Despite setting the browser to "start where I left off" my half dozen tab groups are empty undoing all sorting I've spent so much time doing.

Started using this some time ago - worked very well for awhile! Love the interface and configurations available. But now, as many others have noted, it is losing data. Every time I close firefox, all the tabs are deleted from my groups, forcing me to restore from a backup after each browser/computer restart. Also has no sync functionality, meaning I have to manually change/import groups across devices

This has to be one of the most consistent extensions with Firefox. The interface is very transparent. Does not suffer from the issues I often had with TreeStyleTabs.

Love this app! Once I figured out how to use it, it really has transformed by million tabs situation to help my productivity! Thanks!

Quite nice, easy to use. Occasionally everything disappears (the groups are there but the tabs are all "0"), so I just reload from last backup. I would love a way to spec the directory for backups, so I could backup to cloud automatically.

fantastic addon for anyone who needs to work on more than one thing at a time

Lost tabs after a moment, so useless. Otherwise is the best ergonomic Tab groups add-on I tried.

The option "Discard tabs after hide" will close them or just unload them from RAM?

Complete game-changer for productivity use. This extension has drastically changed the way I use my tabs, allowing me to easily partition and keep context in every type of activity I'm working on. I was initially annoyed by the zip backups in downloads, but now that I've set up my tab groups, I'm glad there's a reliable external (and automatic) backup.

It says "it's corrupt"

Just one word: Awesome!

It seems pretty decent, once one understands at least some basics. However, although I can't comment on long use data loss, which other users obviously experienced, since I am only using it for a few days now, for me, I have two main problems with this add-on:
(1) If Firefox is *not* open and I click on a link in another app which opens Firefox, then Firefox is opened *but* the link is not followed. I have to go back to the app and click the link again after FF is open. This sucks.
(2) The context menu of the "tabs" in the side bar to not offer any tab context menu items but *only* custom "Simple Tab Groups" items. This defeats the purpose of the side bar for me, which would be that I could turn off the main tab bar. But then I do not have a tab context menu anymore with this add-on. So, as a work-around I am using the "Tree Style Tab" add-on in the side bar and for now the "Simple Tab Groups" in the tool bar.