diff --git a/4chan_x.js b/4chan_x.js
index 137476d7e..fc306ea8e 100644
--- a/4chan_x.js
+++ b/4chan_x.js
@@ -1675,7 +1675,7 @@
     haloSFW: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAZklEQVR4XrWRQQoAIQwD+6L97j7Ih9WTQQxhDqJQCk4Mranuvqod6LgwawSqSuUmWSPw/UNlJlnDAmA2ARjABLYj8ZyCzJHHqOg+GdAKZmKPIQUzuYrxicHqEgHzP9g7M0+hj45sAnRWxtPj3zSPAAAAAElFTkSuQmCC',
     haloNSFW: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAgMAAABinRfyAAAADFBMVEUAAABmzDP///8AAABet0i+AAAAAXRSTlMAQObYZgAAAExJREFUeF4tyrENgDAMAMFXKuQswQLBG3mOlBnFS1gwDfIYLpEivvjq2MlqjmYvYg5jWEzCwtDSQlwcXKCVLrpFbvLvvSf9uZJ2HusDtJAY7Tkn1oYAAAAASUVORK5CYII=',
     update: function() {
-      var favicon, href, l;
+      var clone, favicon, href, l;
       l = unread.replies.length;
       if (g.dead) {
         if (l > 0) {
@@ -1691,8 +1691,10 @@
         }
       }
       favicon = $('link[rel="shortcut icon"]', d.head);
-      favicon.setAttribute('type', 'image/x-icon');
-      return favicon.href = href;
+      clone = favicon.cloneNode(true);
+      clone.href = href;
+      clone.setAttribute('type', 'image/x-icon');
+      return $.replace(favicon, clone);
     }
   };
   redirect = function() {
diff --git a/script.coffee b/script.coffee
index c065ee5f9..e29a4a430 100644
--- a/script.coffee
+++ b/script.coffee
@@ -1319,9 +1319,12 @@ Favicon =
       else
         href = Favicon.default
 
+    #XXX `favicon.href = href` doesn't work on Firefox
     favicon = $ 'link[rel="shortcut icon"]', d.head
-    favicon.setAttribute 'type', 'image/x-icon'
-    favicon.href = href
+    clone = favicon.cloneNode true
+    clone.href = href
+    clone.setAttribute 'type', 'image/x-icon'
+    $.replace favicon, clone
 
 
 redirect = ->