []):
+        exclude_args.extend(
+            ["--ignore-pattern", os.path.relpath(path, lintargs["root"])]
+        )
+
+    cmd_args = (
+        [
+            binary,
+            os.path.join(module_path, "node_modules", "eslint", "bin", "eslint.js"),
+            # This keeps ext as a single argument.
+            "--ext",
+            "[{}]".format(",".join(config["extensions"])),
+            "--format",
+            "json",
+            "--no-error-on-unmatched-pattern",
+        ]
+        + extra_args
+        + exclude_args
+        + paths
+    )
+    log.debug("Command: {}".format(" ".join(cmd_args)))
+
+    # eslint requires that --fix be set before the --ext argument.
+    if fix:
+        cmd_args.insert(2, "--fix")
+
+    shell = False
+    if os.environ.get("MSYSTEM") in ("MINGW32", "MINGW64"):
+        # The eslint binary needs to be run from a shell with msys
+        shell = True
+    encoding = "utf-8"
+
+    orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+    proc = subprocess.Popen(
+        cmd_args, shell=shell, stdout=subprocess.PIPE, stderr=subprocess.PIPE
+    )
+    signal.signal(signal.SIGINT, orig)
+
+    try:
+        output, errors = proc.communicate()
+    except KeyboardInterrupt:
+        proc.kill()
+        return []
+
+    if errors:
+        errors = errors.decode(encoding, "replace")
+        print(ESLINT_ERROR_MESSAGE.format(errors))
+
+    if proc.returncode >= 2:
+        return 1
+
+    if not output:
+        return []  # no output means success
+    output = output.decode(encoding, "replace")
+    try:
+        jsonresult = json.loads(output)
+    except ValueError:
+        print(ESLINT_ERROR_MESSAGE.format(output))
+        return 1
+
+    results = []
+    for obj in jsonresult:
+        errors = obj["messages"]
+
+        for err in errors:
+            err.update(
+                {
+                    "hint": err.get("fix"),
+                    "level": "error" if err["severity"] == 2 else "warning",
+                    "lineno": err.get("line") or 0,
+                    "path": obj["filePath"],
+                    "rule": err.get("ruleId"),
+                }
+            )
+            results.append(result.from_config(config, **err))
+
+    return results
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",
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+      "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",
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+      "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",
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+      "requires": {
+        "@babel/types": "^7.10.4"
+      }
+    },
+    "@babel/helper-split-export-declaration": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.10.4.tgz",
+      "integrity": "sha512-pySBTeoUff56fL5CBU2hWm9TesA4r/rOkI9DyJLvvgz09MB9YtfIYe3iBriVaYNaPe+Alua0vBIOVOLs2buWhg==",
+      "requires": {
+        "@babel/types": "^7.10.4"
+      }
+    },
+    "@babel/helper-validator-identifier": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz",
+      "integrity": "sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw=="
+    },
+    "@babel/helpers": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.10.4.tgz",
+      "integrity": "sha512-L2gX/XeUONeEbI78dXSrJzGdz4GQ+ZTA/aazfUsFaWjSe95kiCuOZ5HsXvkiw3iwF+mFHSRUfJU8t6YavocdXA==",
+      "requires": {
+        "@babel/template": "^7.10.4",
+        "@babel/traverse": "^7.10.4",
+        "@babel/types": "^7.10.4"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
+      "integrity": "sha512-i6rgnR/YgPEQzZZnbTHHuZdlE8qyoBNalD6F+q4vAFlcMEcqmkoG+mPqJYJCo63qPf74+Y1UZsl3l6f7/RIkmA==",
+      "requires": {
+        "@babel/helper-validator-identifier": "^7.10.4",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "@babel/parser": {
+      "version": "7.10.5",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.10.5.tgz",
+      "integrity": "sha512-wfryxy4bE1UivvQKSQDU4/X6dr+i8bctjUjj8Zyt3DQy7NtPizJXT8M52nqpNKL+nq2PW8lxk4ZqLj0fD4B4hQ=="
+    },
+    "@babel/template": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.10.4.tgz",
+      "integrity": "sha512-ZCjD27cGJFUB6nmCB1Enki3r+L5kJveX9pq1SvAUKoICy6CZ9yD8xO086YXdYhvNjBdnekm4ZnaP5yC8Cs/1tA==",
+      "requires": {
+        "@babel/code-frame": "^7.10.4",
+        "@babel/parser": "^7.10.4",
+        "@babel/types": "^7.10.4"
+      }
+    },
+    "@babel/traverse": {
+      "version": "7.10.5",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.10.5.tgz",
+      "integrity": "sha512-yc/fyv2gUjPqzTz0WHeRJH2pv7jA9kA7mBX2tXl/x5iOE81uaVPuGPtaYk7wmkx4b67mQ7NqI8rmT2pF47KYKQ==",
+      "requires": {
+        "@babel/code-frame": "^7.10.4",
+        "@babel/generator": "^7.10.5",
+        "@babel/helper-function-name": "^7.10.4",
+        "@babel/helper-split-export-declaration": "^7.10.4",
+        "@babel/parser": "^7.10.5",
+        "@babel/types": "^7.10.5",
+        "debug": "^4.1.0",
+        "globals": "^11.1.0",
+        "lodash": "^4.17.19"
+      }
+    },
+    "@babel/types": {
+      "version": "7.10.5",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.10.5.tgz",
+      "integrity": "sha512-ixV66KWfCI6GKoA/2H9v6bQdbfXEwwpOdQ8cRvb4F+eyvhlaHxWFMQB4+3d9QFJXZsiiiqVrewNV0DFEQpyT4Q==",
+      "requires": {
+        "@babel/helper-validator-identifier": "^7.10.4",
+        "lodash": "^4.17.19",
+        "to-fast-properties": "^2.0.0"
+      }
+    },
+    "@eslint/eslintrc": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.1.3.tgz",
+      "integrity": "sha512-4YVwPkANLeNtRjMekzux1ci8hIaH5eGKktGqR0d3LWsKNn5B2X/1Z6Trxy7jQXl9EBGE6Yj02O+t09FMeRllaA==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.12.4",
+        "debug": "^4.1.1",
+        "espree": "^7.3.0",
+        "globals": "^12.1.0",
+        "ignore": "^4.0.6",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^3.13.1",
+        "lodash": "^4.17.19",
+        "minimatch": "^3.0.4",
+        "strip-json-comments": "^3.1.1"
+      },
+      "dependencies": {
+        "globals": {
+          "version": "12.4.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-12.4.0.tgz",
+          "integrity": "sha512-BWICuzzDvDoH54NHKCseDanAhE3CeDorgDL5MT6LMXXj2WCnd9UC2szdk4AWLfjdgNBCXLUanXYcpBBKOSWGwg==",
+          "dev": true,
+          "requires": {
+            "type-fest": "^0.8.1"
+          }
+        }
+      }
+    },
+    "@types/color-name": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
+      "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
+      "dev": true
+    },
+    "acorn": {
+      "version": "7.4.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.0.tgz",
+      "integrity": "sha512-+G7P8jJmCHr+S+cLfQxygbWhXy+8YTVGzAkpEbcLo2mLoL7tij/VG41QSHACSf5QgYRhMZYHuNc6drJaO0Da+w==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.1.tgz",
+      "integrity": "sha512-K0Ptm/47OKfQRpNQ2J/oIN/3QYiK6FwW+eJbILhsdxh2WTLdl+30o8aGdTbm5JbffpFFAg/g+zi1E+jvJha5ng==",
+      "dev": true
+    },
+    "ajv": {
+      "version": "6.12.5",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.5.tgz",
+      "integrity": "sha512-lRF8RORchjpKG50/WFf8xmg7sgCLFiYNNnqdKflk63whMQcWR5ngGjiSXkL9bjxy6B2npOK2HSMN49jEBMSkag==",
+      "dev": true,
+      "requires": {
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      }
+    },
+    "ansi-colors": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
+      "integrity": "sha512-JoX0apGbHaUJBNl6yF+p6JAFYZ666/hhCGKN5t9QFjbJQKUU/g8MNbFDbvfrgKXvI1QpZplPOnwIo99lX/AAmA==",
+      "dev": true
+    },
+    "ansi-regex": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
+      "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
+      "dev": true
+    },
+    "ansi-styles": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "requires": {
+        "color-convert": "^1.9.0"
+      }
+    },
+    "anymatch": {
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+      }
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+      "dev": true
+    },
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+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
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+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^3.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^13.1.2"
+      },
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+          "dev": true,
+          "requires": {
+            "locate-path": "^3.0.0"
+          }
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+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
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+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
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+          "dev": true,
+          "requires": {
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+          }
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+          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
+          "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
+          "dev": true
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "13.1.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+      "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
+    },
+    "yargs-unparser": {
+      "version": "1.6.1",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.1.tgz",
+      "integrity": "sha512-qZV14lK9MWsGCmcr7u5oXGH0dbGqZAIxTDrWXZDo5zUr6b6iUmelNKO6x6R1dQT24AH3LgRxJpr8meWy2unolA==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.3.1",
+        "decamelize": "^1.2.0",
+        "flat": "^4.1.0",
+        "is-plain-obj": "^1.1.0",
+        "yargs": "^14.2.3"
+      },
+      "dependencies": {
+        "find-up": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^3.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
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+          "dev": true,
+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "p-limit": {
+          "version": "2.3.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+          "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
+          "dev": true,
+          "requires": {
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+          }
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+        "p-locate": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.0.0"
+          }
+        },
+        "path-exists": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
+          "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
+          "dev": true
+        },
+        "yargs": {
+          "version": "14.2.3",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-14.2.3.tgz",
+          "integrity": "sha512-ZbotRWhF+lkjijC/VhmOT9wSgyBQ7+zr13+YLkhfsSiTriYsMzkTUFP18pFhWwBeMa5gUc1MzbhrO6/VB7c9Xg==",
+          "dev": true,
+          "requires": {
+            "cliui": "^5.0.0",
+            "decamelize": "^1.2.0",
+            "find-up": "^3.0.0",
+            "get-caller-file": "^2.0.1",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^2.0.0",
+            "set-blocking": "^2.0.0",
+            "string-width": "^3.0.0",
+            "which-module": "^2.0.0",
+            "y18n": "^4.0.0",
+            "yargs-parser": "^15.0.1"
+          }
+        },
+        "yargs-parser": {
+          "version": "15.0.1",
+          "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."
diff --git a/tools/lint/eslint/eslint-plugin-spidermonkey-js/LICENSE b/tools/lint/eslint/eslint-plugin-spidermonkey-js/LICENSE
new file mode 100644
index 0000000000..e87a115e46
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-spidermonkey-js/LICENSE
@@ -0,0 +1,363 @@
+Mozilla Public License, version 2.0
+
+1. Definitions
+
+1.1. "Contributor"
+
+     means each individual or legal entity that creates, contributes to the
+     creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+
+     means the combination of the Contributions of others (if any) used by a
+     Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+
+     means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+
+     means Source Code Form to which the initial Contributor has attached the
+     notice in Exhibit A, the Executable Form of such Source Code Form, and
+     Modifications of such Source Code Form, in each case including portions
+     thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+     means
+
+     a. that the initial Contributor has attached the notice described in
+        Exhibit B to the Covered Software; or
+
+     b. that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the terms of
+        a Secondary License.
+
+1.6. "Executable Form"
+
+     means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+
+     means a work that combines Covered Software with other material, in a
+     separate file or files, that is not Covered Software.
+
+1.8. "License"
+
+     means this document.
+
+1.9. "Licensable"
+
+     means having the right to grant, to the maximum extent possible, whether
+     at the time of the initial grant or subsequently, any and all of the
+     rights conveyed by this License.
+
+1.10. "Modifications"
+
+     means any of the following:
+
+     a. any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered Software; or
+
+     b. any new file in Source Code Form that contains any Covered Software.
+
+1.11. "Patent Claims" of a Contributor
+
+      means any patent claim(s), including without limitation, method,
+      process, and apparatus claims, in any patent Licensable by such
+      Contributor that would be infringed, but for the grant of the License,
+      by the making, using, selling, offering for sale, having made, import,
+      or transfer of either its Contributions or its Contributor Version.
+
+1.12. "Secondary License"
+
+      means either the GNU General Public License, Version 2.0, the GNU Lesser
+      General Public License, Version 2.1, the GNU Affero General Public
+      License, Version 3.0, or any later versions of those licenses.
+
+1.13. "Source Code Form"
+
+      means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+
+      means an individual or a legal entity exercising rights under this
+      License. For legal entities, "You" includes any entity that controls, is
+      controlled by, or is under common control with You. For purposes of this
+      definition, "control" means (a) the power, direct or indirect, to cause
+      the direction or management of such entity, whether by contract or
+      otherwise, or (b) ownership of more than fifty percent (50%) of the
+      outstanding shares or beneficial ownership of such entity.
+
+
+2. License Grants and Conditions
+
+2.1. Grants
+
+     Each Contributor hereby grants You a world-wide, royalty-free,
+     non-exclusive license:
+
+     a. under intellectual property rights (other than patent or trademark)
+        Licensable by such Contributor to use, reproduce, make available,
+        modify, display, perform, distribute, and otherwise exploit its
+        Contributions, either on an unmodified basis, with Modifications, or
+        as part of a Larger Work; and
+
+     b. under Patent Claims of such Contributor to make, use, sell, offer for
+        sale, have made, import, and otherwise transfer either its
+        Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+     The licenses granted in Section 2.1 with respect to any Contribution
+     become effective for each Contribution on the date the Contributor first
+     distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+     The licenses granted in this Section 2 are the only rights granted under
+     this License. No additional rights or licenses will be implied from the
+     distribution or licensing of Covered Software under this License.
+     Notwithstanding Section 2.1(b) above, no patent license is granted by a
+     Contributor:
+
+     a. for any code that a Contributor has removed from Covered Software; or
+
+     b. for infringements caused by: (i) Your and any other third party's
+        modifications of Covered Software, or (ii) the combination of its
+        Contributions with other software (except as part of its Contributor
+        Version); or
+
+     c. under Patent Claims infringed by Covered Software in the absence of
+        its Contributions.
+
+     This License does not grant any rights in the trademarks, service marks,
+     or logos of any Contributor (except as may be necessary to comply with
+     the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+     No Contributor makes additional grants as a result of Your choice to
+     distribute the Covered Software under a subsequent version of this
+     License (see Section 10.2) or under the terms of a Secondary License (if
+     permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+     Each Contributor represents that the Contributor believes its
+     Contributions are its original creation(s) or it has sufficient rights to
+     grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+     This License is not intended to limit any rights You have under
+     applicable copyright doctrines of fair use, fair dealing, or other
+     equivalents.
+
+2.7. Conditions
+
+     Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
+     Section 2.1.
+
+
+3. Responsibilities
+
+3.1. Distribution of Source Form
+
+     All distribution of Covered Software in Source Code Form, including any
+     Modifications that You create or to which You contribute, must be under
+     the terms of this License. You must inform recipients that the Source
+     Code Form of the Covered Software is governed by the terms of this
+     License, and how they can obtain a copy of this License. You may not
+     attempt to alter or restrict the recipients' rights in the Source Code
+     Form.
+
+3.2. Distribution of Executable Form
+
+     If You distribute Covered Software in Executable Form then:
+
+     a. such Covered Software must also be made available in Source Code Form,
+        as described in Section 3.1, and You must inform recipients of the
+        Executable Form how they can obtain a copy of such Source Code Form by
+        reasonable means in a timely manner, at a charge no more than the cost
+        of distribution to the recipient; and
+
+     b. You may distribute such Executable Form under the terms of this
+        License, or sublicense it under different terms, provided that the
+        license for the Executable Form does not attempt to limit or alter the
+        recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+     You may create and distribute a Larger Work under terms of Your choice,
+     provided that You also comply with the requirements of this License for
+     the Covered Software. If the Larger Work is a combination of Covered
+     Software with a work governed by one or more Secondary Licenses, and the
+     Covered Software is not Incompatible With Secondary Licenses, this
+     License permits You to additionally distribute such Covered Software
+     under the terms of such Secondary License(s), so that the recipient of
+     the Larger Work may, at their option, further distribute the Covered
+     Software under the terms of either this License or such Secondary
+     License(s).
+
+3.4. Notices
+
+     You may not remove or alter the substance of any license notices
+     (including copyright notices, patent notices, disclaimers of warranty, or
+     limitations of liability) contained within the Source Code Form of the
+     Covered Software, except that You may alter any license notices to the
+     extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+     You may choose to offer, and to charge a fee for, warranty, support,
+     indemnity or liability obligations to one or more recipients of Covered
+     Software. However, You may do so only on Your own behalf, and not on
+     behalf of any Contributor. You must make it absolutely clear that any
+     such warranty, support, indemnity, or liability obligation is offered by
+     You alone, and You hereby agree to indemnify every Contributor for any
+     liability incurred by such Contributor as a result of warranty, support,
+     indemnity or liability terms You offer. You may include additional
+     disclaimers of warranty and limitations of liability specific to any
+     jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+
+   If it is impossible for You to comply with any of the terms of this License
+   with respect to some or all of the Covered Software due to statute,
+   judicial order, or regulation then You must: (a) comply with the terms of
+   this License to the maximum extent possible; and (b) describe the
+   limitations and the code they affect. Such description must be placed in a
+   text file included with all distributions of the Covered Software under
+   this License. Except to the extent prohibited by statute or regulation,
+   such description must be sufficiently detailed for a recipient of ordinary
+   skill to be able to understand it.
+
+5. Termination
+
+5.1. The rights granted under this License will terminate automatically if You
+     fail to comply with any of its terms. However, if You become compliant,
+     then the rights granted under this License from a particular Contributor
+     are reinstated (a) provisionally, unless and until such Contributor
+     explicitly and finally terminates Your grants, and (b) on an ongoing
+     basis, if such Contributor fails to notify You of the non-compliance by
+     some reasonable means prior to 60 days after You have come back into
+     compliance. Moreover, Your grants from a particular Contributor are
+     reinstated on an ongoing basis if such Contributor notifies You of the
+     non-compliance by some reasonable means, this is the first time You have
+     received notice of non-compliance with this License from such
+     Contributor, and You become compliant prior to 30 days after Your receipt
+     of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+     infringement claim (excluding declaratory judgment actions,
+     counter-claims, and cross-claims) alleging that a Contributor Version
+     directly or indirectly infringes any patent, then the rights granted to
+     You by any and all Contributors for the Covered Software under Section
+     2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
+     license agreements (excluding distributors and resellers) which have been
+     validly granted by You or Your distributors under this License prior to
+     termination shall survive termination.
+
+6. Disclaimer of Warranty
+
+   Covered Software is provided under this License on an "as is" basis,
+   without warranty of any kind, either expressed, implied, or statutory,
+   including, without limitation, warranties that the Covered Software is free
+   of defects, merchantable, fit for a particular purpose or non-infringing.
+   The entire risk as to the quality and performance of the Covered Software
+   is with You. Should any Covered Software prove defective in any respect,
+   You (not any Contributor) assume the cost of any necessary servicing,
+   repair, or correction. This disclaimer of warranty constitutes an essential
+   part of this License. No use of  any Covered Software is authorized under
+   this License except under this disclaimer.
+
+7. Limitation of Liability
+
+   Under no circumstances and under no legal theory, whether tort (including
+   negligence), contract, or otherwise, shall any Contributor, or anyone who
+   distributes Covered Software as permitted above, be liable to You for any
+   direct, indirect, special, incidental, or consequential damages of any
+   character including, without limitation, damages for lost profits, loss of
+   goodwill, work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses, even if such party shall have been
+   informed of the possibility of such damages. This limitation of liability
+   shall not apply to liability for death or personal injury resulting from
+   such party's negligence to the extent applicable law prohibits such
+   limitation. Some jurisdictions do not allow the exclusion or limitation of
+   incidental or consequential damages, so this exclusion and limitation may
+   not apply to You.
+
+8. Litigation
+
+   Any litigation relating to this License may be brought only in the courts
+   of a jurisdiction where the defendant maintains its principal place of
+   business and such litigation shall be governed by laws of that
+   jurisdiction, without reference to its conflict-of-law provisions. Nothing
+   in this Section shall prevent a party's ability to bring cross-claims or
+   counter-claims.
+
+9. Miscellaneous
+
+   This License represents the complete agreement concerning the subject
+   matter hereof. If any provision of this License is held to be
+   unenforceable, such provision shall be reformed only to the extent
+   necessary to make it enforceable. Any law or regulation which provides that
+   the language of a contract shall be construed against the drafter shall not
+   be used to construe this License against a Contributor.
+
+
+10. Versions of the License
+
+10.1. New Versions
+
+      Mozilla Foundation is the license steward. Except as provided in Section
+      10.3, no one other than the license steward has the right to modify or
+      publish new versions of this License. Each version will be given a
+      distinguishing version number.
+
+10.2. Effect of New Versions
+
+      You may distribute the Covered Software under the terms of the version
+      of the License under which You originally received the Covered Software,
+      or under the terms of any subsequent version published by the license
+      steward.
+
+10.3. Modified Versions
+
+      If you create software not governed by this License, and you want to
+      create a new license for such software, you may create and use a
+      modified version of this License if you rename the license and remove
+      any references to the name of the license steward (except to note that
+      such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+      Licenses If You choose to distribute Source Code Form that is
+      Incompatible With Secondary Licenses under the terms of this version of
+      the License, the notice described in Exhibit B of this License must be
+      attached.
+
+Exhibit A - Source Code Form License Notice
+
+      This Source Code Form is subject to the
+      terms of the Mozilla Public License, v.
+      2.0. If a copy of the MPL was not
+      distributed with this file, You can
+      obtain one at
+      http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular file,
+then You may include the notice in a location (such as a LICENSE file in a
+relevant directory) where a recipient would be likely to look for such a
+notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+
+      This Source Code Form is "Incompatible
+      With Secondary Licenses", as defined by
+      the Mozilla Public License, v. 2.0.
+
diff --git a/tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/index.js b/tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/index.js
new file mode 100644
index 0000000000..4fb6e340ed
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/index.js
@@ -0,0 +1,17 @@
+/**
+ * @fileoverview A processor to help parse the spidermonkey js code.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Plugin Definition
+// ------------------------------------------------------------------------------
+module.exports = {
+  processors: {
+    processor: require("../lib/processors/self-hosted"),
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/processors/self-hosted.js b/tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/processors/self-hosted.js
new file mode 100644
index 0000000000..c7dbf697fa
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/processors/self-hosted.js
@@ -0,0 +1,49 @@
+/**
+ * @fileoverview Remove macros from SpiderMonkey's self-hosted JS.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var path = require("path");
+
+const selfHostedRegex = /js\/src\/(?:builtin|shell)\/.*?\.js$/;
+const macroRegex = /\s*\#(if|ifdef|else|elif|endif|include|define|undef).*/;
+
+module.exports = {
+  preprocess(text, filename) {
+    if (path.win32) {
+      filename = filename.split(path.sep).join("/");
+    }
+    if (!selfHostedRegex.test(filename)) {
+      return [text];
+    }
+
+    let lines = text.split(/\n/);
+    for (let i = 0; i < lines.length; i++) {
+      if (!macroRegex.test(lines[i])) {
+        // No macro here, nothing to do.
+        continue;
+      }
+
+      for (; i < lines.length; i++) {
+        lines[i] = "// " + lines[i];
+
+        // If the line ends with a backslash (\), the next line
+        // is also part of part of the macro.
+        if (!lines[i].endsWith("\\")) {
+          break;
+        }
+      }
+    }
+
+    return [lines.join("\n")];
+  },
+
+  postprocess(messages, filename) {
+    return Array.prototype.concat.apply([], messages);
+  },
+};
diff --git a/tools/lint/eslint/eslint-plugin-spidermonkey-js/package.json b/tools/lint/eslint/eslint-plugin-spidermonkey-js/package.json
new file mode 100644
index 0000000000..61452d9e96
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-spidermonkey-js/package.json
@@ -0,0 +1,30 @@
+{
+  "name": "eslint-plugin-spidermonkey-js",
+  "version": "0.1.1",
+  "description": "A collection of rules that help enforce JavaScript coding standard in the Mozilla SpiderMonkey project.",
+  "keywords": [
+    "eslint",
+    "eslintplugin",
+    "eslint-plugin",
+    "mozilla",
+    "spidermonkey"
+  ],
+  "bugs": {
+    "url": "https://bugzilla.mozilla.org/enter_bug.cgi?product=Testing&component=Lint"
+  },
+  "homepage": "http://firefox-source-docs.mozilla.org/tools/lint/linters/eslint-plugin-spidermonkey-js.html",
+  "repository": {
+    "type": "hg",
+    "url": "https://hg.mozilla.org/mozilla-central/"
+  },
+  "author": "Mozilla",
+  "main": "lib/index.js",
+  "dependencies": {
+  },
+  "devDependencies": {
+  },
+  "engines": {
+    "node": ">=6.9.1"
+  },
+  "license": "MPL-2.0"
+}
diff --git a/tools/lint/eslint/manifest.tt b/tools/lint/eslint/manifest.tt
new file mode 100644
index 0000000000..e984e43d49
--- /dev/null
+++ b/tools/lint/eslint/manifest.tt
@@ -0,0 +1,10 @@
+[
+  {
+    "algorithm": "sha512",
+    "visibility": "public",
+    "filename": "eslint.tar.gz",
+    "unpack": true,
+    "digest": "ade0ac783a4efd0cff65fac77e8bbdc18189d6a0ba2f7258882d76e2d1a0d20e14bc56eab928353ab9abf15ae42a18eb3cf286787bd824500058d1194b6ca674",
+    "size": 8863963
+  }
+]
\ No newline at end of file
diff --git a/tools/lint/eslint/modules.json b/tools/lint/eslint/modules.json
new file mode 100644
index 0000000000..849783fc4d
--- /dev/null
+++ b/tools/lint/eslint/modules.json
@@ -0,0 +1,239 @@
+{
+
+  "Actions.jsm": ["actionTypes", "actionCreators", "actionUtils", "ASRouterActions", "globalImportContext", "UI_CODE", "BACKGROUND_PROCESS", "MAIN_MESSAGE_TYPE", "CONTENT_MESSAGE_TYPE", "PRELOAD_MESSAGE_TYPE"],
+  "ActivityStreamPrefs.jsm": ["DefaultPrefs", "Prefs"],
+  "ActivityStreamStorage.jsm": ["ActivityStreamStorage", "getDefaultOptions"],
+  "addon.js": ["Addon"],
+  "AddonManager.jsm": ["AddonManager", "AddonManagerPrivate"],
+  "addons.js": ["AddonsEngine", "AddonValidator"],
+  "addons.jsm": ["Addon", "STATE_ENABLED", "STATE_DISABLED"],
+  "addonsreconciler.js": ["AddonsReconciler", "CHANGE_INSTALLED", "CHANGE_UNINSTALLED", "CHANGE_ENABLED", "CHANGE_DISABLED"],
+  "AddonTestUtils.jsm": ["AddonTestUtils", "MockAsyncShutdown"],
+  "addonutils.js": ["AddonUtils"],
+  "ajv-4.1.1.js": ["Ajv"],
+  "AlertsHelper.jsm": [],
+  "AppData.jsm": ["makeFakeAppDir"],
+  "AppInfo.jsm": ["newAppInfo", "getAppInfo", "updateAppInfo"],
+  "ASRouterTargeting.jsm": ["ASRouterTargeting", "QueryCache", "CachedTargetingGetter"],
+  "async.js": ["Async"],
+  "AsyncSpellCheckTestHelper.jsm": ["onSpellCheck"],
+  "base-loader.js": ["Loader", "resolveURI", "Module", "Require", "unload"],
+  "bogus_element_type.jsm": [],
+  "bookmarks.js": ["BookmarksEngine", "PlacesItem", "Bookmark", "BookmarkFolder", "BookmarkQuery", "Livemark", "BookmarkSeparator", "BufferedBookmarksEngine"],
+  "bookmarks.jsm": ["PlacesItem", "Bookmark", "Separator", "Livemark", "BookmarkFolder", "DumpBookmarks"],
+  "bookmark_repair.js": ["BookmarkRepairRequestor", "BookmarkRepairResponder"],
+  "bookmark_validator.js": ["BookmarkValidator", "BookmarkProblemData"],
+  "browser-loader.js": ["BrowserLoader"],
+  "browser.js": ["browser", "Context", "WindowState"],
+  "browserid_identity.js": ["BrowserIDManager", "AuthenticationError"],
+  "capabilities.js": ["Capabilities", "PageLoadStrategy", "Proxy", "Timeouts", "UnhandledPromptBehavior"],
+  "cert.js": ["allowAllCerts"],
+  "clients.js": ["ClientEngine", "ClientsRec"],
+  "collection_repair.js": ["getRepairRequestor", "getAllRepairRequestors", "CollectionRepairRequestor", "getRepairResponder", "CollectionRepairResponder"],
+  "collection_validator.js": ["CollectionValidator", "CollectionProblemData"],
+  "Console.jsm": ["console", "ConsoleAPI"],
+  "constants.js": ["WEAVE_VERSION", "SYNC_API_VERSION", "STORAGE_VERSION", "PREFS_BRANCH", "DEFAULT_KEYBUNDLE_NAME", "SYNC_KEY_ENCODED_LENGTH", "SYNC_KEY_DECODED_LENGTH", "NO_SYNC_NODE_INTERVAL", "MAX_ERROR_COUNT_BEFORE_BACKOFF", "MINIMUM_BACKOFF_INTERVAL", "MAXIMUM_BACKOFF_INTERVAL", "HMAC_EVENT_INTERVAL", "MASTER_PASSWORD_LOCKED_RETRY_INTERVAL", "DEFAULT_GUID_FETCH_BATCH_SIZE", "DEFAULT_DOWNLOAD_BATCH_SIZE", "SINGLE_USER_THRESHOLD", "MULTI_DEVICE_THRESHOLD", "SCORE_INCREMENT_SMALL", "SCORE_INCREMENT_MEDIUM", "SCORE_INCREMENT_XLARGE", "SCORE_UPDATE_DELAY", "IDLE_OBSERVER_BACK_DELAY", "URI_LENGTH_MAX", "MAX_HISTORY_UPLOAD", "MAX_HISTORY_DOWNLOAD", "STATUS_OK", "SYNC_FAILED", "LOGIN_FAILED", "SYNC_FAILED_PARTIAL", "CLIENT_NOT_CONFIGURED", "STATUS_DISABLED", "MASTER_PASSWORD_LOCKED", "LOGIN_SUCCEEDED", "SYNC_SUCCEEDED", "ENGINE_SUCCEEDED", "LOGIN_FAILED_NO_USERNAME", "LOGIN_FAILED_NO_PASSPHRASE", "LOGIN_FAILED_NETWORK_ERROR", "LOGIN_FAILED_SERVER_ERROR", "LOGIN_FAILED_INVALID_PASSPHRASE", "LOGIN_FAILED_LOGIN_REJECTED", "METARECORD_DOWNLOAD_FAIL", "VERSION_OUT_OF_DATE", "CREDENTIALS_CHANGED", "ABORT_SYNC_COMMAND", "NO_SYNC_NODE_FOUND", "OVER_QUOTA", "SERVER_MAINTENANCE", "RESPONSE_OVER_QUOTA", "ENGINE_UPLOAD_FAIL", "ENGINE_DOWNLOAD_FAIL", "ENGINE_UNKNOWN_FAIL", "ENGINE_APPLY_FAIL", "ENGINE_BATCH_INTERRUPTED", "kSyncMasterPasswordLocked", "kSyncWeaveDisabled", "kSyncNetworkOffline", "kSyncBackoffNotMet", "kFirstSyncChoiceNotMade", "kSyncNotConfigured", "kFirefoxShuttingDown", "DEVICE_TYPE_DESKTOP", "DEVICE_TYPE_MOBILE", "SQLITE_MAX_VARIABLE_NUMBER"],
+  "Constants.jsm": ["Roles", "Events", "Relations", "Filters", "States", "Prefilters"],
+  "ContactDB.jsm": ["ContactDB", "DB_NAME", "STORE_NAME", "SAVED_GETALL_STORE_NAME", "REVISION_STORE", "DB_VERSION"],
+  "content-process.jsm": ["init"],
+  "content.jsm": ["registerContentFrame"],
+  "ContentCrashHandlers.jsm": ["TabCrashHandler", "SubframeCrashHandler", "UnsubmittedCrashHandler"],
+  "ContentPrefUtils.jsm": ["ContentPref", "cbHandleResult", "cbHandleError", "cbHandleCompletion", "safeCallback", "_methodsCallableFromChild"],
+  "cookies.js": ["Cookies"],
+  "CoverageUtils.jsm": ["CoverageCollector"],
+  "CrashManagerTest.jsm": ["configureLogging", "getManager", "sleep", "TestingCrashManager"],
+  "declined.js": ["DeclinedEngines"],
+  "distribution.js": ["DistributionCustomizer"],
+  "DNSTypes.jsm": ["DNS_QUERY_RESPONSE_CODES", "DNS_AUTHORITATIVE_ANSWER_CODES", "DNS_CLASS_CODES", "DNS_RECORD_TYPES"],
+  "doctor.js": ["Doctor"],
+  "dom.js": ["ContentEventObserverService", "WebElementEventTarget"],
+  "DOMRequestHelper.jsm": ["DOMRequestIpcHelper"],
+  "DownloadCore.jsm": ["Download", "DownloadSource", "DownloadTarget", "DownloadError", "DownloadSaver", "DownloadCopySaver", "DownloadLegacySaver"],
+  "DownloadList.jsm": ["DownloadList", "DownloadCombinedList", "DownloadSummary"],
