Switched to Sidebery from Tree Tabs, definitely better, especially regarding performance. I have 300+ tabs, since I switched to Sidebery, Firefox's RAM usage is half.
https://support.mozilla.org/en-US/questions/1396277
Sidebery solved that successfully.

The only option I miss is unloading tabs/pages upon a predefined time interval. I'd set it to 1 week.

Tab Management 5.0. Best Tab Organizer. Must have! I have tried various and this is best in stability and functionality.

I was a user of TST, but it's full of unfixed bugs and a ressource hog. SireBery solves ALL the issues I had with TST ! Amazing !

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the best addon I have ever had. I can't imagine a web browser without this

This add-on has help me become more organized while browsing the web.
A nice extension to have for increased productivity.

The surface level of this plugin doesn't even begin to explain its functionality. This takes features we know from Opera, Safari, Edge, and just spices them all up. Tab management is THE biggest reason I choose a browser. However, once I saw this plugin I said screw Opera and Safari. This solution is seriously perfect, and browsers should pay this man for the functionality is were up to me.

It does SO much and it's like they almost thought of everything. They probably have within the bounds of a plugin I'm sure.

Only feature request? Somehow HIDE the original tab bar entirely. I wish FF came with that functionality already, and they should considering all the tab management solutions, frankly.

Cheers to you guys for offering this for free. Incredible.