When comparing Tab Kit 2 vs Tree Style Tab, the Slant community recommends Tree Style Tab for most people. In the question“What are the best tab management plugins for Firefox?” Tree Style Tab is ranked 2nd while Tab Kit 2 is ranked 5th. The most important reason people chose Tree Style Tab is:
Tree Style allows you to have at least 10 tabs open.
Ranked in these QuestionsQuestion Ranking
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.
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
Pro Organizes multiple tabs
Tree Style allows you to have at least 10 tabs open.
Pro Visibility
It lets you see everything you want to see and auto-hides those you don't.
Pro Fairly stable
It does not seem slow, you'd never have problems that will make you disable the program.
Pro High customization
Pro Theme support
Cons
Con No per-group customization
No way to colorize or otherwise highlight a group of tabs. Can reorder, but not the same.