diff --git a/.eslintrc.js b/.eslintrc.js
index efe54ec17eed..4e05cd777cc6 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -303,6 +303,60 @@ module.exports = {
         "mozilla/use-console-createInstance": "off",
       },
     },
+    {
+      // Bug 1881270 - Gradually roll-out no-case-declarations to more areas.
+      files: [
+        "accessible/tests/mochitest/promisified-events.js",
+        "browser/actors/**",
+        "browser/base/content/**",
+        "browser/components/**",
+        "browser/modules/BrowserUsageTelemetry.sys.mjs",
+        "browser/modules/URILoadingHelper.sys.mjs",
+        "devtools/client/**",
+        "devtools/server/**",
+        "devtools/shared/layout/dom-matrix-2d.js",
+        "devtools/startup/DevToolsStartup.sys.mjs",
+        "docshell/test/navigation/file_blockBFCache.html",
+        "docshell/test/navigation/test_bug1375833.html",
+        "docshell/test/unit/AllowJavascriptParent.sys.mjs",
+        "dom/base/test/chrome/window_nsITextInputProcessor.xhtml",
+        "dom/html/test/forms/test_input_sanitization.html",
+        "dom/media/PeerConnection.sys.mjs",
+        "dom/media/autoplay/test/mochitest/test_autoplay_policy_web_audio_AudioParamStream.html",
+        "dom/payments/test/PayerDetailsChromeScript.js",
+        "dom/payments/test/simple_payment_request.html",
+        "dom/push/PushService.sys.mjs",
+        "dom/security/test/referrer-policy/browser_referrer_disallow_cross_site_relaxing.js",
+        "dom/tests/mochitest/bugs/test_bug622361.html",
+        "dom/workers/test/sourcemap_header_debugger.js",
+        "gfx/layers/apz/test/mochitest/**",
+        "intl/locale/tests/unit/test_localeService.js",
+        "layout/tools/layout-debug/LayoutDebugChild.sys.mjs",
+        "layout/tools/reftest/reftest.sys.mjs",
+        "mobile/android/actors/**",
+        "mobile/android/components/geckoview/GeckoViewStartup.sys.mjs",
+        "mobile/android/modules/geckoview/**",
+        "netwerk/test/browser/browser_test_data_channel_observer.js",
+        "netwerk/test/unit/test_proxyconnect.js",
+        "remote/**",
+        "services/fxaccounts/**",
+        "services/sync/**",
+        "testing/mochitest/ShutdownLeaksCollector.sys.mjs",
+        "testing/specialpowers/content/SpecialPowers*.sys.mjs",
+        "toolkit/actors/**",
+        "toolkit/components/**",
+        "toolkit/modules/**",
+        "toolkit/mozapps/downloads/DownloadLastDir.sys.mjs",
+        "toolkit/mozapps/extensions/**",
+        "toolkit/mozapps/update/UpdateListener.sys.mjs",
+        "toolkit/content/widgets/**",
+        "uriloader/exthandler/tests/mochitest/browser_download_open_with_internal_handler.js",
+        "widget/tests/file_test_ime_state_on_focus_move.js",
+      ],
+      rules: {
+        "no-case-declarations": "warn",
+      },
+    },
     {
       // Bug 1881268 - Gradually roll-out no-constant-condition to more areas.
       files: [
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js
index 343ea510988c..2c55e472d9f3 100644
--- a/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js
@@ -206,10 +206,6 @@ module.exports = {
     // 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",