diff --git a/apps/browser/src/autofill/services/collect-autofill-content.service.ts b/apps/browser/src/autofill/services/collect-autofill-content.service.ts
index c637afb5a02..d09a69b7800 100644
--- a/apps/browser/src/autofill/services/collect-autofill-content.service.ts
+++ b/apps/browser/src/autofill/services/collect-autofill-content.service.ts
@@ -22,6 +22,7 @@ import {
   nodeIsInputElement,
   sendExtensionMessage,
   requestIdleCallbackPolyfill,
+  cancelIdleCallbackPolyfill,
 } from "../utils";
 
 import { AutofillOverlayContentService } from "./abstractions/autofill-overlay-content.service";
@@ -45,7 +46,7 @@ class CollectAutofillContentService implements CollectAutofillContentServiceInte
   private elementInitializingIntersectionObserver: Set<Element> = new Set();
   private mutationObserver: MutationObserver;
   private mutationsQueue: MutationRecord[][] = [];
-  private updateAfterMutationIdleCallback: number;
+  private updateAfterMutationIdleCallback: NodeJS.Timeout | number;
   private readonly updateAfterMutationTimeout = 1000;
   private readonly formFieldQueryString;
   private readonly nonInputFormFieldTags = new Set(["textarea", "select"]);
@@ -1228,10 +1229,10 @@ class CollectAutofillContentService implements CollectAutofillContentServiceInte
    */
   private updateAutofillElementsAfterMutation() {
     if (this.updateAfterMutationIdleCallback) {
-      globalThis.cancelIdleCallback(this.updateAfterMutationIdleCallback);
+      cancelIdleCallbackPolyfill(this.updateAfterMutationIdleCallback);
     }
 
-    this.updateAfterMutationIdleCallback = globalThis.requestIdleCallback(
+    this.updateAfterMutationIdleCallback = requestIdleCallbackPolyfill(
       this.getPageDetails.bind(this),
       { timeout: this.updateAfterMutationTimeout },
     );
@@ -1480,7 +1481,7 @@ class CollectAutofillContentService implements CollectAutofillContentServiceInte
    */
   destroy() {
     if (this.updateAfterMutationIdleCallback) {
-      globalThis.cancelIdleCallback(this.updateAfterMutationIdleCallback);
+      cancelIdleCallbackPolyfill(this.updateAfterMutationIdleCallback);
     }
     this.mutationObserver?.disconnect();
     this.intersectionObserver?.disconnect();
diff --git a/apps/browser/src/autofill/utils/index.ts b/apps/browser/src/autofill/utils/index.ts
index e5d20cf9f59..745e7a9548f 100644
--- a/apps/browser/src/autofill/utils/index.ts
+++ b/apps/browser/src/autofill/utils/index.ts
@@ -7,7 +7,10 @@ import { FillableFormFieldElement, FormFieldElement } from "../types";
  * @param callback - The callback function to run when the browser is idle.
  * @param options - The options to pass to the requestIdleCallback function.
  */
-export function requestIdleCallbackPolyfill(callback: () => void, options?: Record<string, any>) {
+export function requestIdleCallbackPolyfill(
+  callback: () => void,
+  options?: Record<string, any>,
+): number | NodeJS.Timeout {
   if ("requestIdleCallback" in globalThis) {
     return globalThis.requestIdleCallback(() => callback(), options);
   }
@@ -15,6 +18,14 @@ export function requestIdleCallbackPolyfill(callback: () => void, options?: Reco
   return globalThis.setTimeout(() => callback(), 1);
 }
 
+export function cancelIdleCallbackPolyfill(id: NodeJS.Timeout | number) {
+  if ("cancelIdleCallback" in globalThis) {
+    return globalThis.cancelIdleCallback(id as number);
+  }
+
+  return globalThis.clearTimeout(id);
+}
+
 /**
  * Generates a random string of characters that formatted as a custom element name.
  */