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CloseReview for Session Manager by Firefox user 5376f4
Rated 5 out of 5 stars
When I realized it was not compatible with F57, I though it was because Firefox team implemented a built-in tool to manage sessions. Not this the reason, I'm thinking doing a roll back to previous Firefox version.
This review is for a previous version of the add-on (0.8.1.13).To create your own collections, you must have a Mozilla Add-ons account.