diff --git a/4chan_x.user.js b/4chan_x.user.js
index bd4141a52..04b2260f4 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -3319,6 +3319,9 @@
         url = href + '?' + Date.now();
       }
       timeoutID = setTimeout(imgExpand.expand, 10000, thumb, url);
+      if (!(engine === 'webkit' && url.split('/')[2] === 'image.4chan.org')) {
+        return;
+      }
       return $.ajax(url, {
         onreadystatechange: (function() {
           if (this.status === 404) return clearTimeout(timeoutID);
diff --git a/script.coffee b/script.coffee
index f7211ad63..0d9d26bd7 100644
--- a/script.coffee
+++ b/script.coffee
@@ -2548,6 +2548,9 @@ imgExpand =
       url = href + '?' + Date.now()
     #navigator.online is not x-browser/os yet
     timeoutID = setTimeout imgExpand.expand, 10000, thumb, url
+    # Only Chrome let userscript break through cross domain requests.
+    # Don't check it 404s in the archivers.
+    return unless engine is 'webkit' and url.split('/')[2] is 'image.4chan.org'
     $.ajax url, onreadystatechange: (-> clearTimeout timeoutID if @status is 404),
       type: 'head'