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Review of Tab Kit 2 powered by the Slant community.
Vastly more capable & flexible than the other add-ons listed. Easily manage huge numbers of tabs in groups & sub-groups. Color-coding, group save, tab duplication & dozens of other features. Stack tab tree left or right (frees up tons of screen space), top or bottom. Drag & drop to relocate & manage. Incredible for organizing research. Chrome is fast, but this one app makes Firefox far more useful.
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Pros
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.