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CloseReview for Update Notifier by Draconis
Rated 5 out of 5 stars
This extension is so very useful that it should be standard in Firefox and Thunderbird. I no longer have to remember to check for updates to my numerous extensions.
I got it to work with Thunderbird 2.0 by using MR Tech Local Install and checking the "Override 'maxVersion' compatibility checking" box.
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