+  "driver.js": ["GeckoDriver"],
+  "element.js": ["ChromeWebElement", "ContentWebElement", "ContentWebFrame", "ContentWebWindow", "element", "WebElement"],
+  "engines.js": ["EngineManager", "SyncEngine", "Tracker", "Store", "Changeset"],
+  "enginesync.js": ["EngineSynchronizer"],
+  "error.js": ["ElementClickInterceptedError", "ElementNotAccessibleError", "ElementNotInteractableError", "InsecureCertificateError", "InvalidArgumentError", "InvalidCookieDomainError", "InvalidElementStateError", "InvalidSelectorError", "InvalidSessionIDError", "JavaScriptError", "MoveTargetOutOfBoundsError", "NoSuchAlertError", "NoSuchElementError", "NoSuchFrameError", "NoSuchWindowError", "ScriptTimeoutError", "SessionNotCreatedError", "StaleElementReferenceError", "TimeoutError", "UnableToSetCookieError", "UnexpectedAlertOpenError", "UnknownCommandError", "UnknownError", "UnsupportedOperationError", "WebDriverError", "error", "stack"],
+  "evaluate.js": ["evaluate", "sandbox", "Sandboxes"],
+  "event-emitter.js": ["EventEmitter"],
+  "extension-storage.js": ["ExtensionStorageEngine", "EncryptionRemoteTransformer", "KeyRingEncryptionRemoteTransformer"],
+  "Extension.jsm": ["Extension", "ExtensionData"],
+  "ExtensionAPI.jsm": ["ExtensionAPI", "ExtensionAPIs"],
+  "ExtensionXPCShellUtils.jsm": ["ExtensionTestUtils"],
+  "fakeservices.js": ["FakeCryptoService", "FakeFilesystemService", "FakeGUIDService", "fakeSHA256HMAC"],
+  "file_expandosharing.jsm": ["checkFromJSM"],
+  "file_stringencoding.jsm": ["checkFromJSM"],
+  "file_url.jsm": ["checkFromJSM"],
+  "file_worker_url.jsm": ["checkFromJSM"],
+  "Finder.jsm": ["Finder", "GetClipboardSearchString", "SetClipboardSearchString"],
+  "format.js": ["pprint", "truncate"],
+  "formautofill.jsm": ["Address", "CreditCard", "DumpAddresses", "DumpCreditCards"],
+  "FormAutofillHeuristics.jsm": ["FormAutofillHeuristics", "LabelUtils"],
+  "FormAutofillStorage.jsm": ["formAutofillStorage"],
+  "FormAutofillSync.jsm": ["AddressesEngine", "CreditCardsEngine"],
+  "FormAutofillUtils.jsm": ["FormAutofillUtils", "AddressDataLoader"],
+  "forms.js": ["FormEngine", "FormRec", "FormValidator"],
+  "forms.jsm": ["FormData"],
+  "FrameScriptManager.jsm": ["getNewLoaderID"],
+  "fxaccounts.jsm": ["Authentication"],
+  "FxAccounts.jsm": ["fxAccounts", "FxAccounts"],
+  "FxAccountsCommands.js": ["SendTab", "FxAccountsCommands"],
+  "FxAccountsCommon.js": ["log", "logPII", "FXACCOUNTS_PERMISSION", "DATA_FORMAT_VERSION", "DEFAULT_STORAGE_FILENAME", "ASSERTION_LIFETIME", "ASSERTION_USE_PERIOD", "CERT_LIFETIME", "KEY_LIFETIME", "POLL_SESSION", "ONLOGIN_NOTIFICATION", "ONVERIFIED_NOTIFICATION", "ONLOGOUT_NOTIFICATION", "ON_COMMAND_RECEIVED_NOTIFICATION", "ON_DEVICE_CONNECTED_NOTIFICATION", "ON_DEVICE_DISCONNECTED_NOTIFICATION", "ON_PROFILE_UPDATED_NOTIFICATION", "ON_PASSWORD_CHANGED_NOTIFICATION", "ON_PASSWORD_RESET_NOTIFICATION", "ON_VERIFY_LOGIN_NOTIFICATION", "ON_ACCOUNT_DESTROYED_NOTIFICATION", "ON_COLLECTION_CHANGED_NOTIFICATION", "FXA_PUSH_SCOPE_ACCOUNT_UPDATE", "ON_PROFILE_CHANGE_NOTIFICATION", "ON_ACCOUNT_STATE_CHANGE_NOTIFICATION", "ON_NEW_DEVICE_ID", "COMMAND_SENDTAB", "SCOPE_PROFILE", "SCOPE_OLD_SYNC", "UI_REQUEST_SIGN_IN_FLOW", "UI_REQUEST_REFRESH_AUTH", "FX_OAUTH_CLIENT_ID", "WEBCHANNEL_ID", "COMMAND_PAIR_HEARTBEAT", "COMMAND_PAIR_SUPP_METADATA", "COMMAND_PAIR_AUTHORIZE", "COMMAND_PAIR_DECLINE", "COMMAND_PAIR_COMPLETE", "COMMAND_PAIR_PREFERENCES", "COMMAND_PROFILE_CHANGE", "COMMAND_CAN_LINK_ACCOUNT", "COMMAND_LOGIN", "COMMAND_LOGOUT", "COMMAND_DELETE", "COMMAND_SYNC_PREFERENCES", "COMMAND_CHANGE_PASSWORD", "COMMAND_FXA_STATUS", "PREF_LAST_FXA_USER", "PREF_REMOTE_PAIRING_URI", "ERRNO_ACCOUNT_ALREADY_EXISTS", "ERRNO_ACCOUNT_DOES_NOT_EXIST", "ERRNO_INCORRECT_PASSWORD", "ERRNO_UNVERIFIED_ACCOUNT", "ERRNO_INVALID_VERIFICATION_CODE", "ERRNO_NOT_VALID_JSON_BODY", "ERRNO_INVALID_BODY_PARAMETERS", "ERRNO_MISSING_BODY_PARAMETERS", "ERRNO_INVALID_REQUEST_SIGNATURE", "ERRNO_INVALID_AUTH_TOKEN", "ERRNO_INVALID_AUTH_TIMESTAMP", "ERRNO_MISSING_CONTENT_LENGTH", "ERRNO_REQUEST_BODY_TOO_LARGE", "ERRNO_TOO_MANY_CLIENT_REQUESTS", "ERRNO_INVALID_AUTH_NONCE", "ERRNO_ENDPOINT_NO_LONGER_SUPPORTED", "ERRNO_INCORRECT_LOGIN_METHOD", "ERRNO_INCORRECT_KEY_RETRIEVAL_METHOD", "ERRNO_INCORRECT_API_VERSION", "ERRNO_INCORRECT_EMAIL_CASE", "ERRNO_ACCOUNT_LOCKED", "ERRNO_ACCOUNT_UNLOCKED", "ERRNO_UNKNOWN_DEVICE", "ERRNO_DEVICE_SESSION_CONFLICT", "ERRNO_SERVICE_TEMP_UNAVAILABLE", "ERRNO_PARSE", "ERRNO_NETWORK", "ERRNO_UNKNOWN_ERROR", "OAUTH_SERVER_ERRNO_OFFSET", "ERRNO_UNKNOWN_CLIENT_ID", "ERRNO_INCORRECT_CLIENT_SECRET", "ERRNO_INCORRECT_REDIRECT_URI", "ERRNO_INVALID_FXA_ASSERTION", "ERRNO_UNKNOWN_CODE", "ERRNO_INCORRECT_CODE", "ERRNO_EXPIRED_CODE", "ERRNO_OAUTH_INVALID_TOKEN", "ERRNO_INVALID_REQUEST_PARAM", "ERRNO_INVALID_RESPONSE_TYPE", "ERRNO_UNAUTHORIZED", "ERRNO_FORBIDDEN", "ERRNO_INVALID_CONTENT_TYPE", "ERROR_ACCOUNT_ALREADY_EXISTS", "ERROR_ACCOUNT_DOES_NOT_EXIST", "ERROR_ACCOUNT_LOCKED", "ERROR_ACCOUNT_UNLOCKED", "ERROR_ALREADY_SIGNED_IN_USER", "ERROR_DEVICE_SESSION_CONFLICT", "ERROR_ENDPOINT_NO_LONGER_SUPPORTED", "ERROR_INCORRECT_API_VERSION", "ERROR_INCORRECT_EMAIL_CASE", "ERROR_INCORRECT_KEY_RETRIEVAL_METHOD", "ERROR_INCORRECT_LOGIN_METHOD", "ERROR_INVALID_EMAIL", "ERROR_INVALID_AUDIENCE", "ERROR_INVALID_AUTH_TOKEN", "ERROR_INVALID_AUTH_TIMESTAMP", "ERROR_INVALID_AUTH_NONCE", "ERROR_INVALID_BODY_PARAMETERS", "ERROR_INVALID_PASSWORD", "ERROR_INVALID_VERIFICATION_CODE", "ERROR_INVALID_REFRESH_AUTH_VALUE", "ERROR_INVALID_REQUEST_SIGNATURE", "ERROR_INTERNAL_INVALID_USER", "ERROR_MISSING_BODY_PARAMETERS", "ERROR_MISSING_CONTENT_LENGTH", "ERROR_NO_TOKEN_SESSION", "ERROR_NO_SILENT_REFRESH_AUTH", "ERROR_NOT_VALID_JSON_BODY", "ERROR_OFFLINE", "ERROR_PERMISSION_DENIED", "ERROR_REQUEST_BODY_TOO_LARGE", "ERROR_SERVER_ERROR", "ERROR_SYNC_DISABLED", "ERROR_TOO_MANY_CLIENT_REQUESTS", "ERROR_SERVICE_TEMP_UNAVAILABLE", "ERROR_UI_ERROR", "ERROR_UI_REQUEST", "ERROR_PARSE", "ERROR_NETWORK", "ERROR_UNKNOWN", "ERROR_UNKNOWN_DEVICE", "ERROR_UNVERIFIED_ACCOUNT", "ERROR_UNKNOWN_CLIENT_ID", "ERROR_INCORRECT_CLIENT_SECRET", "ERROR_INCORRECT_REDIRECT_URI", "ERROR_INVALID_FXA_ASSERTION", "ERROR_UNKNOWN_CODE", "ERROR_INCORRECT_CODE", "ERROR_EXPIRED_CODE", "ERROR_OAUTH_INVALID_TOKEN", "ERROR_INVALID_REQUEST_PARAM", "ERROR_INVALID_RESPONSE_TYPE", "ERROR_UNAUTHORIZED", "ERROR_FORBIDDEN", "ERROR_INVALID_CONTENT_TYPE", "ERROR_NO_ACCOUNT", "ERROR_AUTH_ERROR", "ERROR_INVALID_PARAMETER", "ERROR_CODE_METHOD_NOT_ALLOWED", "ERROR_MSG_METHOD_NOT_ALLOWED", "DERIVED_KEYS_NAMES", "FXA_PWDMGR_PLAINTEXT_FIELDS", "FXA_PWDMGR_SECURE_FIELDS", "FXA_PWDMGR_MEMORY_FIELDS", "FXA_PWDMGR_REAUTH_WHITELIST", "FXA_PWDMGR_HOST", "FXA_PWDMGR_REALM", "SERVER_ERRNO_TO_ERROR", "ERROR_TO_GENERAL_ERROR_CLASS"],
+  "FxAccountsOAuthGrantClient.jsm": ["FxAccountsOAuthGrantClient", "FxAccountsOAuthGrantClientError"],
+  "FxAccountsProfileClient.jsm": ["FxAccountsProfileClient", "FxAccountsProfileClientError"],
+  "FxAccountsPush.js": ["FxAccountsPushService"],
+  "FxAccountsStorage.jsm": ["FxAccountsStorageManagerCanStoreField", "FxAccountsStorageManager"],
+  "FxAccountsWebChannel.jsm": ["EnsureFxAccountsWebChannel"],
+  "fxa_utils.js": ["initializeIdentityWithTokenServerResponse"],
+  "Geometry.jsm": ["Point", "Rect"],
+  "Gestures.jsm": ["GestureSettings", "GestureTracker"],
+  "GMPInstallManager.jsm": ["GMPInstallManager", "GMPExtractor", "GMPDownloader", "GMPAddon"],
+  "GMPProvider.jsm": [],
+  "GMPUtils.jsm": ["GMP_PLUGIN_IDS", "GMPPrefs", "GMPUtils", "OPEN_H264_ID", "WIDEVINE_ID"],
+  "hawkclient.js": ["HawkClient"],
+  "hawkrequest.js": ["HAWKAuthenticatedRESTRequest", "deriveHawkCredentials"],
+  "helper.js": ["workerHelper"],
+  "HelperApps.jsm": ["App", "HelperApps"],
+  "history.js": ["HistoryEngine", "HistoryRec"],
+  "history.jsm": ["HistoryEntry", "DumpHistory"],
+  "Http.jsm": ["httpRequest", "percentEncode"],
+  "httpd.js": ["HTTP_400", "HTTP_401", "HTTP_402", "HTTP_403", "HTTP_404", "HTTP_405", "HTTP_406", "HTTP_407", "HTTP_408", "HTTP_409", "HTTP_410", "HTTP_411", "HTTP_412", "HTTP_413", "HTTP_414", "HTTP_415", "HTTP_417", "HTTP_500", "HTTP_501", "HTTP_502", "HTTP_503", "HTTP_504", "HTTP_505", "HttpError", "HttpServer"],
+  "import_module.jsm": ["MODULE_IMPORTED", "MODULE_URI", "SUBMODULE_IMPORTED", "same_scope", "SUBMODULE_IMPORTED_TO_SCOPE"],
+  "import_sub_module.jsm": ["SUBMODULE_IMPORTED", "test_obj"],
+  "InlineSpellChecker.jsm": ["InlineSpellChecker", "SpellCheckHelper"],
+  "jsdebugger.jsm": ["addDebuggerToGlobal", "addSandboxedDebuggerToGlobal"],
+  "jsesc.js": ["jsesc"],
+  "json2.js": ["JSON"],
+  "keys.js": ["BulkKeyBundle", "SyncKeyBundle"],
+  "kinto-http-client.js": ["KintoHttpClient"],
+  "kinto-offline-client.js": ["Kinto"],
+  "kinto-storage-adapter.js": ["FirefoxAdapter"],
+  "kvstore.jsm": ["KeyValueService"],
+  "L10nRegistry.jsm": ["L10nRegistry", "FileSource", "IndexedFileSource"],
+  "Launcher.jsm": ["BrowserToolboxLauncher"],
+  "loader-plugin-raw.jsm": ["requireRawId"],
+  "loader.js": ["WorkerDebuggerLoader", "worker"],
+  "Loader.jsm": ["DevToolsLoader", "require", "loader"],
+  "log.js": ["Log"],
+  "logger.jsm": ["Logger"],
+  "logging.js": ["getTestLogger", "initTestLogging"],
+  "LoginRecipes.jsm": ["LoginRecipesContent", "LoginRecipesParent"],
+  "logmanager.js": ["LogManager"],
+  "lz4.js": ["Lz4"],
+  "lz4_internal.js": ["Primitives"],
+  "main.js": ["Weave"],
+  "Manifest.jsm": ["Manifests"],
+  "MatchURLFilters.jsm": ["MatchURLFilters"],
+  "mcc_iso3166_table.jsm": ["MCC_ISO3166_TABLE"],
+  "message.js": ["Command", "Message", "MessageOrigin", "Response"],
+  "MessagePort.jsm": ["MessagePort", "MessageListener"],
+  "Messaging.jsm": ["sendMessageToJava", "Messaging", "EventDispatcher"],
+  "MigrationUtils.jsm": ["MigrationUtils", "MigratorPrototype"],
+  "MulticastDNSAndroid.jsm": ["MulticastDNS"],
+  "NativeMessaging.jsm": ["NativeApp"],
+  "NotificationDB.jsm": [],
+  "nsFormAutoCompleteResult.jsm": ["FormAutoCompleteResult"],
+  "observers.js": ["Observers"],
+  "offlineAppCache.jsm": ["OfflineAppCacheHelper"],
+  "OrientationChangeHandler.jsm": [],
+  "osfile.jsm": ["OS", "require"],
+  "osfile_async_front.jsm": ["OS"],
+  "osfile_native.jsm": ["read"],
+  "osfile_shared_allthreads.jsm": ["LOG", "clone", "Config", "Constants", "Type", "HollowStructure", "OSError", "Library", "declareFFI", "declareLazy", "declareLazyFFI", "normalizeBufferArgs", "projectValue", "isArrayBuffer", "isTypedArray", "defineLazyGetter", "OS"],
+  "osfile_unix_allthreads.jsm": ["declareFFI", "libc", "Error", "AbstractInfo", "AbstractEntry", "Type", "POS_START", "POS_CURRENT", "POS_END"],
+  "osfile_win_allthreads.jsm": ["declareFFI", "libc", "Error", "AbstractInfo", "AbstractEntry", "Type", "POS_START", "POS_CURRENT", "POS_END"],
+  "ospath_unix.jsm": ["basename", "dirname", "join", "normalize", "split", "toFileURI", "fromFileURI"],
+  "ospath_win.jsm": ["basename", "dirname", "join", "normalize", "split", "winGetDrive", "winIsAbsolute", "toFileURI", "fromFileURI"],
+  "OutputGenerator.jsm": ["UtteranceGenerator", "BrailleGenerator"],
+  "packets.js": ["RawPacket", "Packet", "JSONPacket", "BulkPacket"],
+  "PageMenu.jsm": ["PageMenuParent", "PageMenuChild"],
+  "PageThumbs.jsm": ["PageThumbs", "PageThumbsStorage"],
+  "passwords.js": ["PasswordEngine", "LoginRec", "PasswordValidator"],
+  "passwords.jsm": ["Password", "DumpPasswords"],
+  "PdfJsNetwork.jsm": ["NetworkManager"],
+  "PhoneNumberMetaData.jsm": ["PHONE_NUMBER_META_DATA"],
+  "PluginProvider.jsm": [],
+  "PointerAdapter.jsm": ["PointerRelay", "PointerAdapter"],
+  "policies.js": ["ErrorHandler", "SyncScheduler"],
+  "PreferenceExperiments.jsm": ["PreferenceExperiments", "migrateStorage"],
+  "prefs.js": ["Branch", "MarionettePrefs"],
+  "prefs.js": ["PrefsEngine", "PrefRec"],
+  "prefs.jsm": ["Preference"],
+  "pretty-fast.js": ["prettyFast"],
+  "profiler_get_symbols.js": ["wasm_bindgen"],
+  "PromiseWorker.jsm": ["BasePromiseWorker"],
+  "PushCrypto.jsm": ["PushCrypto", "concatArray"],
+  "quit.js": ["goQuitApplication"],
+  "record.js": ["WBORecord", "RecordManager", "CryptoWrapper", "CollectionKeyManager", "Collection"],
+  "recursive_importA.jsm": ["foo", "bar"],
+  "recursive_importB.jsm": ["baz", "qux"],
+  "Reducers.jsm": ["reducers", "INITIAL_STATE", "insertPinned", "TOP_SITES_DEFAULT_ROWS", "TOP_SITES_MAX_SITES_PER_ROW"],
+  "Redux.jsm": ["redux"],
+  "reflect.jsm": ["Reflect"],
+  "remote-settings.js": ["RemoteSettings", "jexlFilterFunc", "remoteSettingsBroadcastHandler"],
+  "RemotePageManagerChild.jsm": ["ChildMessagePort"],
+  "RemotePageManagerParent.jsm": ["RemotePages", "RemotePageManager"],
+  "resource.js": ["AsyncResource", "Resource"],
+  "resource://services-common/utils.js": ["CommonUtils"],
+  "resource://services-crypto/utils.js": ["CryptoUtils"],
+  "resource://testing-common/services/sync/utils.js": ["AccountState", "MockFxaStorageManager", "SyncTestingInfrastructure", "configureFxAccountIdentity", "configureIdentity", "encryptPayload", "makeFxAccountsInternalMock", "makeIdentityConfig", "promiseNamedTimer", "promiseZeroTimer", "sumHistogram", "syncTestLogging", "waitForZeroTimer"],
+  "rest.js": ["RESTRequest", "RESTResponse", "TokenAuthenticatedRESTRequest"],
+  "rotaryengine.js": ["RotaryEngine", "RotaryRecord", "RotaryStore", "RotaryTracker"],
+  "Schemas.jsm": ["SchemaRoot", "Schemas"],
+  "SearchShortcuts.jsm": ["checkHasSearchEngine", "getSearchProvider", "SEARCH_SHORTCUTS", "CUSTOM_SEARCH_SHORTCUTS", "SEARCH_SHORTCUTS_EXPERIMENT", "SEARCH_SHORTCUTS_SEARCH_ENGINES_PREF", "SEARCH_SHORTCUTS_HAVE_PINNED_PREF"],
+  "SectionsManager.jsm": ["SectionsFeed", "SectionsManager"],
+  "service.js": ["Service"],
+  "SharedPromptUtils.jsm": ["PromptUtils", "EnableDelayHelper"],
+  "ShortURL.jsm": ["shortURL", "getETLD"],
+  "ShutdownLeaksCollector.jsm": ["ContentCollector"],
+  "SignInToWebsite.jsm": ["SignInToWebsiteController"],
+  "SiteClassifier.jsm": ["classifySite"],
+  "Social.jsm": ["Social", "OpenGraphBuilder", "DynamicResizeWatcher", "sizeSocialPanelToContent"],
+  "SpecialPowersObserver.jsm": ["SpecialPowersObserver", "SpecialPowersObserverFactory"],
+  "StateMachineHelper.jsm": ["State", "CommandType"],
+  "status.js": ["Status"],
+  "storageserver.js": ["ServerBSO", "StorageServerCallback", "StorageServerCollection", "StorageServer", "storageServerForUsers"],
+  "stream-utils.js": ["StreamUtils"],
+  "StructuredLog.jsm": ["StructuredLogger", "StructuredFormatter"],
+  "StyleEditorUtil.jsm": ["getString", "assert", "log", "text", "wire", "showFilePicker"],
+  "subprocess_common.jsm": ["BaseProcess", "PromiseWorker", "SubprocessConstants"],
+  "subprocess_shared.js": ["Library", "SubprocessConstants"],
+  "subprocess_shared_unix.js": ["libc"],
+  "subprocess_shared_win.js": ["LIBC", "Win", "createPipe", "libc"],
+  "subprocess_unix.jsm": ["SubprocessImpl"],
+  "subprocess_win.jsm": ["SubprocessImpl"],
+  "subprocess_worker_common.js": ["BasePipe", "BaseProcess", "debug"],
+  "sync.js": ["executeSoon", "DebounceCallback", "IdlePromise", "MessageManagerDestroyedPromise", "PollPromise", "Sleep", "TimedPromise", "waitForEvent", "waitForMessage", "waitForObserverTopic"],
+  "sync.jsm": ["Authentication"],
+  "SyncedBookmarksMirror.jsm": ["SyncedBookmarksMirror"],
+  "tabs.js": ["TabEngine", "TabSetRecord"],
+  "tabs.jsm": ["BrowserTabs"],
+  "tcpsocket_test.jsm": ["createSocket", "createServer", "enablePrefsAndPermissions", "socketCompartmentInstanceOfArrayBuffer"],
+  "telemetry.js": ["SyncTelemetry"],
+  "test.jsm": ["Foo"],
+  "test2.jsm": ["Bar"],
+  "test_bug883784.jsm": ["Test"],
+  "Timer.jsm": ["setTimeout", "setTimeoutWithTarget", "clearTimeout", "setInterval", "setIntervalWithTarget", "clearInterval", "requestIdleCallback", "cancelIdleCallback"],
+  "TippyTopProvider.jsm": ["TippyTopProvider", "getDomain"],
+  "Tokenize.jsm": ["tokenize", "toksToTfIdfVector"],
+  "tokenserverclient.js": ["TokenServerClient", "TokenServerClientError", "TokenServerClientNetworkError", "TokenServerClientServerError"],
+  "tps.jsm": ["ACTIONS", "Addons", "Addresses", "Bookmarks", "CreditCards", "Formdata", "History", "Passwords", "Prefs", "Tabs", "TPS", "Windows"],
+  "Translation.jsm": ["Translation", "TranslationTelemetry"],
+  "Traversal.jsm": ["TraversalRules", "TraversalHelper"],
+  "UpdateTelemetry.jsm": ["AUSTLMY"],
+  "UpdateTopLevelContentWindowIDHelper.jsm": ["trackBrowserWindow"],
+  "uptake-telemetry.js": ["UptakeTelemetry"],
+  "UrlbarUtils.jsm": ["UrlbarQueryContext", "UrlbarMuxer", "UrlbarProvider", "UrlbarUtils"],
+  "util.js": ["getChromeWindow", "Utils", "Svc", "SerializableSet"],
+  "utils.js": ["encryptPayload", "makeIdentityConfig", "makeFxAccountsInternalMock", "configureFxAccountIdentity", "configureIdentity", "SyncTestingInfrastructure", "waitForZeroTimer", "MockFxaStorageManager", "AccountState", "sumHistogram", "CommonUtils", "CryptoUtils", "TestingUtils", "promiseZeroTimer", "promiseNamedTimer", "getLoginTelemetryScalar", "syncTestLogging"],
+  "Utils.jsm": ["Utils", "Logger", "PivotContext", "PrefCache"],
+  "VariablesView.jsm": ["VariablesView", "escapeHTML"],
+  "version.jsm": ["VERSION"],
+  "vtt.jsm": ["WebVTT"],
+  "WebChannel.jsm": ["WebChannel", "WebChannelBroker"],
+  "windows.jsm": ["BrowserWindows"],
+  "WindowsJumpLists.jsm": ["WinTaskbarJumpList"],
+  "WindowsPreviewPerTab.jsm": ["AeroPeek"],
+  "xul-app.jsm": ["XulApp"]
+}
diff --git a/tools/lint/eslint/setup_helper.py b/tools/lint/eslint/setup_helper.py
new file mode 100644
index 0000000000..24fd8808b9
--- /dev/null
+++ b/tools/lint/eslint/setup_helper.py
@@ -0,0 +1,408 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import os
+import platform
+import re
+import subprocess
+import sys
+from distutils.version import LooseVersion
+from filecmp import dircmp
+
+from mozbuild.nodeutil import (
+    find_node_executable,
+    find_npm_executable,
+    NPM_MIN_VERSION,
+    NODE_MIN_VERSION,
+)
+from mozbuild.util import ensure_subprocess_env
+from mozfile.mozfile import remove as mozfileremove
+
+
+NODE_MACHING_VERSION_NOT_FOUND_MESSAGE = """
+Could not find Node.js executable later than %s.
+
+Executing `mach bootstrap --no-system-changes` should
+install a compatible version in ~/.mozbuild on most platforms.
+""".strip()
+
+NPM_MACHING_VERSION_NOT_FOUND_MESSAGE = """
+Could not find npm executable later than %s.
+
+Executing `mach bootstrap --no-system-changes` should
+install a compatible version in ~/.mozbuild on most platforms.
+""".strip()
+
+NODE_NOT_FOUND_MESSAGE = """
+nodejs is either not installed or is installed to a non-standard path.
+
+Executing `mach bootstrap --no-system-changes` should
+install a compatible version in ~/.mozbuild on most platforms.
+""".strip()
+
+NPM_NOT_FOUND_MESSAGE = """
+Node Package Manager (npm) is either not installed or installed to a
+non-standard path.
+
+Executing `mach bootstrap --no-system-changes` should
+install a compatible version in ~/.mozbuild on most platforms.
+""".strip()
+
+
+VERSION_RE = re.compile(r"^\d+\.\d+\.\d+$")
+CARET_VERSION_RANGE_RE = re.compile(r"^\^((\d+)\.\d+\.\d+)$")
+
+project_root = None
+
+
+def eslint_maybe_setup():
+    """Setup ESLint only if it is needed."""
+    has_issues, needs_clobber = eslint_module_needs_setup()
+
+    if has_issues:
+        eslint_setup(needs_clobber)
+
+
+def eslint_setup(should_clobber=False):
+    """Ensure eslint is optimally configured.
+
+    This command will inspect your eslint configuration and
+    guide you through an interactive wizard helping you configure
+    eslint for optimal use on Mozilla projects.
+    """
+    package_setup(get_project_root(), "eslint", should_clobber=should_clobber)
+
+
+def package_setup(
+    package_root,
+    package_name,
+    should_update=False,
+    should_clobber=False,
+    no_optional=False,
+):
+    """Ensure `package_name` at `package_root` is installed.
+
+    When `should_update` is true, clobber, install, and produce a new
+    "package-lock.json" file.
+
+    This populates `package_root/node_modules`.
+
+    """
+    orig_project_root = get_project_root()
+    orig_cwd = os.getcwd()
+
+    if should_update:
+        should_clobber = True
+
+    try:
+        set_project_root(package_root)
+        sys.path.append(os.path.dirname(__file__))
+
+        # npm sometimes fails to respect cwd when it is run using check_call so
+        # we manually switch folders here instead.
+        project_root = get_project_root()
+        os.chdir(project_root)
+
+        if should_clobber:
+            node_modules_path = os.path.join(project_root, "node_modules")
+            print("Clobbering %s..." % node_modules_path)
+            if sys.platform.startswith("win") and have_winrm():
+                process = subprocess.Popen(["winrm", "-rf", node_modules_path])
+                process.wait()
+            else:
+                mozfileremove(node_modules_path)
+
+        npm_path, _ = find_npm_executable()
+        if not npm_path:
+            return 1
+
+        node_path, _ = find_node_executable()
+        if not node_path:
+            return 1
+
+        extra_parameters = ["--loglevel=error"]
+
+        if no_optional:
+            extra_parameters.append("--no-optional")
+
+        package_lock_json_path = os.path.join(get_project_root(), "package-lock.json")
+
+        if should_update:
+            cmd = [npm_path, "install"]
+            mozfileremove(package_lock_json_path)
+        else:
+            cmd = [npm_path, "ci"]
+
+        # On non-Windows, ensure npm is called via node, as node may not be in the
+        # path.
+        if platform.system() != "Windows":
+            cmd.insert(0, node_path)
+
+        # Ensure that bare `node` and `npm` in scripts, including post-install scripts, finds the
+        # binary we're invoking with.  Without this, it's easy for compiled extensions to get
+        # mismatched versions of the Node.js extension API.
+        extra_parameters.append("--scripts-prepend-node-path")
+
+        cmd.extend(extra_parameters)
+
+        print('Installing %s for mach using "%s"...' % (package_name, " ".join(cmd)))
+        result = call_process(package_name, cmd)
+
+        if not result:
+            return 1
+
+        bin_path = os.path.join(
+            get_project_root(), "node_modules", ".bin", package_name
+        )
+
+        print("\n%s installed successfully!" % package_name)
+        print("\nNOTE: Your local %s binary is at %s\n" % (package_name, bin_path))
+
+    finally:
+        set_project_root(orig_project_root)
+        os.chdir(orig_cwd)
+
+
+def call_process(name, cmd, cwd=None, append_env={}):
+    env = dict(os.environ)
+    env.update(ensure_subprocess_env(append_env))
+
+    try:
+        with open(os.devnull, "w") as fnull:
+            subprocess.check_call(cmd, cwd=cwd, stdout=fnull, env=env)
+    except subprocess.CalledProcessError:
+        if cwd:
+            print("\nError installing %s in the %s folder, aborting." % (name, cwd))
+        else:
+            print("\nError installing %s, aborting." % name)
+
+        return False
+
+    return True
+
+
+def expected_eslint_modules():
+    # Read the expected version of ESLint and external modules
+    expected_modules_path = os.path.join(get_project_root(), "package.json")
+    with open(expected_modules_path, "r", encoding="utf-8") as f:
+        sections = json.load(f)
+        expected_modules = sections.get("dependencies", {})
+        expected_modules.update(sections.get("devDependencies", {}))
+
+    # Also read the in-tree ESLint plugin mozilla information, to ensure the
+    # dependencies are up to date.
+    mozilla_json_path = os.path.join(
+        get_eslint_module_path(), "eslint-plugin-mozilla", "package.json"
+    )
+    with open(mozilla_json_path, "r", encoding="utf-8") as f:
+        expected_modules.update(json.load(f).get("dependencies", {}))
+
+    # Also read the in-tree ESLint plugin spidermonkey information, to ensure the
+    # dependencies are up to date.
+    mozilla_json_path = os.path.join(
+        get_eslint_module_path(), "eslint-plugin-spidermonkey-js", "package.json"
+    )
+    with open(mozilla_json_path, "r", encoding="utf-8") as f:
+        expected_modules.update(json.load(f).get("dependencies", {}))
+
+    return expected_modules
+
+
+def check_eslint_files(node_modules_path, name):
+    def check_file_diffs(dcmp):
+        # Diff files only looks at files that are different. Not for files
+        # that are only present on one side. This should be generally OK as
+        # new files will need to be added in the index.js for the package.
+        if dcmp.diff_files and dcmp.diff_files != ["package.json"]:
+            return True
+
+        result = False
+
+        # Again, we only look at common sub directories for the same reason
+        # as above.
+        for sub_dcmp in dcmp.subdirs.values():
+            result = result or check_file_diffs(sub_dcmp)
+
+        return result
+
+    dcmp = dircmp(
+        os.path.join(node_modules_path, name),
+        os.path.join(get_eslint_module_path(), name),
+    )
+
+    return check_file_diffs(dcmp)
+
+
+def eslint_module_needs_setup():
+    has_issues = False
+    needs_clobber = False
+    node_modules_path = os.path.join(get_project_root(), "node_modules")
+
+    for name, expected_data in expected_eslint_modules().items():
+        # expected_eslint_modules returns a string for the version number of
+        # dependencies for installation of eslint generally, and an object
+        # for our in-tree plugins (which contains the entire module info).
+        if "version" in expected_data:
+            version_range = expected_data["version"]
+        else:
+            version_range = expected_data
+
+        path = os.path.join(node_modules_path, name, "package.json")
+
+        if not os.path.exists(path):
+            print("%s v%s needs to be installed locally." % (name, version_range))
+            has_issues = True
+            continue
+        data = json.load(open(path, encoding="utf-8"))
+
+        if version_range.startswith("file:"):
+            # We don't need to check local file installations for versions, as
+            # these are symlinked, so we'll always pick up the latest.
+            continue
+
+        if name == "eslint" and LooseVersion("4.0.0") > LooseVersion(data["version"]):
+            print("ESLint is an old version, clobbering node_modules directory")
+            needs_clobber = True
+            has_issues = True
+            continue
+
+        if not version_in_range(data["version"], version_range):
+            print("%s v%s should be v%s." % (name, data["version"], version_range))
+            has_issues = True
+            continue
+
+    return has_issues, needs_clobber
+
+
+def version_in_range(version, version_range):
+    """
+    Check if a module version is inside a version range.  Only supports explicit versions and
+    caret ranges for the moment, since that's all we've used so far.
+    """
+    if version == version_range:
+        return True
+
+    version_match = VERSION_RE.match(version)
+    if not version_match:
+        raise RuntimeError("mach eslint doesn't understand module version %s" % version)
+    version = LooseVersion(version)
+
+    # Caret ranges as specified by npm allow changes that do not modify the left-most non-zero
+    # digit in the [major, minor, patch] tuple.  The code below assumes the major digit is
+    # non-zero.
+    range_match = CARET_VERSION_RANGE_RE.match(version_range)
+    if range_match:
+        range_version = range_match.group(1)
+        range_major = int(range_match.group(2))
+
+        range_min = LooseVersion(range_version)
+        range_max = LooseVersion("%d.0.0" % (range_major + 1))
+
+        return range_min <= version < range_max
+
+    return False
+
+
+def get_possible_node_paths_win():
+    """
+    Return possible nodejs paths on Windows.
+    """
+    if platform.system() != "Windows":
+        return []
+
+    return list(
+        {
+            "%s\\nodejs" % os.environ.get("SystemDrive"),
+            os.path.join(os.environ.get("ProgramFiles"), "nodejs"),
+            os.path.join(os.environ.get("PROGRAMW6432"), "nodejs"),
+            os.path.join(os.environ.get("PROGRAMFILES"), "nodejs"),
+        }
+    )
+
+
+def get_version(path):
+    try:
+        version_str = subprocess.check_output(
+            [path, "--version"], stderr=subprocess.STDOUT, universal_newlines=True
+        )
+        return version_str
+    except (subprocess.CalledProcessError, OSError):
+        return None
+
+
+def set_project_root(root=None):
+    """Sets the project root to the supplied path, or works out what the root
+    is based on looking for 'mach'.
+
+    Keyword arguments:
+    root - (optional) The path to set the root to.
+    """
+    global project_root
+
+    if root:
+        project_root = root
+        return
+
+    file_found = False
+    folder = os.getcwd()
+
+    while folder:
+        if os.path.exists(os.path.join(folder, "mach")):
+            file_found = True
+            break
+        else:
+            folder = os.path.dirname(folder)
+
+    if file_found:
+        project_root = os.path.abspath(folder)
+
+
+def get_project_root():
+    """Returns the absolute path to the root of the project, see set_project_root()
+    for how this is determined.
+    """
+    global project_root
+
+    if not project_root:
+        set_project_root()
+
+    return project_root
+
+
+def get_eslint_module_path():
+    return os.path.join(get_project_root(), "tools", "lint", "eslint")
+
+
+def check_node_executables_valid():
+    node_path, version = find_node_executable()
+    if not node_path:
+        print(NODE_NOT_FOUND_MESSAGE)
+        return False
+    if not version:
+        print(NODE_MACHING_VERSION_NOT_FOUND_MESSAGE % NODE_MIN_VERSION)
+        return False
+
+    npm_path, version = find_npm_executable()
+    if not npm_path:
+        print(NPM_NOT_FOUND_MESSAGE)
+        return False
+    if not version:
+        print(NPM_MACHING_VERSION_NOT_FOUND_MESSAGE % NPM_MIN_VERSION)
+        return False
+
+    return True
+
+
+def have_winrm():
+    # `winrm -h` should print 'winrm version ...' and exit 1
+    try:
+        p = subprocess.Popen(
+            ["winrm.exe", "-h"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT
+        )
+        return p.wait() == 1 and p.stdout.read().startswith("winrm")
+    except Exception:
+        return False
diff --git a/tools/lint/eslint/update.sh b/tools/lint/eslint/update.sh
new file mode 100755
index 0000000000..3367a599e0
--- /dev/null
+++ b/tools/lint/eslint/update.sh
@@ -0,0 +1,71 @@
+#!/bin/sh
+# Script to regenerate the npm packages used for ESLint by the builders.
+# Requires
+
+# Force the scripts working directory to be projdir/tools/lint/eslint.
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+cd $DIR
+
+echo "To complete this script you will need the following tokens from https://mozilla-releng.net/tokens"
+echo " - tooltool.upload.public"
+echo " - tooltool.download.public"
+echo ""
+read -p "Are these tokens visible at the above URL (y/n)?" choice
+case "$choice" in
+  y|Y )
+    echo ""
+    echo "1. Go to https://mozilla-releng.net"
+    echo "2. Log in using your Mozilla LDAP account."
+    echo "3. Click on \"Tokens.\""
+    echo "4. Issue a user token with the permissions tooltool.upload.public and tooltool.download.public."
+    echo ""
+    echo "When you click issue you will be presented with a long string. Paste the string into a temporary file called ~/.tooltool-token."
+    echo ""
+    read -rsp $'Press any key to continue...\n' -n 1
+    ;;
+  n|N )
+    echo ""
+    echo "You will need to contact somebody that has these permissions... people most likely to have these permissions are members of the releng, ateam, a sheriff, mratcliffe, or jryans"
+    exit 1
+    ;;
+  * )
+    echo ""
+  echo "Invalid input."
+  continue
+    ;;
+esac
+
+echo ""
+echo "Removing node_modules and package-lock.json..."
+# Move to the top-level directory.
+cd ../../../
+rm -rf node_modules/
+rm -rf tools/lint/eslint/eslint-plugin-mozilla/node_modules
+rm package-lock.json
+
+echo "Installing eslint and external plugins..."
+# ESLint and all _external_ plugins are listed in this directory's package.json,
+# so a regular `npm install` will install them at the specified versions.
+# The in-tree eslint-plugin-mozilla is kept out of this tooltool archive on
+# purpose so that it can be changed by any developer without requiring tooltool
+# access to make changes.
+npm install
+
+echo "Creating eslint.tar.gz..."
+tar cvz --exclude=eslint-plugin-mozilla --exclude=eslint-plugin-spidermonkey-js -f eslint.tar.gz node_modules
+
+echo "Adding eslint.tar.gz to tooltool..."
+rm tools/lint/eslint/manifest.tt
+./python/mozbuild/mozbuild/action/tooltool.py add --visibility public --unpack eslint.tar.gz
+
+echo "Uploading eslint.tar.gz to tooltool..."
+./python/mozbuild/mozbuild/action/tooltool.py upload --authentication-file=~/.tooltool-token --message "node_modules folder update for tools/lint/eslint"
+
+echo "Cleaning up..."
+mv manifest.tt tools/lint/eslint/manifest.tt
+rm eslint.tar.gz
+
+cd $DIR
+
+echo ""
+echo "Update complete, please commit and check in your changes."
diff --git a/tools/lint/file-perm.yml b/tools/lint/file-perm.yml
new file mode 100644
index 0000000000..1d0f66e564
--- /dev/null
+++ b/tools/lint/file-perm.yml
@@ -0,0 +1,45 @@
+---
+file-perm:
+    description: File permission check
+    include:
+        - .
+    extensions:
+        - .c
+        - .cc
+        - .cpp
+        - .flac
+        - .h
+        - .html
+        - .jsm
+        - .jsx
+        - .m
+        - .m4s
+        - .mm
+        - .mp4
+        - .png
+        - .rs
+        - .svg
+        - .ttf
+        - .wasm
+        - .xhtml
+        - .xml
+        - .xul
+        - .yml
+    support-files:
+        - 'tools/lint/file-perm/**'
+    type: external
+    payload: file-perm:lint
+
+maybe-shebang-file-perm:
+    description: "File permission check for files that might have `#!` header."
+    include:
+        - .
+    allow-shebang: true
+    extensions:
+        - .js
+        - .py
+        - .sh
+    support-files:
+        - 'tools/lint/file-perm/**'
+    type: external
+    payload: file-perm:lint
diff --git a/tools/lint/file-perm/__init__.py b/tools/lint/file-perm/__init__.py
new file mode 100644
index 0000000000..f6cc605b1e
--- /dev/null
+++ b/tools/lint/file-perm/__init__.py
@@ -0,0 +1,43 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import platform
+
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+
+def lint(paths, config, fix=None, **lintargs):
+    results = []
+
+    if platform.system() == "Windows":
+        # Windows doesn't have permissions in files
+        # Exit now
+        return results
+
+    files = list(expand_exclusions(paths, config, lintargs["root"]))
+    for f in files:
+        if os.access(f, os.X_OK):
+            if config.get("allow-shebang"):
+                with open(f, "r+") as content:
+                    # Some source files have +x permissions
+                    line = content.readline()
+                    if line.startswith("#!"):
+                        # Check if the file doesn't start with a shebang
+                        # if it does, not a warning
+                        continue
+
+            if fix:
+                # We want to fix it, do it and leave
+                os.chmod(f, 0o644)
+                continue
+
+            res = {
+                "path": f,
+                "message": "Execution permissions on a source file",
+                "level": "error",
+            }
+            results.append(result.from_config(config, **res))
+    return results
diff --git a/tools/lint/file-whitespace.yml b/tools/lint/file-whitespace.yml
new file mode 100644
index 0000000000..278d7a40ca
--- /dev/null
+++ b/tools/lint/file-whitespace.yml
@@ -0,0 +1,201 @@
+---
+file-whitespace:
+    description: File content sanity check
+    include:
+        - .
