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CloseReview for Gmail Manager by nicstoun
Rated 5 out of 5 stars
Yes, is i try 5.7.5 is work now :) So scroll down if your version is 0.5.7.4 and get this
https://addons.mozilla.org/en-US/firefox/downloads/file/65919/gmail_manager-0.5.7.5-fx+sm.xpi.
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