Bug 1104846 - The search engine favicons are distorted in search preferences on Windows, r=felipe

browser/components/preferences/search.css

@@ -20,6 +20,7 @@
 .checkbox-label-box {
   -moz-box-align: center;
   -moz-appearance: none;
+  border: none;
 }
 
 .checkbox-icon {