diff --git a/docshell/test/browser/browser_timelineMarkers-frame-02.js b/docshell/test/browser/browser_timelineMarkers-frame-02.js
index b4b3efe49f77..97620acf728f 100644
--- a/docshell/test/browser/browser_timelineMarkers-frame-02.js
+++ b/docshell/test/browser/browser_timelineMarkers-frame-02.js
@@ -1,6 +1,8 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
 
+/* eslint-env mozilla/frame-script */
+
 // This file expects frame-head.js to be loaded in the environment.
 /* import-globals-from frame-head.js */
 
diff --git a/docshell/test/browser/browser_timelineMarkers-frame-03.js b/docshell/test/browser/browser_timelineMarkers-frame-03.js
index 2368b360636d..4758df7fec20 100644
--- a/docshell/test/browser/browser_timelineMarkers-frame-03.js
+++ b/docshell/test/browser/browser_timelineMarkers-frame-03.js
@@ -1,6 +1,8 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
 
+/* eslint-env mozilla/frame-script */
+
 // This file expects frame-head.js to be loaded in the environment.
 /* import-globals-from frame-head.js */
 
diff --git a/docshell/test/browser/browser_timelineMarkers-frame-04.js b/docshell/test/browser/browser_timelineMarkers-frame-04.js
index a05804c5b38c..a6189809d242 100644
--- a/docshell/test/browser/browser_timelineMarkers-frame-04.js
+++ b/docshell/test/browser/browser_timelineMarkers-frame-04.js
@@ -1,6 +1,8 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
 
+/* eslint-env mozilla/frame-script */
+
 // This file expects frame-head.js to be loaded in the environment.
 /* import-globals-from frame-head.js */
 
diff --git a/docshell/test/browser/browser_timelineMarkers-frame-05.js b/docshell/test/browser/browser_timelineMarkers-frame-05.js
index b5c245e4517d..b6b128e26976 100644
--- a/docshell/test/browser/browser_timelineMarkers-frame-05.js
+++ b/docshell/test/browser/browser_timelineMarkers-frame-05.js
@@ -1,6 +1,8 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
 
+/* eslint-env mozilla/frame-script */
+
 // This file expects frame-head.js to be loaded in the environment.
 /* import-globals-from frame-head.js */
 
diff --git a/dom/messagechannel/tests/mm_messageChannel.js b/dom/messagechannel/tests/mm_messageChannel.js
index 443a7949e247..3bd0f5be478b 100644
--- a/dom/messagechannel/tests/mm_messageChannel.js
+++ b/dom/messagechannel/tests/mm_messageChannel.js
@@ -1,3 +1,5 @@
+/* eslint-env mozilla/frame-script */
+
 function debug(msg) {
   dump("[mmMessageChannelChild]" + msg + "\n");
 }
diff --git a/remote/marionette/reftest-content.js b/remote/marionette/reftest-content.js
index 4f481217eb45..3c0712f23277 100644
--- a/remote/marionette/reftest-content.js
+++ b/remote/marionette/reftest-content.js
@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+/* eslint-env mozilla/frame-script */
+
 "use strict";
 
 const { XPCOMUtils } = ChromeUtils.importESModule(
diff --git a/testing/mochitest/shutdown-leaks-collector.js b/testing/mochitest/shutdown-leaks-collector.js
index fc4e7a5c7f3f..23e164c38f9f 100644
--- a/testing/mochitest/shutdown-leaks-collector.js
+++ b/testing/mochitest/shutdown-leaks-collector.js
@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+/* eslint-env mozilla/frame-script */
+
 // We run this code in a .jsm rather than here to avoid keeping the current
 // compartment alive.
 ChromeUtils.import("chrome://mochikit/content/ShutdownLeaksCollector.jsm");
diff --git a/testing/talos/talos/pageloader/chrome/Profiler.js b/testing/talos/talos/pageloader/chrome/Profiler.js
index e23efbc666cc..696bd73a6047 100644
--- a/testing/talos/talos/pageloader/chrome/Profiler.js
+++ b/testing/talos/talos/pageloader/chrome/Profiler.js
@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+/* eslint-env mozilla/frame-script */
+
 // - NOTE: This file is duplicated verbatim at:
 //         - talos/pageloader/chrome/Profiler.js
 //         - talos/tests/tart/addon/content/Profiler.js
diff --git a/testing/talos/talos/pageloader/chrome/a11y.js b/testing/talos/talos/pageloader/chrome/a11y.js
index 83480882f2d8..302ca0ed1f84 100644
--- a/testing/talos/talos/pageloader/chrome/a11y.js
+++ b/testing/talos/talos/pageloader/chrome/a11y.js
@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+/* eslint-env mozilla/frame-script */
+
 (function() {
   let gAccService = 0;
 
