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CloseReview for Reply Monitor by opto
Rated 4 out of 5 stars
in a communication tree, soon there is a collection of
messages -re --re re --- re re re etc.
If I answer a single email and my mail starts with re: subject, it is immediately noted as 'already replied to' after sending. Doesn't wait for actual replies to come in. Win 7, newest TB.
For messages without re: very convinient addon
To create your own collections, you must have a Mozilla Add-ons account.