When comparing TabGroupsManager revived vs Tab Kit 2, 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 Tab Kit 2 is ranked 5th. 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 Multiple layers of groups & sub-groups; easily collapse or expand
Pro Infinitely flexible tab trees
Pro Vertical Tab Bar
Vertical tab bars are a must have feature. Even on modern wide-screen monitors you can only comfortably read up to about 10 open tabs. For example, if you have 18 tabs open, you get half-way down the window.
Pro Groups easily saved / restored
Pro Groups color-coded for easy recognition
Pro Duplicate tabs, drag & drop to re-order or re-group, many more.
Pro Locate tabs left or right, top or bottom
Cons
Con Higher memory usage
Having a large number of tabs is going to raise memory usage.