Rated 5 out of 5 stars
Set the button to text "AB" instead of the image. This would pickup colors from any persona and also reduce the size of the addonThis review is for a previous version of the add-on (22.214.171.124-signed.1-signed). This user has other reviews of this add-on.
This will be implemented in the next AdBan version. See http://code.google.com/p/ad-ban-extensions/issues/detail?id=26 .