Tree-style tabs is life-changing if you do any kind of work that involves having a lot of tabs open at once. Having them easily grouped by project/subject/whatever you want makes going back to traditional tabs feel like such a mess! I've been a happy user of this extension for years.

Great tool to structure tabs for tab-hoarder like me!
Only one thing could make this better - If the structure would somehow be saved when I use my "OneTab" extension.
If you could work with that developer to get that then this is worth 6 stars :)

Also I like the little pop up message about how how to hide Tree tabs and regular tabs in one step, I wonder if a similar annotation could show new users about the other TST additions/addons?

BTW- Maybe the Close 'Tree Style Tab' button should be a collapse icon (<) instead of (X), because that symbolises a non-reversible closing action to me.
(Version 3.4.8)

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A mandatory Add-on for me. Was better before Quantum update of firefox but with CSS edits you can get some functionality back.

I’ve come to rely on this so much that I don’t even know how people live without it.

Absolutely essential. The lack of anything like this on that other browser makes it impossible for me to consider switching, ever. (No, that tabs in a separate window thing is not near good enough.)

best onthe market, it make me cant migrate from ff to another browser...
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(2) Close button on tab doesn't work with latest (3.4.1) version.