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CloseReview for Gmail Manager by Provolino
Rated 4 out of 5 stars
Snippets don't work in version 0.6.x, we are all waiting for an update.
In the meantime you can install version 0.5.7.5 with working snippets from here:
http://www. xup.in/dl,20437378/gmail_manager-0.5.7.5-fx+sm.xpi
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