diff --git a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_console.js b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_console.js
index 053db9201376..0df35d9cdb63 100644
--- a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_console.js
+++ b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_console.js
@@ -18,9 +18,6 @@ requestLongerTimeout(2);
 const ADDON_ID = "test-devtools-webextension@mozilla.org";
 const ADDON_NAME = "test-devtools-webextension";
 
-// This is a migration from:
-// https://searchfox.org/mozilla-central/source/devtools/client/aboutdebugging/test/browser_addons_debug_webextension.js
-
 /**
  * This test file ensures that the webextension addon developer toolbox:
  * - when the debug button is clicked on a webextension, the opened toolbox
diff --git a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_inspector.js b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_inspector.js
index 6c00538f1be1..12e7dcd126e0 100644
--- a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_inspector.js
+++ b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_inspector.js
@@ -18,9 +18,6 @@ requestLongerTimeout(2);
 const ADDON_ID = "test-devtools-webextension@mozilla.org";
 const ADDON_NAME = "test-devtools-webextension";
 
-// This is a migration from:
-// https://searchfox.org/mozilla-central/source/devtools/client/aboutdebugging/test/browser_addons_debug_webextension_inspector.js
-
 /**
  * This test file ensures that the webextension addon developer toolbox:
  * - the webextension developer toolbox has a working Inspector panel, with the
diff --git a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_popup.js b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_popup.js
index 9881c1884330..1533ffdb6d9a 100644
--- a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_popup.js
+++ b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_popup.js
@@ -18,9 +18,6 @@ requestLongerTimeout(2);
 const ADDON_ID = "test-devtools-webextension@mozilla.org";
 const ADDON_NAME = "test-devtools-webextension";
 
-// This is a migration from:
-// https://searchfox.org/mozilla-central/source/devtools/client/aboutdebugging/test/browser_addons_debug_webextension_popup.js
-
 /**
  * This test file ensures that the webextension addon developer toolbox:
  * - when the debug button is clicked on a webextension, the opened toolbox
diff --git a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_runtime-page.js b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_runtime-page.js
index 7de869df0738..000fd50b2462 100644
--- a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_runtime-page.js
+++ b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_runtime-page.js
@@ -17,9 +17,6 @@ Services.scriptloader.loadSubScript(
 const SW_TAB_URL = URL_ROOT + "resources/service-workers/push-sw.html";
 const SW_URL = URL_ROOT + "resources/service-workers/push-sw.js";
 
-// This is a migration from:
-// https://searchfox.org/mozilla-central/source/devtools/client/aboutdebugging/test/browser_service_workers.js
-
 /**
  * Test that service workers appear and dissapear from the runtime page when they
  * are registered / unregistered.
diff --git a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_start.js b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_start.js
index 65a4716b09c0..d6f0e95c945f 100644
--- a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_start.js
+++ b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_start.js
@@ -12,9 +12,6 @@ Services.scriptloader.loadSubScript(
 const SW_TAB_URL = URL_ROOT + "resources/service-workers/empty-sw.html";
 const SW_URL = URL_ROOT + "resources/service-workers/empty-sw.js";
 
-// This is a migration from:
-// https://searchfox.org/mozilla-central/source/devtools/client/aboutdebugging/test/browser_service_workers_start.js
-
 /**
  * Test that service workers can be started using about:debugging.
  */
diff --git a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_timeout.js b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_timeout.js
index e739f11c6b5c..64cfb3ff2857 100644
--- a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_timeout.js
+++ b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_timeout.js
@@ -17,9 +17,6 @@ const SW_TAB_URL = URL_ROOT + "resources/service-workers/empty-sw.html";
 const SW_URL = URL_ROOT + "resources/service-workers/empty-sw.js";
 const SW_TIMEOUT = 4000;
 
-// This is a migration from:
-// https://searchfox.org/mozilla-central/source/devtools/client/aboutdebugging/test/browser_service_workers_timeout.js
-
 /**
  * Test that service workers will _not_ timeout and be stopped when a toolbox is attached
  * to them. Feature implemented in Bug 1228382.
diff --git a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_unregister.js b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_unregister.js
index b4c7e9675354..df0151d57c5f 100644
--- a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_unregister.js
+++ b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_serviceworker_unregister.js
@@ -12,9 +12,6 @@ Services.scriptloader.loadSubScript(
 const SW_TAB_URL = URL_ROOT + "resources/service-workers/empty-sw.html";
 const SW_URL = URL_ROOT + "resources/service-workers/empty-sw.js";
 
-// This is a migration from:
-// https://searchfox.org/mozilla-central/source/devtools/client/aboutdebugging/test/browser_service_workers_unregister.js
-
 /**
  * Test that service workers can be started using about:debugging.
  */