When comparing TabGroupsManager revived vs TabCenter, the Slant community recommends TabGroupsManager revived for most people. In the question“What are the best tab management plugins for Firefox?” TabGroupsManager revived is ranked 1st while TabCenter is ranked 3rd. The most important reason people chose TabGroupsManager revived is:
You can get up to about 2000 tabs per profile, though you start running into some issues after about 1000 tabs. How much RAM is available seems to be the main limitation. It's also easy to create tab groups and to move tabs between them.
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Pros
Pro Way easier to manage large amounts of tabs
You can get up to about 2000 tabs per profile, though you start running into some issues after about 1000 tabs. How much RAM is available seems to be the main limitation. It's also easy to create tab groups and to move tabs between them.
Pro Revived
The person who did the original version stopped work on it and is presumed dead in the Fukushima disaster. A group came together to redo this extension and get it to work on newer versions of Firefox.
Pro Tabgroups can be exported
You can export a tabgroup and drag/drop it into another profile to copy a tabgroup elsewhere.
Pro Frees up screen real estate where it's critical
The tab center is about the same size as the regular tab bar, but vertical. Most people have a wide screen monitor, and therefor plenty of horizontal space to spare. Vertical space comes at more of a premium. Tab Center addresses this really well.
Cons
Con Higher memory usage
Having a large number of tabs is going to raise memory usage.