Bug 304574 Don't re-fetch images for URL bar favicon

r=mconnor

browser/base/content/browser.xul

@@ -238,7 +238,7 @@
               <image id="page-proxy-button"
                       ondraggesture="PageProxyDragGesture(event);"
                       tooltiptext="&proxyIcon.tooltip;"/>
-              <image id="page-proxy-favicon"
+              <image id="page-proxy-favicon" validate="never"
                       ondraggesture="PageProxyDragGesture(event);"
                       onload="this.parentNode.selectedIndex = 1;
                               event.stopPropagation();"