Add-ons
To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
CloseWelcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.
CloseReview for Mark Read On Reply and Reply-All by DanVkx
Rated 1 out of 5 stars
I need this extension... But it not work in 38.6.0
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