>TreeStyle Tabs is the the Main reason I use FF today. I dont understand why browsers have tabs horizontally across the window, it looks stupid and is unusable once you get above 20 or 30 tabs open So you talk about have 100's of tabs open, it is pointless if I do not have TreeStyle or some kind of Vertical Tabs.I don't see why people like vertical/tree-style tabs. To me it's always seemed extremely messy. Tab groups, searching, and a scrollable context menu at any mouse position, to me, is a much smoother and faster workflow.
Ctrl+Shift+E opens up tab groups and I can begin typing to search. When both my hands are already on the keyboard, this is most convenient [0]. When my hand is already on my mouse, however, I can right click and scroll to open up a context menu of all tabs within my Tab Group [1]. I also have a mouse gesture for opening Tab Groups so that I can switch groups if necessary. I frequently have 300+ tabs open, organized into tab groups of 20-40 related tabs (mostly research/tutorials/google docs for various MMOs I play)
I was actually frozen at FF44 until the Tab Groups add-on functioned properly. And I'll likely be frozen at FF57 [2]. Sadly, my way of tab management never seemed to catch on and the add-ons that enable it soon won't be supported.
For those interested in my tab management, I use Tab Groups and Fire Gestures (almost entirely for the '[Popup] List All Tabs' feature). I bind List All Tabs to both scrolling up and scrolling down, as scrolling up is originally Tab History.
[0] https://my.mixtape.moe/tukpwo.webm
[1] https://my.mixtape.moe/gqlawp.webm
[2] http://fasezero.com/lastnotice.html