+    exclude:
+        - accessible/tests/crashtests
+        - accessible/tests/mochitest
+        - browser/locales/en-US/chrome/browser/uiDensity.properties
+        - build/pgo/blueprint
+        - build/pgo/js-input
+        - devtools/client/debugger/test
+        - devtools/client/inspector/markup/test
+        - devtools/client/inspector/rules/test
+        - devtools/client/inspector/test
+        - devtools/client/shared/test/doc_inline-debugger-statement.html
+        # Excluded because tests were failing unexpectedly
+        - devtools/client/styleeditor/test/sync_with_csp.css
+        - devtools/client/webconsole/test/browser/test-message-categories-css-parser.css
+        - devtools/shared/webconsole/test/chrome/test_jsterm.html
+        - devtools/shared/webconsole/test/chrome/test_object_actor_native_getters.html
+        - docshell/base/crashtests
+        - docshell/test
+        - dom/base/crashtests
+        - dom/base/test
+        - dom/bindings/Codegen.py
+        - dom/bindings/Configuration.py
+        - dom/bindings/parser/WebIDL.py
+        - dom/bindings/parser/tests/test_attributes_on_types.py
+        - dom/bindings/parser/tests/test_extended_attributes.py
+        - dom/bindings/parser/tests/test_interface.py
+        - dom/bindings/parser/tests/test_record.py
+        - dom/bindings/parser/tests/test_securecontext_extended_attribute.py
+        - dom/bindings/parser/tests/test_special_methods.py
+        - dom/bindings/parser/tests/test_toJSON.py
+        - dom/bindings/parser/tests/test_typedef.py
+        - dom/canvas/crashtests
+        - dom/canvas/test
+        - dom/events/crashtests
+        - dom/events/test
+        - dom/file/tests/file_mozfiledataurl_inner.html
+        - dom/html/crashtests
+        - dom/html/reftests
+        - dom/html/test
+        - dom/jsurl/crashtests/344996-1.xhtml
+        - dom/jsurl/test
+        - dom/media/mediasource/test/crashtests/926665.html
+        - dom/media/test
+        - dom/media/tests
+        - dom/media/webaudio/test
+        - dom/media/webrtc/transport/nricectx.cpp
+        - dom/media/webspeech/synth/test
+        - dom/plugins/test
+        - dom/smil/crashtests
+        - dom/smil/test
+        - dom/security/test
+        - dom/svg/crashtests
+        - dom/svg/test
+        - dom/webauthn/winwebauthn/webauthn.h
+        - dom/websocket/tests/file_websocket_wsh.py
+        - dom/tests/mochitest
+        - dom/xml/crashtests
+        - dom/xml/test
+        - dom/xslt/crashtests
+        - dom/xslt/tests
+        - dom/xul/crashtests
+        - dom/xul/test
+        - editor/composer/test
+        - editor/composer/crashtests/removing-editable-xslt.html
+        - editor/libeditor/tests
+        - editor/libeditor/crashtests
+        - editor/reftests
+        - extensions/universalchardet
+        - gfx/tests/crashtests
+        - gfx/vr/nsFxrCommandLineHandler.cpp
+        - gfx/vr/vrhost/vrhostapi.cpp
+        - image/test/crashtests
+        - image/test/mochitest
+        - image/test/reftest
+        - intl/lwbrk/crashtests
+        - intl/uconv/crashtests
+        - intl/uconv/tests
+        - intl/strres/tests/unit/397093.properties
+        - intl/strres/tests/unit/strres.properties
+        - js/xpconnect/crashtests
+        - js/xpconnect/tests
+        - js/src/frontend/BytecodeEmitter.cpp
+        - js/src/frontend/SharedContext.h
+        - layout/base/crashtests
+        - layout/base/tests
+        - layout/forms/crashtests
+        - layout/forms/test
+        - layout/generic/crashtests
+        - layout/generic/test
+        - layout/inspector/tests
+        - layout/mathml/tests
+        - layout/mathml/crashtests
+        - layout/painting/crashtests/1405881-1.html
+        - layout/painting/crashtests/1407470-1.html
+        - layout/reftests
+        - layout/style/crashtests
+        - layout/style/test
+        - layout/svg/crashtests
+        - layout/tables/test/test_bug337124.html
+        - layout/tables/crashtests
+        - layout/xul/crashtests
+        - layout/xul/reftest
+        - layout/xul/test
+        - layout/xul/tree
+        - modules/libjar/zipwriter/test/unit/data/test_bug399727.html
+        - netwerk/test/crashtests
+        - netwerk/test/mochitests/test1.css
+        - netwerk/test/mochitests/test2.css
+        - netwerk/dns/prepare_tlds.py
+        - parser/htmlparser/tests
+        - parser/html/java/named-character-references.html
+        - python/devtools/migrate-l10n/migrate/main.py
+        - python/l10n/convert_xul_to_fluent/convert.py
+        - python/l10n/convert_xul_to_fluent/lib/__init__.py
+        - python/l10n/convert_xul_to_fluent/lib/dtd.py
+        - python/l10n/convert_xul_to_fluent/lib/fluent.py
+        - python/l10n/convert_xul_to_fluent/lib/migration.py
+        - python/l10n/convert_xul_to_fluent/lib/utils.py
+        - python/l10n/convert_xul_to_fluent/lib/xul.py
+        - testing/mochitest/bisection.py
+        - testing/mozharness/configs/raptor/linux64_config_taskcluster.py
+        - testing/mozharness/configs/talos/linux64_config_taskcluster.py
+        - testing/mozharness/configs/web_platform_tests/test_config_windows.py
+        - testing/talos/talos/cmanager_base.py
+        - testing/talos/talos/pageloader/chrome/pageloader.xhtml
+        - testing/talos/talos/tests
+        - testing/talos/talos/unittests/conftest.py
+        - testing/talos/talos/unittests/test_test.py
+        - testing/talos/talos/unittests/test_xtalos.py
+        - testing/web-platform/mozilla/tests/editor
+        - testing/web-platform/mozilla/tests/focus
+        - testing/web-platform/tests
+        - testing/web-platform/tests/conformance-checkers
+        - testing/web-platform/tests/content-security-policy
+        - testing/web-platform/tests/css/tools/apiclient/apiclient/__init__.py
+        - testing/web-platform/tests/css/tools/apiclient/apiclient/apiclient.py
+        - testing/web-platform/tests/css/tools/apiclient/apiclient/uritemplate.py
+        - testing/web-platform/tests/css/tools/apiclient/setup.py
+        - testing/web-platform/tests/css/tools/apiclient/test.py
+        - testing/web-platform/tests/css/tools/w3ctestlib/Groups.py
+        - testing/web-platform/tests/css/tools/w3ctestlib/HTMLSerializer.py
+        - testing/web-platform/tests/css/tools/w3ctestlib/Indexer.py
+        - testing/web-platform/tests/css/tools/w3ctestlib/OutputFormats.py
+        - testing/web-platform/tests/css/tools/w3ctestlib/Suite.py
+        - testing/web-platform/tests/css/tools/w3ctestlib/Utils.py
+        - testing/web-platform/tests/css/tools/w3ctestlib/__init__.py
+        - testing/web-platform/tests/css/tools/w3ctestlib/templates/indices.css
+        - testing/web-platform/tests/css/vendor-imports
+        - testing/web-platform/tests/html
+        - testing/web-platform/tests/tools/webdriver/webdriver/transport.py
+        - testing/web-platform/tests/tools/wptrunner/wptrunner/browsers/edgechromium.py
+        - testing/web-platform/tests/tools/wptrunner/wptrunner/executors/executoredgechromium.py
+        - testing/web-platform/tests/tools/wptrunner/wptrunner/manifestupdate.py
+        - testing/web-platform/tests/tools/wptrunner/wptrunner/metadata.py
+        - testing/web-platform/tests/tools/wptrunner/wptrunner/tests/test_update.py
+        - testing/web-platform/tests/tools/lint/tests/dummy/broken.html
+        - testing/web-platform/tests/tools/lint/tests/dummy/broken_ignored.html
+        - toolkit/components/telemetry/build_scripts/setup.py
+        - toolkit/components/telemetry/tests/marionette/mach_commands.py
+        - toolkit/content/tests/chrome
+        - toolkit/mozapps/installer/windows/nsis/preprocess-locale.py
+        - tools/jprof/README.html
+        - tools/lint/eslint
+        - view/crashtests
+        - widget/cocoa/crashtests
+        - widget/nsFilePickerProxy.cpp
+        - widget/tests
+        - widget/windows/tests/TestUrisToValidate.h
+        - xpcom/reflect/xptcall/porting.html
+        - xpcom/reflect/xptcall/status.html
+        - xpcom/tests/test.properties
+        - xpcom/tests/unit/data/bug121341.properties
+        # Excluded below files because tests were failing unexpectedly
+        - dom/bindings/test/test_barewordGetsWindow.html
+        - devtools/client/styleeditor/test/sourcemap-css/sourcemaps.css
+        - devtools/client/styleeditor/test/sourcemap-css/contained.css
+        - devtools/client/styleeditor/test/sourcemap-css/test-stylus.css
+        - dom/bindings/test/file_barewordGetsWindow_frame1.html
+        - dom/bindings/test/file_barewordGetsWindow_frame2.html
+    extensions:
+        - .c
+        - .cc
+        - .cpp
+        - .css
+        - .dtd
+        - .ftl
+        - .h
+        - .html
+        - .py
+        - .properties
+        - .rs
+        - .xhtml
+    support-files:
+        - 'tools/lint/file-whitespace/**'
+    type: external
+    payload: file-whitespace:lint
diff --git a/tools/lint/file-whitespace/__init__.py b/tools/lint/file-whitespace/__init__.py
new file mode 100644
index 0000000000..f323d29db9
--- /dev/null
+++ b/tools/lint/file-whitespace/__init__.py
@@ -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/.
+
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+results = []
+
+
+def lint(paths, config, fix=None, **lintargs):
+    files = list(expand_exclusions(paths, config, lintargs["root"]))
+    log = lintargs["log"]
+
+    for f in files:
+        with open(f, "rb") as open_file:
+            hasFix = False
+            content_to_write = []
+
+            try:
+                lines = open_file.readlines()
+                # Check for Empty spaces or newline character at end of file
+                if lines[:].__len__() != 0 and lines[-1:][0].strip().__len__() == 0:
+                    # return file pointer to first
+                    open_file.seek(0)
+                    if fix:
+                        # fix Empty lines at end of file
+                        for i, line in reversed(list(enumerate(open_file))):
+                            # determine if line is empty
+                            if line.strip() != b"":
+                                with open(f, "wb") as write_file:
+                                    # determine if file's last line have \n, if not then add a \n
+                                    if not lines[i].endswith(b"\n"):
+                                        lines[i] = lines[i] + b"\n"
+                                    # write content to file
+                                    for e in lines[: i + 1]:
+                                        write_file.write(e)
+                                # end the loop
+                                break
+                    else:
+                        res = {
+                            "path": f,
+                            "message": "Empty Lines at end of file",
+                            "level": "error",
+                            "lineno": open_file.readlines()[:].__len__(),
+                        }
+                        results.append(result.from_config(config, **res))
+            except Exception as ex:
+                log.debug("Error: " + str(ex) + ", in file: " + f)
+
+            # return file pointer to first
+            open_file.seek(0)
+
+            lines = open_file.readlines()
+            # Detect missing newline at the end of the file
+            if lines[:].__len__() != 0 and not lines[-1].endswith(b"\n"):
+                if fix:
+                    with open(f, "wb") as write_file:
+                        # add a newline character at end of file
+                        lines[-1] = lines[-1] + b"\n"
+                        # write content to file
+                        for e in lines:
+                            write_file.write(e)
+                else:
+                    res = {
+                        "path": f,
+                        "message": "File does not end with newline character",
+                        "level": "error",
+                        "lineno": lines.__len__(),
+                    }
+                    results.append(result.from_config(config, **res))
+
+            # return file pointer to first
+            open_file.seek(0)
+
+            for i, line in enumerate(open_file):
+                if line.endswith(b" \n"):
+                    # We found a trailing whitespace
+                    if fix:
+                        # We want to fix it, strip the trailing spaces
+                        content_to_write.append(line.rstrip() + b"\n")
+                        hasFix = True
+                    else:
+                        res = {
+                            "path": f,
+                            "message": "Trailing whitespace",
+                            "level": "error",
+                            "lineno": i + 1,
+                        }
+                        results.append(result.from_config(config, **res))
+                else:
+                    if fix:
+                        content_to_write.append(line)
+            if hasFix:
+                # Only update the file when we found a change to make
+                with open(f, "wb") as open_file_to_write:
+                    open_file_to_write.write(b"".join(content_to_write))
+
+            # We are still using the same fp, let's return to the first
+            # line
+            open_file.seek(0)
+            # Open it as once as we just need to know if there is
+            # at least one \r\n
+            content = open_file.read()
+
+            if b"\r\n" in content:
+                if fix:
+                    # replace \r\n by \n
+                    content = content.replace(b"\r\n", b"\n")
+                    with open(f, "wb") as open_file_to_write:
+                        open_file_to_write.write(content)
+                else:
+                    res = {
+                        "path": f,
+                        "message": "Windows line return",
+                        "level": "error",
+                    }
+                    results.append(result.from_config(config, **res))
+
+    return results
diff --git a/tools/lint/flake8.yml b/tools/lint/flake8.yml
new file mode 100644
index 0000000000..aff6449cec
--- /dev/null
+++ b/tools/lint/flake8.yml
@@ -0,0 +1,13 @@
+---
+flake8:
+    description: Python linter
+    # Excludes should be added to topsrcdir/.flake8.
+    exclude: []
+    # The configure option is used by the build system
+    extensions: ['configure', 'py']
+    support-files:
+        - '**/.flake8'
+        - 'tools/lint/python/flake8*'
+    type: external
+    payload: python.flake8:lint
+    setup: python.flake8:setup
diff --git a/tools/lint/hooks.py b/tools/lint/hooks.py
new file mode 100755
index 0000000000..cb5c9dc2e0
--- /dev/null
+++ b/tools/lint/hooks.py
@@ -0,0 +1,64 @@
+#!/usr/bin/env python
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import absolute_import, print_function
+
+import os
+import signal
+import six
+import subprocess
+import sys
+from distutils.spawn import find_executable
+
+here = os.path.dirname(os.path.realpath(__file__))
+topsrcdir = os.path.join(here, os.pardir, os.pardir)
+
+
+def run_process(cmd):
+    proc = subprocess.Popen(cmd)
+
+    # ignore SIGINT, the mozlint subprocess should exit quickly and gracefully
+    orig_handler = signal.signal(signal.SIGINT, signal.SIG_IGN)
+    proc.wait()
+    signal.signal(signal.SIGINT, orig_handler)
+    return proc.returncode
+
+
+def run_mozlint(hooktype, args):
+    if isinstance(hooktype, six.binary_type):
+        hooktype = hooktype.decode("UTF-8", "replace")
+    # --quiet prevents warnings on eslint, it will be ignored by other linters
+    python = find_executable("python3")
+    if not python:
+        print("error: Python 3 not detected on your system! Please install it.")
+        sys.exit(1)
+
+    cmd = [python, os.path.join(topsrcdir, "mach"), "lint", "--quiet"]
+
+    if "commit" in hooktype:
+        # don't prevent commits, just display the lint results
+        run_process(cmd + ["--workdir=staged"])
+        return False
+    elif "push" in hooktype:
+        return run_process(cmd + ["--outgoing"] + args)
+
+    print("warning: '{}' is not a valid mozlint hooktype".format(hooktype))
+    return False
+
+
+def hg(ui, repo, **kwargs):
+    hooktype = kwargs["hooktype"]
+    return run_mozlint(hooktype, kwargs.get("pats", []))
+
+
+def git():
+    hooktype = os.path.basename(__file__)
+    if hooktype == "hooks.py":
+        hooktype = "pre-push"
+    return run_mozlint(hooktype, [])
+
+
+if __name__ == "__main__":
+    sys.exit(git())
diff --git a/tools/lint/hooks_clang_format.py b/tools/lint/hooks_clang_format.py
new file mode 100755
index 0000000000..a239eebe4c
--- /dev/null
+++ b/tools/lint/hooks_clang_format.py
@@ -0,0 +1,95 @@
+#!/usr/bin/env python3
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import subprocess
+from subprocess import check_output, CalledProcessError
+import sys
+
+here = os.path.dirname(os.path.realpath(__file__))
+topsrcdir = os.path.join(here, os.pardir, os.pardir)
+
+EXTRA_PATHS = (
+    "python/mozversioncontrol",
+    "python/mozbuild",
+    "testing/mozbase/mozfile",
+)
+sys.path[:0] = [os.path.join(topsrcdir, p) for p in EXTRA_PATHS]
+
+from mozversioncontrol import get_repository_object, InvalidRepoPath
+
+
+def run_clang_format(hooktype, changedFiles):
+    try:
+        vcs = get_repository_object(topsrcdir)
+    except InvalidRepoPath:
+        return
+
+    if not changedFiles:
+        # No files have been touched
+        return
+
+    # We have also a copy of this list in:
+    # python/mozbuild/mozbuild/mach_commands.py
+    # version-control-tools/hgext/clang-format/__init__.py
+    # release-services/src/staticanalysis/bot/static_analysis_bot/config.py
+    # Too heavy to import the full class just for this variable
+    extensions = (".cpp", ".c", ".cc", ".h", ".m", ".mm")
+    path_list = []
+    for filename in sorted(changedFiles):
+        # Ignore files unsupported in clang-format
+        if filename.decode().endswith(extensions):
+            path_list.append(filename)
+
+    if not path_list:
+        # No files have been touched
+        return
+
+    arguments = ["clang-format", "-p"] + path_list
+    # On windows we need this to call the command in a shell, see Bug 1511594
+    if os.name == "nt":
+        clang_format_cmd = ["sh", "mach"] + arguments
+    else:
+        clang_format_cmd = [os.path.join(topsrcdir, "mach")] + arguments
+    if "commit" in hooktype:
+        # don't prevent commits, just display the clang-format results
+        subprocess.call(clang_format_cmd)
+
+        vcs.add_remove_files(*path_list)
+
+        return False
+    print("warning: '{}' is not a valid clang-format hooktype".format(hooktype))
+    return False
+
+
+def hg(ui, repo, node, **kwargs):
+    print(
+        "warning: this hook has been deprecated. Please use the hg extension instead.\n"
+        "please add 'clang-format = ~/.mozbuild/version-control-tools/hgext/clang-format'"
+        " to hgrc\n"
+        "Or run 'mach bootstrap'"
+    )
+    return False
+
+
+def git():
+    hooktype = os.path.basename(__file__)
+    if hooktype == "hooks_clang_format.py":
+        hooktype = "pre-push"
+
+    try:
+        changedFiles = check_output(
+            ["git", "diff", "--staged", "--diff-filter=d", "--name-only", "HEAD"]
+        ).split()
+        # TODO we should detect if we are in a "add -p" mode and show a warning
+        return run_clang_format(hooktype, changedFiles)
+
+    except CalledProcessError:
+        print("Command to retrieve local files failed")
+        return 1
+
+
+if __name__ == "__main__":
+    sys.exit(git())
diff --git a/tools/lint/hooks_js_format.py b/tools/lint/hooks_js_format.py
new file mode 100755
index 0000000000..7af4ea9243
--- /dev/null
+++ b/tools/lint/hooks_js_format.py
@@ -0,0 +1,80 @@
+#!/usr/bin/env python3
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import subprocess
+from subprocess import check_output, CalledProcessError
+import sys
+
+here = os.path.dirname(os.path.realpath(__file__))
+topsrcdir = os.path.join(here, os.pardir, os.pardir)
+
+EXTRA_PATHS = (
+    "python/mozversioncontrol",
+    "python/mozbuild",
+    "testing/mozbase/mozfile",
+)
+sys.path[:0] = [os.path.join(topsrcdir, p) for p in EXTRA_PATHS]
+
+from mozversioncontrol import get_repository_object, InvalidRepoPath
+
+
+def run_js_format(hooktype, changedFiles):
+    try:
+        vcs = get_repository_object(topsrcdir)
+    except InvalidRepoPath:
+        return
+
+    if not changedFiles:
+        # No files have been touched
+        return
+
+    extensions = (".js", ".jsx", ".jsm")
+    path_list = []
+    for filename in sorted(changedFiles):
+        # Ignore files unsupported in eslint and prettier
+        if filename.decode().endswith(extensions):
+            path_list.append(filename)
+
+    if not path_list:
+        # No files have been touched
+        return
+
+    arguments = ["eslint", "--fix"] + path_list
+    # On windows we need this to call the command in a shell, see Bug 1511594
+    if os.name == "nt":
+        js_format_cmd = ["sh", "mach"] + arguments
+    else:
+        js_format_cmd = [os.path.join(topsrcdir, "mach")] + arguments
+    if "commit" in hooktype:
+        # don't prevent commits, just display the eslint and prettier results
+        subprocess.call(js_format_cmd)
+
+        vcs.add_remove_files(*path_list)
+
+        return False
+    print("warning: '{}' is not a valid js-format hooktype".format(hooktype))
+    return False
+
+
+def git():
+    hooktype = os.path.basename(__file__)
+    if hooktype == "hooks_js_format.py":
+        hooktype = "pre-push"
+
+    try:
+        changedFiles = check_output(
+            ["git", "diff", "--staged", "--diff-filter=d", "--name-only", "HEAD"]
+        ).split()
+        # TODO we should detect if we are in a "add -p" mode and show a warning
+        return run_js_format(hooktype, changedFiles)
+
+    except CalledProcessError:
+        print("Command to retrieve local files failed")
+        return 1
+
+
+if __name__ == "__main__":
+    sys.exit(git())
diff --git a/tools/lint/l10n.yml b/tools/lint/l10n.yml
new file mode 100644
index 0000000000..33c9bbcdf0
--- /dev/null
+++ b/tools/lint/l10n.yml
@@ -0,0 +1,39 @@
+---
+l10n:
+    description: Localization linter
+    # list of include directories of both
+    # browser and mobile/android l10n.tomls
+    include:
+        - browser/branding/official/locales/en-US
+        - browser/extensions/formautofill/locales/en-US
+        - browser/extensions/report-site-issue/locales/en-US
+        - browser/locales/en-US
+        - devtools/client/locales/en-US
+        - devtools/shared/locales/en-US
+        - devtools/startup/locales/en-US
+        - dom/locales/en-US
+        - mobile/android/locales/en-US
+        - mobile/locales/en-US
+        - netwerk/locales/en-US
+        - security/manager/locales/en-US
+        - services/sync/locales/en-US
+        - toolkit/locales/en-US
+        - tools/lint/l10n.yml
+    # files not supported by compare-locales,
+    # and also not relevant to this linter
+    exclude:
+        - browser/locales/en-US/firefox-l10n.js
+        - mobile/android/locales/en-US/mobile-l10n.js
+        - toolkit/locales/en-US/chrome/global/intl.css
+    l10n_configs:
+        - browser/locales/l10n.toml
+        - mobile/android/locales/l10n.toml
+    type: external
+    payload: python.l10n_lint:lint
+    setup: python.l10n_lint:gecko_strings_setup
+    support-files:
+        - '**/l10n.toml'
+        - 'third_party/python/compare-locales/**'
+        - 'third_party/python/fluent/**'
+        - 'tools/lint/python/l10n_lint.py'
+        - 'tools/lint/l10n.yml'
diff --git a/tools/lint/libpref/__init__.py b/tools/lint/libpref/__init__.py
new file mode 100644
index 0000000000..66551c6fbb
--- /dev/null
+++ b/tools/lint/libpref/__init__.py
@@ -0,0 +1,112 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import absolute_import, print_function, division
+import re
+import sys
+import yaml
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+# This simple linter checks for duplicates from
+# modules/libpref/init/StaticPrefList.yaml against modules/libpref/init/all.js
+
+# If for any reason a pref needs to appear in both files, add it to this set.
+IGNORE_PREFS = {
+    "devtools.console.stdout.chrome",  # Uses the 'sticky' attribute.
+    "devtools.console.stdout.content",  # Uses the 'sticky' attribute.
+    "fission.autostart",  # Uses the 'locked' attribute.
+    "browser.dom.window.dump.enabled",  # Uses the 'sticky' attribute.
+    "apz.fling_curve_function_y2",  # This pref is a part of a series.
+    "dom.postMessage.sharedArrayBuffer.bypassCOOP_COEP.insecure.enabled",  # NOQA: E501; Uses the 'locked' attribute.
+}
+PATTERN = re.compile(r"\s*pref\(\s*\"(?P<pref>.+)\"\s*,\s*(?P<val>.+)\)\s*;.*")
+
+
+def get_names(pref_list_filename):
+    pref_names = {}
+    # We want to transform patterns like 'foo: @VAR@' into valid yaml. This
+    # pattern does not happen in 'name', so it's fine to ignore these.
+    # We also want to evaluate all branches of #ifdefs for pref names, so we
+    # ignore anything else preprocessor related.
+    file = open(pref_list_filename).read().replace("@", "")
+    try:
+        pref_list = yaml.safe_load(file)
+    except (IOError, ValueError) as e:
+        print("{}: error:\n  {}".format(pref_list_filename, e), file=sys.stderr)
+        sys.exit(1)
+
+    for pref in pref_list:
+        if pref["name"] not in IGNORE_PREFS:
+            pref_names[pref["name"]] = pref["value"]
+
+    return pref_names
+
+
+# Check the names of prefs against each other, and if the pref is a duplicate
+# that has not previously been noted, add that name to the list of errors.
+def check_against(path, pref_names):
+    errors = []
+    prefs = read_prefs(path)
+    for pref in prefs:
+        if pref["name"] in pref_names:
+            errors.extend(check_value_for_pref(pref, pref_names[pref["name"]], path))
+    return errors
+
+
+def check_value_for_pref(some_pref, some_value, path):
+    errors = []
+    if some_pref["value"] == some_value:
+        errors.append(
+            {
+                "path": path,
+                "message": some_pref["raw"],
+                "lineno": some_pref["line"],
+                "hint": "Remove the duplicate pref or add it to IGNORE_PREFS.",
+                "level": "error",
+            }
+        )
+    return errors
+
+
+# The entries in the *.js pref files are regular enough to use simple pattern
+# matching to load in prefs.
+def read_prefs(path):
+    prefs = []
+    with open(path) as source:
+        for lineno, line in enumerate(source, start=1):
+            match = PATTERN.match(line)
+            if match:
+                prefs.append(
+                    {
+                        "name": match.group("pref"),
+                        "value": evaluate_pref(match.group("val")),
+                        "line": lineno,
+                        "raw": line,
+                    }
+                )
+    return prefs
+
+
+def evaluate_pref(value):
+    bools = {"true": True, "false": False}
+    if value in bools:
+        return bools[value]
+    elif value.isdigit():
+        return int(value)
+    return value
+
+
+def checkdupes(paths, config, **kwargs):
+    results = []
+    errors = []
+    pref_names = get_names(config["support-files"][0])
+    files = list(expand_exclusions(paths, config, kwargs["root"]))
+    for file in files:
+        errors.extend(check_against(file, pref_names))
+    for error in errors:
+        results.append(result.from_config(config, **error))
+    return results
diff --git a/tools/lint/license.yml b/tools/lint/license.yml
new file mode 100644
index 0000000000..ca5c6c7834
--- /dev/null
+++ b/tools/lint/license.yml
@@ -0,0 +1,88 @@
+---
+license:
+    description: License Check
+    include:
+        - .
+    exclude:
+        # These paths need to be triaged.
+        - build/pgo/js-input
+        # License not super clear
+        - browser/branding/
+        # Trademark
+        - browser/components/pocket/content/panels/
+        - toolkit/components/pdfjs/content/web/images/
+        # We probably want a specific license
+        - browser/extensions/webcompat/injections/
+        # Different license
+        - build/pgo/blueprint/print.css
+        # Different license
+        - build/pgo/blueprint/screen.css
+        # Empty files
+        - config/external/nspr/_pl_bld.h
+        - config/external/nspr/_pr_bld.h
+        # Unknown origin
+        - gfx/2d/MMIHelpers.h
+        # might not work with license
+        - gradle.properties
+        # might not work with license
+        - gradle/wrapper/gradle-wrapper.properties
+        # tests
+        - js/src/devtools/rootAnalysis/t/
+        - mobile/android/components/extensions
+        - mobile/android/geckoview/src/main/AndroidManifest.xml
+        - mobile/android/geckoview/src/main/AndroidManifest_overlay.jinja
+        - mobile/android/geckoview/src/main/res/drawable/ic_generic_file.xml
+        - mobile/android/geckoview_example/src/main
+        # might not work with license
+        - mobile/android/gradle/dotgradle-offline/gradle.properties
+        # might not work with license
+        - mobile/android/gradle/dotgradle-online/gradle.properties
+        # Almost empty file
+        - modules/libpref/greprefs.js
+        - parser/html/java/named-character-references.html
+        - python/mozlint/test/files/
+        # By design
+        - python/mozrelease/mozrelease
+        - security/mac/hardenedruntime/browser.developer.entitlements.xml
+        - security/mac/hardenedruntime/browser.production.entitlements.xml
+        - security/mac/hardenedruntime/developer.entitlements.xml
+        - security/mac/hardenedruntime/plugin-container.developer.entitlements.xml
+        - security/mac/hardenedruntime/plugin-container.production.entitlements.xml
+        - security/mac/hardenedruntime/production.entitlements.xml
+        - servo/components/hashglobe/src/alloc.rs
+        - servo/components/hashglobe/src/shim.rs
+        - testing/marionette/harness/marionette_harness/www/
+        # Browsertime can't handle this script when there's a comment at the top
+        - testing/raptor/browsertime/browsertime_benchmark.js
+        - toolkit/components/reputationservice/chromium/chrome/common/safe_browsing/csd.pb.cc
+        - toolkit/components/reputationservice/chromium/chrome/common/safe_browsing/csd.pb.h
+        - toolkit/mozapps/update/updater/crctable.h
+        - tools/lint/eslint/eslint-plugin-mozilla/lib/configs
+        # By design
+        - tools/lint/test/
+    extensions:
+        - .c
+        - .cc
+        - .cpp
+        - .css
+        - .dtd
+        - .ftl
+        - .h
+        - .html
+        - .js
+        - .jsm
+        - .jsx
+        - .m
+        - .mm
+        - .properties
+        - .py
+        - .rs
+        - .svg
+        - .xhtml
+        - .xml
+        - .xul
+    support-files:
+        - 'tools/lint/license/**'
+    type: external
+    payload: license:lint
+    find-dotfiles: true
diff --git a/tools/lint/license/__init__.py b/tools/lint/license/__init__.py
new file mode 100644
index 0000000000..46f7aa68ea
--- /dev/null
+++ b/tools/lint/license/__init__.py
@@ -0,0 +1,191 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+here = os.path.abspath(os.path.dirname(__file__))
+
+results = []
+
+# Official source: https://www.mozilla.org/en-US/MPL/headers/
+TEMPLATES = {
+    "mpl2_license": """
+    This Source Code Form is subject to the terms of the Mozilla Public
+    License, v. 2.0. If a copy of the MPL was not distributed with this
+    file, You can obtain one at http://mozilla.org/MPL/2.0/.
+    """.strip().splitlines(),
+    "public_domain_license": """
+    Any copyright is dedicated to the public domain.
+    http://creativecommons.org/publicdomain/zero/1.0/
+    """.strip().splitlines(),
+}
+license_list = os.path.join(here, "valid-licenses.txt")
+
+
+def load_valid_license():
+    """
+    Load the list of license patterns
+    """
+    with open(license_list) as f:
+        l = f.readlines()
+        # Remove the empty lines
+        return list(filter(bool, [x.replace("\n", "") for x in l]))
+
+
+def is_valid_license(licenses, filename):
+    """
+    From a given file, check if we can find the license patterns
+    in the X first lines of the file
+    """
+    with open(filename, "r", errors="replace") as myfile:
+        contents = myfile.read()
+        # Empty files don't need a license.
+        if not contents:
+            return True
+
+        for l in licenses:
+            if l.lower().strip() in contents.lower():
+                return True
+    return False
+
+
+def add_header(log, filename, header):
+    """
+    Add the header to the top of the file
+    """
+    header.append("\n")
+    with open(filename, "r+") as f:
+        # lines in list format
+        try:
+            lines = f.readlines()
+        except UnicodeDecodeError as e:
+            log.debug("Could not read file '{}'".format(f))
+            log.debug("Error: {}".format(e))
+            return
+
+        i = 0
+        if lines:
+            # if the file isn't empty (__init__.py can be empty files)
+            if lines[0].startswith("#!") or lines[0].startswith("<?xml "):
+                i = 1
+
+            if lines[0].startswith("/* -*- Mode"):
+                i = 2
+        # Insert in the top of the data structure
+        lines[i:i] = header
+        f.seek(0, 0)
+        f.write("".join(lines))
+
+
+def is_test(f):
+    """
+    is the file a test or not?
+    """
+    if "lint/test/" in f:
+        # For the unit tests
+        return False
+    return (
+        "/tests/" in f
+        or "/test/" in f
+        or "/test_" in f
+        or "/gtest" in f
+        or "/crashtest" in f
+        or "/mochitest" in f
+        or "/reftest" in f
+        or "/imptest" in f
+        or "/androidTest" in f
+        or "/jit-test/" in f
+        or "jsapi-tests/" in f
+    )
+
+
+def fix_me(log, filename):
+    """
+    Add the copyright notice to the top of the file
+    """
+    _, ext = os.path.splitext(filename)
+    license = []
+
+    license_template = TEMPLATES["mpl2_license"]
+    test = False
+
+    if is_test(filename):
+        license_template = TEMPLATES["public_domain_license"]
+        test = True
+
+    if ext in [
+        ".cpp",
+        ".c",
+        ".cc",
+        ".h",
+        ".m",
+        ".mm",
+        ".rs",
+        ".js",
+        ".jsm",
+        ".jsx",
+        ".css",
+    ]:
+        for i, l in enumerate(license_template):
+            start = " "
+            end = ""
+            if i == 0:
+                # first line, we have the /*
+                start = "/"
+            if i == len(license_template) - 1:
+                # Last line, we end by */
+                end = " */"
+            license.append(start + "* " + l.strip() + end + "\n")
+
+        add_header(log, filename, license)
+        return
+
+    if ext in [".py", ".ftl", ".properties"] or filename.endswith(".inc.xul"):
+        for l in license_template:
+            license.append("# " + l.strip() + "\n")
+        add_header(log, filename, license)
+        return
+
+    if ext in [".xml", ".xul", ".html", ".xhtml", ".dtd", ".svg"]:
+        for i, l in enumerate(license_template):
+            start = "   - "
+            end = ""
+            if i == 0:
+                # first line, we have the <!--
+                start = "<!-- "
+            if i == 2 or (i == 1 and test):
+                # Last line, we end by -->
+                end = " -->"
+            license.append(start + l.strip() + end)
+            if ext != ".svg" or end == "":
+                # When dealing with an svg, we should not have a space between
+                # the license and the content
+                license.append("\n")
+        add_header(log, filename, license)
+        return
+
+
+def lint(paths, config, fix=None, **lintargs):
+    log = lintargs["log"]
+    files = list(expand_exclusions(paths, config, lintargs["root"]))
+
+    licenses = load_valid_license()
+
+    for f in files:
+        if is_test(f):
+            # For now, do not do anything with test (too many)
+            continue
+        if not is_valid_license(licenses, f):
+            res = {
+                "path": f,
+                "message": "No matching license strings found in tools/lint/license/valid-licenses.txt",  # noqa
+                "level": "error",
+            }
+            results.append(result.from_config(config, **res))
+            if fix:
+                fix_me(log, f)
+    return results
diff --git a/tools/lint/license/valid-licenses.txt b/tools/lint/license/valid-licenses.txt
new file mode 100644
index 0000000000..d881b095d4
--- /dev/null
+++ b/tools/lint/license/valid-licenses.txt
@@ -0,0 +1,27 @@
+mozilla.org/MPL/
+Licensed under the Apache License, Version 2.0
+copyright is dedicated to the Public Domain.
+under the MIT
+Redistributions of source code must retain the above copyright
+Use of this source code is governed by a BSD-style license
+The author disclaims copyright to this source code.
+The author hereby disclaims copyright to this source code
+Use, Modification and Redistribution (including distribution of any
+author grants irrevocable permission to anyone to use, modify,
+THIS FILE IS AUTO-GENERATED
+Permission is hereby granted, free of charge, to any person obtaining
+Permission to use, copy, modify,
+License: Public domain. You are free to use this code however you
+You are granted a license to use, reproduce and create derivative works
+GENERATED FILE, DO NOT EDIT
+This code is governed by the BSD license
+This Source Code Form is subject to the terms of the Apache License
+DO NOT EDIT
+This program is made available under an ISC-style license.
+under MIT license
+License MIT per upstream
+DO NOT MODIFY
+GNU General Public License
+FILE IS GENERATED
+Generated by
+do not edit
diff --git a/tools/lint/lintpref.yml b/tools/lint/lintpref.yml
new file mode 100644
index 0000000000..cb58d642bc
--- /dev/null
+++ b/tools/lint/lintpref.yml
@@ -0,0 +1,17 @@
+---
+lintpref:
+    description: Linter for static prefs.
+    include:
+        - 'modules/libpref/init'
+        - 'browser/app/profile/'
+        - 'mobile/android/app/'
+        - 'devtools/client/preferences/'
+        - 'browser/branding/'
+        - 'mobile/android/installer/'
+        - 'mobile/android/locales/'
+    exclude: []
+    extensions: ['js']
+    type: external
+    payload: libpref:checkdupes
+    support-files:
+        - 'modules/libpref/init/StaticPrefList.yaml'
diff --git a/tools/lint/mach_commands.py b/tools/lint/mach_commands.py
new file mode 100644
index 0000000000..9a424de24d
--- /dev/null
+++ b/tools/lint/mach_commands.py
@@ -0,0 +1,136 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import argparse
+import copy
+import os
+
+from mozbuild.base import (
+    BuildEnvironmentNotFoundException,
+    MachCommandBase,
+)
+
+
+from mach.decorators import (
+    CommandArgument,
+    CommandProvider,
+    Command,
+)
+
+
+here = os.path.abspath(os.path.dirname(__file__))
+EXCLUSION_FILES = [
+    os.path.join("tools", "rewriting", "Generated.txt"),
+    os.path.join("tools", "rewriting", "ThirdPartyPaths.txt"),
+]
+
+EXCLUSION_FILES_OPTIONAL = []
+thunderbird_excludes = os.path.join("comm", "tools", "lint", "GlobalExclude.txt")
+if os.path.exists(thunderbird_excludes):
+    EXCLUSION_FILES_OPTIONAL.append(thunderbird_excludes)
+
+GLOBAL_EXCLUDES = [
+    "node_modules",
+    "tools/lint/test/files",
+]
+
+
+def setup_argument_parser():
+    from mozlint import cli
+
+    return cli.MozlintParser()
+
+
+def get_global_excludes(topsrcdir):
+    # exclude misc paths
+    excludes = GLOBAL_EXCLUDES[:]
+
+    # exclude top level paths that look like objdirs
+    excludes.extend(
+        [
+            name
+            for name in os.listdir(topsrcdir)
+            if name.startswith("obj") and os.path.isdir(name)
+        ]
+    )
+
+    for path in EXCLUSION_FILES + EXCLUSION_FILES_OPTIONAL:
+        with open(os.path.join(topsrcdir, path), "r") as fh:
+            excludes.extend([f.strip() for f in fh.readlines()])
+
+    return excludes
+
+
+@CommandProvider
+class MachCommands(MachCommandBase):
+    @Command(
+        "lint",
+        category="devenv",
+        description="Run linters.",
+        parser=setup_argument_parser,
+    )
+    def lint(self, *runargs, **lintargs):
+        """Run linters."""
+        self.activate_virtualenv()
+        from mozlint import cli, parser
+
+        try:
+            buildargs = {}
+            buildargs["substs"] = copy.deepcopy(dict(self.substs))
+            buildargs["defines"] = copy.deepcopy(dict(self.defines))
+            buildargs["topobjdir"] = self.topobjdir
+            lintargs.update(buildargs)
+        except BuildEnvironmentNotFoundException:
+            pass
+
+        lintargs.setdefault("root", self.topsrcdir)
+        lintargs["exclude"] = get_global_excludes(lintargs["root"])
+        lintargs["config_paths"].insert(0, here)
+        lintargs["virtualenv_bin_path"] = self.virtualenv_manager.bin_path
+        lintargs["virtualenv_manager"] = self.virtualenv_manager
+        for path in EXCLUSION_FILES:
+            parser.GLOBAL_SUPPORT_FILES.append(os.path.join(self.topsrcdir, path))
+        return cli.run(*runargs, **lintargs)
+
+    @Command(
+        "eslint",
+        category="devenv",
+        description="Run eslint or help configure eslint for optimal development.",
+    )
+    @CommandArgument(
+        "paths",
+        default=None,
+        nargs="*",
+        help="Paths to file or directories to lint, like "
+        "'browser/' Defaults to the "
+        "current directory if not given.",
+    )
+    @CommandArgument(
+        "-s",
+        "--setup",
+        default=False,
+        action="store_true",
+        help="Configure eslint for optimal development.",
+    )
+    @CommandArgument("-b", "--binary", default=None, help="Path to eslint binary.")
+    @CommandArgument(
+        "--fix",
+        default=False,
+        action="store_true",
+        help="Request that eslint automatically fix errors, where possible.",
+    )
+    @CommandArgument(
+        "extra_args",
+        nargs=argparse.REMAINDER,
+        help="Extra args that will be forwarded to eslint.",
+    )
+    def eslint(self, paths, extra_args=[], **kwargs):
+        self._mach_context.commands.dispatch(
+            "lint",
+            self._mach_context,
+            linters=["eslint"],
+            paths=paths,
+            argv=extra_args,
+            **kwargs
+        )
diff --git a/tools/lint/mingw-capitalization.yml b/tools/lint/mingw-capitalization.yml
new file mode 100644
index 0000000000..04c9c79e16
--- /dev/null
+++ b/tools/lint/mingw-capitalization.yml
@@ -0,0 +1,12 @@
+---
+mingw-capitalization:
+    description: >
+      "A Windows include file is not lowercase, and may break the MinGW build"
+    extensions: ['h', 'cpp', 'cc', 'c']
+    include: ['.']
+    exclude:
+        # We do not compile WebRTC with MinGW yet
+        - media/webrtc
+    type: external
+    level: error
+    payload: cpp.mingw-capitalization:lint
diff --git a/tools/lint/perfdocs.yml b/tools/lint/perfdocs.yml
new file mode 100644
index 0000000000..51a35e65a9
--- /dev/null
+++ b/tools/lint/perfdocs.yml
@@ -0,0 +1,10 @@
+---
+perfdocs:
+    description: Performance Documentation linter
+    # This task handles its own search, so just include cwd
+    include: ['testing/raptor', 'python/mozperftest', 'testing/talos']
+    exclude: []
+    extensions: ['rst', 'ini', 'yml']
+    support-files: []
+    type: structured_log
+    payload: perfdocs:lint
diff --git a/tools/lint/perfdocs/__init__.py b/tools/lint/perfdocs/__init__.py
new file mode 100644
index 0000000000..1194d38624
--- /dev/null
+++ b/tools/lint/perfdocs/__init__.py
@@ -0,0 +1,13 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import os
+
+from perfdocs import perfdocs
+
+here = os.path.abspath(os.path.dirname(__file__))
+PERFDOCS_REQUIREMENTS_PATH = os.path.join(here, "requirements.txt")
+
+
+def lint(paths, config, logger, fix=False, **lintargs):
+    return perfdocs.run_perfdocs(config, logger=logger, paths=paths, generate=fix)
diff --git a/tools/lint/perfdocs/framework_gatherers.py b/tools/lint/perfdocs/framework_gatherers.py
new file mode 100644
index 0000000000..29d34c2d00
--- /dev/null
+++ b/tools/lint/perfdocs/framework_gatherers.py
@@ -0,0 +1,258 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+from __future__ import absolute_import
+
+import collections
+import os
+import pathlib
+import re
+
+from manifestparser import TestManifest
+from mozperftest.script import ScriptInfo
+from perfdocs.utils import read_yaml
+from perfdocs.logger import PerfDocLogger
+
+"""
+This file is for framework specific gatherers since manifests
+might be parsed differently in each of them. The gatherers
+must implement the FrameworkGatherer class.
+"""
+
+
+class FrameworkGatherer(object):
+    """
+    Abstract class for framework gatherers.
+    """
+
+    def __init__(self, yaml_path, workspace_dir):
+        """
+        Generic initialization for a framework gatherer.
+        """
+        self.workspace_dir = workspace_dir
+        self._yaml_path = yaml_path
+        self._suite_list = {}
+        self._test_list = {}
+        self._urls = {}
+        self._manifest_path = ""
+        self._manifest = None
+        self.script_infos = {}
+
+    def get_manifest_path(self):
+        """
+        Returns the path to the manifest based on the
+        manifest entry in the frameworks YAML configuration
+        file.
+
+        :return str: Path to the manifest.
+        """
+        if self._manifest_path:
+            return self._manifest_path
+
+        yaml_content = read_yaml(self._yaml_path)
+        self._manifest_path = os.path.join(self.workspace_dir, yaml_content["manifest"])
+        return self._manifest_path
+
+    def get_suite_list(self):
+        """
+        Each framework gatherer must return a dictionary with
+        the following structure. Note that the test names must
+        be relative paths so that issues can be correctly issued
+        by the reviewbot.
