Rated 2 out of 5 stars
There is comment from June 1st that says this addon doesn't work with Firefox 5. And you report that it works with Firefox 6?
No good contact form either. You are doing very bad job at supporting your addon. Please fix it for Firefox 5 or i'll have to search for new one.
(Maybe it's just a Linux problem? But you are pointed to the problem and no action for half a month. :( )