Yep use UserChrome.css is the more sensible option so that the changes are saved when upgrading firefox. Thought id add the little tip for live bookmarks that don’t change their icon: ...

Icon sets are font and icon toolkits based on CSS. Icon sets can be used on websites by inserting a small code snippet where you'd like an icon to appear either adjacent to text or on its own. Some ...

Firefox versions 3.6 and 4 still don't fully support CSS3, so the magnifications work but not the icon bounce. While this is an interesting experiment, it also shows some of where browser-based ...