+
+        :return dict: A dictionary with the following structure: {
+                "suite_name": [
+                    'testing/raptor/test1',
+                    'testing/raptor/test2'
+                ]
+            }
+        """
+        raise NotImplementedError
+
+    def _build_section_with_header(self, title, content, header_type=None):
+        """
+        Adds a section to the documentation with the title as the type mentioned
+        and paragraph as content mentioned.
+        :param title: title of the section
+        :param content: content of section paragraph
+        :param header_type: type of the title heading
+        """
+        heading_map = {"H3": "=", "H4": "-", "H5": "^"}
+        return [title, heading_map.get(header_type, "^") * len(title), content, ""]
+
+
+class RaptorGatherer(FrameworkGatherer):
+    """
+    Gatherer for the Raptor framework.
+    """
+
+    def get_suite_list(self):
+        """
+        Returns a dictionary containing a mapping from suites
+        to the tests they contain.
+
+        :return dict: A dictionary with the following structure: {
+                "suite_name": [
+                    'testing/raptor/test1',
+                    'testing/raptor/test2'
+                ]
+            }
+        """
+        if self._suite_list:
+            return self._suite_list
+
+        manifest_path = self.get_manifest_path()
+
+        # Get the tests from the manifest
+        test_manifest = TestManifest([manifest_path], strict=False)
+        test_list = test_manifest.active_tests(exists=False, disabled=False)
+
+        # Parse the tests into the expected dictionary
+        for test in test_list:
+            # Get the top-level suite
+            s = os.path.basename(test["here"])
+            if s not in self._suite_list:
+                self._suite_list[s] = []
+
+            # Get the individual test
+            fpath = re.sub(".*testing", "testing", test["manifest"])
+
+            if fpath not in self._suite_list[s]:
+                self._suite_list[s].append(fpath)
+
+        return self._suite_list
+
+    def _get_subtests_from_ini(self, manifest_path, suite_name):
+        """
+        Returns a list of (sub)tests from an ini file containing the test definitions.
+
+        :param str manifest_path: path to the ini file
+        :return list: the list of the tests
+        """
+        test_manifest = TestManifest([manifest_path], strict=False)
+        test_list = test_manifest.active_tests(exists=False, disabled=False)
+        subtest_list = {}
+        for subtest in test_list:
+            subtest_list[subtest["name"]] = subtest["manifest"]
+            self._urls[subtest["name"]] = {
+                "type": suite_name,
+                "url": subtest["test_url"],
+            }
+
+        self._urls = collections.OrderedDict(
+            sorted(self._urls.items(), key=lambda t: len(t[0]))
+        )
+
+        return subtest_list
+
+    def get_test_list(self):
+        """
+        Returns a dictionary containing the tests in every suite ini file.
+
+        :return dict: A dictionary with the following structure: {
+                "suite_name": {
+                    'raptor_test1',
+                    'raptor_test2'
+                },
+            }
+        """
+        if self._test_list:
+            return self._test_list
+
+        suite_list = self.get_suite_list()
+
+        # Iterate over each manifest path from suite_list[suite_name]
+        # and place the subtests into self._test_list under the same key
+        for suite_name, manifest_paths in suite_list.items():
+            if not self._test_list.get(suite_name):
+                self._test_list[suite_name] = {}
+            for i, manifest_path in enumerate(manifest_paths, 1):
+                subtest_list = self._get_subtests_from_ini(manifest_path, suite_name)
+                self._test_list[suite_name].update(subtest_list)
+
+        return self._test_list
+
+    def build_test_description(self, title, test_description="", suite_name=""):
+        matcher = set()
+        for name, val in self._urls.items():
+            if title == name and suite_name == val["type"]:
+                matcher.add(val["url"])
+                break
+
+        if len(matcher) == 0:
+            for name, val in self._urls.items():
+                if title in name and suite_name == val["type"]:
+                    matcher.add(val["url"])
+                    break
+
+        return [
+            "* `"
+            + title
+            + " ("
+            + test_description
+            + ") "
+            + "<"
+            + matcher.pop()
+            + ">`__"
+        ]
+
+    def build_suite_section(self, title, content):
+        return self._build_section_with_header(
+            title.capitalize(), content, header_type="H4"
+        )
+
+
+class MozperftestGatherer(FrameworkGatherer):
+    """
+    Gatherer for the Mozperftest framework.
+    """
+
+    def get_test_list(self):
+        """
+        Returns a dictionary containing the tests that are in perftest.ini manifest.
+
+        :return dict: A dictionary with the following structure: {
+                "suite_name": {
+                    'perftest_test1',
+                    'perftest_test2',
+                },
+            }
+        """
+        for path in pathlib.Path(self.workspace_dir).rglob("perftest.ini"):
+            suite_name = re.sub(self.workspace_dir, "", os.path.dirname(path))
+
+            # If the workspace dir doesn't end with a forward-slash,
+            # the substitution above won't work completely
+            if suite_name.startswith("/") or suite_name.startswith("\\"):
+                suite_name = suite_name[1:]
+
+            # We have to add new paths to the logger as we search
+            # because mozperftest tests exist in multiple places in-tree
+            PerfDocLogger.PATHS.append(suite_name)
+
+            # Get the tests from perftest.ini
+            test_manifest = TestManifest([str(path)], strict=False)
+            test_list = test_manifest.active_tests(exists=False, disabled=False)
+            for test in test_list:
+                si = ScriptInfo(test["path"])
+                self.script_infos[si["name"]] = si
+                self._test_list.setdefault(suite_name, {}).update(
+                    {si["name"]: str(path)}
+                )
+
+        return self._test_list
+
+    def build_test_description(self, title, test_description="", suite_name=""):
+        return [str(self.script_infos[title])]
+
+    def build_suite_section(self, title, content):
+        return self._build_section_with_header(title, content, header_type="H4")
+
+
+class TalosGatherer(FrameworkGatherer):
+    """
+    Gatherer for the Talos framework.
+    TODO - Bug 1674220
+    """
+
+    pass
diff --git a/tools/lint/perfdocs/gatherer.py b/tools/lint/perfdocs/gatherer.py
new file mode 100644
index 0000000000..2f6a0b5e91
--- /dev/null
+++ b/tools/lint/perfdocs/gatherer.py
@@ -0,0 +1,142 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+from __future__ import absolute_import
+
+import os
+import pathlib
+import re
+
+from perfdocs.logger import PerfDocLogger
+from perfdocs.utils import read_yaml
+from perfdocs.framework_gatherers import (
+    RaptorGatherer,
+    MozperftestGatherer,
+    TalosGatherer,
+)
+
+logger = PerfDocLogger()
+
+# TODO: Implement decorator/searcher to find the classes.
+frameworks = {
+    "raptor": RaptorGatherer,
+    "mozperftest": MozperftestGatherer,
+    "Talos": TalosGatherer,
+}
+
+
+class Gatherer(object):
+    """
+    Gatherer produces the tree of the perfdoc's entries found
+    and can obtain manifest-based test lists. Used by the Verifier.
+    """
+
+    def __init__(self, workspace_dir):
+        """
+        Initialzie the Gatherer.
+
+        :param str workspace_dir: Path to the gecko checkout.
+        """
+        self.workspace_dir = workspace_dir
+        self._perfdocs_tree = []
+        self._test_list = []
+        self.framework_gatherers = {}
+
+    @property
+    def perfdocs_tree(self):
+        """
+        Returns the perfdocs_tree, and computes it
+        if it doesn't exist.
+
+        :return dict: The perfdocs tree containing all
+            framework perfdoc entries. See `fetch_perfdocs_tree`
+            for information on the data structure.
+        """
+        if self._perfdocs_tree:
+            return self._perfdocs_tree
+        else:
+            self.fetch_perfdocs_tree()
+            return self._perfdocs_tree
+
+    def fetch_perfdocs_tree(self):
+        """
+        Creates the perfdocs tree with the following structure:
+            [
+                {
+                    "path": Path to the perfdocs directory.
+                    "yml": Name of the configuration YAML file.
+                    "rst": Name of the RST file.
+                    "static": Name of the static file.
+                }, ...
+            ]
+
+        This method doesn't return anything. The result can be found in
+        the perfdocs_tree attribute.
+        """
+        exclude_dir = ["tools/lint", ".hg", "testing/perfdocs"]
+
+        for path in pathlib.Path(self.workspace_dir).rglob("perfdocs"):
+            if any(re.search(d, str(path)) for d in exclude_dir):
+                continue
+            files = [f for f in os.listdir(path)]
+            matched = {"path": str(path), "yml": "", "rst": "", "static": []}
+
+            for file in files:
+                # Add the yml/rst/static file to its key if re finds the searched file
+                if file == "config.yml" or file == "config.yaml":
+                    matched["yml"] = file
+                elif file == "index.rst":
+                    matched["rst"] = file
+                elif file.endswith(".rst"):
+                    matched["static"].append(file)
+
+            # Append to structdocs if all the searched files were found
+            if all(val for val in matched.values() if not type(val) == list):
+                self._perfdocs_tree.append(matched)
+
+        logger.log(
+            "Found {} perfdocs directories in {}".format(
+                len(self._perfdocs_tree), [d["path"] for d in self._perfdocs_tree]
+            )
+        )
+
+    def get_test_list(self, sdt_entry):
+        """
+        Use a perfdocs_tree entry to find the test list for
+        the framework that was found.
+
+        :return: A framework info dictionary with fields: {
+            'yml_path': Path to YAML,
+            'yml_content': Content of YAML,
+            'name': Name of framework,
+            'test_list': Test list found for the framework
+        }
+        """
+
+        # If it was computed before, return it
+        yaml_path = os.path.join(sdt_entry["path"], sdt_entry["yml"])
+        for entry in self._test_list:
+            if entry["yml_path"] == yaml_path:
+                return entry
+
+        # Set up framework entry with meta data
+        yaml_content = read_yaml(yaml_path)
+        framework = {
+            "yml_content": yaml_content,
+            "yml_path": yaml_path,
+            "name": yaml_content["name"],
+            "test_list": {},
+        }
+
+        # Get and then store the frameworks tests
+        self.framework_gatherers[framework["name"]] = frameworks[framework["name"]](
+            framework["yml_path"], self.workspace_dir
+        )
+
+        if not yaml_content["static-only"]:
+            framework["test_list"] = self.framework_gatherers[
+                framework["name"]
+            ].get_test_list()
+
+        self._test_list.append(framework)
+        return framework
diff --git a/tools/lint/perfdocs/generator.py b/tools/lint/perfdocs/generator.py
new file mode 100644
index 0000000000..6d3c99d00b
--- /dev/null
+++ b/tools/lint/perfdocs/generator.py
@@ -0,0 +1,251 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+from __future__ import absolute_import
+
+import os
+import re
+import shutil
+import tempfile
+
+from perfdocs.logger import PerfDocLogger
+from perfdocs.utils import are_dirs_equal, read_file, read_yaml, save_file
+
+logger = PerfDocLogger()
+
+
+class Generator(object):
+    """
+    After each perfdocs directory was validated, the generator uses the templates
+    for each framework, fills them with the test descriptions in config and saves
+    the perfdocs in the form index.rst as index file and suite_name.rst for
+    each suite of tests in the framework.
+    """
+
+    def __init__(self, verifier, workspace, generate=False):
+        """
+        Initialize the Generator.
+
+        :param verifier: Verifier object. It should not be a fresh Verifier object,
+        but an initialized one with validate_tree() method already called
+        :param workspace: Path to the top-level checkout directory.
+        :param generate: Flag for generating the documentation
+        """
+        self._workspace = workspace
+        if not self._workspace:
+            raise Exception("PerfDocs Generator requires a workspace directory.")
+        # Template documents without added information reside here
+        self.templates_path = os.path.join(
+            self._workspace, "tools", "lint", "perfdocs", "templates"
+        )
+        self.perfdocs_path = os.path.join(
+            self._workspace, "testing", "perfdocs", "generated"
+        )
+
+        self._generate = generate
+        self._verifier = verifier
+        self._perfdocs_tree = self._verifier._gatherer.perfdocs_tree
+
+    def build_perfdocs_from_tree(self):
+        """
+        Builds up a document for each framework that was found.
+
+        :return dict: A dictionary containing a mapping from each framework
+            to the document that was built for it, i.e:
+            {
+                framework_name: framework_document,
+                ...
+            }
+        """
+
+        # Using the verified `perfdocs_tree`, build up the documentation.
+        frameworks_info = {}
+        for framework in self._perfdocs_tree:
+            yaml_content = read_yaml(os.path.join(framework["path"], framework["yml"]))
+            rst_content = read_file(
+                os.path.join(framework["path"], framework["rst"]), stringify=True
+            )
+
+            # Gather all tests and descriptions and format them into
+            # documentation content
+            documentation = []
+            suites = yaml_content["suites"]
+            for suite_name in sorted(suites.keys()):
+                suite_info = suites[suite_name]
+
+                # Add the suite section
+                documentation.extend(
+                    self._verifier._gatherer.framework_gatherers[
+                        yaml_content["name"]
+                    ].build_suite_section(suite_name, suite_info["description"])
+                )
+
+                tests = suite_info.get("tests", {})
+                for test_name in sorted(tests.keys()):
+                    documentation.extend(
+                        self._verifier._gatherer.framework_gatherers[
+                            yaml_content["name"]
+                        ].build_test_description(
+                            test_name, tests[test_name], suite_name
+                        )
+                    )
+                documentation.append("")
+
+            # Insert documentation into `.rst` file
+            framework_rst = re.sub(
+                r"{documentation}", os.linesep.join(documentation), rst_content
+            )
+            frameworks_info[yaml_content["name"]] = {
+                "dynamic": framework_rst,
+                "static": [],
+            }
+
+            # For static `.rst` file
+            for static_file in framework["static"]:
+                frameworks_info[yaml_content["name"]]["static"].append(
+                    {
+                        "file": static_file,
+                        "content": read_file(
+                            os.path.join(framework["path"], static_file), stringify=True
+                        ),
+                    }
+                )
+
+        return frameworks_info
+
+    def _create_temp_dir(self):
+        """
+        Create a temp directory as preparation of saving the documentation tree.
+        :return: str the location of perfdocs_tmpdir
+        """
+        # Build the directory that will contain the final result (a tmp dir
+        # that will be moved to the final location afterwards)
+        try:
+            tmpdir = tempfile.mkdtemp()
+            perfdocs_tmpdir = os.path.join(tmpdir, "generated")
+            os.mkdir(perfdocs_tmpdir)
+        except OSError as e:
+            logger.critical("Error creating temp file: {}".format(e))
+
+        success = False or os.path.isdir(perfdocs_tmpdir)
+        if success:
+            return perfdocs_tmpdir
+        else:
+            return success
+
+    def _create_perfdocs(self):
+        """
+        Creates the perfdocs documentation.
+        :return: str path of the temp dir it is saved in
+        """
+        # All directories that are kept in the perfdocs tree are valid,
+        # so use it to build up the documentation.
+        framework_docs = self.build_perfdocs_from_tree()
+        perfdocs_tmpdir = self._create_temp_dir()
+
+        # Save the documentation files
+        frameworks = []
+        for framework_name in sorted(framework_docs.keys()):
+            frameworks.append(framework_name)
+            save_file(
+                framework_docs[framework_name]["dynamic"],
+                os.path.join(perfdocs_tmpdir, framework_name),
+            )
+
+            for static_name in framework_docs[framework_name]["static"]:
+                save_file(
+                    static_name["content"],
+                    os.path.join(perfdocs_tmpdir, static_name["file"].split(".")[0]),
+                )
+
+        # Get the main page and add the framework links to it
+        mainpage = read_file(
+            os.path.join(self.templates_path, "index.rst"), stringify=True
+        )
+        fmt_frameworks = os.linesep.join(
+            ["  * :doc:`%s`" % name for name in frameworks]
+        )
+        fmt_mainpage = re.sub(r"{test_documentation}", fmt_frameworks, mainpage)
+        save_file(fmt_mainpage, os.path.join(perfdocs_tmpdir, "index"))
+
+        return perfdocs_tmpdir
+
+    def _save_perfdocs(self, perfdocs_tmpdir):
+        """
+        Copies the perfdocs tree after it was saved into the perfdocs_tmpdir
+        :param perfdocs_tmpdir: str location of the temp dir where the
+        perfdocs was saved
+        """
+        # Remove the old docs and copy the new version there without
+        # checking if they need to be regenerated.
+        logger.log("Regenerating perfdocs...")
+
+        if os.path.exists(self.perfdocs_path):
+            shutil.rmtree(self.perfdocs_path)
+
+        try:
+            saved = shutil.copytree(perfdocs_tmpdir, self.perfdocs_path)
+            if saved:
+                logger.log(
+                    "Documentation saved to {}/".format(
+                        re.sub(".*testing", "testing", self.perfdocs_path)
+                    )
+                )
+        except Exception as e:
+            logger.critical(
+                "There was an error while saving the documentation: {}".format(e)
+            )
+
+    def generate_perfdocs(self):
+        """
+        Generate the performance documentation.
+
+        If `self._generate` is True, then the documentation will be regenerated
+        without any checks. Otherwise, if it is False, the new documentation will be
+        prepare and compare with the existing documentation to determine if
+        it should be regenerated.
+
+        :return bool: True/False - For True, if `self._generate` is True, then the
+            docs were regenerated. If `self._generate` is False, then True will mean
+            that the docs should be regenerated, and False means that they do not
+            need to be regenerated.
+        """
+
+        def get_possibly_changed_files():
+            """
+            Returns files that might have been modified
+            (used to output a linter warning for regeneration)
+            :return: list - files that might have been modified
+            """
+            # Returns files that might have been modified
+            # (used to output a linter warning for regeneration)
+            files = []
+            for entry in self._perfdocs_tree:
+                files.extend(
+                    [
+                        os.path.join(entry["path"], entry["yml"]),
+                        os.path.join(entry["path"], entry["rst"]),
+                    ]
+                )
+            return files
+
+        # Throw a warning if there's no need for generating
+        if not os.path.exists(self.perfdocs_path) and not self._generate:
+            # If they don't exist and we are not generating, then throw
+            # a linting error and exit.
+            logger.warning(
+                "PerfDocs need to be regenerated.", files=get_possibly_changed_files()
+            )
+            return True
+
+        perfdocs_tmpdir = self._create_perfdocs()
+        if self._generate:
+            self._save_perfdocs(perfdocs_tmpdir)
+        else:
+            # If we are not generating, then at least check if they
+            # should be regenerated by comparing the directories.
+            if not are_dirs_equal(perfdocs_tmpdir, self.perfdocs_path):
+                logger.warning(
+                    "PerfDocs are outdated, run ./mach lint -l perfdocs --fix` to update them.",
+                    files=get_possibly_changed_files(),
+                )
diff --git a/tools/lint/perfdocs/logger.py b/tools/lint/perfdocs/logger.py
new file mode 100644
index 0000000000..ff6321a7f1
--- /dev/null
+++ b/tools/lint/perfdocs/logger.py
@@ -0,0 +1,82 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+from __future__ import absolute_import
+
+import re
+
+
+class PerfDocLogger(object):
+    """
+    Logger for the PerfDoc tooling. Handles the warnings by outputting
+    them into through the StructuredLogger provided by lint.
+    """
+
+    TOP_DIR = ""
+    PATHS = []
+    LOGGER = None
+    FAILED = False
+
+    def __init__(self):
+        """Initializes the PerfDocLogger."""
+
+        # Set up class attributes for all logger instances
+        if not PerfDocLogger.LOGGER:
+            raise Exception(
+                "Missing linting LOGGER instance for PerfDocLogger initialization"
+            )
+        if not PerfDocLogger.PATHS:
+            raise Exception("Missing PATHS for PerfDocLogger initialization")
+        self.logger = PerfDocLogger.LOGGER
+
+    def log(self, msg):
+        """
+        Log an info message.
+
+        :param str msg: Message to log.
+        """
+        self.logger.info(msg)
+
+    def warning(self, msg, files):
+        """
+        Logs a validation warning message. The warning message is
+        used as the error message that is output in the reviewbot.
+
+        :param str msg: Message to log, it's also used as the error message
+            for the issue that is output by the reviewbot.
+        :param list/str files: The file(s) that this warning is about.
+        """
+        if type(files) != list:
+            files = [files]
+
+        # Add a reviewbot error for each file that is given
+        for file in files:
+            # Get a relative path (reviewbot can't handle absolute paths)
+            fpath = re.sub(PerfDocLogger.TOP_DIR, "", file)
+
+            # Filter out any issues that do not relate to the paths
+            # that are being linted
+            for path in PerfDocLogger.PATHS:
+                if path not in file:
+                    continue
+
+                # Output error entry
+                self.logger.lint_error(
+                    message=msg,
+                    lineno=0,
+                    column=None,
+                    path=fpath,
+                    linter="perfdocs",
+                    rule="Flawless performance docs.",
+                )
+
+                PerfDocLogger.FAILED = True
+                break
+
+    def critical(self, msg):
+        """
+        Log a critical message.
+
+        :param str msg: Message to log.
+        """
+        self.logger.critical(msg)
diff --git a/tools/lint/perfdocs/perfdocs.py b/tools/lint/perfdocs/perfdocs.py
new file mode 100644
index 0000000000..3df01595c2
--- /dev/null
+++ b/tools/lint/perfdocs/perfdocs.py
@@ -0,0 +1,79 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+from __future__ import absolute_import, print_function
+
+import os
+import re
+
+
+def run_perfdocs(config, logger=None, paths=None, generate=True):
+    """
+    Build up performance testing documentation dynamically by combining
+    text data from YAML files that reside in `perfdoc` folders
+    across the `testing` directory. Each directory is expected to have
+    an `index.rst` file along with `config.yml` YAMLs defining what needs
+    to be added to the documentation.
+
+    The YAML must also define the name of the "framework" that should be
+    used in the main index.rst for the performance testing documentation.
+
+    The testing documentation list will be ordered alphabetically once
+    it's produced (to avoid unwanted shifts because of unordered dicts
+    and path searching).
+
+    Note that the suite name headings will be given the H4 (---) style so it
+    is suggested that you use H3 (===) style as the heading for your
+    test section. H5 will be used be used for individual tests within each
+    suite.
+
+    Usage for verification: ./mach lint -l perfdocs
+    Usage for generation: ./mach lint -l perfdocs --fix
+
+    For validation, see the Verifier class for a description of how
+    it works.
+
+    The run will fail if the valid result from validate_tree is not
+    False, implying some warning/problem was logged.
+
+    :param dict config: The configuration given by mozlint.
+    :param StructuredLogger logger: The StructuredLogger instance to be used to
+        output the linting warnings/errors.
+    :param list paths: The paths that are being tested. Used to filter
+        out errors from files outside of these paths.
+    :param bool generate: If true, the docs will be (re)generated.
+    """
+    from perfdocs.logger import PerfDocLogger
+
+    top_dir = os.environ.get("WORKSPACE", None)
+    if not top_dir:
+        floc = os.path.abspath(__file__)
+        top_dir = floc.split("tools")[0]
+    top_dir = top_dir.replace("\\", "\\\\")
+
+    PerfDocLogger.LOGGER = logger
+    PerfDocLogger.TOP_DIR = top_dir
+
+    # Convert all the paths to relative ones
+    rel_paths = [re.sub(top_dir, "", path) for path in paths]
+    PerfDocLogger.PATHS = rel_paths
+
+    target_dir = [os.path.join(top_dir, i) for i in rel_paths]
+    for path in target_dir:
+        if not os.path.exists(path):
+            raise Exception("Cannot locate directory at %s" % path)
+
+    # Late import because logger isn't defined until later
+    from perfdocs.generator import Generator
+    from perfdocs.verifier import Verifier
+
+    # Run the verifier first
+    verifier = Verifier(top_dir)
+    verifier.validate_tree()
+
+    if not PerfDocLogger.FAILED:
+        # Even if the tree is valid, we need to check if the documentation
+        # needs to be regenerated, and if it does, we throw a linting error.
+        # `generate` dictates whether or not the documentation is generated.
+        generator = Generator(verifier, generate=generate, workspace=top_dir)
+        generator.generate_perfdocs()
diff --git a/tools/lint/perfdocs/templates/index.rst b/tools/lint/perfdocs/templates/index.rst
new file mode 100644
index 0000000000..cd6e258980
--- /dev/null
+++ b/tools/lint/perfdocs/templates/index.rst
@@ -0,0 +1,14 @@
+###################
+Performance Testing
+###################
+
+Performance tests are designed to catch performance regressions before they reach our
+end users. At this time, there is no unified approach for these types of tests,
+but `mozperftest </testing/perfdocs/mozperftest.html>`_ aims to provide this in the future.
+
+For more detailed information about each test suite, see each projects' documentation:
+
+{test_documentation}
+
+For more information about the performance testing team,
+`visit the wiki page <https://wiki.mozilla.org/TestEngineering/Performance>`_.
diff --git a/tools/lint/perfdocs/utils.py b/tools/lint/perfdocs/utils.py
new file mode 100644
index 0000000000..99b304260b
--- /dev/null
+++ b/tools/lint/perfdocs/utils.py
@@ -0,0 +1,83 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+from __future__ import absolute_import
+
+import filecmp
+import os
+import yaml
+from perfdocs.logger import PerfDocLogger
+
+logger = PerfDocLogger()
+
+
+def save_file(file_content, path, extension="rst"):
+    """
+    Saves data into a file.
+
+    :param str path: Location and name of the file being saved
+        (without an extension).
+    :param str data: Content to write into the file.
+    :param str extension: Extension to save the file as.
+    """
+    with open("{}.{}".format(path, extension), "w") as f:
+        f.write(file_content)
+
+
+def read_file(path, stringify=False):
+    """
+    Opens a file and returns its contents.
+
+    :param str path: Path to the file.
+    :return list: List containing the lines in the file.
+    """
+    with open(path, "r") as f:
+        return f.read() if stringify else f.readlines()
+
+
+def read_yaml(yaml_path):
+    """
+    Opens a YAML file and returns the contents.
+
+    :param str yaml_path: Path to the YAML to open.
+    :return dict: Dictionary containing the YAML content.
+    """
+    contents = {}
+    try:
+        with open(yaml_path, "r") as f:
+            contents = yaml.safe_load(f)
+    except Exception as e:
+        logger.warning("Error opening file {}: {}".format(yaml_path, str(e)), yaml_path)
+
+    return contents
+
+
+def are_dirs_equal(dir_1, dir_2):
+    """
+    Compare two directories to see if they are equal. Files in each
+    directory are assumed to be equal if their names and contents
+    are equal.
+
+    :param dir_1: First directory path
+    :param dir_2: Second directory path
+    :return: True if the directory trees are the same and False otherwise.
+    """
+
+    dirs_cmp = filecmp.dircmp(dir_1, dir_2)
+    if dirs_cmp.left_only or dirs_cmp.right_only or dirs_cmp.funny_files:
+        return False
+
+    _, mismatch, errors = filecmp.cmpfiles(
+        dir_1, dir_2, dirs_cmp.common_files, shallow=False
+    )
+
+    if mismatch or errors:
+        return False
+
+    for common_dir in dirs_cmp.common_dirs:
+        subdir_1 = os.path.join(dir_1, common_dir)
+        subdir_2 = os.path.join(dir_2, common_dir)
+        if not are_dirs_equal(subdir_1, subdir_2):
+            return False
+
+    return True
diff --git a/tools/lint/perfdocs/verifier.py b/tools/lint/perfdocs/verifier.py
new file mode 100644
index 0000000000..a9a34478eb
--- /dev/null
+++ b/tools/lint/perfdocs/verifier.py
@@ -0,0 +1,310 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+from __future__ import absolute_import
+
+import jsonschema
+import os
+import re
+
+from perfdocs.logger import PerfDocLogger
+from perfdocs.utils import read_file, read_yaml
+from perfdocs.gatherer import Gatherer
+
+logger = PerfDocLogger()
+
+"""
+Schema for the config.yml file.
+Expecting a YAML file with a format such as this:
+
+name: raptor
+manifest: testing/raptor/raptor/raptor.ini
+static-only: False
+suites:
+    desktop:
+        description: "Desktop tests."
+        tests:
+            raptor-tp6: "Raptor TP6 tests."
+    mobile:
+        description: "Mobile tests"
+    benchmarks:
+        description: "Benchmark tests."
+        tests:
+            wasm: "All wasm tests."
+
+"""
+CONFIG_SCHEMA = {
+    "type": "object",
+    "properties": {
+        "name": {"type": "string"},
+        "manifest": {"type": "string"},
+        "static-only": {"type": "boolean"},
+        "suites": {
+            "type": "object",
+            "properties": {
+                "suite_name": {
+                    "type": "object",
+                    "properties": {
+                        "tests": {
+                            "type": "object",
+                            "properties": {"test_name": {"type": "string"}},
+                        },
+                        "description": {"type": "string"},
+                    },
+                    "required": ["description"],
+                }
+            },
+        },
+    },
+    "required": ["name", "manifest", "static-only", "suites"],
+}
+
+
+class Verifier(object):
+    """
+    Verifier is used for validating the perfdocs folders/tree. In the future,
+    the generator will make use of this class to obtain a validated set of
+    descriptions that can be used to build up a document.
+    """
+
+    def __init__(self, workspace_dir):
+        """
+        Initialize the Verifier.
+
+        :param str workspace_dir: Path to the top-level checkout directory.
+        """
+        self.workspace_dir = workspace_dir
+        self._gatherer = Gatherer(workspace_dir)
+
+    def validate_descriptions(self, framework_info):
+        """
+        Cross-validate the tests found in the manifests and the YAML
+        test definitions. This function doesn't return a valid flag. Instead,
+        the StructDocLogger.VALIDATION_LOG is used to determine validity.
+
+        The validation proceeds as follows:
+            1. Check that all tests/suites in the YAML exist in the manifests.
+                - At the same time, build a list of global descriptions which
+                   define descriptions for groupings of tests.
+            2. Check that all tests/suites found in the manifests exist in the YAML.
+                - For missing tests, check if a global description for them exists.
+
+        As the validation is completed, errors are output into the validation log
+        for any issues that are found.
+
+        :param dict framework_info: Contains information about the framework. See
+            `Gatherer.get_test_list` for information about its structure.
+        """
+        yaml_content = framework_info["yml_content"]
+
+        # Check for any bad test/suite names in the yaml config file
+        global_descriptions = {}
+        for suite, ytests in yaml_content["suites"].items():
+            # Find the suite, then check against the tests within it
+            if framework_info["test_list"].get(suite):
+                global_descriptions[suite] = []
+                if not ytests.get("tests"):
+                    # It's possible a suite entry has no tests
+                    continue
+
+                # Suite found - now check if any tests in YAML
+                # definitions doesn't exist
+                ytests = ytests["tests"]
+                for test_name in ytests:
+                    foundtest = False
+                    for t in framework_info["test_list"][suite]:
+                        tb = os.path.basename(t)
+                        tb = re.sub("\..*", "", tb)
+                        if test_name == tb:
+                            # Found an exact match for the test_name
+                            foundtest = True
+                            break
+                        if test_name in tb:
+                            # Found a 'fuzzy' match for the test_name
+                            # i.e. 'wasm' could exist for all raptor wasm tests
+                            global_descriptions[suite].append(test_name)
+                            foundtest = True
+                            break
+                    if not foundtest:
+                        logger.warning(
+                            "Could not find an existing test for {} - bad test name?".format(
+                                test_name
+                            ),
+                            framework_info["yml_path"],
+                        )
+            else:
+                logger.warning(
+                    "Could not find an existing suite for {} - bad suite name?".format(
+                        suite
+                    ),
+                    framework_info["yml_path"],
+                )
+
+        # Check for any missing tests/suites
+        for suite, test_list in framework_info["test_list"].items():
+            if not yaml_content["suites"].get(suite):
+                # Description doesn't exist for the suite
+                logger.warning(
+                    "Missing suite description for {}".format(suite),
+                    yaml_content["manifest"],
+                )
+                continue
+
+            # If only a description is provided for the suite, assume
+            # that this is a suite-wide description and don't check for
+            # it's tests
+            stests = yaml_content["suites"][suite].get("tests", None)
+            if not stests:
+                continue
+
+            tests_found = 0
+            missing_tests = []
+            test_to_manifest = {}
+            for test_name, manifest_path in test_list.items():
+                tb = os.path.basename(manifest_path)
+                tb = re.sub("\..*", "", tb)
+                if (
+                    stests.get(tb, None) is not None
+                    or stests.get(test_name, None) is not None
+                ):
+                    # Test description exists, continue with the next test
+                    tests_found += 1
+                    continue
+                test_to_manifest[test_name] = manifest_path
+                missing_tests.append(test_name)
+
+            # Check if global test descriptions exist (i.e.
+            # ones that cover all of tp6) for the missing tests
+            new_mtests = []
+            for mt in missing_tests:
+                found = False
+                for test_name in global_descriptions[suite]:
+                    # Global test exists for this missing test
+                    if mt.startswith(test_name):
+                        found = True
+                        break
+                    if test_name in mt:
+                        found = True
+                        break
+                if not found:
+                    new_mtests.append(mt)
+
+            if len(new_mtests):
+                # Output an error for each manifest with a missing
+                # test description
+                for test_name in new_mtests:
+                    logger.warning(
+                        "Could not find a test description for {}".format(test_name),
+                        test_to_manifest[test_name],
+                    )
+
+    def validate_yaml(self, yaml_path):
+        """
+        Validate that the YAML file has all the fields that are
+        required and parse the descriptions into strings in case
+        some are give as relative file paths.
+
+        :param str yaml_path: Path to the YAML to validate.
+        :return bool: True/False => Passed/Failed Validation
+        """
+
+        def _get_description(desc):
+            """
+            Recompute the description in case it's a file.
+            """
+            desc_path = os.path.join(self.workspace_dir, desc)
+            if os.path.exists(desc_path) and os.path.isfile(desc_path):
+                with open(desc_path, "r") as f:
+                    desc = f.readlines()
+            return desc
+
+        def _parse_descriptions(content):
+            for suite, sinfo in content.items():
+                desc = sinfo["description"]
+                sinfo["description"] = _get_description(desc)
+
+                # It's possible that the suite has no tests and
+                # only a description. If they exist, then parse them.
+                if "tests" in sinfo:
+                    for test, desc in sinfo["tests"].items():
+                        sinfo["tests"][test] = _get_description(desc)
+
+        valid = False
+        yaml_content = read_yaml(yaml_path)
+
+        try:
+            jsonschema.validate(instance=yaml_content, schema=CONFIG_SCHEMA)
+            _parse_descriptions(yaml_content["suites"])
+            valid = True
+        except Exception as e:
+            logger.warning("YAML ValidationError: {}".format(str(e)), yaml_path)
+
+        return valid
+
+    def validate_rst_content(self, rst_path):
+        """
+        Validate that the index file given has a {documentation} entry
+        so that the documentation can be inserted there.
+
+        :param str rst_path: Path to the RST file.
+        :return bool: True/False => Passed/Failed Validation
+        """
+        rst_content = read_file(rst_path)
+
+        # Check for a {documentation} entry in some line,
+        # if we can't find one, then the validation fails.
+        valid = False
+        docs_match = re.compile(".*{documentation}.*")
+        for line in rst_content:
+            if docs_match.search(line):
+                valid = True
+                break
+        if not valid:
+            logger.warning(
+                "Cannot find a '{documentation}' entry in the given index file",
+                rst_path,
+            )
+
+        return valid
+
+    def _check_framework_descriptions(self, item):
+        """
+        Helper method for validating descriptions
+        """
+        framework_info = self._gatherer.get_test_list(item)
+        self.validate_descriptions(framework_info)
+
+    def validate_tree(self):
+        """
+        Validate the `perfdocs` directory that was found.
+        Returns True if it is good, false otherwise.
+
+        :return bool: True/False => Passed/Failed Validation
+        """
+        found_good = 0
+
+        # For each framework, check their files and validate descriptions
+        for matched in self._gatherer.perfdocs_tree:
+            # Get the paths to the YAML and RST for this framework
+            matched_yml = os.path.join(matched["path"], matched["yml"])
+            matched_rst = os.path.join(matched["path"], matched["rst"])
+
+            _valid_files = {
+                "yml": self.validate_yaml(matched_yml),
+                "rst": True,
+            }
+            if not read_yaml(matched_yml)["static-only"]:
+                _valid_files["rst"] = self.validate_rst_content(matched_rst)
+
+            # Log independently the errors found for the matched files
+            for file_format, valid in _valid_files.items():
+                if not valid:
+                    logger.log("File validation error: {}".format(file_format))
+            if not all(_valid_files.values()):
+                continue
+            found_good += 1
+
+            self._check_framework_descriptions(matched)
+
+        if not found_good:
+            raise Exception("No valid perfdocs directories found")
diff --git a/tools/lint/py2.yml b/tools/lint/py2.yml
new file mode 100644
index 0000000000..f435e39d1e
--- /dev/null
+++ b/tools/lint/py2.yml
@@ -0,0 +1,57 @@
+---
+py2:
+    description: Python 2 compatibility check
+    include: ['.']
+    exclude:
+        - build
+        - dom
+        - editor
+        - gfx
+        - ipc
+        - js/src
+        - layout
+        - modules
+        - mozglue
+        - netwerk
+        - nsprpub
+        - other-licenses
+        - python/mozbuild/mozbuild/fork_interpose.py
+        - security
+        - servo
+        - taskcluster/docker/funsize-update-generator
+        - taskcluster/docker/visual-metrics
+        - testing/condprofile
+        - testing/gtest
+        - testing/mochitest
+        - testing/mozharness
+        - testing/raptor
+        - testing/tools
+        - testing/web-platform
+        - toolkit
+        - tools/update-packaging
+        - xpcom
+
+        # These paths are intentionally excluded (Python 3 only)
+        - config/create_rc.py
+        - config/create_res.py
+        - config/printconfigsetting.py
+        - python/mozbuild/mozbuild/action/unify_symbols.py
+        - python/mozbuild/mozbuild/action/unify_tests.py
+        - python/mozbuild/mozbuild/html_build_viewer.py
+        - python/mozbuild/mozpack/unify.py
+        - python/mozbuild/mozpack/test/test_unify.py
+        - python/mozlint
+        - python/mozperftest
+        - python/mozrelease/mozrelease/partner_repack.py
+        - taskcluster/test
+        - testing/performance
+        - tools/crashreporter/system-symbols/win/symsrv-fetch.py
+        - tools/github-sync
+        - tools/lint
+        - tools/tryselect
+    extensions: ['py']
+    support-files:
+        - 'tools/lint/python/*compat*'
+    type: external
+    payload: python.compat:lintpy2
+    setup: python.compat:setuppy2
diff --git a/tools/lint/py3.yml b/tools/lint/py3.yml
new file mode 100644
index 0000000000..709c4e344b
--- /dev/null
+++ b/tools/lint/py3.yml
@@ -0,0 +1,27 @@
+---
+py3:
+    description: Python 3 compatibility check
+    include: ['.']
+    exclude:
+        - browser/app
+        - build
+        - dom/canvas/test
+        - gfx
+        - ipc/ipdl
+        - layout/style/ServoCSSPropList.mako.py
+        - security/manager/ssl
+        - testing/awsy
+        - testing/condprofile/condprof/android.py
+        - testing/condprofile/condprof/desktop.py
+        - testing/gtest
+        - testing/mozharness
+        - testing/tps
+        - testing/web-platform/tests
+        - toolkit
+        - xpcom/idl-parser
+    extensions: ['py']
+    support-files:
+        - 'tools/lint/python/*compat*'
+    type: external
+    payload: python.compat:lintpy3
+    setup: python.compat:setuppy3
diff --git a/tools/lint/pylint.yml b/tools/lint/pylint.yml
new file mode 100644
index 0000000000..62c8b1a324
--- /dev/null
+++ b/tools/lint/pylint.yml
@@ -0,0 +1,26 @@
+---
+pylint:
+    description: A second Python linter
+    include:
+        - configure.py
+        - client.py
+        - security/
+        - accessible/
+        - docs/
+        - dom/base/
+        - dom/websocket/
+        - mozglue/
+        - toolkit/components/telemetry/
+    exclude:
+        - dom/bindings/Codegen.py
+        - dom/bindings/Configuration.py
+        - security/manager/tools/crtshToIdentifyingStruct/crtshToIdentifyingStruct.py
+        - security/manager/ssl/tests/unit/test_content_signing/pysign.py
+        - security/ct/tests/gtest/createSTHTestData.py
+    extensions: ['py']
+    support-files:
+        - '**/.pylint'
+        - 'tools/lint/python/pylint*'
+    type: external
+    payload: python.pylint:lint
+    setup: python.pylint:setup
diff --git a/tools/lint/python/__init__.py b/tools/lint/python/__init__.py
new file mode 100644
index 0000000000..c580d191c1
--- /dev/null
+++ b/tools/lint/python/__init__.py
@@ -0,0 +1,3 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
diff --git a/tools/lint/python/black.py b/tools/lint/python/black.py
new file mode 100644
index 0000000000..2fe58a0ea5
--- /dev/null
+++ b/tools/lint/python/black.py
@@ -0,0 +1,141 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import absolute_import, print_function
+
+import os
+import platform
+import re
+import signal
+import subprocess
+import sys
+
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+from mozprocess import ProcessHandler
+
+here = os.path.abspath(os.path.dirname(__file__))
+BLACK_REQUIREMENTS_PATH = os.path.join(here, "black_requirements.txt")
+
+BLACK_INSTALL_ERROR = """
+Unable to install correct version of black
+Try to install it manually with:
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    BLACK_REQUIREMENTS_PATH
+)
+
+
+def default_bindir():
+    # We use sys.prefix to find executables as that gets modified with
+    # virtualenv's activate_this.py, whereas sys.executable doesn't.
