diff --git a/assets/resources/scriptlets.js b/assets/resources/scriptlets.js
index f1722ee93..051b6e218 100644
--- a/assets/resources/scriptlets.js
+++ b/assets/resources/scriptlets.js
@@ -155,6 +155,12 @@ function safeSelf() {
             }, []);
             return this.Object_fromEntries(entries);
         },
+        onIdle(fn, options) {
+            if ( self.requestIdleCallback ) {
+                return self.requestIdleCallback(fn, options);
+            }
+            return self.requestAnimationFrame(fn);
+        },
     };
     scriptletGlobals.safeSelf = safe;
     if ( scriptletGlobals.bcSecret === undefined ) { return safe; }
@@ -2232,7 +2238,7 @@ function removeAttr(
             }
         }
         if ( skip ) { return; }
-        timer = self.requestIdleCallback(rmattr, { timeout: 67 });
+        timer = safe.onIdle(rmattr, { timeout: 67 });
     };
     const start = ( ) => {
         rmattr();
@@ -2310,7 +2316,7 @@ function removeClass(
             }
         }
         if ( skip ) { return; }
-        timer = self.requestIdleCallback(rmclass, { timeout: 67 });
+        timer = safe.onIdle(rmclass, { timeout: 67 });
     };
     const observer = new MutationObserver(mutationHandler);
     const start = ( ) => {
@@ -3523,7 +3529,7 @@ function hrefSanitizer(
             if ( shouldSanitize ) { break; }
         }
         if ( shouldSanitize === false ) { return; }
-        timer = self.requestIdleCallback(( ) => {
+        timer = safe.onIdle(( ) => {
             timer = undefined;
             sanitize();
         });