diff --git a/browser/base/content/nsContextMenu.js b/browser/base/content/nsContextMenu.js
index e73b53cbf36..d8525e42f81 100644
--- a/browser/base/content/nsContextMenu.js
+++ b/browser/base/content/nsContextMenu.js
@@ -1402,5 +1402,11 @@ nsContextMenu.prototype = {
     var clipboard = Cc["@mozilla.org/widget/clipboardhelper;1"].
                     getService(Ci.nsIClipboardHelper);
     clipboard.copyString(this.mediaURL);
+  },
+
+  get imageURL() {
+    if (this.onImage)
+      return this.mediaURL;
+    return "";
   }
 };