--- a/toolkit/components/thumbnails/content/backgroundPageThumbsContent.js
+++ b/toolkit/components/thumbnails/content/backgroundPageThumbsContent.js
@@ -41,16 +41,17 @@ const backgroundPageThumbsContent = {
     docShell.allowPlugins = false;
     docShell.allowContentRetargeting = false;
     let defaultFlags = Ci.nsIRequest.LOAD_ANONYMOUS |
                        Ci.nsIRequest.LOAD_BYPASS_CACHE |
                        Ci.nsIRequest.INHIBIT_CACHING |
                        Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_HISTORY;
     docShell.defaultLoadFlags = defaultFlags;
     docShell.sandboxFlags |= SANDBOXED_AUXILIARY_NAVIGATION;
+    docShell.useTrackingProtection = true;
 
     addMessageListener("BackgroundPageThumbs:capture",
                        this._onCapture.bind(this));
     docShell.
       QueryInterface(Ci.nsIInterfaceRequestor).
       getInterface(Ci.nsIWebProgress).
       addProgressListener(this, Ci.nsIWebProgress.NOTIFY_STATE_WINDOW);
   },