I would rate the previous version (maybe it's not updated at all, but just Firefox updated!) as top five star, however now this tool has not been displayed as a full toolbar. Instead, it now displays as a button... It's terrible. I would believe Firefox to blame. Firefox new versions have destroyed so many great addons!

However, for the author of the addon, it would be of great help if you can update the tool to get compatible with Firefox... Thanks in advance!