diff --git a/testing/talos/talos/pageloader/chrome/lh_dummy.js b/testing/talos/talos/pageloader/chrome/lh_dummy.js
index e782b2b67290..134efd4ef1af 100644
--- a/testing/talos/talos/pageloader/chrome/lh_dummy.js
+++ b/testing/talos/talos/pageloader/chrome/lh_dummy.js
@@ -1,6 +1,9 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* eslint-env mozilla/frame-script */
+
 function _dummy() {
   sendAsyncMessage("PageLoader:LoadEvent", {});
 }
diff --git a/testing/talos/talos/pageloader/chrome/lh_fnbpaint.js b/testing/talos/talos/pageloader/chrome/lh_fnbpaint.js
index 2918fda67238..5ef0066ad288 100644
--- a/testing/talos/talos/pageloader/chrome/lh_fnbpaint.js
+++ b/testing/talos/talos/pageloader/chrome/lh_fnbpaint.js
@@ -1,6 +1,9 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* eslint-env mozilla/frame-script */
+
 var gErr =
   "Abort: firstNonBlankPaint value is not available after loading the page";
 var gRetryCounter = 0;
diff --git a/testing/talos/talos/pageloader/chrome/lh_hero.js b/testing/talos/talos/pageloader/chrome/lh_hero.js
index 6b4d95a079d9..caef53f37409 100644
--- a/testing/talos/talos/pageloader/chrome/lh_hero.js
+++ b/testing/talos/talos/pageloader/chrome/lh_hero.js
@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+/* eslint-env mozilla/frame-script */
+
 function _contentHeroHandler(isload) {
   var obs = null;
   var el = content.window.document.querySelector("[elementtiming]");
diff --git a/testing/talos/talos/pageloader/chrome/lh_moz.js b/testing/talos/talos/pageloader/chrome/lh_moz.js
index 5bbdae6ea976..46d4a74a7c23 100644
--- a/testing/talos/talos/pageloader/chrome/lh_moz.js
+++ b/testing/talos/talos/pageloader/chrome/lh_moz.js
@@ -1,6 +1,9 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* eslint-env mozilla/frame-script */
+
 function _contentPaintHandler() {
   var utils = content.windowUtils;
   if (utils.isMozAfterPaintPending) {
diff --git a/testing/talos/talos/pageloader/chrome/lh_pdfpaint.js b/testing/talos/talos/pageloader/chrome/lh_pdfpaint.js
index 6562d47c9dba..0f1eff6da931 100644
--- a/testing/talos/talos/pageloader/chrome/lh_pdfpaint.js
+++ b/testing/talos/talos/pageloader/chrome/lh_pdfpaint.js
@@ -1,6 +1,9 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* eslint-env mozilla/frame-script */
+
 function _pdfPaintHandler() {
   content.window.addEventListener(
     "pagerendered",
diff --git a/testing/talos/talos/pageloader/chrome/talos-content.js b/testing/talos/talos/pageloader/chrome/talos-content.js
index 1189d456df12..ca21388c2c87 100644
--- a/testing/talos/talos/pageloader/chrome/talos-content.js
+++ b/testing/talos/talos/pageloader/chrome/talos-content.js
@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+/* eslint-env mozilla/frame-script */
+
 const TalosContent = {
   init() {
     addMessageListener("Talos:ForceGC", this);
diff --git a/testing/talos/talos/pageloader/chrome/tscroll.js b/testing/talos/talos/pageloader/chrome/tscroll.js
index ecfc009bb5d4..03e039b58357 100644
--- a/testing/talos/talos/pageloader/chrome/tscroll.js
+++ b/testing/talos/talos/pageloader/chrome/tscroll.js
@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+/* eslint-env mozilla/frame-script */
+
 // Note: This file is used at both tscrollx and tp5o_scroll. With the former as
 //       unprivileged code.
 // - Please make sure that any changes apply cleanly to all use cases.
diff --git a/testing/talos/talos/pageloader/chrome/utils.js b/testing/talos/talos/pageloader/chrome/utils.js
index 368395d96bdb..e326f6c6a4a4 100644
--- a/testing/talos/talos/pageloader/chrome/utils.js
+++ b/testing/talos/talos/pageloader/chrome/utils.js
@@ -1,6 +1,9 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* eslint-env mozilla/frame-script */
+
 var idleCallbackHandle;
 