+    if platform.system() == "Windows":
+        return os.path.join(sys.prefix, "Scripts")
+    else:
+        return os.path.join(sys.prefix, "bin")
+
+
+def get_black_version(binary):
+    """
+    Returns found binary's version
+    """
+    try:
+        output = subprocess.check_output(
+            [binary, "--version"],
+            stderr=subprocess.STDOUT,
+            universal_newlines=True,
+        )
+    except subprocess.CalledProcessError as e:
+        output = e.output
+
+    return re.match(r"black, version (.*)$", output)[1]
+
+
+def parse_issues(config, output, paths, *, log):
+    would_reformat = re.compile("^would reformat (.*)$", re.I)
+    reformatted = re.compile("^reformatted (.*)$", re.I)
+    cannot_reformat = re.compile("^error: cannot format (.*?): (.*)$", re.I)
+    results = []
+    for line in output:
+        line = line.decode("utf-8")
+        if line.startswith("All done!") or line.startswith("Oh no!"):
+            break
+
+        match = would_reformat.match(line)
+        if match:
+            res = {"path": match.group(1), "level": "error"}
+            results.append(result.from_config(config, **res))
+            continue
+
+        match = reformatted.match(line)
+        if match:
+            res = {"path": match.group(1), "level": "warning", "message": "reformatted"}
+            results.append(result.from_config(config, **res))
+            continue
+
+        match = cannot_reformat.match(line)
+        if match:
+            res = {"path": match.group(1), "level": "error", "message": match.group(2)}
+            results.append(result.from_config(config, **res))
+            continue
+
+        log.debug("Unhandled line", line)
+    return results
+
+
+class BlackProcess(ProcessHandler):
+    def __init__(self, config, *args, **kwargs):
+        self.config = config
+        kwargs["stream"] = False
+        ProcessHandler.__init__(self, *args, **kwargs)
+
+    def run(self, *args, **kwargs):
+        orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+        ProcessHandler.run(self, *args, **kwargs)
+        signal.signal(signal.SIGINT, orig)
+
+
+def run_process(config, cmd):
+    proc = BlackProcess(config, cmd)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+    return proc.output
+
+
+def setup(root, **lintargs):
+    virtualenv_manager = lintargs["virtualenv_manager"]
+    try:
+        virtualenv_manager.install_pip_requirements(BLACK_REQUIREMENTS_PATH, quiet=True)
+    except subprocess.CalledProcessError:
+        print(BLACK_INSTALL_ERROR)
+        return 1
+
+
+def run_black(config, paths, fix=None, *, log, virtualenv_bin_path):
+    binary = os.path.join(virtualenv_bin_path or default_bindir(), "black")
+
+    log.debug("Black version {}".format(get_black_version(binary)))
+
+    cmd_args = [binary]
+    if not fix:
+        cmd_args.append("--check")
+    base_command = cmd_args + paths
+    log.debug("Command: {}".format(" ".join(base_command)))
+    return parse_issues(config, run_process(config, base_command), paths, log=log)
+
+
+def lint(paths, config, fix=None, **lintargs):
+    files = list(expand_exclusions(paths, config, lintargs["root"]))
+
+    return run_black(
+        config,
+        files,
+        fix=fix,
+        log=lintargs["log"],
+        virtualenv_bin_path=lintargs.get("virtualenv_bin_path"),
+    )
diff --git a/tools/lint/python/black_requirements.in b/tools/lint/python/black_requirements.in
new file mode 100644
index 0000000000..52ee1d9aa1
--- /dev/null
+++ b/tools/lint/python/black_requirements.in
@@ -0,0 +1 @@
+black==20.8b1
diff --git a/tools/lint/python/black_requirements.txt b/tools/lint/python/black_requirements.txt
new file mode 100644
index 0000000000..16f6e00fe4
--- /dev/null
+++ b/tools/lint/python/black_requirements.txt
@@ -0,0 +1,87 @@
+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    pip-compile --generate-hashes --output-file=tools/lint/python/black_requirements.txt tools/lint/python/black_requirements.in
+#
+#    MANUAL EDIT - for some reasons, dataclasses isn't added. Do it by hand:
+#    hashin -r tools/lint/python/black_requirements.txt dataclasses==0.6
+#
+appdirs==1.4.4 \
+    --hash=sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41 \
+    --hash=sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128 \
+    # via black
+black==20.8b1 \
+    --hash=sha256:1c02557aa099101b9d21496f8a914e9ed2222ef70336404eeeac8edba836fbea \
+    --hash=sha256:70b62ef1527c950db59062cda342ea224d772abdf6adc58b86a45421bab20a6b \
+    # via -r tools/lint/python/black_requirements.in
+click==7.1.2 \
+    --hash=sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a \
+    --hash=sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc \
+    # via black
+mypy-extensions==0.4.3 \
+    --hash=sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d \
+    --hash=sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8 \
+    # via black
+pathspec==0.8.0 \
+    --hash=sha256:7d91249d21749788d07a2d0f94147accd8f845507400749ea19c1ec9054a12b0 \
+    --hash=sha256:da45173eb3a6f2a5a487efba21f050af2b41948be6ab52b6a1e3ff22bb8b7061 \
+    # via black
+regex==2020.7.14 \
+    --hash=sha256:0dc64ee3f33cd7899f79a8d788abfbec168410be356ed9bd30bbd3f0a23a7204 \
+    --hash=sha256:1269fef3167bb52631ad4fa7dd27bf635d5a0790b8e6222065d42e91bede4162 \
+    --hash=sha256:14a53646369157baa0499513f96091eb70382eb50b2c82393d17d7ec81b7b85f \
+    --hash=sha256:3a3af27a8d23143c49a3420efe5b3f8cf1a48c6fc8bc6856b03f638abc1833bb \
+    --hash=sha256:46bac5ca10fb748d6c55843a931855e2727a7a22584f302dd9bb1506e69f83f6 \
+    --hash=sha256:4c037fd14c5f4e308b8370b447b469ca10e69427966527edcab07f52d88388f7 \
+    --hash=sha256:51178c738d559a2d1071ce0b0f56e57eb315bcf8f7d4cf127674b533e3101f88 \
+    --hash=sha256:5ea81ea3dbd6767873c611687141ec7b06ed8bab43f68fad5b7be184a920dc99 \
+    --hash=sha256:6961548bba529cac7c07af2fd4d527c5b91bb8fe18995fed6044ac22b3d14644 \
+    --hash=sha256:75aaa27aa521a182824d89e5ab0a1d16ca207318a6b65042b046053cfc8ed07a \
+    --hash=sha256:7a2dd66d2d4df34fa82c9dc85657c5e019b87932019947faece7983f2089a840 \
+    --hash=sha256:8a51f2c6d1f884e98846a0a9021ff6861bdb98457879f412fdc2b42d14494067 \
+    --hash=sha256:9c568495e35599625f7b999774e29e8d6b01a6fb684d77dee1f56d41b11b40cd \
+    --hash=sha256:9eddaafb3c48e0900690c1727fba226c4804b8e6127ea409689c3bb492d06de4 \
+    --hash=sha256:bbb332d45b32df41200380fff14712cb6093b61bd142272a10b16778c418e98e \
+    --hash=sha256:bc3d98f621898b4a9bc7fecc00513eec8f40b5b83913d74ccb445f037d58cd89 \
+    --hash=sha256:c11d6033115dc4887c456565303f540c44197f4fc1a2bfb192224a301534888e \
+    --hash=sha256:c50a724d136ec10d920661f1442e4a8b010a4fe5aebd65e0c2241ea41dbe93dc \
+    --hash=sha256:d0a5095d52b90ff38592bbdc2644f17c6d495762edf47d876049cfd2968fbccf \
+    --hash=sha256:d6cff2276e502b86a25fd10c2a96973fdb45c7a977dca2138d661417f3728341 \
+    --hash=sha256:e46d13f38cfcbb79bfdb2964b0fe12561fe633caf964a77a5f8d4e45fe5d2ef7 \
+    # via black
+toml==0.10.1 \
+    --hash=sha256:926b612be1e5ce0634a2ca03470f95169cf16f939018233a670519cb4ac58b0f \
+    --hash=sha256:bda89d5935c2eac546d648028b9901107a595863cb36bae0c73ac804a9b4ce88 \
+    # via black
+typed-ast==1.4.1 \
+    --hash=sha256:0666aa36131496aed8f7be0410ff974562ab7eeac11ef351def9ea6fa28f6355 \
+    --hash=sha256:0c2c07682d61a629b68433afb159376e24e5b2fd4641d35424e462169c0a7919 \
+    --hash=sha256:249862707802d40f7f29f6e1aad8d84b5aa9e44552d2cc17384b209f091276aa \
+    --hash=sha256:24995c843eb0ad11a4527b026b4dde3da70e1f2d8806c99b7b4a7cf491612652 \
+    --hash=sha256:269151951236b0f9a6f04015a9004084a5ab0d5f19b57de779f908621e7d8b75 \
+    --hash=sha256:4083861b0aa07990b619bd7ddc365eb7fa4b817e99cf5f8d9cf21a42780f6e01 \
+    --hash=sha256:498b0f36cc7054c1fead3d7fc59d2150f4d5c6c56ba7fb150c013fbc683a8d2d \
+    --hash=sha256:4e3e5da80ccbebfff202a67bf900d081906c358ccc3d5e3c8aea42fdfdfd51c1 \
+    --hash=sha256:6daac9731f172c2a22ade6ed0c00197ee7cc1221aa84cfdf9c31defeb059a907 \
+    --hash=sha256:715ff2f2df46121071622063fc7543d9b1fd19ebfc4f5c8895af64a77a8c852c \
+    --hash=sha256:73d785a950fc82dd2a25897d525d003f6378d1cb23ab305578394694202a58c3 \
+    --hash=sha256:8c8aaad94455178e3187ab22c8b01a3837f8ee50e09cf31f1ba129eb293ec30b \
+    --hash=sha256:8ce678dbaf790dbdb3eba24056d5364fb45944f33553dd5869b7580cdbb83614 \
+    --hash=sha256:aaee9905aee35ba5905cfb3c62f3e83b3bec7b39413f0a7f19be4e547ea01ebb \
+    --hash=sha256:bcd3b13b56ea479b3650b82cabd6b5343a625b0ced5429e4ccad28a8973f301b \
+    --hash=sha256:c9e348e02e4d2b4a8b2eedb48210430658df6951fa484e59de33ff773fbd4b41 \
+    --hash=sha256:d205b1b46085271b4e15f670058ce182bd1199e56b317bf2ec004b6a44f911f6 \
+    --hash=sha256:d43943ef777f9a1c42bf4e552ba23ac77a6351de620aa9acf64ad54933ad4d34 \
+    --hash=sha256:d5d33e9e7af3b34a40dc05f498939f0ebf187f07c385fd58d591c533ad8562fe \
+    --hash=sha256:fc0fea399acb12edbf8a628ba8d2312f583bdbdb3335635db062fa98cf71fca4 \
+    --hash=sha256:fe460b922ec15dd205595c9b5b99e2f056fd98ae8f9f56b888e7a17dc2b757e7 \
+    # via black
+typing-extensions==3.7.4.3 \
+    --hash=sha256:7cb407020f00f7bfc3cb3e7881628838e69d8f3fcab2f64742a5e76b2f841918 \
+    --hash=sha256:99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c \
+    --hash=sha256:dafc7639cde7f1b6e1acc0f457842a83e722ccca8eef5270af2d74792619a89f \
+    # via black
+dataclasses==0.6 \
+    --hash=sha256:454a69d788c7fda44efd71e259be79577822f5e3f53f029a22d08004e951dc9f \
+    --hash=sha256:6988bd2b895eef432d562370bb707d540f32f7360ab13da45340101bc2307d84
diff --git a/tools/lint/python/check_compat.py b/tools/lint/python/check_compat.py
new file mode 100755
index 0000000000..25a15fcedc
--- /dev/null
+++ b/tools/lint/python/check_compat.py
@@ -0,0 +1,87 @@
+#!/usr/bin/env python
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import ast
+import json
+import sys
+
+
+def parse_file(f):
+    with open(f, "rb") as fh:
+        content = fh.read()
+    try:
+        return ast.parse(content)
+    except SyntaxError as e:
+        err = {
+            "path": f,
+            "message": e.msg,
+            "lineno": e.lineno,
+            "column": e.offset,
+            "source": e.text,
+            "rule": "is-parseable",
+        }
+        print(json.dumps(err))
+
+
+def check_compat_py2(f):
+    """Check Python 2 and Python 3 compatibility for a file with Python 2"""
+    root = parse_file(f)
+
+    # Ignore empty or un-parseable files.
+    if not root or not root.body:
+        return
+
+    futures = set()
+    haveprint = False
+    future_lineno = 1
+    may_have_relative_imports = False
+    for node in ast.walk(root):
+        if isinstance(node, ast.ImportFrom):
+            if node.module == "__future__":
+                future_lineno = node.lineno
+                futures |= set(n.name for n in node.names)
+            else:
+                may_have_relative_imports = True
+        elif isinstance(node, ast.Import):
+            may_have_relative_imports = True
+        elif isinstance(node, ast.Print):
+            haveprint = True
+
+    err = {
+        "path": f,
+        "lineno": future_lineno,
+        "column": 1,
+    }
+
+    if "absolute_import" not in futures and may_have_relative_imports:
+        err["rule"] = "require absolute_import"
+        err["message"] = "Missing from __future__ import absolute_import"
+        print(json.dumps(err))
+
+    if haveprint and "print_function" not in futures:
+        err["rule"] = "require print_function"
+        err["message"] = "Missing from __future__ import print_function"
+        print(json.dumps(err))
+
+
+def check_compat_py3(f):
+    """Check Python 3 compatibility of a file with Python 3."""
+    parse_file(f)
+
+
+if __name__ == "__main__":
+    if sys.version_info[0] == 2:
+        fn = check_compat_py2
+    else:
+        fn = check_compat_py3
+
+    manifest = sys.argv[1]
+    with open(manifest, "r") as fh:
+        files = fh.read().splitlines()
+
+    for f in files:
+        fn(f)
+
+    sys.exit(0)
diff --git a/tools/lint/python/compat.py b/tools/lint/python/compat.py
new file mode 100644
index 0000000000..dd541bd66e
--- /dev/null
+++ b/tools/lint/python/compat.py
@@ -0,0 +1,91 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import os
+from distutils.spawn import find_executable
+
+import mozfile
+from mozprocess import ProcessHandlerMixin
+
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+here = os.path.abspath(os.path.dirname(__file__))
+
+results = []
+
+
+class PyCompatProcess(ProcessHandlerMixin):
+    def __init__(self, config, *args, **kwargs):
+        self.config = config
+        kwargs["processOutputLine"] = [self.process_line]
+        ProcessHandlerMixin.__init__(self, *args, **kwargs)
+
+    def process_line(self, line):
+        try:
+            res = json.loads(line)
+        except ValueError:
+            print(
+                "Non JSON output from {} linter: {}".format(self.config["name"], line)
+            )
+            return
+
+        res["level"] = "error"
+        results.append(result.from_config(self.config, **res))
+
+
+def setup(python):
+    """Setup doesn't currently do any bootstrapping. For now, this function
+    is only used to print the warning message.
+    """
+    binary = find_executable(python)
+    if not binary:
+        # TODO Bootstrap python2/python3 if not available
+        print("warning: {} not detected, skipping py-compat check".format(python))
+
+
+def run_linter(python, paths, config, **lintargs):
+    log = lintargs["log"]
+    binary = find_executable(python)
+    if not binary:
+        # If we're in automation, this is fatal. Otherwise, the warning in the
+        # setup method was already printed.
+        if "MOZ_AUTOMATION" in os.environ:
+            return 1
+        return []
+
+    files = expand_exclusions(paths, config, lintargs["root"])
+
+    with mozfile.NamedTemporaryFile(mode="w") as fh:
+        fh.write("\n".join(files))
+        fh.flush()
+
+        cmd = [binary, os.path.join(here, "check_compat.py"), fh.name]
+        log.debug("Command: {}".format(" ".join(cmd)))
+
+        proc = PyCompatProcess(config, cmd)
+        proc.run()
+        try:
+            proc.wait()
+        except KeyboardInterrupt:
+            proc.kill()
+
+    return results
+
+
+def setuppy2(**lintargs):
+    return setup("python2")
+
+
+def lintpy2(*args, **kwargs):
+    return run_linter("python2", *args, **kwargs)
+
+
+def setuppy3(**lintargs):
+    return setup("python3")
+
+
+def lintpy3(*args, **kwargs):
+    return run_linter("python3", *args, **kwargs)
diff --git a/tools/lint/python/flake8.py b/tools/lint/python/flake8.py
new file mode 100644
index 0000000000..49ab04b019
--- /dev/null
+++ b/tools/lint/python/flake8.py
@@ -0,0 +1,191 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import os
+import platform
+import subprocess
+import sys
+
+import mozfile
+import mozpack.path as mozpath
+
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+here = os.path.abspath(os.path.dirname(__file__))
+FLAKE8_REQUIREMENTS_PATH = os.path.join(here, "flake8_requirements.txt")
+
+FLAKE8_NOT_FOUND = """
+Could not find flake8! Install flake8 and try again.
+
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    FLAKE8_REQUIREMENTS_PATH
+)
+
+
+FLAKE8_INSTALL_ERROR = """
+Unable to install correct version of flake8
+Try to install it manually with:
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    FLAKE8_REQUIREMENTS_PATH
+)
+
+LINE_OFFSETS = {
+    # continuation line under-indented for hanging indent
+    "E121": (-1, 2),
+    # continuation line missing indentation or outdented
+    "E122": (-1, 2),
+    # continuation line over-indented for hanging indent
+    "E126": (-1, 2),
+    # continuation line over-indented for visual indent
+    "E127": (-1, 2),
+    # continuation line under-indented for visual indent
+    "E128": (-1, 2),
+    # continuation line unaligned for hanging indend
+    "E131": (-1, 2),
+    # expected 1 blank line, found 0
+    "E301": (-1, 2),
+    # expected 2 blank lines, found 1
+    "E302": (-2, 3),
+}
+"""Maps a flake8 error to a lineoffset tuple.
+
+The offset is of the form (lineno_offset, num_lines) and is passed
+to the lineoffset property of an `Issue`.
+"""
+
+
+def default_bindir():
+    # We use sys.prefix to find executables as that gets modified with
+    # virtualenv's activate_this.py, whereas sys.executable doesn't.
+    if platform.system() == "Windows":
+        return os.path.join(sys.prefix, "Scripts")
+    else:
+        return os.path.join(sys.prefix, "bin")
+
+
+class NothingToLint(Exception):
+    """Exception used to bail out of flake8's internals if all the specified
+    files were excluded.
+    """
+
+
+def setup(root, **lintargs):
+    virtualenv_manager = lintargs["virtualenv_manager"]
+    try:
+        virtualenv_manager.install_pip_requirements(
+            FLAKE8_REQUIREMENTS_PATH, quiet=True
+        )
+    except subprocess.CalledProcessError:
+        print(FLAKE8_INSTALL_ERROR)
+        return 1
+
+
+def lint(paths, config, **lintargs):
+    from flake8.main.application import Application
+
+    log = lintargs["log"]
+    root = lintargs["root"]
+    virtualenv_bin_path = lintargs.get("virtualenv_bin_path")
+    config_path = os.path.join(root, ".flake8")
+
+    if lintargs.get("fix"):
+        fix_cmd = [
+            os.path.join(virtualenv_bin_path or default_bindir(), "autopep8"),
+            "--global-config",
+            config_path,
+            "--in-place",
+            "--recursive",
+        ]
+
+        if config.get("exclude"):
+            fix_cmd.extend(["--exclude", ",".join(config["exclude"])])
+
+        subprocess.call(fix_cmd + paths)
+
+    # Run flake8.
+    app = Application()
+    log.debug("flake8 version={}".format(app.version))
+
+    output_file = mozfile.NamedTemporaryFile(mode="r")
+    flake8_cmd = [
+        "--config",
+        config_path,
+        "--output-file",
+        output_file.name,
+        "--format",
+        '{"path":"%(path)s","lineno":%(row)s,'
+        '"column":%(col)s,"rule":"%(code)s","message":"%(text)s"}',
+        "--filename",
+        ",".join(["*.{}".format(e) for e in config["extensions"]]),
+    ]
+    log.debug("Command: {}".format(" ".join(flake8_cmd)))
+
+    orig_make_file_checker_manager = app.make_file_checker_manager
+
+    def wrap_make_file_checker_manager(self):
+        """Flake8 is very inefficient when it comes to applying exclusion
+        rules, using `expand_exclusions` to turn directories into a list of
+        relevant python files is an order of magnitude faster.
+
+        Hooking into flake8 here also gives us a convenient place to merge the
+        `exclude` rules specified in the root .flake8 with the ones added by
+        tools/lint/mach_commands.py.
+        """
+        # Ignore exclude rules if `--no-filter` was passed in.
+        config.setdefault("exclude", [])
+        if lintargs.get("use_filters", True):
+            config["exclude"].extend(map(mozpath.normpath, self.options.exclude))
+
+        # Since we use the root .flake8 file to store exclusions, we haven't
+        # properly filtered the paths through mozlint's `filterpaths` function
+        # yet. This mimics that though there could be other edge cases that are
+        # different. Maybe we should call `filterpaths` directly, though for
+        # now that doesn't appear to be necessary.
+        filtered = [
+            p for p in paths if not any(p.startswith(e) for e in config["exclude"])
+        ]
+
+        self.args = self.args + list(expand_exclusions(filtered, config, root))
+
+        if not self.args:
+            raise NothingToLint
+        return orig_make_file_checker_manager()
+
+    app.make_file_checker_manager = wrap_make_file_checker_manager.__get__(
+        app, Application
+    )
+
+    # Make sure to run from repository root so exclusions are joined to the
+    # repository root and not the current working directory.
+    oldcwd = os.getcwd()
+    os.chdir(root)
+    try:
+        app.run(flake8_cmd)
+    except NothingToLint:
+        pass
+    finally:
+        os.chdir(oldcwd)
+
+    results = []
+
+    def process_line(line):
+        # Escape slashes otherwise JSON conversion will not work
+        line = line.replace("\\", "\\\\")
+        try:
+            res = json.loads(line)
+        except ValueError:
+            print("Non JSON output from linter, will not be processed: {}".format(line))
+            return
+
+        if res.get("code") in LINE_OFFSETS:
+            res["lineoffset"] = LINE_OFFSETS[res["code"]]
+
+        results.append(result.from_config(config, **res))
+
+    list(map(process_line, output_file.readlines()))
+    return results
diff --git a/tools/lint/python/flake8_requirements.txt b/tools/lint/python/flake8_requirements.txt
new file mode 100644
index 0000000000..2a691e6edf
--- /dev/null
+++ b/tools/lint/python/flake8_requirements.txt
@@ -0,0 +1,28 @@
+flake8==3.8.4 \
+    --hash=sha256:749dbbd6bfd0cf1318af27bf97a14e28e5ff548ef8e5b1566ccfb25a11e7c839 \
+    --hash=sha256:aadae8761ec651813c24be05c6f7b4680857ef6afaae4651a4eccaef97ce6c3b
+mccabe==0.6.1 \
+    --hash=sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42 \
+    --hash=sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f
+pyflakes==2.2.0 \
+    --hash=sha256:0d94e0e05a19e57a99444b6ddcf9a6eb2e5c68d3ca1e98e90707af8152c90a92 \
+    --hash=sha256:35b2d75ee967ea93b55750aa9edbbf72813e06a66ba54438df2cfac9e3c27fc8
+pycodestyle==2.6.0 \
+    --hash=sha256:2295e7b2f6b5bd100585ebcb1f616591b652db8a741695b3d8f5d28bdc934367 \
+    --hash=sha256:c58a7d2815e0e8d7972bf1803331fb0152f867bd89adf8a01dfd55085434192e
+setuptools==47.3.1 \
+    --hash=sha256:4ba6f9789ea243a6b8ba57da81f75a53494456117810436fd9277a74d1c915d1 \
+    --hash=sha256:843037738d1e34e8b326b5e061f474aca6ef9d7ece41329afbc8aac6195a3920
+autopep8==1.5.3 \
+    --hash=sha256:60fd8c4341bab59963dafd5d2a566e94f547e660b9b396f772afe67d8481dbf0
+entrypoints==0.3 \
+    --hash=sha256:589f874b313739ad35be6e0cd7efde2a4e9b6fea91edcc34e58ecbb8dbe56d19 \
+    --hash=sha256:c70dd71abe5a8c85e55e12c19bd91ccfeec11a6e99044204511f9ed547d48451
+toml==0.10.1 \
+    --hash=sha256:bda89d5935c2eac546d648028b9901107a595863cb36bae0c73ac804a9b4ce88
+importlib-metadata==1.6.1 \
+    --hash=sha256:0505dd08068cfec00f53a74a0ad927676d7757da81b7436a6eefe4c7cf75c545 \
+    --hash=sha256:15ec6c0fd909e893e3a08b3a7c76ecb149122fb14b7efe1199ddd4c7c57ea958
+zipp==3.1.0 \
+    --hash=sha256:aa36550ff0c0b7ef7fa639055d797116ee891440eac1a56f378e2d3179e0320b \
+    --hash=sha256:c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96
diff --git a/tools/lint/python/l10n_lint.py b/tools/lint/python/l10n_lint.py
new file mode 100644
index 0000000000..fb79d41a2f
--- /dev/null
+++ b/tools/lint/python/l10n_lint.py
@@ -0,0 +1,158 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from datetime import datetime, timedelta
+import os
+
+from mozboot import util as mb_util
+from mozlint import result, pathutils
+from mozpack import path as mozpath
+import mozversioncontrol.repoupdate
+
+from compare_locales.lint.linter import L10nLinter
+from compare_locales.lint.util import l10n_base_reference_and_tests
+from compare_locales import parser
+from compare_locales.paths import TOMLParser, ProjectFiles
+
+
+LOCALE = "gecko-strings"
+
+
+PULL_AFTER = timedelta(days=2)
+
+
+def lint(paths, lintconfig, **lintargs):
+    l10n_base = mb_util.get_state_dir()
+    root = lintargs["root"]
+    exclude = lintconfig.get("exclude")
+    extensions = lintconfig.get("extensions")
+
+    # Load l10n.toml configs
+    l10nconfigs = load_configs(lintconfig, root, l10n_base)
+
+    # Check include paths in l10n.yml if it's in our given paths
+    # Only the l10n.yml will show up here, but if the l10n.toml files
+    # change, we also get the l10n.yml as the toml files are listed as
+    # support files.
+    if lintconfig["path"] in paths:
+        results = validate_linter_includes(lintconfig, l10nconfigs, lintargs)
+        paths.remove(lintconfig["path"])
+    else:
+        results = []
+
+    all_files = []
+    for p in paths:
+        fp = pathutils.FilterPath(p)
+        if fp.isdir:
+            for _, fileobj in fp.finder:
+                all_files.append(fileobj.path)
+        if fp.isfile:
+            all_files.append(p)
+    # Filter again, our directories might have picked up files the
+    # explicitly excluded in the l10n.yml configuration.
+    # `browser/locales/en-US/firefox-l10n.js` is a good example.
+    all_files, _ = pathutils.filterpaths(
+        lintargs["root"],
+        all_files,
+        lintconfig["include"],
+        exclude=exclude,
+        extensions=extensions,
+    )
+    # These should be excluded in l10n.yml
+    skips = {p for p in all_files if not parser.hasParser(p)}
+    results.extend(
+        result.from_config(
+            lintconfig,
+            level="warning",
+            path=path,
+            message="file format not supported in compare-locales",
+        )
+        for path in skips
+    )
+    all_files = [p for p in all_files if p not in skips]
+    files = ProjectFiles(LOCALE, l10nconfigs)
+
+    get_reference_and_tests = l10n_base_reference_and_tests(files)
+
+    linter = MozL10nLinter(lintconfig)
+    results += linter.lint(all_files, get_reference_and_tests)
+    return results
+
+
+def gecko_strings_setup(**lint_args):
+    gs = mozpath.join(mb_util.get_state_dir(), LOCALE)
+    marker = mozpath.join(gs, ".hg", "l10n_pull_marker")
+    try:
+        last_pull = datetime.fromtimestamp(os.stat(marker).st_mtime)
+        skip_clone = datetime.now() < last_pull + PULL_AFTER
+    except OSError:
+        skip_clone = False
+    if skip_clone:
+        return
+    hg = mozversioncontrol.get_tool_path("hg")
+    mozversioncontrol.repoupdate.update_mercurial_repo(
+        hg, "https://hg.mozilla.org/l10n/gecko-strings", gs
+    )
+    with open(marker, "w") as fh:
+        fh.flush()
+
+
+def load_configs(lintconfig, root, l10n_base):
+    """Load l10n configuration files specified in the linter configuration."""
+    configs = []
+    env = {"l10n_base": l10n_base}
+    for toml in lintconfig["l10n_configs"]:
+        cfg = TOMLParser().parse(
+            mozpath.join(root, toml), env=env, ignore_missing_includes=True
+        )
+        cfg.set_locales([LOCALE], deep=True)
+        configs.append(cfg)
+    return configs
+
+
+def validate_linter_includes(lintconfig, l10nconfigs, lintargs):
+    """Check l10n.yml config against l10n.toml configs."""
+    reference_paths = set(
+        mozpath.relpath(p["reference"].prefix, lintargs["root"])
+        for project in l10nconfigs
+        for config in project.configs
+        for p in config.paths
+    )
+    # Just check for directories
+    reference_dirs = sorted(p for p in reference_paths if os.path.isdir(p))
+    missing_in_yml = [
+        refd for refd in reference_dirs if refd not in lintconfig["include"]
+    ]
+    # These might be subdirectories in the config, though
+    missing_in_yml = [
+        d
+        for d in missing_in_yml
+        if not any(d.startswith(parent + "/") for parent in lintconfig["include"])
+    ]
+    if missing_in_yml:
+        dirs = ", ".join(missing_in_yml)
+        return [
+            result.from_config(
+                lintconfig,
+                path=lintconfig["path"],
+                message="l10n.yml out of sync with l10n.toml, add: " + dirs,
+            )
+        ]
+    return []
+
+
+class MozL10nLinter(L10nLinter):
+    """Subclass linter to generate the right result type."""
+
+    def __init__(self, lintconfig):
+        super(MozL10nLinter, self).__init__()
+        self.lintconfig = lintconfig
+
+    def lint(self, files, get_reference_and_tests):
+        return [
+            result.from_config(self.lintconfig, **result_data)
+            for result_data in super(MozL10nLinter, self).lint(
+                files, get_reference_and_tests
+            )
+        ]
diff --git a/tools/lint/python/pylint.py b/tools/lint/python/pylint.py
new file mode 100644
index 0000000000..ba95be1f0b
--- /dev/null
+++ b/tools/lint/python/pylint.py
@@ -0,0 +1,137 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import os
+import subprocess
+
+import signal
+
+from mozprocess import ProcessHandler
+
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+here = os.path.abspath(os.path.dirname(__file__))
+PYLINT_REQUIREMENTS_PATH = os.path.join(here, "pylint_requirements.txt")
+
+PYLINT_NOT_FOUND = """
+Could not find pylint! Install pylint and try again.
+
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    PYLINT_REQUIREMENTS_PATH
+)
+
+
+PYLINT_INSTALL_ERROR = """
+Unable to install correct version of pylint
+Try to install it manually with:
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    PYLINT_REQUIREMENTS_PATH
+)
+
+
+class PylintProcess(ProcessHandler):
+    def __init__(self, config, *args, **kwargs):
+        self.config = config
+        kwargs["stream"] = False
+        kwargs["universal_newlines"] = True
+        ProcessHandler.__init__(self, *args, **kwargs)
+
+    def run(self, *args, **kwargs):
+        orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+        ProcessHandler.run(self, *args, **kwargs)
+        signal.signal(signal.SIGINT, orig)
+
+
+def setup(root, **lintargs):
+    virtualenv_manager = lintargs["virtualenv_manager"]
+    try:
+        virtualenv_manager.install_pip_requirements(
+            PYLINT_REQUIREMENTS_PATH,
+            quiet=True,
+            # The defined versions of astroid and lazy-object-proxy conflict and fail to
+            # install with the new 2020 pip resolver (bug 1682959)
+            legacy_resolver=True,
+        )
+    except subprocess.CalledProcessError:
+        print(PYLINT_INSTALL_ERROR)
+        return 1
+
+
+def get_pylint_binary():
+    return "pylint"
+
+
+def run_process(config, cmd):
+    proc = PylintProcess(config, cmd)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+    return proc.output
+
+
+def parse_issues(log, config, issues_json, path):
+    results = []
+
+    try:
+        issues = json.loads(issues_json)
+    except json.decoder.JSONDecodeError:
+        log.debug("Could not parse the output:")
+        log.debug("pylint output: {}".format(issues_json))
+        return []
+
+    for issue in issues:
+        res = {
+            "path": issue["path"],
+            "level": issue["type"],
+            "lineno": issue["line"],
+            "column": issue["column"],
+            "message": issue["message"],
+            "rule": issue["message-id"],
+        }
+        results.append(result.from_config(config, **res))
+    return results
+
+
+def get_pylint_version(binary):
+    return subprocess.check_output(
+        [binary, "--version"],
+        universal_newlines=True,
+        stderr=subprocess.STDOUT,
+    )
+
+
+def lint(paths, config, **lintargs):
+    log = lintargs["log"]
+
+    binary = get_pylint_binary()
+
+    log = lintargs["log"]
+    paths = list(expand_exclusions(paths, config, lintargs["root"]))
+
+    cmd_args = [binary]
+    results = []
+
+    # list from https://code.visualstudio.com/docs/python/linting#_pylint
+    # And ignore a bit more elements
+    cmd_args += [
+        "-fjson",
+        "--disable=all",
+        "--enable=F,E,unreachable,duplicate-key,unnecessary-semicolon,global-variable-not-assigned,unused-variable,binary-op-exception,bad-format-string,anomalous-backslash-in-string,bad-open-mode,no-else-return",  # NOQA: E501
+        "--disable=import-error,no-member",
+    ]
+
+    base_command = cmd_args + paths
+    log.debug("Command: {}".format(" ".join(cmd_args)))
+    log.debug("pylint version: {}".format(get_pylint_version(binary)))
+    output = " ".join(run_process(config, base_command))
+    results = parse_issues(log, config, str(output), [])
+
+    return results
diff --git a/tools/lint/python/pylint_requirements.txt b/tools/lint/python/pylint_requirements.txt
new file mode 100644
index 0000000000..c5e8d15723
--- /dev/null
+++ b/tools/lint/python/pylint_requirements.txt
@@ -0,0 +1,64 @@
+pylint==2.6.0 \
+    --hash=sha256:bb4a908c9dadbc3aac18860550e870f58e1a02c9f2c204fdf5693d73be061210 \
+    --hash=sha256:bfe68f020f8a0fece830a22dd4d5dddb4ecc6137db04face4c3420a46a52239f
+toml==0.10.1 \
+    --hash=sha256:926b612be1e5ce0634a2ca03470f95169cf16f939018233a670519cb4ac58b0f \
+    --hash=sha256:bda89d5935c2eac546d648028b9901107a595863cb36bae0c73ac804a9b4ce88
+mccabe==0.6.1 \
+    --hash=sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42 \
+    --hash=sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f
+six==1.15.0 \
+    --hash=sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259 \
+    --hash=sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced
+wrapt==1.12.1 \
+    --hash=sha256:b62ffa81fb85f4332a4f609cab4ac40709470da05643a082ec1eb88e6d9b97d7
+lazy-object-proxy==1.5.0 \
+    --hash=sha256:0aef3fa29f7d1194d6f8a99382b1b844e5a14d3bc1ef82c3b1c4fb7e7e2019bc \
+    --hash=sha256:159ae2bbb4dc3ba506aeba868d14e56a754c0be402d1f0d7fdb264e0bdf2b095 \
+    --hash=sha256:161a68a427022bf13e249458be2cb8da56b055988c584d372a917c665825ae9a \
+    --hash=sha256:2d58f0e6395bf41087a383a48b06b42165f3b699f1aa41ba201db84ab77be63d \
+    --hash=sha256:311c9d1840042fc8e2dd80fc80272a7ea73e7646745556153c9cda85a4628b18 \
+    --hash=sha256:35c3ad7b7f7d5d4a54a80f0ff5a41ab186237d6486843f8dde00c42cfab33905 \
+    --hash=sha256:459ef557e669d0046fe2b92eb4822c097c00b5ef9d11df0f9bd7d4267acdfc52 \
+    --hash=sha256:4a50513b6be001b9b7be2c435478fe9669249c77c241813907a44cda1fcd03f4 \
+    --hash=sha256:51035b175740c44707694c521560b55b66da9d5a7c545cf22582bc02deb61664 \
+    --hash=sha256:96f2cdb35bdfda10e075f12892a42cff5179bbda698992b845f36c5e92755d33 \
+    --hash=sha256:a0aed261060cd0372abf08d16399b1224dbb5b400312e6b00f2b23eabe1d4e96 \
+    --hash=sha256:a6052c4c7d95de2345d9c58fc0fe34fff6c27a8ed8550dafeb18ada84406cc99 \
+    --hash=sha256:cbf1354292a4f7abb6a0188f74f5e902e4510ebad105be1dbc4809d1ed92f77e \
+    --hash=sha256:da82b2372f5ded8806eaac95b19af89a7174efdb418d4e7beb0c6ab09cee7d95 \
+    --hash=sha256:dd89f466c930d7cfe84c94b5cbe862867c88b269f23e5aa61d40945e0d746f54 \
+    --hash=sha256:e3183fbeb452ec11670c2d9bfd08a57bc87e46856b24d1c335f995239bedd0e1 \
+    --hash=sha256:e9a571e7168076a0d5ecaabd91e9032e86d815cca3a4bf0dafead539ef071aa5 \
+    --hash=sha256:ec6aba217d0c4f71cbe48aea962a382dedcd111f47b55e8b58d4aaca519bd360
+astroid==2.4.2 \
+    --hash=sha256:2f4078c2a41bf377eea06d71c9d2ba4eb8f6b1af2135bec27bbbb7d8f12bb703 \
+    --hash=sha256:bc58d83eb610252fd8de6363e39d4f1d0619c894b0ed24603b881c02e64c7386
+isort==4.3.21 \
+    --hash=sha256:54da7e92468955c4fceacd0c86bd0ec997b0e1ee80d97f67c35a78b719dccab1 \
+    --hash=sha256:6e811fcb295968434526407adb8796944f1988c5b65e8139058f2014cbe100fd
+typed-ast==1.4.1 \
+    --hash=sha256:0666aa36131496aed8f7be0410ff974562ab7eeac11ef351def9ea6fa28f6355 \
+    --hash=sha256:0c2c07682d61a629b68433afb159376e24e5b2fd4641d35424e462169c0a7919 \
+    --hash=sha256:249862707802d40f7f29f6e1aad8d84b5aa9e44552d2cc17384b209f091276aa \
+    --hash=sha256:24995c843eb0ad11a4527b026b4dde3da70e1f2d8806c99b7b4a7cf491612652 \
+    --hash=sha256:269151951236b0f9a6f04015a9004084a5ab0d5f19b57de779f908621e7d8b75 \
+    --hash=sha256:4083861b0aa07990b619bd7ddc365eb7fa4b817e99cf5f8d9cf21a42780f6e01 \
+    --hash=sha256:498b0f36cc7054c1fead3d7fc59d2150f4d5c6c56ba7fb150c013fbc683a8d2d \
+    --hash=sha256:4e3e5da80ccbebfff202a67bf900d081906c358ccc3d5e3c8aea42fdfdfd51c1 \
+    --hash=sha256:6daac9731f172c2a22ade6ed0c00197ee7cc1221aa84cfdf9c31defeb059a907 \
+    --hash=sha256:715ff2f2df46121071622063fc7543d9b1fd19ebfc4f5c8895af64a77a8c852c \
+    --hash=sha256:73d785a950fc82dd2a25897d525d003f6378d1cb23ab305578394694202a58c3 \
+    --hash=sha256:8c8aaad94455178e3187ab22c8b01a3837f8ee50e09cf31f1ba129eb293ec30b \
+    --hash=sha256:8ce678dbaf790dbdb3eba24056d5364fb45944f33553dd5869b7580cdbb83614 \
+    --hash=sha256:aaee9905aee35ba5905cfb3c62f3e83b3bec7b39413f0a7f19be4e547ea01ebb \
+    --hash=sha256:bcd3b13b56ea479b3650b82cabd6b5343a625b0ced5429e4ccad28a8973f301b \
+    --hash=sha256:c9e348e02e4d2b4a8b2eedb48210430658df6951fa484e59de33ff773fbd4b41 \
+    --hash=sha256:d205b1b46085271b4e15f670058ce182bd1199e56b317bf2ec004b6a44f911f6 \
+    --hash=sha256:d43943ef777f9a1c42bf4e552ba23ac77a6351de620aa9acf64ad54933ad4d34 \
+    --hash=sha256:d5d33e9e7af3b34a40dc05f498939f0ebf187f07c385fd58d591c533ad8562fe \
+    --hash=sha256:fc0fea399acb12edbf8a628ba8d2312f583bdbdb3335635db062fa98cf71fca4 \
+    --hash=sha256:fe460b922ec15dd205595c9b5b99e2f056fd98ae8f9f56b888e7a17dc2b757e7
+colorama==0.4.3; sys_platform == "win32" \
+    --hash=sha256:7d73d2a99753107a36ac6b455ee49046802e59d9d076ef8e47b61499fa29afff \
+    --hash=sha256:e96da0d330793e2cb9485e9ddfd918d456036c7149416295932478192f4436a1
diff --git a/tools/lint/rejected-words.yml b/tools/lint/rejected-words.yml
new file mode 100644
index 0000000000..39f3392167
--- /dev/null
+++ b/tools/lint/rejected-words.yml
@@ -0,0 +1,484 @@
+---
+avoid-blacklist-and-whitelist:
+    description: "Use words like 'skip', 'select', 'allow' or 'deny' instead"
+    level: error
+    include: ['.']
