Started OK, went well for a couple of days, then just disappeared! Re-installed, no show. Forget it, not worth the hassle!

low performance

This extension is incredibly useful. It stands out as one of the best I've ever used, and I've been online since the early days of the Internet. Excellent work, Max Badryzlov! Thank you so much, buddy!

Great!

mate, this add-on is more than an add-on. this should be integraded into firefox. it is much more superior in managing tabs than anything mozilla has made (e.g. firefoxs new vertical sidebar looks in comparison so halfhearted).
i just found out that i can customize the tab menu too (often to unload tabs).
i am really impressed with this masterpiece! thank you very much

Testei várias e essa, pra mim, foi a melhor. Intuitiva, organizada e com bastante opção de customização.

Best Tab Manager so far

This add-on is simply excellent!

I started using it for tabs organization (vertical, tree, groups) but found so many more related features that I did not know I needed!

I hope you can continue working and supporting this extension for...ever :)

Es ist zwar nur eine zusammenfassung aller offenen Tabs, abe das macht die App richtig gut! Danke

I'm a professional and power user (now 4K+ tabs opened).
I'm using Sidebery since 2020: with lateral tabs, grouping and panels, Sidebery changed my way of using the browser and it's great, organized and efficient.
Thank you so much!
P.s. Probably it's the main reason because I stay with Firefox.

Suggestion: in the years, it happened 2 or 3 times that it has lost the hierarchy of my tabs and flattened the list, so I've set Sidebery appropriate automatic snapshots and to avoid eventual bugs, if a version works without problems, I update Sidebery to a new release only after many weeks since it has been released.