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CloseReview for Session Manager by ChavezJ
Rated 5 out of 5 stars
This was my favorite and most used extension, no similar extension come close. It should be a core feature, but I would have gladly paid a reasonable price for a new version that will work with the latest version of Firefox.
I wonder if developer is considering developing a new version. I'm willing to kick-n $50.00 US.
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