 function _idleCallbackHandler() {
diff --git a/testing/talos/talos/talos-powers/chrome/talos-powers-content.js b/testing/talos/talos/talos-powers/chrome/talos-powers-content.js
index c008648162a3..9d0af680fc00 100644
--- a/testing/talos/talos/talos-powers/chrome/talos-powers-content.js
+++ b/testing/talos/talos/talos-powers/chrome/talos-powers-content.js
@@ -2,9 +2,7 @@
  * License, v. 2.0. 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 is loaded as a framescript
-/* global docShell */
-// eslint-env mozilla/frame-script
+/* eslint-env mozilla/frame-script */
 
 addEventListener(
   "TalosContentProfilerCommand",
diff --git a/testing/talos/talos/talos-powers/content/TalosContentProfiler.js b/testing/talos/talos/talos-powers/content/TalosContentProfiler.js
index 7d13601d5d13..bcd5b4ff0006 100644
--- a/testing/talos/talos/talos-powers/content/TalosContentProfiler.js
+++ b/testing/talos/talos/talos-powers/content/TalosContentProfiler.js
@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+/* eslint-env mozilla/frame-script */
+
 /**
  * This utility script is for instrumenting your Talos test for
  * performance profiles while running within content. If your test
diff --git a/testing/talos/talos/tests/cpstartup/extension/framescript.js b/testing/talos/talos/tests/cpstartup/extension/framescript.js
index 347bc5318c5c..13b13c81aa93 100644
--- a/testing/talos/talos/tests/cpstartup/extension/framescript.js
+++ b/testing/talos/talos/tests/cpstartup/extension/framescript.js
@@ -1,3 +1,5 @@
+/* eslint-env mozilla/frame-script */
+
 (function() {
   sendAsyncMessage("CPStartup:BrowserChildReady", {
     time: Services.telemetry.msSystemNow(),
diff --git a/testing/talos/talos/tests/tabpaint/framescript.js b/testing/talos/talos/tests/tabpaint/framescript.js
index b8ac5c566bd6..2253a0797b1a 100644
--- a/testing/talos/talos/tests/tabpaint/framescript.js
+++ b/testing/talos/talos/tests/tabpaint/framescript.js
@@ -1,3 +1,5 @@
+/* eslint-env mozilla/frame-script */
+
 (function() {
   addEventListener(
     "load",
diff --git a/testing/talos/talos/tests/tart/addon/content/framescript.js b/testing/talos/talos/tests/tart/addon/content/framescript.js
index 3a0e5e6d1b15..3d34b91a3220 100644
--- a/testing/talos/talos/tests/tart/addon/content/framescript.js
+++ b/testing/talos/talos/tests/tart/addon/content/framescript.js
@@ -1,3 +1,5 @@
+/* eslint-env mozilla/frame-script */
+
 (function() {
   const TART_PREFIX = "tart@mozilla.org:";
 
diff --git a/testing/talos/talos/tests/tresize/addon/content/framescript.js b/testing/talos/talos/tests/tresize/addon/content/framescript.js
index 61b655fbd526..d12bca1c645c 100644
--- a/testing/talos/talos/tests/tresize/addon/content/framescript.js
+++ b/testing/talos/talos/tests/tresize/addon/content/framescript.js
@@ -1,3 +1,5 @@
+/* eslint-env mozilla/frame-script */
+
 (function() {
   const TRESIZE_PREFIX = "tresize@mozilla.org:";