Сойдёт но немного неуклюжее.
Имеются баги!

More powerful than any competitor, but doesn't adhere to the colouration of the system as well as addons.mozilla.org/firefox/addon/tree-style-tab does, per github.com/mbnuqw/sidebery/issues/952#issue-1592410166.

Great so far, but why can't I use the command key for keyboard shortcuts?

Absolutely wonderful and should come stock with every browser! However, I would really like to see a search function implemented so that I can quickly and easily find a specific tab in a window (If this option exists then I could not find it)

ok

1-there is no search box
2-there is no tabs scrollbar
1+rich functions and settings!

If the autohide/autoexpand functionality worked while the sidebar is hidden this would have the exact functionality I want. It wouldn't hurt to have an easier way to theme the appearance, either.

Smoother than Tree Syle Tab, but lacks many of it's additional plugins that expand it's functionality, also i'm surprised i found no option to restore Tree order when i restore parent Tab, i TST restored parent tab get placed above it's children like nothing has happened, in Sidebery i need to reorder them again. Is that a bug?

"Dieses Add-On ist ausgezeichnet. Für meinen Anwendungsfall sind Webbrowser ohne so etwas grundsätzlich unbrauchbar. Ich war jahrelang auf der Suche nach so etwas, das tatsächlich gut funktioniert, mit vielen Enttäuschungen auf dem Weg. Es gibt mehrere Add-Ons zum Organisieren von vertikalen Registerkarten, aber dies war bei weitem das stabilste für mich. Ich hatte einige Fälle, in denen Tab-Gruppen verloren gingen, aber das Einstellungsmenü enthält einen Vorschlag zur Behebung dieses Problems (unter „Wo Tabs gespeichert werden“), was bei mir funktioniert zu haben scheint. Es sieht auch gut aus, funktioniert gut und hat viele anpassbare Optionen. Ein Vorschlag ist, die Option zu haben, die Registerkartengruppennamen neben oder als Alternative zu den Symbolen anzuzeigen. Vielleicht übersehe ich diese Option irgendwo.,,

Feels nicer than Tree Style Tab and lets you turn off tree mode, which I find leads to tabs piling up and being forgotten.

My main issue is that it often moves all your tabs back to the default panel on startup. From GitHub it seems this is a known issue at least.

This extension allowed me to finally come back to Firefox after using some forks of older versions.
Truly excellent in that ability to have different tab panels with vertical tree tabs in them. Each panel is a different category. So much easier to keep organized and track of the tabs.
The only thing I miss from Tab Kit 2 is being able to color a tree parent and all child tabs of that tree one color to easily see those relationships at a glance.

I'm taking off one star because I have yet to find a compatible session manager that retains the tree and group structure.
This does not allow saving sessions (the snapshot feature auto-deletes as new ones are created, EVEN manually initiated snapshots get auto-deleted).