diff --git a/dom/webidl/IdleDeadline.webidl b/dom/webidl/IdleDeadline.webidl
index afc834aea..7db900c56 100644
--- a/dom/webidl/IdleDeadline.webidl
+++ b/dom/webidl/IdleDeadline.webidl
@@ -7,7 +7,7 @@
  * https://w3c.github.io/requestidlecallback/
  */
 
-[Pref="dom.requestIdleCallback.enabled"]
+[Pref="tenfourfox.dom.requestIdleCallback.enabled"]
 interface IdleDeadline {
   DOMHighResTimeStamp timeRemaining();
   readonly attribute boolean didTimeout;
diff --git a/dom/webidl/Window.webidl b/dom/webidl/Window.webidl
index 0446f25d8..22b0539cf 100644
--- a/dom/webidl/Window.webidl
+++ b/dom/webidl/Window.webidl
@@ -496,7 +496,7 @@ Window implements GlobalFetch;
 Window implements ImageBitmapFactories;
 
 partial interface Window {
-  [Throws, Pref="dom.requestIdleCallback.enabled"]
+  [Throws, Pref="tenfourfox.dom.requestIdleCallback.enabled"]
   unsigned long requestIdleCallback(IdleRequestCallback callback,
                                     optional IdleRequestOptions options);
   [Pref="dom.requestIdleCallback.enabled"]
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index c1f6981ce..371ca2448 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1043,7 +1043,7 @@ pref("dom.disable_window_open_feature.status",      true);
 pref("dom.allow_scripts_to_close_windows",          false);
 
 // TenFourFox issue 463
-pref("dom.requestIdleCallback.enabled",             false);
+pref("tenfourfox.dom.requestIdleCallback.enabled",  true);
 
 pref("dom.require_user_interaction_for_beforeunload", true);