+    type: regex
+    payload: (black|white)[-_]?list
+    ignore-case: true
+    # same as codespell
+    extensions:
+        - js
+        - jsm
+        - jxs
+        - xml
+        - html
+        - xhtml
+        - cpp
+        - c
+        - h
+        - configure
+        - py
+        - properties
+        - rst
+        - md
+        - ftl
+        - yml
+    exclude:
+        - browser/app/profile/firefox.js
+        - browser/app/winlauncher/LauncherProcessWin.cpp
+        - browser/base/content/browser.js
+        - browser/base/content/contentTheme.js
+        - browser/base/content/test/general/browser_remoteTroubleshoot.js
+        - browser/base/content/test/general/browser_tab_drag_drop_perwindow.js
+        - browser/base/content/test/performance/browser_preferences_usage.js
+        - browser/base/content/test/protectionsUI/browser_protectionsUI_cryptominers.js
+        - browser/base/content/test/protectionsUI/browser_protectionsUI_fingerprinters.js
+        - browser/base/content/test/protectionsUI/browser_protectionsUI_pbmode_exceptions.js
+        - browser/base/content/test/protectionsUI/browser_protectionsUI_report_breakage.js
+        - browser/base/content/test/protectionsUI/browser_protectionsUI_socialtracking.js
+        - browser/base/content/test/protectionsUI/browser_protectionsUI_state.js
+        - browser/base/content/test/siteIdentity/browser_no_mcb_for_loopback.js
+        - browser/base/content/test/siteIdentity/browser_no_mcb_for_onions.js
+        - browser/base/content/test/static/browser_all_files_referenced.js
+        - browser/base/content/test/static/browser_misused_characters_in_strings.js
+        - browser/base/content/test/static/browser_parsable_css.js
+        - browser/base/content/test/static/browser_parsable_script.js
+        - browser/base/content/test/tabMediaIndicator/browser_mute_webAudio.js
+        - browser/base/content/test/tabs/browser_new_file_whitelisted_http_tab.js
+        - browser/components/downloads/content/contentAreaDownloadsView.xhtml
+        - browser/components/enterprisepolicies/helpers/WebsiteFilter.jsm
+        - browser/components/migration/ChromeMigrationUtils.jsm
+        - browser/components/migration/ChromeProfileMigrator.jsm
+        - browser/components/newtab/data/content/activity-stream.bundle.js
+        - browser/components/ion/content/ion.js
+        - browser/components/preferences/privacy.inc.xhtml
+        - browser/components/preferences/privacy.js
+        - browser/components/resistfingerprinting/test/mochitest/test_bug1354633_media_error.html
+        - browser/components/safebrowsing/content/test/browser_whitelisted.js
+        - browser/components/sessionstore/ContentSessionStore.jsm
+        - browser/components/sessionstore/test/browser_crashedTabs.js
+        - browser/components/uitour/UITourChild.jsm
+        - browser/components/urlbar/tests/browser/browser_searchSingleWordNotification.js
+        - browser/components/urlbar/tests/browser/browser_UrlbarInput_trimURLs.js
+        - browser/components/urlbar/tests/unit/test_providerHeuristicFallback.js
+        - browser/components/urlbar/tests/unit/test_search_suggestions.js
+        - browser/components/urlbar/tests/unit/test_tokenizer.js
+        - browser/extensions/formautofill/FormAutofillSync.jsm
+        - browser/extensions/screenshots/background/main.js
+        - browser/modules/SitePermissions.jsm
+        - browser/tools/mozscreenshots/mozscreenshots/extension/configurations/PermissionPrompts.jsm
+        - build/clang-plugin/CustomMatchers.h
+        - build/clang-plugin/FopenUsageChecker.cpp
+        - build/clang-plugin/NaNExprChecker.cpp
+        - build/clang-plugin/NoPrincipalGetURI.cpp
+        - build/clang-plugin/tests/TestNANTestingExpr.cpp
+        - build/compare-mozconfig/compare-mozconfigs.py
+        - build/moz.configure/bindgen.configure
+        - build/moz.configure/toolchain.configure
+        - config/check_vanilla_allocations.py
+        - devtools/client/debugger/dist/parser-worker.js
+        - devtools/client/debugger/test/mochitest/examples/big-sourcemap_files/bundle.js
+        - devtools/client/debugger/test/mochitest/examples/ember/quickstart/dist/assets/vendor.js
+        - devtools/client/debugger/test/mochitest/examples/react/build/main.js
+        - devtools/client/debugger/test/mochitest/examples/react/build/service-worker.js
+        - devtools/client/inspector/markup/test/lib_babel_6.21.0_min.js
+        - devtools/client/inspector/markup/test/lib_react_dom_15.4.1.js
+        - docshell/base/nsDocShell.cpp
+        - docshell/base/URIFixup.jsm
+        - docshell/test/unit/test_URIFixup_info.js
+        - dom/base/Document.cpp
+        - dom/base/MaybeCrossOriginObject.cpp
+        - dom/base/MutationObservers.cpp
+        - dom/base/nsContentUtils.cpp
+        - dom/base/nsContentUtils.h
+        - dom/base/nsDataDocumentContentPolicy.cpp
+        - dom/base/nsGlobalWindowOuter.cpp
+        - dom/base/nsGlobalWindowOuter.h
+        - dom/base/nsTreeSanitizer.cpp
+        - dom/base/nsTreeSanitizer.h
+        - dom/base/test/browser_multiple_popups.js
+        - dom/base/test/browser_timeout_throttling_with_audio_playback.js
+        - dom/base/test/chrome/test_permission_isHandlingUserInput.xhtml
+        - dom/bindings/Codegen.py
+        - dom/bindings/parser/WebIDL.py
+        - dom/bindings/RemoteObjectProxy.cpp
+        - dom/canvas/WebGLContext.cpp
+        - dom/events/EventStateManager.cpp
+        - dom/events/KeyboardEvent.cpp
+        - dom/html/MediaError.cpp
+        - dom/indexedDB/ActorsParent.cpp
+        - dom/ipc/ContentParent.cpp
+        - dom/ipc/fuzztest/content_parent_ipc_libfuzz.cpp
+        - dom/ipc/URLClassifierParent.cpp
+        - dom/media/autoplay/AutoplayPolicy.cpp
+        - dom/media/gmp/GMPChild.cpp
+        - dom/media/ipc/RDDProcessManager.cpp
+        - dom/media/ipc/RemoteDecoderManagerParent.cpp
+        - dom/media/MediaManager.cpp
+        - dom/media/mp4/MP4Decoder.cpp
+        - dom/media/platforms/apple/AppleVTDecoder.cpp
+        - dom/media/platforms/wmf/DXVA2Manager.cpp
+        - dom/media/platforms/wmf/WMFVideoMFTManager.cpp
+        - dom/media/autoplay/test/mochitest/file_autoplay_policy_key_blacklist.html
+        - dom/media/autoplay/test/mochitest/test_autoplay_policy_key_blacklist.html
+        - dom/media/autoplay/test/mochitest/test_autoplay_policy_permission.html
+        - dom/media/webm/WebMDecoder.cpp
+        - dom/media/webrtc/jsapi/PeerConnectionMedia.cpp
+        - dom/media/webrtc/libwebrtcglue/VideoConduit.cpp
+        - dom/media/webrtc/transport/stun_socket_filter.cpp
+        - dom/media/webrtc/transport/test/ice_unittest.cpp
+        - dom/plugins/base/nsPluginHost.h
+        - dom/plugins/ipc/PluginQuirks.cpp
+        - dom/push/PushServiceWebSocket.jsm
+        - dom/security/nsCSPContext.cpp
+        - dom/security/nsCSPService.cpp
+        - dom/security/nsCSPUtils.cpp
+        - dom/security/nsCSPUtils.h
+        - dom/security/nsMixedContentBlocker.cpp
+        - dom/security/ReferrerInfo.cpp
+        - dom/security/ReferrerInfo.h
+        - dom/security/test/csp/file_bug802872.js
+        - dom/security/test/csp/file_ignore_unsafe_inline.html
+        - dom/security/test/csp/file_nonce_source.html
+        - dom/security/test/csp/test_blob_data_schemes.html
+        - dom/security/test/csp/test_bug802872.html
+        - dom/security/test/csp/test_nonce_snapshot.html
+        - dom/security/test/csp/test_path_matching_redirect.html
+        - dom/security/test/csp/test_punycode_host_src.html
+        - dom/security/test/csp/test_scheme_relative_sources.html
+        - dom/security/test/csp/test_strict_dynamic_default_src.html
+        - dom/security/test/csp/test_strict_dynamic.html
+        - dom/security/test/csp/test_upgrade_insecure.html
+        - dom/security/test/csp/test_win_open_blocked.html
+        - dom/security/test/csp/test_worker_src.html
+        - dom/security/test/unit/test_isOriginPotentiallyTrustworthy.js
+        - dom/serviceworkers/test/test_error_reporting.html
+        - dom/serviceworkers/test/test_openWindow.html
+        - dom/smil/SMILTimeValueSpec.cpp
+        - dom/smil/SMILTimeValueSpec.h
+        - dom/tests/mochitest/dom-level0/idn_child.html
+        - dom/tests/mochitest/dom-level0/test_setting_document.domain_idn.html
+        - dom/tests/mochitest/whatwg/test_postMessage_origin.xhtml
+        - gfx/gl/GLContextProviderWGL.cpp
+        - gfx/gl/GLUploadHelpers.cpp
+        - gfx/ipc/GPUProcessManager.cpp
+        - gfx/layers/ipc/fuzztest/compositor_manager_parent_ipc_libfuzz.cpp
+        - gfx/tests/mochitest/test_font_whitelist.html
+        - gfx/thebes/gfxDWriteFontList.cpp
+        - gfx/thebes/gfxFcPlatformFontList.cpp
+        - gfx/thebes/gfxFT2FontList.cpp
+        - gfx/thebes/gfxPlatform.cpp
+        - gfx/thebes/gfxPlatformFontList.cpp
+        - gfx/thebes/gfxPlatformFontList.h
+        - gfx/thebes/gfxUserFontSet.cpp
+        - gfx/thebes/gfxWindowsPlatform.cpp
+        - gfx/thebes/SharedFontList.cpp
+        - gfx/vr/ipc/VRProcessManager.cpp
+        - intl/strres/nsStringBundle.cpp
+        - ipc/glue/GeckoChildProcessHost.cpp
+        - js/src/debugger/DebugAPI.h
+        - js/src/devtools/rootAnalysis/analyzeHeapWrites.js
+        - js/src/gc/Heap.h
+        - js/src/jit/CodeGenerator.cpp
+        - js/src/jit-test/tests/auto-regress/bug687399.js
+        - js/src/jit-test/tests/basic/bug908915.js
+        - js/src/jit-test/tests/basic/missingArgTest2.js
+        - js/src/tests/non262/regress/regress-450369.js
+        - js/src/tests/test262/built-ins/JSON/stringify/replacer-array-proxy.js
+        - js/xpconnect/src/Sandbox.cpp
+        - js/xpconnect/src/XPCJSRuntime.cpp
+        - js/xpconnect/src/xpcpublic.h
+        - js/xpconnect/src/XPCWrappedNativeScope.cpp
+        - js/xpconnect/tests/unit/head_watchdog.js
+        - js/xpconnect/wrappers/FilteringWrapper.cpp
+        - js/xpconnect/wrappers/XrayWrapper.cpp
+        - layout/base/PositionedEventTargeting.cpp
+        - layout/base/PresShell.cpp
+        - layout/base/PresShell.h
+        - layout/reftests/css-placeholder/css-restrictions.html
+        - layout/style/test/test_computed_style_difference.html
+        - layout/tools/reftest/mach_commands.py
+        - layout/tools/reftest/mach_test_package_commands.py
+        - layout/tools/reftest/reftestcommandline.py
+        - layout/tools/reftest/runreftest.py
+        - layout/tools/reftest/selftest/conftest.py
+        - mfbt/Attributes.h
+        - mobile/android/app/geckoview-prefs.js
+        - mobile/android/app/mobile.js
+        - modules/libpref/docs/index.md
+        - modules/libpref/init/all.js
+        - mozglue/baseprofiler/core/platform.cpp
+        - mozglue/build/AsanOptions.cpp
+        - mozglue/misc/StackWalk.cpp
+        - netwerk/base/nsIOService.cpp
+        - netwerk/base/nsIOService.h
+        - netwerk/base/nsURLHelper.cpp
+        - netwerk/cache/nsDiskCacheDeviceSQL.cpp
+        - netwerk/cookie/CookieCommons.h
+        - netwerk/dns/nsHostResolver.cpp
+        - netwerk/dns/nsIDNService.cpp
+        - netwerk/dns/nsIDNService.h
+        - netwerk/dns/TRR.cpp
+        - netwerk/dns/TRR.h
+        - netwerk/dns/TRRServiceChild.cpp
+        - netwerk/dns/TRRService.cpp
+        - netwerk/dns/TRRService.h
+        - netwerk/dns/TRRServiceParent.cpp
+        - netwerk/ipc/DocumentLoadListener.cpp
+        - netwerk/protocol/about/nsAboutProtocolHandler.cpp
+        - netwerk/protocol/http/Http2Session.cpp
+        - netwerk/protocol/http/HttpBaseChannel.cpp
+        - netwerk/protocol/http/HttpConnectionMgrParent.cpp
+        - netwerk/protocol/http/HttpConnectionMgrShell.h
+        - netwerk/protocol/http/nsHttpChannel.cpp
+        - netwerk/protocol/http/nsHttpConnectionMgr.cpp
+        - netwerk/protocol/http/nsHttpHandler.cpp
+        - netwerk/protocol/http/nsHttpHandler.h
+        - netwerk/protocol/http/TRRServiceChannel.cpp
+        - netwerk/protocol/res/ExtensionProtocolHandler.cpp
+        - netwerk/protocol/viewsource/nsViewSourceChannel.cpp
+        - netwerk/protocol/websocket/BaseWebSocketChannel.cpp
+        - netwerk/socket/nsSOCKSSocketProvider.cpp
+        - netwerk/test/gtest/TestCookie.cpp
+        - netwerk/test/unit/head_trr.js
+        - netwerk/test/unit_ipc/test_dns_by_type_resolve_wrap.js
+        - netwerk/test/unit_ipc/test_trr_httpssvc_wrap.js
+        - netwerk/test/unit/test_bug396389.js
+        - netwerk/test/unit/test_bug427957.js
+        - netwerk/test/unit/test_bug464591.js
+        - netwerk/test/unit/test_bug479413.js
+        - netwerk/test/unit/test_cookie_blacklist.js
+        - netwerk/test/unit/test_dns_by_type_resolve.js
+        - netwerk/test/unit/test_idn_blacklist.js
+        - netwerk/test/unit/test_idn_urls.js
+        - netwerk/test/unit/test_trr_httpssvc.js
+        - netwerk/test/unit/test_trr.js
+        - netwerk/test/unit/test_use_httpssvc.js
+        - netwerk/url-classifier/AsyncUrlChannelClassifier.cpp
+        - netwerk/url-classifier/nsChannelClassifier.cpp
+        - netwerk/url-classifier/nsChannelClassifier.h
+        - netwerk/url-classifier/UrlClassifierCommon.cpp
+        - netwerk/url-classifier/UrlClassifierCommon.h
+        - netwerk/url-classifier/UrlClassifierFeatureBase.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureBase.h
+        - netwerk/url-classifier/UrlClassifierFeatureCryptominingAnnotation.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureCryptominingProtection.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureCustomTables.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureCustomTables.h
+        - netwerk/url-classifier/UrlClassifierFeatureFactory.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureFactory.h
+        - netwerk/url-classifier/UrlClassifierFeatureFingerprintingAnnotation.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureFingerprintingProtection.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureFlash.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureLoginReputation.cpp
+        - netwerk/url-classifier/UrlClassifierFeaturePhishingProtection.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureSocialTrackingAnnotation.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureSocialTrackingProtection.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureTrackingAnnotation.cpp
+        - netwerk/url-classifier/UrlClassifierFeatureTrackingProtection.cpp
+        - python/mach/mach/dispatcher.py
+        - python/mozbuild/mozbuild/backend/recursivemake.py
+        - python/mozbuild/mozbuild/configure/options.py
+        - python/mozbuild/mozbuild/vendor/moz_yaml.py
+        - python/mozbuild/mozbuild/vendor/vendor_rust.py
+        - remote/Protocol.jsm
+        - security/certverifier/NSSCertDBTrustDomain.cpp
+        - security/certverifier/TrustOverrideUtils.h
+        - security/manager/ssl/DataStorageList.h
+        - security/manager/ssl/nsNSSIOLayer.cpp
+        - security/manager/ssl/tests/unit/test_ev_certs.js
+        - security/manager/ssl/tests/unit/test_intermediate_preloads.js
+        - security/manager/ssl/tests/unit/test_sanctions_symantec_apple_google.js
+        - security/manager/ssl/tests/unit/tlsserver/cmd/SanctionsTestServer.cpp
+        - security/sandbox/linux/broker/SandboxBroker.cpp
+        - security/sandbox/linux/broker/SandboxBroker.h
+        - security/sandbox/linux/broker/SandboxBrokerPolicyFactory.cpp
+        - security/sandbox/linux/glue/SandboxPrefBridge.cpp
+        - security/sandbox/linux/gtest/TestBroker.cpp
+        - security/sandbox/linux/launch/SandboxLaunch.cpp
+        - security/sandbox/linux/Sandbox.cpp
+        - security/sandbox/linux/SandboxFilter.cpp
+        - security/sandbox/linux/SandboxFilterUtil.h
+        - security/sandbox/linux/Sandbox.h
+        - services/automation/ServicesAutomation.jsm
+        - services/fxaccounts/FxAccountsCommon.js
+        - services/fxaccounts/FxAccounts.jsm
+        - services/sync/modules/engines/addons.js
+        - taskcluster/ci/docker-image/kind.yml
+        - taskcluster/taskgraph/actions/create_interactive.py
+        - taskcluster/taskgraph/target_tasks.py
+        - taskcluster/taskgraph/transforms/tests.py
+        - taskcluster/taskgraph/try_option_syntax.py
+        - taskcluster/taskgraph/util/schema.py
+        - taskcluster/test/test_mach_try_auto.py
+        - testing/condprofile/condprof/client.py
+        - testing/condprofile/condprof/tests/profile/prefs.js
+        - testing/condprofile/condprof/tests/test_client.py
+        - testing/firefox-ui/tests/functional/safebrowsing/test_initial_download.py
+        - testing/marionette/client/marionette_driver/wait.py
+        - testing/mochitest/browser-test.js
+        - testing/mochitest/mach_test_package_commands.py
+        - testing/mochitest/mochitest_options.py
+        - testing/mochitest/runtests.py
+        - testing/mozbase/mozprofile/mozprofile/profile.py
+        - testing/mozharness/configs/unittests/linux_unittest.py
+        - testing/mozharness/configs/unittests/mac_unittest.py
+        - testing/mozharness/configs/unittests/win_unittest.py
+        - testing/profiles/unittest-required/user.js
+        - testing/raptor/browsertime/browsertime_scenario.js
+        - testing/raptor/raptor/control_server.py
+        - testing/raptor/raptor/manifest.py
+        - testing/specialpowers/content/SpecialPowersChild.jsm
+        - testing/talos/talos/mainthreadio.py
+        - testing/talos/talos/tests/devtools/addon/content/pages/custom/debugger/static/js/main.js
+        - testing/talos/talos/whitelist.py
+        - testing/talos/talos/xtalos/etlparser.py
+        - testing/talos/talos/xtalos/xtalos.py
+        - testing/web-platform/tests/common/security-features/README.md
+        - testing/web-platform/tests/docs/writing-tests/general-guidelines.md
+        - testing/web-platform/tests/docs/writing-tests/lint-tool.md
+        - testing/web-platform/tests/tools/manifest/tests/test_manifest.py
+        - toolkit/actors/RemotePageChild.jsm
+        - toolkit/actors/WebChannelChild.jsm
+        - toolkit/components/aboutperformance/content/aboutPerformance.js
+        - toolkit/components/antitracking/ContentBlocking.cpp
+        - toolkit/components/antitracking/PurgeTrackerService.jsm
+        - toolkit/components/antitracking/StorageAccess.cpp
+        - toolkit/components/antitracking/test/browser/antitracking_head.js
+        - toolkit/components/antitracking/test/browser/browser_siteSpecificWorkArounds.js
+        - toolkit/components/antitracking/test/browser/browser_socialtracking_save_image.js
+        - toolkit/components/antitracking/test/xpcshell/test_rejectForeignAllowList.js
+        - toolkit/components/crashes/CrashManager.jsm
+        - toolkit/components/crashes/tests/xpcshell/test_crash_manager.js
+        - toolkit/components/extensions/Extension.jsm
+        - toolkit/components/extensions/test/xpcshell/test_WebExtensionPolicy.js
+        - toolkit/components/remotepagemanager/RemotePageManagerParent.jsm
+        - toolkit/components/reputationservice/ApplicationReputation.cpp
+        - toolkit/components/reputationservice/chromium/chrome/common/safe_browsing/csd.pb.h
+        - toolkit/components/reputationservice/LoginReputation.cpp
+        - toolkit/components/reputationservice/LoginReputation.h
+        - toolkit/components/reputationservice/test/unit/head_download_manager.js
+        - toolkit/components/reputationservice/test/unit/test_app_rep.js
+        - toolkit/components/reputationservice/test/unit/test_app_rep_maclinux.js
+        - toolkit/components/reputationservice/test/unit/test_app_rep_windows.js
+        - toolkit/components/reputationservice/test/unit/test_login_rep.js
+        - toolkit/components/satchel/test/test_form_autocomplete.html
+        - toolkit/components/search/SearchService.jsm
+        - toolkit/components/search/tests/xpcshell/test_override_allowlist.js
+        - toolkit/components/telemetry/docs/data/environment.rst
+        - toolkit/components/url-classifier/LookupCache.cpp
+        - toolkit/components/url-classifier/LookupCache.h
+        - toolkit/components/url-classifier/nsUrlClassifierDBService.cpp
+        - toolkit/components/url-classifier/nsUrlClassifierUtils.cpp
+        - toolkit/components/url-classifier/SafeBrowsing.jsm
+        - toolkit/components/url-classifier/tests/mochitest/features.js
+        - toolkit/components/url-classifier/tests/mochitest/good.js
+        - toolkit/components/url-classifier/tests/mochitest/test_annotation_vs_TP.html
+        - toolkit/components/url-classifier/tests/mochitest/test_classified_annotations.html
+        - toolkit/components/url-classifier/tests/mochitest/test_classify_by_default.html
+        - toolkit/components/url-classifier/tests/mochitest/test_classify_ping.html
+        - toolkit/components/url-classifier/tests/mochitest/test_classify_track.html
+        - toolkit/components/url-classifier/tests/mochitest/test_cryptomining_annotate.html
+        - toolkit/components/url-classifier/tests/mochitest/test_cryptomining.html
+        - toolkit/components/url-classifier/tests/mochitest/test_fingerprinting_annotate.html
+        - toolkit/components/url-classifier/tests/mochitest/test_fingerprinting.html
+        - toolkit/components/url-classifier/tests/mochitest/test_privatebrowsing_trackingprotection.html
+        - toolkit/components/url-classifier/tests/mochitest/test_safebrowsing_bug1272239.html
+        - toolkit/components/url-classifier/tests/mochitest/test_socialtracking_annotate.html
+        - toolkit/components/url-classifier/tests/mochitest/test_socialtracking.html
+        - toolkit/components/url-classifier/tests/mochitest/test_trackingprotection_bug1312515.html
+        - toolkit/components/url-classifier/tests/mochitest/test_trackingprotection_bug1580416.html
+        - toolkit/components/url-classifier/tests/mochitest/test_trackingprotection_whitelist.html
+        - toolkit/components/url-classifier/tests/mochitest/trackingRequest.html
+        - toolkit/components/url-classifier/tests/unit/head_urlclassifier.js
+        - toolkit/components/url-classifier/tests/unit/test_digest256.js
+        - toolkit/components/url-classifier/tests/unit/test_features.js
+        - toolkit/components/url-classifier/tests/unit/test_platform_specific_threats.js
+        - toolkit/components/url-classifier/tests/UrlClassifierTestUtils.jsm
+        - toolkit/content/aboutSupport.js
+        - toolkit/content/aboutTelemetry.js
+        - toolkit/content/aboutUrlClassifier.js
+        - toolkit/content/aboutUrlClassifier.xhtml
+        - toolkit/content/tests/browser/browser_delay_autoplay_webAudio.js
+        - toolkit/crashreporter/client/ping.cpp
+        - toolkit/crashreporter/CrashAnnotations.cpp
+        - toolkit/crashreporter/generate_crash_reporter_sources.py
+        - toolkit/modules/BrowserUtils.jsm
+        - toolkit/modules/E10SUtils.jsm
+        - toolkit/modules/PermissionsUtils.jsm
+        - toolkit/modules/RemotePageAccessManager.jsm
+        - toolkit/modules/tests/browser/browser_AsyncPrefs.js
+        - toolkit/modules/tests/browser/browser_Troubleshoot.js
+        - toolkit/modules/tests/browser/browser_web_channel.js
+        - toolkit/modules/tests/xpcshell/test_PermissionsUtils.js
+        - toolkit/modules/third_party/jsesc/jsesc.js
+        - toolkit/modules/Troubleshoot.jsm
+        - toolkit/mozapps/extensions/internal/XPIInstall.jsm
+        - toolkit/mozapps/extensions/internal/XPIProvider.jsm
+        - toolkit/mozapps/extensions/test/browser/browser_html_discover_view.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_Device.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_DriverNew.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_Equal_DriverNew.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_Equal_DriverOld.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_Equal_OK.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_GTE_DriverOld.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_GTE_OK.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_No_Comparison.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_OK.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_OS.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_OSVersion_match.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_OSVersion_mismatch_DriverVersion.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_OSVersion_mismatch_OSVersion.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_prefs.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_Vendor.js
+        - toolkit/mozapps/extensions/test/xpcshell/rs-blocklist/test_gfxBlacklist_Version.js
+        - toolkit/mozapps/extensions/test/xpcshell/test_permissions.js
+        - toolkit/mozapps/extensions/test/xpcshell/test_permissions_prefs.js
+        - toolkit/mozapps/extensions/test/xpinstall/browser_bug645699.js
+        - toolkit/mozapps/extensions/test/xpinstall/browser_doorhanger_installs.js
+        - toolkit/mozapps/extensions/test/xpinstall/browser_localfile3.js
+        - toolkit/mozapps/extensions/test/xpinstall/browser_localfile4.js
+        - toolkit/mozapps/extensions/test/xpinstall/browser_localfile4_postDownload.js
+        - toolkit/mozapps/extensions/test/xpinstall/browser_whitelist.js
+        - toolkit/mozapps/extensions/test/xpinstall/head.js
+        - toolkit/xre/nsAppRunner.cpp
+        - toolkit/xre/nsEmbedFunctions.cpp
+        - toolkit/xre/nsXREDirProvider.cpp
+        - tools/crashreporter/system-symbols/win/symsrv-fetch.py
+        - tools/fuzzing/faulty/Faulty.cpp
+        - tools/fuzzing/faulty/Faulty.h
+        - tools/fuzzing/ipc/ProtocolFuzzer.cpp
+        - tools/fuzzing/ipc/ProtocolFuzzer.h
+        - tools/fuzzing/messagemanager/MessageManagerFuzzer.cpp
+        - tools/fuzzing/messagemanager/MessageManagerFuzzer.h
+        - tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-define-cc-etc.js
+        - tools/lint/rejected-words.yml
+        - tools/lint/test/test_codespell.py
+        - tools/profiler/core/platform.cpp
+        - tools/tryselect/selectors/chooser/__init__.py
+        - tools/tryselect/task_config.py
+        - uriloader/prefetch/nsOfflineCacheUpdate.cpp
+        - widget/android/GfxInfo.cpp
+        - widget/GfxInfoBase.cpp
+        - widget/gtk/IMContextWrapper.cpp
+        - widget/gtk/nsAppShell.cpp
+        - widget/windows/GfxInfo.cpp
+        - widget/windows/WinUtils.cpp
+        - widget/windows/WinUtils.h
+        - xpcom/base/CycleCollectedJSRuntime.cpp
+        - xpcom/base/ErrorList.py
+        - xpcom/idl-parser/xpidl/xpidl.py
+        - xpcom/io/FilePreferences.cpp
+        - xpcom/io/FilePreferences.h
+        - xpcom/reflect/xptcall/md/unix/xptcinvoke_arm.cpp
+        - xpcom/reflect/xptcall/md/unix/xptcinvoke_linux_s390.cpp
+        - xpcom/reflect/xptcall/md/unix/xptcinvoke_linux_s390x.cpp
+        - xpcom/tests/gtest/TestFilePreferencesUnix.cpp
+        - xpcom/tests/gtest/TestFilePreferencesWin.cpp
+        - xpcom/threads/nsThreadUtils.h
+
+# ---
+# Disable for now. Needs some dev to handle this
+# avoid-master-and-slave:
+#    description: "Use words like 'controller', 'worker' instead"
diff --git a/tools/lint/rst.yml b/tools/lint/rst.yml
new file mode 100644
index 0000000000..3f35fe7def
--- /dev/null
+++ b/tools/lint/rst.yml
@@ -0,0 +1,11 @@
+---
+rst:
+    description: RST linter
+    include: [.]
+    extensions:
+        - rst
+    support-files:
+        - 'tools/lint/rst/**'
+    type: external
+    payload: rst:lint
+    setup: rst:setup
diff --git a/tools/lint/rst/__init__.py b/tools/lint/rst/__init__.py
new file mode 100644
index 0000000000..1852d0f530
--- /dev/null
+++ b/tools/lint/rst/__init__.py
@@ -0,0 +1,107 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import re
+import subprocess
+
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+from mozfile import which
+
+# Error Levels
+# (0, 'debug')
+# (1, 'info')
+# (2, 'warning')
+# (3, 'error')
+# (4, 'severe')
+
+abspath = os.path.abspath(os.path.dirname(__file__))
+rstcheck_requirements_file = os.path.join(abspath, "requirements.txt")
+
+results = []
+
+RSTCHECK_NOT_FOUND = """
+Could not find rstcheck! Install rstcheck and try again.
+
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    rstcheck_requirements_file
+)
+
+RSTCHECK_INSTALL_ERROR = """
+Unable to install required version of rstcheck
+Try to install it manually with:
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    rstcheck_requirements_file
+)
+
+RSTCHECK_FORMAT_REGEX = re.compile(r"(.*):(.*): \(.*/([0-9]*)\) (.*)$")
+
+
+def setup(root, **lintargs):
+    virtualenv_manager = lintargs["virtualenv_manager"]
+    try:
+        virtualenv_manager.install_pip_requirements(
+            rstcheck_requirements_file, quiet=True
+        )
+    except subprocess.CalledProcessError:
+        print(RSTCHECK_INSTALL_ERROR)
+        return 1
+
+
+def get_rstcheck_binary():
+    """
+    Returns the path of the first rstcheck binary available
+    if not found returns None
+    """
+    binary = os.environ.get("RSTCHECK")
+    if binary:
+        return binary
+
+    return which("rstcheck")
+
+
+def parse_with_split(errors):
+    match = RSTCHECK_FORMAT_REGEX.match(errors)
+    filename, lineno, level, message = match.groups()
+
+    return filename, lineno, level, message
+
+
+def lint(files, config, **lintargs):
+    log = lintargs["log"]
+    config["root"] = lintargs["root"]
+    paths = expand_exclusions(files, config, config["root"])
+    paths = list(paths)
+    chunk_size = 50
+    binary = get_rstcheck_binary()
+    rstcheck_options = "--ignore-language=cpp,json"
+
+    while paths:
+        cmdargs = [which("python"), binary, rstcheck_options] + paths[:chunk_size]
+        log.debug("Command: {}".format(" ".join(cmdargs)))
+
+        proc = subprocess.Popen(
+            cmdargs,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            env=os.environ,
+            universal_newlines=True,
+        )
+        all_errors = proc.communicate()[1]
+        for errors in all_errors.split("\n"):
+            if len(errors) > 1:
+                filename, lineno, level, message = parse_with_split(errors)
+                res = {
+                    "path": filename,
+                    "message": message,
+                    "lineno": lineno,
+                    "level": "error" if int(level) >= 2 else "warning",
+                }
+                results.append(result.from_config(config, **res))
+        paths = paths[chunk_size:]
+
+    return results
diff --git a/tools/lint/rst/requirements.in b/tools/lint/rst/requirements.in
new file mode 100644
index 0000000000..72419556fd
--- /dev/null
+++ b/tools/lint/rst/requirements.in
@@ -0,0 +1,2 @@
+rstcheck==3.3.1
+Pygments==2.6.1
diff --git a/tools/lint/rst/requirements.txt b/tools/lint/rst/requirements.txt
new file mode 100644
index 0000000000..45fe3ea82f
--- /dev/null
+++ b/tools/lint/rst/requirements.txt
@@ -0,0 +1,18 @@
+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    pip-compile --generate-hashes --output-file=tools/lint/rst/requirements.txt tools/lint/rst/requirements.in
+#
+docutils==0.14 \
+    --hash=sha256:02aec4bd92ab067f6ff27a38a38a41173bf01bed8f89157768c1573f53e474a6 \
+    --hash=sha256:51e64ef2ebfb29cae1faa133b3710143496eca21c530f3f71424d77687764274 \
+    --hash=sha256:7a4bd47eaf6596e1295ecb11361139febe29b084a87bf005bf899f9a42edc3c6 \
+    # via rstcheck
+pygments==2.6.1 \
+    --hash=sha256:647344a061c249a3b74e230c739f434d7ea4d8b1d5f3721bc0f3558049b38f44 \
+    --hash=sha256:ff7a40b4860b727ab48fad6360eb351cc1b33cbf9b15a0f689ca5353e9463324 \
+    # via -r tools/lint/rst/requirements.in
+rstcheck==3.3.1 \
+    --hash=sha256:92c4f79256a54270e0402ba16a2f92d0b3c15c8f4410cb9c57127067c215741f \
+    # via -r tools/lint/rst/requirements.in
diff --git a/tools/lint/rust/__init__.py b/tools/lint/rust/__init__.py
new file mode 100644
index 0000000000..60135adcab
--- /dev/null
+++ b/tools/lint/rust/__init__.py
@@ -0,0 +1,171 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import signal
+import six
+import re
+import subprocess
+from collections import namedtuple
+from distutils.version import StrictVersion
+
+from mozfile import which
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+from mozprocess import ProcessHandler
+
+
+RUSTFMT_NOT_FOUND = """
+Could not find rustfmt! Install rustfmt and try again.
+
+    $ rustup component add rustfmt
+
+And make sure that it is in the PATH
+""".strip()
+
+
+RUSTFMT_INSTALL_ERROR = """
+Unable to install correct version of rustfmt
+Try to install it manually with:
+    $ rustup component add rustfmt
+""".strip()
+
+
+RUSTFMT_WRONG_VERSION = """
+You are probably using an old version of rustfmt.
+Expected version is {version}.
+Try to update it:
+    $ rustup update stable
+""".strip()
+
+
+def parse_issues(config, output, paths):
+    RustfmtDiff = namedtuple("RustfmtDiff", ["file", "line", "diff"])
+    issues = []
+    diff_line = re.compile("^Diff in (.*) at line ([0-9]*):")
+    file = ""
+    line_no = 0
+    diff = ""
+    for line in output:
+        line = six.ensure_text(line)
+        match = diff_line.match(line)
+        if match:
+            if diff:
+                issues.append(RustfmtDiff(file, line_no, diff.rstrip("\n")))
+                diff = ""
+            file, line_no = match.groups()
+        else:
+            diff += line + "\n"
+    # the algorithm above will always skip adding the last issue
+    issues.append(RustfmtDiff(file, line_no, diff))
+    results = []
+    for issue in issues:
+        # rustfmt can not be supplied the paths to the files we want to analyze
+        # therefore, for each issue detected, we check if any of the the paths
+        # supplied are part of the file name.
+        # This just filters out the issues that are not part of paths.
+        if any([path in file for path in paths]):
+            res = {
+                "path": issue.file,
+                "diff": issue.diff,
+                "level": "warning",
+                "lineno": issue.line,
+            }
+            results.append(result.from_config(config, **res))
+    return results
+
+
+class RustfmtProcess(ProcessHandler):
+    def __init__(self, config, *args, **kwargs):
+        self.config = config
+        kwargs["stream"] = False
+        ProcessHandler.__init__(self, *args, **kwargs)
+
+    def run(self, *args, **kwargs):
+        orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+        ProcessHandler.run(self, *args, **kwargs)
+        signal.signal(signal.SIGINT, orig)
+
+
+def run_process(config, cmd):
+    proc = RustfmtProcess(config, cmd)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+    return proc.output
+
+
+def get_rustfmt_binary():
+    """
+    Returns the path of the first rustfmt binary available
+    if not found returns None
+    """
+    binary = os.environ.get("RUSTFMT")
+    if binary:
+        return binary
+
+    return which("rustfmt")
+
+
+def get_rustfmt_version(binary):
+    """
+    Returns found binary's version
+    """
+    try:
+        output = subprocess.check_output(
+            [binary, "--version"],
+            stderr=subprocess.STDOUT,
+            universal_newlines=True,
+        )
+    except subprocess.CalledProcessError as e:
+        output = e.output
+
+    version = re.findall(r"\d.\d+.\d+", output)[0]
+    return StrictVersion(version)
+
+
+def lint(paths, config, fix=None, **lintargs):
+    log = lintargs["log"]
+    paths = list(expand_exclusions(paths, config, lintargs["root"]))
+
+    # An empty path array can occur when the user passes in `-n`. If we don't
+    # return early in this case, rustfmt will attempt to read stdin and hang.
+    if not paths:
+        return []
+
+    binary = get_rustfmt_binary()
+
+    if not binary:
+        print(RUSTFMT_NOT_FOUND)
+        if "MOZ_AUTOMATION" in os.environ:
+            return 1
+        return []
+
+    min_version_str = config.get("min_rustfmt_version")
+    min_version = StrictVersion(min_version_str)
+    actual_version = get_rustfmt_version(binary)
+    log.debug(
+        "Found version: {}. Minimal expected version: {}".format(
+            actual_version, min_version
+        )
+    )
+
+    if actual_version < min_version:
+        print(RUSTFMT_WRONG_VERSION.format(version=min_version_str))
+        return 1
+
+    cmd_args = [binary]
+    if not fix:
+        cmd_args.append("--check")
+    base_command = cmd_args + paths
+    log.debug("Command: {}".format(" ".join(cmd_args)))
+    output = run_process(config, base_command)
+
+    if fix:
+        # Rustfmt is able to fix all issues so don't bother parsing the output.
+        return []
+    return parse_issues(config, output, paths)
diff --git a/tools/lint/rustfmt.yml b/tools/lint/rustfmt.yml
new file mode 100644
index 0000000000..f5ad4c0b29
--- /dev/null
+++ b/tools/lint/rustfmt.yml
@@ -0,0 +1,25 @@
+---
+rust:
+    description: Reformat rust
+    min_rustfmt_version: 1.4.12
+    include:
+        - '.'
