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CloseReview for Update Notifier by Kal.El
Rated 5 out of 5 stars
You can make it to work with TB3. You just need to unzip it (XPI is ZIP file), edit file install.rdf, find 3.0b2 and modify it with 3.1 , save file, compress all files to ZIP again, rename extension from ZIP to XPI and it's done - you can install and run it with TB3
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