Bug 667438 - Choosing "Custom Page" option erases the text from the Start page button [r=mark.finkle]

mobile/chrome/content/preferences.js

@@ -255,6 +255,11 @@ var PreferencesView = {
           display = Browser.selectedBrowser.contentTitle || currentURL;
         }
         break;
+      case "custom":
+        // If value is custom, this means the user is trying to
+        // set homepage to the same custom value. Do nothing in
+        // this case.
+        return;
     }
 
     // Show or hide the title or URL of the custom homepage