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Rated 5 out of 5 stars
Allowed me to test an otherwise "Uncompatible with Firefox 9" add-on, and report that it was working for other users.
Easy to use and usefull add-on, for anyone who want to test and/or report "uncompatible" add-ons.
PS: @Mozilla, you broke your browser's users base with your let's-follow-Chrome-big-numbers release system. It was and still is totally unadapted to the Mozilla GREAT add-ons eco-system.