diff --git a/browser/components/thumbnails/PageThumbs.jsm b/browser/components/thumbnails/PageThumbs.jsm
index c61bb1a35f8..c165e2e5246 100644
--- a/browser/components/thumbnails/PageThumbs.jsm
+++ b/browser/components/thumbnails/PageThumbs.jsm
@@ -485,7 +485,7 @@ let PageThumbsWorker = {
    */
   get _worker() {
     delete this._worker;
-    this._worker = new ChromeWorker("resource://gre/modules/PageThumbsWorker.js");
+    this._worker = new ChromeWorker("resource:///modules/PageThumbsWorker.js");
     this._worker.addEventListener("message", this);
     return this._worker;
   },