+    exclude:
+        - dom/webauthn/libudev-sys/
+        - gfx/wr/direct-composition/
+        - gfx/wr/peek-poke/
+        - gfx/wr/webrender_build/
+        - gfx/wgpu/
+        - gfx/wr/wr_malloc_size_of/
+        - media/audioipc/audioipc/src/
+        - media/audioipc/client/src/
+        - media/audioipc/server/src/
+        - media/mp4parse-rust/
+        - servo/
+    extensions:
+        - rs
+    support-files:
+        - 'tools/lint/rust/**'
+    type: external
+    payload: rust:lint
+    code_review_warnings: true
diff --git a/tools/lint/shell/__init__.py b/tools/lint/shell/__init__.py
new file mode 100644
index 0000000000..0c4a2ed96b
--- /dev/null
+++ b/tools/lint/shell/__init__.py
@@ -0,0 +1,149 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import json
+from json.decoder import JSONDecodeError
+
+import mozpack.path as mozpath
+from mozfile import which
+from mozpack.files import FileFinder
+
+from mozlint import result
+from mozlint.util.implementation import LintProcess
+
+SHELLCHECK_NOT_FOUND = """
+Unable to locate shellcheck, please ensure it is installed and in
+your PATH or set the SHELLCHECK environment variable.
+
+https://shellcheck.net or your system's package manager.
+""".strip()
+
+results = []
+
+
+class ShellcheckProcess(LintProcess):
+    def process_line(self, line):
+        try:
+            data = json.loads(line)
+        except JSONDecodeError as e:
+            print("Unable to load shellcheck output ({}): {}".format(e, line))
+            return
+
+        for entry in data:
+            res = {
+                "path": entry["file"],
+                "message": entry["message"],
+                "level": "error",
+                "lineno": entry["line"],
+                "column": entry["column"],
+                "rule": entry["code"],
+            }
+            results.append(result.from_config(self.config, **res))
+
+
+def determine_shell_from_script(path):
+    """Returns a string identifying the shell used.
+
+    Returns None if not identifiable.
+
+    Copes with the following styles:
+    #!bash
+    #!/bin/bash
+    #!/usr/bin/env bash
+    """
+    with open(path, "r") as f:
+        head = f.readline()
+
+        if not head.startswith("#!"):
+            return
+
+        # allow for parameters to the shell
+        shebang = head.split()[0]
+
+        # if the first entry is a variant of /usr/bin/env
+        if "env" in shebang:
+            shebang = head.split()[1]
+
+        if shebang.endswith("sh"):
+            # Strip first to avoid issues with #!bash
+            return shebang.strip("#!").split("/")[-1]
+    # make it clear we return None, rather than fall through.
+    return
+
+
+def find_shell_scripts(config, paths):
+    found = dict()
+
+    root = config["root"]
+    exclude = [mozpath.join(root, e) for e in config.get("exclude", [])]
+
+    if config.get("extensions"):
+        pattern = "**/*.{}".format(config.get("extensions")[0])
+    else:
+        pattern = "**/*.sh"
+
+    files = []
+    for path in paths:
+        path = mozpath.normsep(path)
+        ignore = [
+            e[len(path) :].lstrip("/")
+            for e in exclude
+            if mozpath.commonprefix((path, e)) == path
+        ]
+        finder = FileFinder(path, ignore=ignore)
+        files.extend([os.path.join(path, p) for p, f in finder.find(pattern)])
+
+    for filename in files:
+        shell = determine_shell_from_script(filename)
+        if shell:
+            found[filename] = shell
+    return found
+
+
+def run_process(config, cmd):
+    proc = ShellcheckProcess(config, cmd)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+
+def get_shellcheck_binary():
+    """
+    Returns the path of the first shellcheck binary available
+    if not found returns None
+    """
+    binary = os.environ.get("SHELLCHECK")
+    if binary:
+        return binary
+
+    return which("shellcheck")
+
+
+def lint(paths, config, **lintargs):
+    log = lintargs["log"]
+    binary = get_shellcheck_binary()
+
+    if not binary:
+        print(SHELLCHECK_NOT_FOUND)
+        if "MOZ_AUTOMATION" in os.environ:
+            return 1
+        return []
+
+    config["root"] = lintargs["root"]
+
+    files = find_shell_scripts(config, paths)
+
+    base_command = [binary, "-f", "json"]
+    if config.get("excludecodes"):
+        base_command.extend(["-e", ",".join(config.get("excludecodes"))])
+
+    for f in files:
+        cmd = list(base_command)
+        cmd.extend(["-s", files[f], f])
+        log.debug("Command: {}".format(cmd))
+        run_process(config, cmd)
+    return results
diff --git a/tools/lint/shellcheck.yml b/tools/lint/shellcheck.yml
new file mode 100644
index 0000000000..d0b390d4e8
--- /dev/null
+++ b/tools/lint/shellcheck.yml
@@ -0,0 +1,14 @@
+---
+shellcheck:
+    description: Shell script linter
+    include:
+        - taskcluster/docker/
+    exclude: []
+    # 1090: https://github.com/koalaman/shellcheck/wiki/SC1090
+    # 'Can't follow a non-constant source'
+    extensions: ['sh']
+    support-files:
+        - 'tools/lint/shell/**'
+    excludecodes: ['1090', '1091']
+    type: external
+    payload: shell:lint
diff --git a/tools/lint/spell/__init__.py b/tools/lint/spell/__init__.py
new file mode 100644
index 0000000000..7f692c8d4a
--- /dev/null
+++ b/tools/lint/spell/__init__.py
@@ -0,0 +1,147 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import re
+import subprocess
+
+# py2-compat
+try:
+    from json.decoder import JSONDecodeError
+except ImportError:
+    JSONDecodeError = ValueError
+
+from mozfile import which
+
+from mozlint import result
+from mozlint.util.implementation import LintProcess
+
+here = os.path.abspath(os.path.dirname(__file__))
+CODESPELL_REQUIREMENTS_PATH = os.path.join(here, "codespell_requirements.txt")
+
+CODESPELL_NOT_FOUND = """
+Could not find codespell! Install codespell and try again.
+
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    CODESPELL_REQUIREMENTS_PATH
+)
+
+
+CODESPELL_INSTALL_ERROR = """
+Unable to install correct version of codespell
+Try to install it manually with:
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    CODESPELL_REQUIREMENTS_PATH
+)
+
+results = []
+
+CODESPELL_FORMAT_REGEX = re.compile(r"(.*):(.*): (.*) ==> (.*)$")
+
+
+class CodespellProcess(LintProcess):
+    def process_line(self, line):
+        try:
+            match = CODESPELL_FORMAT_REGEX.match(line)
+            abspath, line, typo, correct = match.groups()
+        except AttributeError:
+            print("Unable to match regex against output: {}".format(line))
+            return
+
+        # Ignore false positive like aParent (which would be fixed to apparent)
+        # See https://github.com/lucasdemarchi/codespell/issues/314
+        m = re.match(r"^[a-z][A-Z][a-z]*", typo)
+        if m:
+            return
+        res = {
+            "path": abspath,
+            "message": typo.strip() + " ==> " + correct,
+            "level": "error",
+            "lineno": line,
+        }
+        results.append(result.from_config(self.config, **res))
+
+
+def run_process(config, cmd):
+    proc = CodespellProcess(config, cmd)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+
+def get_codespell_binary():
+    """
+    Returns the path of the first codespell binary available
+    if not found returns None
+    """
+    binary = os.environ.get("CODESPELL")
+    if binary:
+        return binary
+
+    return which("codespell")
+
+
+def setup(root, **lintargs):
+    virtualenv_manager = lintargs["virtualenv_manager"]
+    try:
+        virtualenv_manager.install_pip_requirements(
+            CODESPELL_REQUIREMENTS_PATH, quiet=True
+        )
+    except subprocess.CalledProcessError:
+        print(CODESPELL_INSTALL_ERROR)
+        return 1
+
+
+def get_codespell_version(binary):
+    return subprocess.check_output(
+        [which("python"), binary, "--version"],
+        universal_newlines=True,
+        stderr=subprocess.STDOUT,
+    )
+
+
+def lint(paths, config, fix=None, **lintargs):
+    log = lintargs["log"]
+    binary = get_codespell_binary()
+    if not binary:
+        print(CODESPELL_NOT_FOUND)
+        if "MOZ_AUTOMATION" in os.environ:
+            return 1
+        return []
+
+    config["root"] = lintargs["root"]
+
+    skip_files = ""
+    if "exclude" in config:
+        skip_files = "--skip=*.dic,{}".format(",".join(config["exclude"]))
+
+    exclude_list = os.path.join(here, "exclude-list.txt")
+    cmd_args = [
+        which("python"),
+        binary,
+        "--disable-colors",
+        # Silence some warnings:
+        # 1: disable warnings about wrong encoding
+        # 2: disable warnings about binary file
+        # 4: shut down warnings about automatic fixes
+        #    that were disabled in dictionary.
+        "--quiet-level=7",
+        "--ignore-words=" + exclude_list,
+        skip_files,
+    ]
+
+    if fix:
+        cmd_args.append("--write-changes")
+    log.debug("Command: {}".format(" ".join(cmd_args)))
+
+    log.debug("Version: {}".format(get_codespell_version(binary)))
+
+    base_command = cmd_args + paths
+
+    run_process(config, base_command)
+    return results
diff --git a/tools/lint/spell/codespell_requirements.txt b/tools/lint/spell/codespell_requirements.txt
new file mode 100644
index 0000000000..68bd95713b
--- /dev/null
+++ b/tools/lint/spell/codespell_requirements.txt
@@ -0,0 +1,4 @@
+codespell==2.0.0 \
+    --hash=sha256:a10b8bbb9f678e4edff7877af1f654fdc9e27c205f952c3ddee2981ad02ec5f2 \
+    --hash=sha256:dd9983e096b9f7ba89dd2d2466d1fc37231d060f19066331b9571341363c77b8
+
diff --git a/tools/lint/spell/exclude-list.txt b/tools/lint/spell/exclude-list.txt
new file mode 100644
index 0000000000..1b6f595099
--- /dev/null
+++ b/tools/lint/spell/exclude-list.txt
@@ -0,0 +1,17 @@
+cas
+optin
+aparent
+acount
+te
+wasn
+incrementall
+aare
+whats
+crate
+files'
+thru
+referer
+dur
+ue
+tring
+
diff --git a/tools/lint/test-disable.yml b/tools/lint/test-disable.yml
new file mode 100644
index 0000000000..7d93889704
--- /dev/null
+++ b/tools/lint/test-disable.yml
@@ -0,0 +1,16 @@
+---
+no-comment-disable:
+    description: >
+      "Use 'disabled=<reason>' to disable a test instead of a
+      comment"
+    include: ['.']
+    exclude:
+        - "**/application.ini"
+        - "**/l10n.ini"
+        - dom/canvas/test/webgl-conf/mochitest-errata.ini
+        - testing/mozbase/manifestparser/tests
+        - testing/web-platform
+        - xpcom/tests/unit/data
+    extensions: ['ini']
+    type: regex
+    payload: ^[ \t]*(#|;)[ \t]*\[
diff --git a/tools/lint/test/conftest.py b/tools/lint/test/conftest.py
new file mode 100644
index 0000000000..e9a6b01a2d
--- /dev/null
+++ b/tools/lint/test/conftest.py
@@ -0,0 +1,228 @@
+from __future__ import absolute_import, print_function
+
+import logging
+import os
+import sys
+from collections import defaultdict
+
+from mozbuild.base import MozbuildObject
+from mozlint.pathutils import findobject
+from mozlint.parser import Parser
+from mozlint.result import ResultSummary
+from mozlog.structuredlog import StructuredLogger
+from mozpack import path
+
+import pytest
+
+here = path.abspath(path.dirname(__file__))
+build = MozbuildObject.from_environment(cwd=here, virtualenv_name="python-test")
+
+lintdir = path.dirname(here)
+sys.path.insert(0, lintdir)
+logger = logging.getLogger("mozlint")
+
+
+def pytest_generate_tests(metafunc):
+    """Finds, loads and returns the config for the linter name specified by the
+    LINTER global variable in the calling module.
+
+    This implies that each test file (that uses this fixture) should only be
+    used to test a single linter. If no LINTER variable is defined, the test
+    will fail.
+    """
+    if "config" in metafunc.fixturenames:
+        if not hasattr(metafunc.module, "LINTER"):
+            pytest.fail(
+                "'config' fixture used from a module that didn't set the LINTER variable"
+            )
+
+        name = metafunc.module.LINTER
+        config_path = path.join(lintdir, "{}.yml".format(name))
+        parser = Parser(build.topsrcdir)
+        configs = parser.parse(config_path)
+        config_names = {config["name"] for config in configs}
+
+        marker = metafunc.definition.get_closest_marker("lint_config")
+        if marker:
+            config_name = marker.kwargs["name"]
+            if config_name not in config_names:
+                pytest.fail(f"lint config {config_name} not present in {name}.yml")
+            configs = [
+                config for config in configs if config["name"] == marker.kwargs["name"]
+            ]
+
+        ids = [config["name"] for config in configs]
+        metafunc.parametrize("config", configs, ids=ids)
+
+
+@pytest.fixture(scope="module")
+def root(request):
+    """Return the root directory for the files of the linter under test.
+
+    For example, with LINTER=flake8 this would be tools/lint/test/files/flake8.
+    """
+    if not hasattr(request.module, "LINTER"):
+        pytest.fail(
+            "'root' fixture used from a module that didn't set the LINTER variable"
+        )
+    return path.join(here, "files", request.module.LINTER)
+
+
+@pytest.fixture(scope="module")
+def paths(root):
+    """Return a function that can resolve file paths relative to the linter
+    under test.
+
+    Can be used like `paths('foo.py', 'bar/baz')`. This will return a list of
+    absolute paths under the `root` files directory.
+    """
+
+    def _inner(*paths):
+        if not paths:
+            return [root]
+        return [path.normpath(path.join(root, p)) for p in paths]
+
+    return _inner
+
+
+@pytest.fixture(autouse=True)
+def run_setup(config):
+    """Make sure that if the linter named in the LINTER global variable has a
+    setup function, it gets called before running the tests.
+    """
+    if "setup" not in config:
+        return
+
+    func = findobject(config["setup"])
+    func(build.topsrcdir, virtualenv_manager=build.virtualenv_manager)
+
+
+@pytest.fixture
+def lint(config, root):
+    """Find and return the 'lint' function for the external linter named in the
+    LINTER global variable.
+
+    This will automatically pass in the 'config' and 'root' arguments if not
+    specified.
+    """
+    try:
+        func = findobject(config["payload"])
+    except (ImportError, ValueError):
+        pytest.fail(
+            "could not resolve a lint function from '{}'".format(config["payload"])
+        )
+
+    ResultSummary.root = root
+
+    def wrapper(paths, config=config, root=root, collapse_results=False, **lintargs):
+        logger.setLevel(logging.DEBUG)
+        lintargs["log"] = logging.LoggerAdapter(
+            logger, {"lintname": config.get("name"), "pid": os.getpid()}
+        )
+        results = func(paths, config, root=root, **lintargs)
+
+        if isinstance(results, (list, tuple)):
+            results = sorted(results)
+
+        if not collapse_results:
+            return results
+
+        ret = defaultdict(list)
+        for r in results:
+            ret[r.relpath].append(r)
+        return ret
+
+    return wrapper
+
+
+@pytest.fixture
+def structuredlog_lint(config, root, logger=None):
+    """Find and return the 'lint' function for the external linter named in the
+    LINTER global variable. This variant of the lint function is for linters that
+    use the 'structuredlog' type.
+
+    This will automatically pass in the 'config' and 'root' arguments if not
+    specified.
+    """
+    try:
+        func = findobject(config["payload"])
+    except (ImportError, ValueError):
+        pytest.fail(
+            "could not resolve a lint function from '{}'".format(config["payload"])
+        )
+
+    ResultSummary.root = root
+
+    if not logger:
+        logger = structured_logger()
+
+    def wrapper(
+        paths,
+        config=config,
+        root=root,
+        logger=logger,
+        collapse_results=False,
+        **lintargs,
+    ):
+        lintargs["log"] = logging.LoggerAdapter(
+            logger, {"lintname": config.get("name"), "pid": os.getpid()}
+        )
+        results = func(paths, config, root=root, logger=logger, **lintargs)
+        if not collapse_results:
+            return results
+
+        ret = defaultdict(list)
+        for r in results:
+            ret[r.path].append(r)
+        return ret
+
+    return wrapper
+
+
+@pytest.fixture
+def create_temp_file(tmpdir):
+    def inner(contents, name=None):
+        name = name or "temp.py"
+        path = tmpdir.join(name)
+        path.write(contents)
+        return path.strpath
+
+    return inner
+
+
+@pytest.fixture
+def structured_logger():
+    return StructuredLogger("logger")
+
+
+@pytest.fixture
+def perfdocs_sample():
+    from test_perfdocs import (
+        SAMPLE_TEST,
+        SAMPLE_CONFIG,
+        temp_dir,
+        temp_file,
+    )
+
+    with temp_dir() as tmpdir:
+        suitedir = os.path.join(tmpdir, "suite")
+        perfdocs_dir = os.path.join(tmpdir, "perfdocs")
+        os.mkdir(perfdocs_dir)
+        os.mkdir(suitedir)
+
+        with temp_file(
+            "perftest.ini", tempdir=suitedir, content="[perftest_sample.js]"
+        ) as tmpmanifest, temp_file(
+            "perftest_sample.js", tempdir=suitedir, content=SAMPLE_TEST
+        ) as tmptest, temp_file(
+            "config.yml", tempdir=perfdocs_dir, content=SAMPLE_CONFIG
+        ) as tmpconfig, temp_file(
+            "index.rst", tempdir=perfdocs_dir, content="{documentation}"
+        ) as tmpindex:
+            yield {
+                "top_dir": tmpdir.replace("\\", "\\\\"),
+                "manifest": tmpmanifest,
+                "test": tmptest,
+                "config": tmpconfig,
+                "index": tmpindex,
+            }
diff --git a/tools/lint/test/files/black/bad.py b/tools/lint/test/files/black/bad.py
new file mode 100644
index 0000000000..0a50df4dd9
--- /dev/null
+++ b/tools/lint/test/files/black/bad.py
@@ -0,0 +1,6 @@
+# Any copyright is dedicated to the Public Domain.
+# http://creativecommons.org/publicdomain/zero/1.0/
+
+print (
+    "test"
+       )
diff --git a/tools/lint/test/files/black/invalid.py b/tools/lint/test/files/black/invalid.py
new file mode 100644
index 0000000000..079ecbad30
--- /dev/null
+++ b/tools/lint/test/files/black/invalid.py
@@ -0,0 +1,4 @@
+# Any copyright is dedicated to the Public Domain.
+# http://creativecommons.org/publicdomain/zero/1.0/
+
+print(
diff --git a/tools/lint/test/files/clang-format/bad/bad.cpp b/tools/lint/test/files/clang-format/bad/bad.cpp
new file mode 100644
index 0000000000..f08a83f795
--- /dev/null
+++ b/tools/lint/test/files/clang-format/bad/bad.cpp
@@ -0,0 +1,6 @@
+int  main ( ) { 
+
+return 0;   
+
+
+}
diff --git a/tools/lint/test/files/clang-format/bad/bad2.c b/tools/lint/test/files/clang-format/bad/bad2.c
new file mode 100644
index 0000000000..9792e85071
--- /dev/null
+++ b/tools/lint/test/files/clang-format/bad/bad2.c
@@ -0,0 +1,8 @@
+#include "bad2.h"
+
+
+int bad2() {
+  int a =2;
+  return a;
+
+}
diff --git a/tools/lint/test/files/clang-format/bad/bad2.h b/tools/lint/test/files/clang-format/bad/bad2.h
new file mode 100644
index 0000000000..a35d49d7e7
--- /dev/null
+++ b/tools/lint/test/files/clang-format/bad/bad2.h
@@ -0,0 +1 @@
+int bad2(void );
diff --git a/tools/lint/test/files/clang-format/bad/good.cpp b/tools/lint/test/files/clang-format/bad/good.cpp
new file mode 100644
index 0000000000..76e8197013
--- /dev/null
+++ b/tools/lint/test/files/clang-format/bad/good.cpp
@@ -0,0 +1 @@
+int main() { return 0; }
diff --git a/tools/lint/test/files/clang-format/good/foo.cpp b/tools/lint/test/files/clang-format/good/foo.cpp
new file mode 100644
index 0000000000..76e8197013
--- /dev/null
+++ b/tools/lint/test/files/clang-format/good/foo.cpp
@@ -0,0 +1 @@
+int main() { return 0; }
diff --git a/tools/lint/test/files/clippy/test1/Cargo.toml b/tools/lint/test/files/clippy/test1/Cargo.toml
new file mode 100644
index 0000000000..92d5072eca
--- /dev/null
+++ b/tools/lint/test/files/clippy/test1/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "hello_world" # the name of the package
+version = "0.1.0"    # the current version, obeying semver
+authors = ["Alice <a@example.com>", "Bob <b@example.com>"]
+
+[[bin]]
+name ="good"
+path = "good.rs"
+
+[[bin]]
+name ="bad"
+path = "bad.rs"
+
+[[bin]]
+name ="bad2"
+path = "bad2.rs"
+
diff --git a/tools/lint/test/files/clippy/test1/bad.rs b/tools/lint/test/files/clippy/test1/bad.rs
new file mode 100644
index 0000000000..c403fba603
--- /dev/null
+++ b/tools/lint/test/files/clippy/test1/bad.rs
@@ -0,0 +1,14 @@
+fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+    // Clippy detects this as a swap and considers this as an error
+    let mut a=1;
+    let mut b=1;
+
+    a = b;
+    b = a;
+
+
+}
diff --git a/tools/lint/test/files/clippy/test1/bad2.rs b/tools/lint/test/files/clippy/test1/bad2.rs
new file mode 100644
index 0000000000..a4236a2de7
--- /dev/null
+++ b/tools/lint/test/files/clippy/test1/bad2.rs
@@ -0,0 +1,17 @@
+fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+    let mut a;
+    let mut b=1;
+    let mut vec = Vec::new();
+    vec.push(1);
+    vec.push(2);
+
+
+    for x in 5..10 - 5 {
+        a = x;
+    }
+
+    }
diff --git a/tools/lint/test/files/clippy/test1/good.rs b/tools/lint/test/files/clippy/test1/good.rs
new file mode 100644
index 0000000000..9bcaee67b7
--- /dev/null
+++ b/tools/lint/test/files/clippy/test1/good.rs
@@ -0,0 +1,6 @@
+fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+}
diff --git a/tools/lint/test/files/clippy/test2/Cargo.lock b/tools/lint/test/files/clippy/test2/Cargo.lock
new file mode 100644
index 0000000000..6b2bc69eeb
--- /dev/null
+++ b/tools/lint/test/files/clippy/test2/Cargo.lock
@@ -0,0 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "hello_world_2"
+version = "0.2.0"
diff --git a/tools/lint/test/files/clippy/test2/Cargo.toml b/tools/lint/test/files/clippy/test2/Cargo.toml
new file mode 100644
index 0000000000..b0ac992088
--- /dev/null
+++ b/tools/lint/test/files/clippy/test2/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "hello_world_2" # the name of the package
+version = "0.2.0"    # the current version, obeying semver
+authors = ["Alice <a@example.com>", "Bob <b@example.com>"]
+
+[[bin]]
+name = "fake_lib1"
+path = "src/bad_1.rs"
diff --git a/tools/lint/test/files/clippy/test2/src/bad_1.rs b/tools/lint/test/files/clippy/test2/src/bad_1.rs
new file mode 100644
index 0000000000..2fe0630202
--- /dev/null
+++ b/tools/lint/test/files/clippy/test2/src/bad_1.rs
@@ -0,0 +1,15 @@
+mod bad_2;
+
+fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+    // Clippy detects this as a swap and considers this as an error
+    let mut a=1;
+    let mut b=1;
+
+    a = b;
+    b = a;
+
+}
diff --git a/tools/lint/test/files/clippy/test2/src/bad_2.rs b/tools/lint/test/files/clippy/test2/src/bad_2.rs
new file mode 100644
index 0000000000..f77de330b4
--- /dev/null
+++ b/tools/lint/test/files/clippy/test2/src/bad_2.rs
@@ -0,0 +1,17 @@
+fn foo() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+    let mut a;
+    let mut b=1;
+    let mut vec = Vec::new();
+    vec.push(1);
+    vec.push(2);
+
+
+    for x in 5..10 - 5 {
+        a = x;
+    }
+
+    }
diff --git a/tools/lint/test/files/codespell/ignore.rst b/tools/lint/test/files/codespell/ignore.rst
new file mode 100644
index 0000000000..1371d07054
--- /dev/null
+++ b/tools/lint/test/files/codespell/ignore.rst
@@ -0,0 +1,5 @@
+This is a file with some typos and informations.
+But also testing false positive like optin (because this isn't always option)
+or stuff related to our coding style like:
+aparent (aParent).
+but detects mistakes like mozila
diff --git a/tools/lint/test/files/eslint/good.js b/tools/lint/test/files/eslint/good.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/tools/lint/test/files/eslint/good.js
diff --git a/tools/lint/test/files/eslint/import/bad_import.js b/tools/lint/test/files/eslint/import/bad_import.js
new file mode 100644
index 0000000000..e2a8ec8de1
--- /dev/null
+++ b/tools/lint/test/files/eslint/import/bad_import.js
@@ -0,0 +1 @@
+/* import-globals-from notpresent/notpresent.js */
diff --git a/tools/lint/test/files/eslint/nolint/foo.txt b/tools/lint/test/files/eslint/nolint/foo.txt
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/tools/lint/test/files/eslint/nolint/foo.txt
diff --git a/tools/lint/test/files/eslint/subdir/bad.js b/tools/lint/test/files/eslint/subdir/bad.js
new file mode 100644
index 0000000000..9d2dd18f39
--- /dev/null
+++ b/tools/lint/test/files/eslint/subdir/bad.js
@@ -0,0 +1,2 @@
+// Missing semicolon
+let foo = "bar"
diff --git a/tools/lint/test/files/file-perm/maybe-shebang/bad.js b/tools/lint/test/files/file-perm/maybe-shebang/bad.js
new file mode 100755
index 0000000000..1a0b4c5fd6
--- /dev/null
+++ b/tools/lint/test/files/file-perm/maybe-shebang/bad.js
@@ -0,0 +1,2 @@
+# Nothing too
+
diff --git a/tools/lint/test/files/file-perm/maybe-shebang/good.js b/tools/lint/test/files/file-perm/maybe-shebang/good.js
new file mode 100755
index 0000000000..8149c0d4f3
--- /dev/null
+++ b/tools/lint/test/files/file-perm/maybe-shebang/good.js
@@ -0,0 +1,5 @@
+#!/usr/bin/env node
+
+
+# Nothing
+
diff --git a/tools/lint/test/files/file-perm/no-shebang/bad-shebang.c b/tools/lint/test/files/file-perm/no-shebang/bad-shebang.c
new file mode 100755
index 0000000000..7151678efa
--- /dev/null
+++ b/tools/lint/test/files/file-perm/no-shebang/bad-shebang.c
@@ -0,0 +1,2 @@
+#!/bin/bash
+int main() { return 0; }
diff --git a/tools/lint/test/files/file-perm/no-shebang/bad.c b/tools/lint/test/files/file-perm/no-shebang/bad.c
new file mode 100755
index 0000000000..76e8197013
--- /dev/null
+++ b/tools/lint/test/files/file-perm/no-shebang/bad.c
@@ -0,0 +1 @@
+int main() { return 0; }
diff --git a/tools/lint/test/files/file-perm/no-shebang/bad.png b/tools/lint/test/files/file-perm/no-shebang/bad.png
new file mode 100755
index 0000000000..db3a5fda7e
--- /dev/null
+++ b/tools/lint/test/files/file-perm/no-shebang/bad.png
diff --git a/tools/lint/test/files/file-perm/no-shebang/good.c b/tools/lint/test/files/file-perm/no-shebang/good.c
new file mode 100644
index 0000000000..76e8197013
--- /dev/null
+++ b/tools/lint/test/files/file-perm/no-shebang/good.c
@@ -0,0 +1 @@
+int main() { return 0; }
diff --git a/tools/lint/test/files/file-whitespace/bad-newline.c b/tools/lint/test/files/file-whitespace/bad-newline.c
new file mode 100644
index 0000000000..3746a0add3
--- /dev/null
+++ b/tools/lint/test/files/file-whitespace/bad-newline.c
@@ -0,0 +1,3 @@
+int main() { return 0; }
+
+  
\ No newline at end of file
diff --git a/tools/lint/test/files/file-whitespace/bad-windows.c b/tools/lint/test/files/file-whitespace/bad-windows.c
new file mode 100644
index 0000000000..70d4c697b9
--- /dev/null
+++ b/tools/lint/test/files/file-whitespace/bad-windows.c
@@ -0,0 +1,3 @@
+int main(){

+	return 42;

+}

diff --git a/tools/lint/test/files/file-whitespace/bad.c b/tools/lint/test/files/file-whitespace/bad.c
new file mode 100644
index 0000000000..4309b1f55d
--- /dev/null
+++ b/tools/lint/test/files/file-whitespace/bad.c
@@ -0,0 +1,3 @@
+int main() { 
+return 0; 
+}
diff --git a/tools/lint/test/files/file-whitespace/bad.js b/tools/lint/test/files/file-whitespace/bad.js
new file mode 100755
index 0000000000..3441696ef1
--- /dev/null
+++ b/tools/lint/test/files/file-whitespace/bad.js
@@ -0,0 +1,3 @@
+# Nothing too 
+
+
diff --git a/tools/lint/test/files/file-whitespace/good.c b/tools/lint/test/files/file-whitespace/good.c
new file mode 100644
index 0000000000..76e8197013
--- /dev/null
+++ b/tools/lint/test/files/file-whitespace/good.c
@@ -0,0 +1 @@
+int main() { return 0; }
diff --git a/tools/lint/test/files/file-whitespace/good.js b/tools/lint/test/files/file-whitespace/good.js
new file mode 100755
index 0000000000..8149c0d4f3
--- /dev/null
+++ b/tools/lint/test/files/file-whitespace/good.js
@@ -0,0 +1,5 @@
+#!/usr/bin/env node
+
+
+# Nothing
+
diff --git a/tools/lint/test/files/flake8/.flake8 b/tools/lint/test/files/flake8/.flake8
new file mode 100644
index 0000000000..1933432319
--- /dev/null
+++ b/tools/lint/test/files/flake8/.flake8
@@ -0,0 +1,4 @@
+[flake8]
+max-line-length = 100
+exclude =
+    subdir/exclude,
diff --git a/tools/lint/test/files/flake8/bad.py b/tools/lint/test/files/flake8/bad.py
new file mode 100644
index 0000000000..9d9751c7eb
--- /dev/null
+++ b/tools/lint/test/files/flake8/bad.py
@@ -0,0 +1,5 @@
+# Unused import
+import distutils
+
+print("This is a line that is over 80 characters but under 100. It shouldn't fail.")
+print("This is a line that is over not only 80, but 100 characters. It should most certainly cause a failure.")
diff --git a/tools/lint/test/files/flake8/custom/.flake8 b/tools/lint/test/files/flake8/custom/.flake8
new file mode 100644
index 0000000000..cfe68833f2
--- /dev/null
+++ b/tools/lint/test/files/flake8/custom/.flake8
@@ -0,0 +1,4 @@
+[flake8]
+max-line-length=110
+ignore=
+    F401
diff --git a/tools/lint/test/files/flake8/custom/good.py b/tools/lint/test/files/flake8/custom/good.py
new file mode 100644
index 0000000000..7f9121a2ba
--- /dev/null
+++ b/tools/lint/test/files/flake8/custom/good.py
@@ -0,0 +1,5 @@
+# Unused import
+import distutils
+
+print("This is a line that is over 80 characters but under 100. It shouldn't fail.")
+print("This is a line that is over not only 80, but 100 characters. It should also not cause a failure.")
diff --git a/tools/lint/test/files/flake8/ext/bad.configure b/tools/lint/test/files/flake8/ext/bad.configure
new file mode 100644
index 0000000000..8214ebb3c0
--- /dev/null
+++ b/tools/lint/test/files/flake8/ext/bad.configure
@@ -0,0 +1,2 @@
+# unused import
+import os
diff --git a/tools/lint/test/files/flake8/subdir/exclude/bad.py b/tools/lint/test/files/flake8/subdir/exclude/bad.py
new file mode 100644
index 0000000000..9d9751c7eb
--- /dev/null
+++ b/tools/lint/test/files/flake8/subdir/exclude/bad.py
@@ -0,0 +1,5 @@
+# Unused import
+import distutils
+
+print("This is a line that is over 80 characters but under 100. It shouldn't fail.")
+print("This is a line that is over not only 80, but 100 characters. It should most certainly cause a failure.")
diff --git a/tools/lint/test/files/flake8/subdir/exclude/exclude_subdir/bad.py b/tools/lint/test/files/flake8/subdir/exclude/exclude_subdir/bad.py
new file mode 100644
index 0000000000..9d9751c7eb
--- /dev/null
+++ b/tools/lint/test/files/flake8/subdir/exclude/exclude_subdir/bad.py
@@ -0,0 +1,5 @@
+# Unused import
+import distutils
+
+print("This is a line that is over 80 characters but under 100. It shouldn't fail.")
+print("This is a line that is over not only 80, but 100 characters. It should most certainly cause a failure.")
diff --git a/tools/lint/test/files/license/.eslintrc.js b/tools/lint/test/files/license/.eslintrc.js
new file mode 100644
index 0000000000..0449fdfa33
--- /dev/null
+++ b/tools/lint/test/files/license/.eslintrc.js
@@ -0,0 +1,5 @@
+
+// Dot file to verify that it works
+// without license
+
+"use strict";
diff --git a/tools/lint/test/files/license/bad.c b/tools/lint/test/files/license/bad.c
new file mode 100644
index 0000000000..76e8197013
--- /dev/null
+++ b/tools/lint/test/files/license/bad.c
@@ -0,0 +1 @@
+int main() { return 0; }
diff --git a/tools/lint/test/files/license/bad.js b/tools/lint/test/files/license/bad.js
new file mode 100644
index 0000000000..5de1a72f1f
--- /dev/null
+++ b/tools/lint/test/files/license/bad.js
@@ -0,0 +1,6 @@
+/*
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Pulic Unknown License as published by
+ * the Free Software Foundation, version 3.
+ *
+ */
diff --git a/tools/lint/test/files/license/good-other.h b/tools/lint/test/files/license/good-other.h
new file mode 100644
index 0000000000..fb915e9b26
--- /dev/null
+++ b/tools/lint/test/files/license/good-other.h
@@ -0,0 +1,9 @@
+/*
+Permission to use, copy, modify, distribute and sell this software
+and its documentation for any purpose is hereby granted without fee,
+provided that the above copyright notice appear in all copies and
+that both that copyright notice and this permission notice appear
+in supporting documentation.  Samphan Raruenrom makes no
+representations about the suitability of this software for any
+purpose.  It is provided "as is" without express or implied warranty.
+*/
diff --git a/tools/lint/test/files/license/good.c b/tools/lint/test/files/license/good.c
new file mode 100644
index 0000000000..d1a6827fb1
--- /dev/null
+++ b/tools/lint/test/files/license/good.c
@@ -0,0 +1,8 @@
+
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+int main() { return 0; }
diff --git a/tools/lint/test/files/license/good.js b/tools/lint/test/files/license/good.js
new file mode 100644
index 0000000000..d10ae3a8d5
--- /dev/null
+++ b/tools/lint/test/files/license/good.js
@@ -0,0 +1,7 @@
+#!/usr/bin/env node
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+# Nothing
+
diff --git a/tools/lint/test/files/lintpref/bad.js b/tools/lint/test/files/lintpref/bad.js
new file mode 100644
index 0000000000..ab55ba5dad
--- /dev/null
+++ b/tools/lint/test/files/lintpref/bad.js
@@ -0,0 +1,2 @@
+// Real test pref, matching value.
+pref("dom.webidl.test1", true);
diff --git a/tools/lint/test/files/lintpref/good.js b/tools/lint/test/files/lintpref/good.js
new file mode 100644
index 0000000000..0bf81c8f58
--- /dev/null
+++ b/tools/lint/test/files/lintpref/good.js
@@ -0,0 +1,6 @@
+// Fake prefs.
+pref("foo.bar", 1);
+pref("foo.baz", "1.234");
+
+// Real test pref, different value.
+pref("dom.webidl.test1", false);
diff --git a/tools/lint/test/files/pylint/bad.py b/tools/lint/test/files/pylint/bad.py
new file mode 100644
index 0000000000..61b69a49cf
--- /dev/null
+++ b/tools/lint/test/files/pylint/bad.py
@@ -0,0 +1,5 @@
+def foo():
+    useless_var = 1
+    useless_var = true
+    return "true"
+    print("unreachable")
\ No newline at end of file
diff --git a/tools/lint/test/files/pylint/good.py b/tools/lint/test/files/pylint/good.py
new file mode 100644
index 0000000000..c867dc66ec
--- /dev/null
+++ b/tools/lint/test/files/pylint/good.py
@@ -0,0 +1,3 @@
+def foo():
+    a = 1 + 1
+    return a
diff --git a/tools/lint/test/files/rst/.dotfile.rst b/tools/lint/test/files/rst/.dotfile.rst
new file mode 100644
index 0000000000..be24e1d161
--- /dev/null
+++ b/tools/lint/test/files/rst/.dotfile.rst
@@ -0,0 +1,11 @@
+============
+Coding style
+==========
+
+foo bar 
+~~~~~
+
+
+This file has error but should not be there
+as we don't analyze dot files
+
diff --git a/tools/lint/test/files/rst/bad.rst b/tools/lint/test/files/rst/bad.rst
new file mode 100644
index 0000000000..c9b60f613e
--- /dev/null
+++ b/tools/lint/test/files/rst/bad.rst
@@ -0,0 +1,20 @@
+============
+Coding style
+============
+
+
+This document attempts to explain the basic styles and patterns used in
+the Mozilla codebase. New code should try to conform to these standards,
+so it is as easy to maintain as existing code. There are exceptions, but
+it's still important to know the rules!
+
+
+Whitespace
+~~~~~~~~
+
+Line length
+~~~~~~~~~~~
+
+Line length
+~~~~~~~~~~~
+
diff --git a/tools/lint/test/files/rst/bad2.rst b/tools/lint/test/files/rst/bad2.rst
new file mode 100644
index 0000000000..81c35dde06
--- /dev/null
+++ b/tools/lint/test/files/rst/bad2.rst
@@ -0,0 +1,4 @@
+====
+Test
+===
+
diff --git a/tools/lint/test/files/rst/good.rst b/tools/lint/test/files/rst/good.rst
new file mode 100644
index 0000000000..fd12da85d3
--- /dev/null
+++ b/tools/lint/test/files/rst/good.rst
@@ -0,0 +1,11 @@
+============
+Coding style
+============
+
+
+This document attempts to explain the basic styles and patterns used in
+the Mozilla codebase. New code should try to conform to these standards,
+so it is as easy to maintain as existing code. There are exceptions, but
+it's still important to know the rules!
+
+
diff --git a/tools/lint/test/files/rustfmt/subdir/bad.rs b/tools/lint/test/files/rustfmt/subdir/bad.rs
new file mode 100644
index 0000000000..fb1746fafd
--- /dev/null
+++ b/tools/lint/test/files/rustfmt/subdir/bad.rs
@@ -0,0 +1,16 @@
+fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+    // Clippy detects this as a swap and considers this as an error
+    let mut a =
+        1;
+    let mut b=1;
+
+    a =
+        b;
+    b = a;
+
+
+}
diff --git a/tools/lint/test/files/rustfmt/subdir/bad2.rs b/tools/lint/test/files/rustfmt/subdir/bad2.rs
new file mode 100644
index 0000000000..a4236a2de7
--- /dev/null
+++ b/tools/lint/test/files/rustfmt/subdir/bad2.rs
@@ -0,0 +1,17 @@
+fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+    let mut a;
+    let mut b=1;
+    let mut vec = Vec::new();
+    vec.push(1);
+    vec.push(2);
+
+
+    for x in 5..10 - 5 {
+        a = x;
+    }
+
+    }
diff --git a/tools/lint/test/files/rustfmt/subdir/good.rs b/tools/lint/test/files/rustfmt/subdir/good.rs
new file mode 100644
index 0000000000..9bcaee67b7
--- /dev/null
+++ b/tools/lint/test/files/rustfmt/subdir/good.rs
@@ -0,0 +1,6 @@
+fn main() {
+    // Statements here are executed when the compiled binary is called
+
+    // Print text to the console
+    println!("Hello World!");
+}
diff --git a/tools/lint/test/files/shellcheck/bad.sh b/tools/lint/test/files/shellcheck/bad.sh
new file mode 100644
index 0000000000..b2eb195558
--- /dev/null
+++ b/tools/lint/test/files/shellcheck/bad.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+hello="Hello world"
+echo $1
diff --git a/tools/lint/test/files/shellcheck/good.sh b/tools/lint/test/files/shellcheck/good.sh
new file mode 100644
index 0000000000..e61d501955
--- /dev/null
+++ b/tools/lint/test/files/shellcheck/good.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+echo "Hello world"
diff --git a/tools/lint/test/files/yaml/.yamllint b/tools/lint/test/files/yaml/.yamllint
new file mode 100644
index 0000000000..4f11bbd6c5
--- /dev/null
+++ b/tools/lint/test/files/yaml/.yamllint
@@ -0,0 +1,6 @@
+# Any copyright is dedicated to the Public Domain.
+# http://creativecommons.org/publicdomain/zero/1.0/
+
+# Explicity default .yamllint to isolate tests from tree-wide yamlint config.
+---
+extends: default
diff --git a/tools/lint/test/files/yaml/bad.yml b/tools/lint/test/files/yaml/bad.yml
new file mode 100644
index 0000000000..195ac7b030
--- /dev/null
+++ b/tools/lint/test/files/yaml/bad.yml
@@ -0,0 +1,8 @@
+---
+yamllint:
+  description: YAML linteraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaax
+  include:
+        - .cron.yml
+        - browser/config/
+        - wrong
+  application:bar
diff --git a/tools/lint/test/files/yaml/good.yml b/tools/lint/test/files/yaml/good.yml
new file mode 100644
index 0000000000..b30941b797
--- /dev/null
+++ b/tools/lint/test/files/yaml/good.yml
@@ -0,0 +1,6 @@
+---
+yamllint:
+    description: YAML linter
+    include:
+        - .cron.yml
+        - browser/config/
diff --git a/tools/lint/test/python.ini b/tools/lint/test/python.ini
new file mode 100644
index 0000000000..5acd0a1e81
--- /dev/null
+++ b/tools/lint/test/python.ini
@@ -0,0 +1,34 @@
+[DEFAULT]
+subsuite = mozlint
+skip-if = python == 2
+
+[test_black.py]
+requirements = tools/lint/python/black_requirements.txt
+skip-if = os == "mac"  # pip unable to find black
+[test_eslint.py]
+[test_flake8.py]
+requirements = tools/lint/python/flake8_requirements.txt
+skip-if = os == "mac"  # pip unable to find 'flake8==3.5.0'
+[test_file_perm.py]
+skip-if = os == "win"
+[test_file_whitespace.py]
+[test_file_license.py]
+[test_lintpref.py]
+[test_shellcheck.py]
+[test_rst.py]
+requirements = tools/lint/rst/requirements.txt
+skip-if = os == "mac" # pip unable to install
+[test_codespell.py]
+skip-if = os == "win" || os == "mac"  # codespell installed on Linux
+[test_yaml.py]
+[test_clippy.py]
+skip-if = os == "win" || os == "mac"  # only installed on Linux
+[test_rustfmt.py]
+skip-if = os == "win" || os == "mac"  # only installed on Linux
+[test_clang_format.py]
+skip-if = os == "win" || os == "mac"  # only installed on Linux
+[test_perfdocs.py]
+[test_pylint.py]
+skip-if = os == "win" || os == "mac"  # only installed on linux
+requirements = tools/lint/python/pylint_requirements.txt
+
diff --git a/tools/lint/test/test_black.py b/tools/lint/test/test_black.py
new file mode 100644
index 0000000000..a5482c6e11
--- /dev/null
+++ b/tools/lint/test/test_black.py
@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import mozunit
+
+LINTER = "black"
+
+
+def test_lint_black(lint, paths):
+    results = lint(paths())
+    assert len(results) == 2
+
+    print(results)
+    assert results[0].level == "error"
+    assert results[0].relpath == "bad.py"
+
+    assert "EOF" in results[1].message
+    assert results[1].level == "error"
+    assert results[1].relpath == "invalid.py"
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_clang_format.py b/tools/lint/test/test_clang_format.py
new file mode 100644
index 0000000000..a04fde6267
--- /dev/null
+++ b/tools/lint/test/test_clang_format.py
@@ -0,0 +1,48 @@
+import mozunit
+
+from conftest import build
+
+LINTER = "clang-format"
+
+
+def test_good(lint, config, paths):
+    results = lint(paths("good/"), root=build.topsrcdir, use_filters=False)
+    print(results)
+    assert len(results) == 0
+
+
+def test_basic(lint, config, paths):
+    results = lint(paths("bad/bad.cpp"), root=build.topsrcdir, use_filters=False)
+    print(results)
+    assert len(results) >= 1
+
+    assert "Reformat C/C++" in results[0].message
+    assert results[0].level == "warning"
+    assert results[0].lineno == 1
+    assert results[0].column == 4
+    assert "bad.cpp" in results[0].path
+    assert "int  main ( ) {" in results[0].diff
+
+
+def test_dir(lint, config, paths):
+    results = lint(paths("bad/"), root=build.topsrcdir, use_filters=False)
+    print(results)
+    assert len(results) >= 4
+
+    assert "Reformat C/C++" in results[0].message
+    assert results[0].level == "warning"
+    assert results[0].lineno == 1
+    assert results[0].column == 4
+    assert "bad.cpp" in results[0].path
+    assert "int  main ( ) {" in results[0].diff
+
+    assert "Reformat C/C++" in results[5].message
+    assert results[5].level == "warning"
+    assert results[5].lineno == 1
+    assert results[5].column == 18
+    assert "bad2.c" in results[5].path
+    assert "#include" in results[5].diff
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_clippy.py b/tools/lint/test/test_clippy.py
new file mode 100644
index 0000000000..553aba8876
--- /dev/null
+++ b/tools/lint/test/test_clippy.py
@@ -0,0 +1,103 @@
+import mozunit
+import os
+
+LINTER = "clippy"
+
+
+def test_basic(lint, config, paths):
+    results = lint(paths("test1/"))
+    print(results)
+    assert len(results) > 7
+
+    assert (
+        "is never read" in results[0].message or "but never used" in results[0].message
+    )
+    assert results[0].level == "warning"
+    assert results[0].lineno == 7
+    assert results[0].column == 9
+    assert results[0].rule == "unused_assignments"
+    assert results[0].relpath == "test1/bad.rs"
+    assert "tools/lint/test/files/clippy/test1/bad.rs" in results[0].path
+
+    assert "this looks like you are trying to swap `a` and `b`" in results[1].message
+    assert results[1].level == "error"
+    assert results[1].relpath == "test1/bad.rs"
+    assert results[1].rule == "clippy::almost_swapped"
+    assert "or maybe you should use `std::mem::replace`" in results[1].hint
+
+    assert "value assigned to `b` is never read" in results[2].message
+    assert results[2].level == "warning"
+    assert results[2].relpath == "test1/bad.rs"
+
+    assert "variable does not need to be mutable" in results[5].message
+    assert results[5].relpath == "test1/bad2.rs"
+    assert results[5].rule == "unused_mut"
+
+    assert "this range is empty so" in results[6].message
+    assert results[6].level == "error"
+    assert results[6].relpath == "test1/bad2.rs"
+    assert results[6].rule == "clippy::reversed_empty_ranges"
+
+
+def test_error(lint, config, paths):
+    results = lint(paths("test1/Cargo.toml"))
+    # Should fail. We don't accept Cargo.toml as input
+    assert results == 1
+
+
+def test_file_and_path_provided(lint, config, paths):
+    results = lint(paths("./test2/src/bad_1.rs", "test1/"))
+    # even if clippy analyzed it
+    # we should not have anything from bad_2.rs
+    # as mozlint is filtering out the file
+    print(results)
+    assert len(results) > 16
+    assert "value assigned to `a` is never read" in results[0].message
+    assert results[0].level == "warning"
+    assert results[0].lineno == 7
+    assert results[0].column == 9
+    assert results[0].rule == "unused_assignments"
+    assert results[0].relpath == "test1/bad.rs"
+    assert "tools/lint/test/files/clippy/test1/bad.rs" in results[0].path
+    assert "value assigned to `a` is never read" in results[0].message
+    assert results[8].level == "warning"
+    assert results[8].lineno == 1
+    assert results[8].column == 4
+    assert results[8].rule == "dead_code"
+    assert results[8].relpath == "test2/src/bad_1.rs"
+    assert "tools/lint/test/files/clippy/test2/src/bad_1.rs" in results[8].path
+    for r in results:
+        assert "bad_2.rs" not in r.relpath
+
+
+def test_file_provided(lint, config, paths):
+    results = lint(paths("./test2/src/bad_1.rs"))
+    # even if clippy analyzed it
+    # we should not have anything from bad_2.rs
+    # as mozlint is filtering out the file
+    print(results)
+    assert len(results) > 8
+    assert results[0].level == "warning"
+    assert results[0].lineno == 1
+    assert results[0].column == 4
+    assert results[0].rule == "dead_code"
+    assert results[0].relpath == "test2/src/bad_1.rs"
+    assert "tools/lint/test/files/clippy/test2/src/bad_1.rs" in results[0].path
+    for r in results:
+        assert "bad_2.rs" not in r.relpath
+
+
+def test_cleanup(lint, paths, root):
+    # If Cargo.lock does not exist before clippy run, delete it
+    lint(paths("test1/"))
+    assert not os.path.exists(os.path.join(root, "test1/target/"))
+    assert not os.path.exists(os.path.join(root, "test1/Cargo.lock"))
+
+    # If Cargo.lock exists before clippy run, keep it after cleanup
+    lint(paths("test2/"))
+    assert not os.path.exists(os.path.join(root, "test2/target/"))
+    assert os.path.exists(os.path.join(root, "test2/Cargo.lock"))
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_codespell.py b/tools/lint/test/test_codespell.py
new file mode 100644
index 0000000000..41912e01a7
--- /dev/null
+++ b/tools/lint/test/test_codespell.py
@@ -0,0 +1,24 @@
+from __future__ import absolute_import, print_function
+
+import mozunit
+
+LINTER = "codespell"
+
+
+def test_lint_codespell(lint, paths):
+    results = lint(paths())
+    assert len(results) == 2
+
+    assert results[0].message == "informations ==> information"
+    assert results[0].level == "error"
+    assert results[0].lineno == 1
+    assert results[0].relpath == "ignore.rst"
+
+    assert results[1].message == "mozila ==> mozilla"
+    assert results[1].level == "error"
+    assert results[1].lineno == 5
+    assert results[1].relpath == "ignore.rst"
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_eslint.py b/tools/lint/test/test_eslint.py
new file mode 100644
index 0000000000..01456a4063
--- /dev/null
+++ b/tools/lint/test/test_eslint.py
@@ -0,0 +1,30 @@
+import mozunit
+
+from conftest import build
+
+LINTER = "eslint"
+
+
+def test_lint_with_global_exclude(lint, config, paths):
+    config["exclude"] = ["subdir", "import"]
+    results = lint(paths(), config=config, root=build.topsrcdir)
+    assert len(results) == 0
+
+
+def test_no_files_to_lint(lint, config, paths):
+    # A directory with no files to lint.
+    results = lint(paths("nolint"), root=build.topsrcdir)
+    assert results == []
+
+    # Errors still show up even when a directory with no files is passed in.
+    results = lint(paths("nolint", "subdir/bad.js"), root=build.topsrcdir)
+    assert len(results) == 1
+
+
+def test_bad_import(lint, config, paths):
+    results = lint(paths("import"), config=config, root=build.topsrcdir)
+    assert results == 1
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_file_license.py b/tools/lint/test/test_file_license.py
new file mode 100644
index 0000000000..b7f0efac60
--- /dev/null
+++ b/tools/lint/test/test_file_license.py
@@ -0,0 +1,25 @@
+from __future__ import absolute_import, print_function
+
+import mozunit
+
+LINTER = "license"
+
+
+def test_lint_license(lint, paths):
+    results = lint(paths())
+    print(results)
+    assert len(results) == 3
+
+    assert ".eslintrc.js" in results[0].relpath
+
+    assert "No matching license strings" in results[1].message
+    assert results[1].level == "error"
+    assert "bad.c" in results[1].relpath
+
+    assert "No matching license strings" in results[2].message
+    assert results[2].level == "error"
+    assert "bad.js" in results[2].relpath
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_file_perm.py b/tools/lint/test/test_file_perm.py
new file mode 100644
index 0000000000..df5de9adb8
--- /dev/null
+++ b/tools/lint/test/test_file_perm.py
@@ -0,0 +1,39 @@
+from __future__ import absolute_import, print_function
+
+import pytest
+
+import mozunit
+
+LINTER = "file-perm"
+
+
+@pytest.mark.lint_config(name="file-perm")
+def test_lint_file_perm(lint, paths):
+    results = lint(paths("no-shebang"), collapse_results=True)
+    print(results)
+
+    assert results.keys() == {
+        "no-shebang/bad.c",
+        "no-shebang/bad-shebang.c",
+        "no-shebang/bad.png",
+    }
+
+    for path, issues in results.items():
+        for issue in issues:
+            assert "permissions on a source" in issue.message
+            assert issue.level == "error"
+
+
+@pytest.mark.lint_config(name="maybe-shebang-file-perm")
+def test_lint_shebang_file_perm(config, lint, paths):
+    results = lint(paths("maybe-shebang"))
+    print(results)
+    assert len(results) == 1
+
+    assert "permissions on a source" in results[0].message
+    assert results[0].level == "error"
+    assert results[0].relpath == "maybe-shebang/bad.js"
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_file_whitespace.py b/tools/lint/test/test_file_whitespace.py
new file mode 100644
index 0000000000..b6fa79799b
--- /dev/null
+++ b/tools/lint/test/test_file_whitespace.py
@@ -0,0 +1,37 @@
+from __future__ import absolute_import, print_function
+
+import mozunit
+
+LINTER = "file-whitespace"
+
+
+def test_lint_file_whitespace(lint, paths):
+    results = lint(paths())
+    print(results)
+    assert len(results) == 5
+
+    assert "File does not end with newline character" in results[1].message
+    assert results[1].level == "error"
+    assert "bad-newline.c" in results[1].relpath
+
+    assert "Empty Lines at end of file" in results[0].message
+    assert results[0].level == "error"
+    assert "bad-newline.c" in results[0].relpath
+
+    assert "Windows line return" in results[2].message
+    assert results[2].level == "error"
+    assert "bad-windows.c" in results[2].relpath
+
+    assert "Trailing whitespace" in results[3].message
+    assert results[3].level == "error"
+    assert "bad.c" in results[3].relpath
+    assert results[3].lineno == 1
+
+    assert "Trailing whitespace" in results[4].message
+    assert results[4].level == "error"
+    assert "bad.c" in results[4].relpath
+    assert results[4].lineno == 2
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_flake8.py b/tools/lint/test/test_flake8.py
new file mode 100644
index 0000000000..66befab4e7
--- /dev/null
+++ b/tools/lint/test/test_flake8.py
@@ -0,0 +1,109 @@
+import os
+
+import mozunit
+
+LINTER = "flake8"
+
+
+def test_lint_single_file(lint, paths):
+    results = lint(paths("bad.py"))
+    assert len(results) == 2
+    assert results[0].rule == "F401"
+    assert results[1].rule == "E501"
+    assert results[1].lineno == 5
+
+    # run lint again to make sure the previous results aren't counted twice
+    results = lint(paths("bad.py"))
+    assert len(results) == 2
+
+
+def test_lint_custom_config_ignored(lint, paths):
+    results = lint(paths("custom"))
+    assert len(results) == 2
+
+    results = lint(paths("custom/good.py"))
+    assert len(results) == 2
+
+
+def test_lint_fix(lint, create_temp_file):
+    contents = """
+import distutils
+
+def foobar():
+    pass
+""".lstrip()
+
+    path = create_temp_file(contents, name="bad.py")
+    results = lint([path])
+    assert len(results) == 2
+
+    # Make sure the missing blank line is fixed, but the unused import isn't.
+    results = lint([path], fix=True)
+    assert len(results) == 1
+
+    # Also test with a directory
+    path = os.path.dirname(create_temp_file(contents, name="bad2.py"))
+    results = lint([path], fix=True)
+    # There should now be two files with 2 combined errors
+    assert len(results) == 2
+    assert all(r.rule != "E501" for r in results)
+
+
+def test_lint_fix_uses_config(lint, create_temp_file):
+    contents = """
+foo = ['A list of strings', 'that go over 80 characters', 'to test if autopep8 fixes it']
+""".lstrip()
+
+    path = create_temp_file(contents, name="line_length.py")
+    lint([path], fix=True)
+
+    # Make sure autopep8 reads the global config under lintargs['root']. If it
+    # didn't, then the line-length over 80 would get fixed.
+    with open(path, "r") as fh:
+        assert fh.read() == contents
+
+
+def test_lint_excluded_file(lint, paths, config):
+    # First file is globally excluded, second one is from .flake8 config.
+    files = paths("bad.py", "subdir/exclude/bad.py", "subdir/exclude/exclude_subdir")
+    config["exclude"] = paths("bad.py")
+    results = lint(files, config)
+    print(results)
+    assert len(results) == 0
+
+    # Make sure excludes also apply when running from a different cwd.
+    cwd = paths("subdir")[0]
+    os.chdir(cwd)
+
+    results = lint(paths("subdir/exclude"))
+    print(results)
+    assert len(results) == 0
+
+
+def test_lint_excluded_file_with_glob(lint, paths, config):
+    config["exclude"] = paths("ext/*.configure")
+
+    files = paths("ext")
+    results = lint(files, config)
+    print(results)
+    assert len(results) == 0
+
+    files = paths("ext/bad.configure")
+    results = lint(files, config)
+    print(results)
+    assert len(results) == 0
+
+
+def test_lint_excluded_file_with_no_filter(lint, paths, config):
+    results = lint(paths("subdir/exclude"), use_filters=False)
+    print(results)
+    assert len(results) == 4
+
+
+def test_lint_uses_custom_extensions(lint, paths):
+    assert len(lint(paths("ext"))) == 1
+    assert len(lint(paths("ext/bad.configure"))) == 1
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_lintpref.py b/tools/lint/test/test_lintpref.py
new file mode 100644
index 0000000000..4fb3b8d23c
--- /dev/null
+++ b/tools/lint/test/test_lintpref.py
@@ -0,0 +1,18 @@
+from __future__ import absolute_import, print_function
+
+import mozunit
+
+LINTER = "lintpref"
+
+
+def test_lintpref(lint, paths):
+    results = lint(paths())
+    assert len(results) == 1
+    assert results[0].level == "error"
+    assert 'pref("dom.webidl.test1", true);' in results[0].message
+    assert "bad.js" in results[0].relpath
+    assert results[0].lineno == 2
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_perfdocs.py b/tools/lint/test/test_perfdocs.py
new file mode 100644
index 0000000000..f977330fda
--- /dev/null
+++ b/tools/lint/test/test_perfdocs.py
@@ -0,0 +1,423 @@
+import contextlib
+import mock
+import os
+import pytest
+import shutil
+import tempfile
+
+import mozunit
+
+LINTER = "perfdocs"
+
+
+class PerfDocsLoggerMock:
+    LOGGER = None
+    PATHS = []
+    FAILED = True
+
+
+"""
+This is a sample mozperftest test that we use for testing
+the verification process.
+"""
+SAMPLE_TEST = """
+"use strict";
+
+async function setUp(context) {
+  context.log.info("setUp example!");
+}
+
+async function test(context, commands) {
+  context.log.info("Test with setUp/tearDown example!");
+  await commands.measure.start("https://www.sitespeed.io/");
+  await commands.measure.start("https://www.mozilla.org/en-US/");
+}
+
+async function tearDown(context) {
+  context.log.info("tearDown example!");
+}
+
+module.noexport = {};
+
+module.exports = {
+  setUp,
+  tearDown,
+  test,
+  owner: "Performance Testing Team",
+  name: "Example",
+  description: "The description of the example test.",
+  longDescription: `
+  This is a longer description of the test perhaps including information
+  about how it should be run locally or links to relevant information.
+  `
+};
+"""
+
+
+SAMPLE_CONFIG = """
+name: mozperftest
+manifest: None
+static-only: False
+suites:
+    suite:
+        description: "Performance tests from the 'suite' folder."
+        tests:
+            Example: ""
+"""
+
+
+DYNAMIC_SAMPLE_CONFIG = """
+name: {}
+manifest: None
+static-only: False
+suites:
+    suite:
+        description: "Performance tests from the 'suite' folder."
+        tests:
+            Example: ""
+"""
+
+
+@contextlib.contextmanager
+def temp_file(name="temp", tempdir=None, content=None):
+    if tempdir is None:
+        tempdir = tempfile.mkdtemp()
+    path = os.path.join(tempdir, name)
+    if content is not None:
+        with open(path, "w") as f:
+            f.write(content)
+    try:
+        yield path
+    finally:
+        try:
+            shutil.rmtree(tempdir)
+        except FileNotFoundError:
+            pass
+
+
+@contextlib.contextmanager
+def temp_dir():
+    tempdir = tempfile.mkdtemp()
+    try:
+        yield tempdir
+    finally:
+        try:
+            shutil.rmtree(tempdir)
+        except FileNotFoundError:
+            pass
+
+
+def setup_sample_logger(logger, structured_logger, top_dir):
+    from perfdocs.logger import PerfDocLogger
+
+    PerfDocLogger.LOGGER = structured_logger
+    PerfDocLogger.PATHS = ["perfdocs"]
+    PerfDocLogger.TOP_DIR = top_dir
+
+    import perfdocs.verifier as vf
+    import perfdocs.gatherer as gt
+    import perfdocs.generator as gn
+
+    gt.logger = logger
+    vf.logger = logger
+    gn.logger = logger
+
+
+@mock.patch("perfdocs.generator.Generator")
+@mock.patch("perfdocs.verifier.Verifier")
+@mock.patch("perfdocs.logger.PerfDocLogger", new=PerfDocsLoggerMock)
+def test_perfdocs_start_and_fail(verifier, generator, structured_logger, config, paths):
+    from perfdocs.perfdocs import run_perfdocs
+
+    with temp_file("bad", content="foo") as temp:
+        run_perfdocs(config, logger=structured_logger, paths=[temp], generate=False)
+        assert PerfDocsLoggerMock.LOGGER == structured_logger
+        assert PerfDocsLoggerMock.PATHS == [temp]
+        assert PerfDocsLoggerMock.FAILED
+
+    assert verifier.call_count == 1
+    assert mock.call().validate_tree() in verifier.mock_calls
+    assert generator.call_count == 0
+
+
+@mock.patch("perfdocs.generator.Generator")
+@mock.patch("perfdocs.verifier.Verifier")
+@mock.patch("perfdocs.logger.PerfDocLogger", new=PerfDocsLoggerMock)
+def test_perfdocs_start_and_pass(verifier, generator, structured_logger, config, paths):
+    from perfdocs.perfdocs import run_perfdocs
+
+    PerfDocsLoggerMock.FAILED = False
+    with temp_file("bad", content="foo") as temp:
+        run_perfdocs(config, logger=structured_logger, paths=[temp], generate=False)
+        assert PerfDocsLoggerMock.LOGGER == structured_logger
+        assert PerfDocsLoggerMock.PATHS == [temp]
+        assert not PerfDocsLoggerMock.FAILED
+
+    assert verifier.call_count == 1
+    assert mock.call().validate_tree() in verifier.mock_calls
+    assert generator.call_count == 1
+    assert mock.call().generate_perfdocs() in generator.mock_calls
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger", new=PerfDocsLoggerMock)
+def test_perfdocs_bad_paths(structured_logger, config, paths):
+    from perfdocs.perfdocs import run_perfdocs
+
+    with pytest.raises(Exception):
+        run_perfdocs(config, logger=structured_logger, paths=["bad"], generate=False)
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verification(logger, structured_logger, perfdocs_sample):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    verifier.validate_tree()
+
+    # Make sure that we had no warnings
+    assert logger.warning.call_count == 0
+    assert logger.log.call_count == 1
+    assert len(logger.mock_calls) == 1
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_validate_yaml_pass(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    yaml_path = perfdocs_sample["config"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    valid = Verifier(top_dir).validate_yaml(yaml_path)
+
+    assert valid
+
+
+@mock.patch("perfdocs.verifier.jsonschema")
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_invalid_yaml(
+    logger, jsonschema, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    yaml_path = perfdocs_sample["config"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    jsonschema.validate = mock.Mock(side_effect=Exception("Schema/ValidationError"))
+    verifier = Verifier("top_dir")
+    valid = verifier.validate_yaml(yaml_path)
+
+    expected = ("YAML ValidationError: Schema/ValidationError", yaml_path)
+    args, _ = logger.warning.call_args
+
+    assert logger.warning.call_count == 1
+    assert args == expected
+    assert not valid
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_validate_rst_pass(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    rst_path = perfdocs_sample["index"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    valid = Verifier(top_dir).validate_rst_content(rst_path)
+
+    assert valid
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_invalid_rst(logger, structured_logger, perfdocs_sample):
+    top_dir = perfdocs_sample["top_dir"]
+    rst_path = perfdocs_sample["index"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    # Replace the target string to invalid Keyword for test
+    with open(rst_path, "r") as file:
+        filedata = file.read()
+
+    filedata = filedata.replace("documentation", "Invalid Keyword")
+
+    with open(rst_path, "w") as file:
+        file.write(filedata)
+
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier("top_dir")
+    valid = verifier.validate_rst_content(rst_path)
+
+    expected = (
+        "Cannot find a '{documentation}' entry in the given index file",
+        rst_path,
+    )
+    args, _ = logger.warning.call_args
+
+    assert logger.warning.call_count == 1
+    assert args == expected
+    assert not valid
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_validate_descriptions_pass(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    verifier._check_framework_descriptions(verifier._gatherer.perfdocs_tree[0])
+
+    assert logger.warning.call_count == 0
+    assert logger.log.call_count == 1
+    assert len(logger.mock_calls) == 1
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_not_existing_suite_in_test_list(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    manifest_path = perfdocs_sample["manifest"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    os.remove(manifest_path)
+    verifier._check_framework_descriptions(verifier._gatherer.perfdocs_tree[0])
+
+    expected = (
+        "Could not find an existing suite for suite - bad suite name?",
+        perfdocs_sample["config"],
+    )
+    args, _ = logger.warning.call_args
+
+    assert logger.warning.call_count == 1
+    assert args == expected
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_not_existing_tests_in_suites(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    with open(perfdocs_sample["config"], "r") as file:
+        filedata = file.read()
+        filedata = filedata.replace("Example", "DifferentName")
+    with open(perfdocs_sample["config"], "w") as file:
+        file.write(filedata)
+
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier(top_dir)
+    verifier._check_framework_descriptions(verifier._gatherer.perfdocs_tree[0])
+
+    expected = [
+        "Could not find an existing test for DifferentName - bad test name?",
+        "Could not find a test description for Example",
+    ]
+
+    assert logger.warning.call_count == 2
+    for i, call in enumerate(logger.warning.call_args_list):
+        args, _ = call
+        assert args[0] == expected[i]
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_invalid_dir(logger, structured_logger, perfdocs_sample):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    verifier = Verifier("invalid_path")
+    with pytest.raises(Exception) as exceinfo:
+        verifier.validate_tree()
+
+    assert str(exceinfo.value) == "No valid perfdocs directories found"
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_verifier_file_invalidation(
+    logger, structured_logger, perfdocs_sample
+):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    from perfdocs.verifier import Verifier
+
+    Verifier.validate_yaml = mock.Mock(return_value=False)
+    verifier = Verifier(top_dir)
+    with pytest.raises(Exception):
+        verifier.validate_tree()
+
+    # Check if "File validation error" log is called
+    # and Called with a log inside perfdocs_tree().
+    assert logger.log.call_count == 2
+    assert len(logger.mock_calls) == 2
+
+
+@mock.patch("perfdocs.logger.PerfDocLogger")
+def test_perfdocs_framework_gatherers(logger, structured_logger, perfdocs_sample):
+    top_dir = perfdocs_sample["top_dir"]
+    setup_sample_logger(logger, structured_logger, top_dir)
+
+    # Check to make sure that every single framework
+    # gatherer that has been implemented produces a test list
+    # in every suite that contains a test with an associated
+    # manifest.
+    from perfdocs.gatherer import frameworks
+
+    for framework, gatherer in frameworks.items():
+        with open(perfdocs_sample["config"], "w") as f:
+            f.write(DYNAMIC_SAMPLE_CONFIG.format(framework))
+
+        fg = gatherer(perfdocs_sample["config"], top_dir)
+        if getattr(fg, "get_test_list", None) is None:
+            # Skip framework gatherers that have not
+            # implemented a method to build a test list.
+            continue
+
+        # Setup some framework-specific things here if needed
+        if framework == "raptor":
+            fg._manifest_path = perfdocs_sample["manifest"]
+            fg._get_subtests_from_ini = mock.Mock()
+            fg._get_subtests_from_ini.return_value = {
+                "Example": perfdocs_sample["manifest"]
+            }
+
+        for suite, suitetests in fg.get_test_list().items():
+            assert suite == "suite"
+            for test, manifest in suitetests.items():
+                assert test == "Example"
+                assert manifest == perfdocs_sample["manifest"]
+
+
+def test_perfdocs_logger_failure(config, paths):
+    from perfdocs.logger import PerfDocLogger
+
+    PerfDocLogger.LOGGER = None
+    with pytest.raises(Exception):
+        PerfDocLogger()
+
+    PerfDocLogger.PATHS = []
+    with pytest.raises(Exception):
+        PerfDocLogger()
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_pylint.py b/tools/lint/test/test_pylint.py
new file mode 100644
index 0000000000..6ee2217089
--- /dev/null
+++ b/tools/lint/test/test_pylint.py
@@ -0,0 +1,24 @@
+import mozunit
+
+LINTER = "pylint"
+
+
+def test_lint_single_file(lint, paths):
+    results = lint(paths("bad.py"))
+    assert len(results) == 3
+    assert results[1].rule == "E0602"
+    assert results[2].rule == "W0101"
+    assert results[2].lineno == 5
+
+    # run lint again to make sure the previous results aren't counted twice
+    results = lint(paths("bad.py"))
+    assert len(results) == 3
+
+
+def test_lint_single_file_good(lint, paths):
+    results = lint(paths("good.py"))
+    assert len(results) == 0
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_rst.py b/tools/lint/test/test_rst.py
new file mode 100644
index 0000000000..532ac332d6
--- /dev/null
+++ b/tools/lint/test/test_rst.py
@@ -0,0 +1,25 @@
+import pytest
+import mozunit
+from mozfile import which
+
+LINTER = "rst"
+pytestmark = pytest.mark.skipif(
+    not which("rstcheck"), reason="rstcheck is not installed"
+)
+
+
+def test_basic(lint, paths):
+    results = lint(paths())
+    assert len(results) == 2
+
+    assert "Title underline too short" in results[0].message
+    assert results[0].level == "error"
+    assert results[0].relpath == "bad.rst"
+
+    assert "Title overline & underline mismatch" in results[1].message
+    assert results[1].level == "error"
+    assert results[1].relpath == "bad2.rst"
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_rustfmt.py b/tools/lint/test/test_rustfmt.py
new file mode 100644
index 0000000000..4eaf333825
--- /dev/null
+++ b/tools/lint/test/test_rustfmt.py
@@ -0,0 +1,44 @@
+import mozunit
+
+
+LINTER = "rustfmt"
+
+
+def test_good(lint, config, paths):
+    results = lint(paths("subdir/good.rs"))
+    print(results)
+    assert len(results) == 0
+
+
+def test_basic(lint, config, paths):
+    results = lint(paths("subdir/bad.rs"))
+    print(results)
+    assert len(results) >= 1
+
+    assert "Reformat rust" in results[0].message
+    assert results[0].level == "warning"
+    assert results[0].lineno == 4
+    assert "bad.rs" in results[0].path
+    assert "Print text to the console" in results[0].diff
+
+
+def test_dir(lint, config, paths):
+    results = lint(paths("subdir/"))
+    print(results)
+    assert len(results) >= 4
+
+    assert "Reformat rust" in results[0].message
+    assert results[0].level == "warning"
+    assert results[0].lineno == 4
+    assert "bad.rs" in results[0].path
+    assert "Print text to the console" in results[0].diff
+
+    assert "Reformat rust" in results[1].message
+    assert results[1].level == "warning"
+    assert results[1].lineno == 4
+    assert "bad2.rs" in results[1].path
+    assert "Print text to the console" in results[1].diff
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_shellcheck.py b/tools/lint/test/test_shellcheck.py
new file mode 100644
index 0000000000..aa6fdc4494
--- /dev/null
+++ b/tools/lint/test/test_shellcheck.py
@@ -0,0 +1,26 @@
+import pytest
+import mozunit
+from mozfile import which
+
+LINTER = "shellcheck"
+pytestmark = pytest.mark.skipif(
+    not which("shellcheck"), reason="shellcheck is not installed"
+)
+
+
+def test_basic(lint, paths):
+    results = lint(paths())
+    print(results)
+    assert len(results) == 2
+
+    assert "hello appears unused" in results[0].message
+    assert results[0].level == "error"
+    assert results[0].relpath == "bad.sh"
+
+    assert "Double quote to prevent" in results[1].message
+    assert results[1].level == "error"
+    assert results[1].relpath == "bad.sh"
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/test/test_yaml.py b/tools/lint/test/test_yaml.py
new file mode 100644
index 0000000000..63b678d152
--- /dev/null
+++ b/tools/lint/test/test_yaml.py
@@ -0,0 +1,28 @@
+import mozunit
+
+LINTER = "yaml"
+
+
+def test_basic(lint, paths):
+    results = lint(paths())
+
+    assert len(results) == 3
+
+    assert "line too long (122 > 80 characters)" in results[0].message
+    assert results[0].level == "error"
+    assert "bad.yml" in results[0].relpath
+    assert results[0].lineno == 3
+
+    assert "wrong indentation: expected 4 but found 8" in results[1].message
+    assert results[1].level == "error"
+    assert "bad.yml" in results[1].relpath
+    assert results[0].lineno == 3
+
+    assert "could not find expected" in results[2].message
+    assert results[2].level == "error"
+    assert "bad.yml" in results[2].relpath
+    assert results[2].lineno == 9
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/tools/lint/tox/tox_requirements.txt b/tools/lint/tox/tox_requirements.txt
new file mode 100644
index 0000000000..fb629566ab
--- /dev/null
+++ b/tools/lint/tox/tox_requirements.txt
@@ -0,0 +1,4 @@
+pluggy==0.4.0 --hash=sha256:d2766caddfbbc8ef641d47da556d2ae3056860ce4d553aa04009e42b76a09951
+py==1.4.33 --hash=sha256:81b5e37db3cc1052de438375605fb5d3b3e97f950f415f9143f04697c684d7eb
+tox==2.7.0 --hash=sha256:0f37ea637ead4a5bbae91531b0bf8fd327c7152e20255e5960ee180598228d21
+virtualenv==15.1.0 --hash=sha256:39d88b533b422825d644087a21e78c45cf5af0ef7a99a1fc9fbb7b481e5c85b0
diff --git a/tools/lint/wpt.yml b/tools/lint/wpt.yml
new file mode 100644
index 0000000000..dd3c0dd042
--- /dev/null
+++ b/tools/lint/wpt.yml
@@ -0,0 +1,10 @@
+---
+wpt:
+    description: web-platform-tests lint
+    include:
+        - testing/web-platform/tests
+    exclude: []
+    support-files:
+        - tools/lint/wpt/wpt.py
+    type: external
+    payload: wpt.wpt:lint
diff --git a/tools/lint/wpt/__init__.py b/tools/lint/wpt/__init__.py
new file mode 100644
index 0000000000..c580d191c1
--- /dev/null
+++ b/tools/lint/wpt/__init__.py
@@ -0,0 +1,3 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
diff --git a/tools/lint/wpt/wpt.py b/tools/lint/wpt/wpt.py
new file mode 100644
index 0000000000..2dcbb39132
--- /dev/null
+++ b/tools/lint/wpt/wpt.py
@@ -0,0 +1,60 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import os
+import sys
+
+from mozprocess import ProcessHandler
+
+from mozlint import result
+
+results = []
+
+
+def lint(files, config, **kwargs):
+    log = kwargs["log"]
+    tests_dir = os.path.join(kwargs["root"], "testing", "web-platform", "tests")
+
+    def process_line(line):
+        try:
+            data = json.loads(line)
+        except ValueError:
+            return
+
+        data["level"] = "error"
+        data["path"] = os.path.relpath(
+            os.path.join(tests_dir, data["path"]), kwargs["root"]
+        )
+        data.setdefault("lineno", 0)
+        results.append(result.from_config(config, **data))
+
+    if files == [tests_dir]:
+        print(
+            "No specific files specified, running the full wpt lint" " (this is slow)",
+            file=sys.stderr,
+        )
+        files = ["--all"]
+    cmd = ["python2", os.path.join(tests_dir, "wpt"), "lint", "--json"] + files
+    log.debug("Command: {}".format(" ".join(cmd)))
+
+    proc = ProcessHandler(
+        cmd, env=os.environ, processOutputLine=process_line, universal_newlines=True
+    )
+    proc.run()
+    try:
+        proc.wait()
+        if proc.returncode != 0:
+            results.append(
+                result.from_config(
+                    config,
+                    message="Lint process exited with return code %s" % proc.returncode,
+                )
+            )
+    except KeyboardInterrupt:
+        proc.kill()
+
+    return results
diff --git a/tools/lint/yaml.yml b/tools/lint/yaml.yml
new file mode 100644
index 0000000000..840ad6eec3
--- /dev/null
+++ b/tools/lint/yaml.yml
@@ -0,0 +1,18 @@
+---
+yamllint:
+    description: YAML linter
+    include:
+        - .cron.yml
+        - .taskcluster.yml
+        - browser/config/
+        - python/mozlint/
+        - security/nss/.taskcluster.yml
+        - taskcluster
+        - testing/mozharness
+        - tools
+    extensions: ['yml', 'yaml']
+    support-files:
+        - '**/.yamllint'
+        - 'tools/lint/yamllint_/**'
+    type: external
+    payload: yamllint_:lint
diff --git a/tools/lint/yamllint_/__init__.py b/tools/lint/yamllint_/__init__.py
new file mode 100644
index 0000000000..24ba4d7c4e
--- /dev/null
+++ b/tools/lint/yamllint_/__init__.py
@@ -0,0 +1,102 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import re
+import os
+import sys
+from collections import defaultdict
+
+from mozbuild.base import MozbuildObject
+
+topsrcdir = MozbuildObject.from_environment().topsrcdir
+
+from mozlint import result
+from mozlint.pathutils import get_ancestors_by_name
+from mozlint.util.implementation import LintProcess
+
+
+YAMLLINT_FORMAT_REGEX = re.compile("(.*):(.*):(.*): \[(error|warning)\] (.*) \((.*)\)$")
+
+results = []
+
+
+class YAMLLintProcess(LintProcess):
+    def process_line(self, line):
+        try:
+            match = YAMLLINT_FORMAT_REGEX.match(line)
+            abspath, line, col, level, message, code = match.groups()
+        except AttributeError:
+            print("Unable to match yaml regex against output: {}".format(line))
+            return
+
+        res = {
+            "path": os.path.relpath(str(abspath), self.config["root"]),
+            "message": str(message),
+            "level": "error",
+            "lineno": line,
+            "column": col,
+            "rule": code,
+        }
+
+        results.append(result.from_config(self.config, **res))
+
+
+def get_yamllint_version():
+    from yamllint import APP_VERSION
+
+    return APP_VERSION
+
+
+def run_process(config, cmd):
+    proc = YAMLLintProcess(config, cmd)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+
+def gen_yamllint_args(cmdargs, paths=None, conf_file=None):
+    args = cmdargs[:]
+    if isinstance(paths, str):
+        paths = [paths]
+    if conf_file and conf_file != "default":
+        return args + ["-c", conf_file] + paths
+    return args + paths
+
+
+def lint(files, config, **lintargs):
+    log = lintargs["log"]
+
+    log.debug("Version: {}".format(get_yamllint_version()))
+
+    cmdargs = [
+        sys.executable,
+        os.path.join(topsrcdir, "mach"),
+        "python",
+        "--",
+        "-m",
+        "yamllint",
+        "-f",
+        "parsable",
+    ]
+    log.debug("Command: {}".format(" ".join(cmdargs)))
+
+    config = config.copy()
+    config["root"] = lintargs["root"]
+
+    # Run any paths with a .yamllint file in the directory separately so
+    # it gets picked up. This means only .yamllint files that live in
+    # directories that are explicitly included will be considered.
+    paths_by_config = defaultdict(list)
+    for f in files:
+        conf_files = get_ancestors_by_name(".yamllint", f, config["root"])
+        paths_by_config[conf_files[0] if conf_files else "default"].append(f)
+
+    for conf_file, paths in paths_by_config.items():
+        run_process(
+            config, gen_yamllint_args(cmdargs, conf_file=conf_file, paths=paths)
+        )
+
+    return results