This extension totally changes the browser workflow. If you have 300 tabs open, it's a must have!
Best together with some userChrome.css tweaks.
No other browser and extension come close.

хорошее приложение и что поражает имеет 25 млн настроек. что я пока читал на четверти уже устал и уснул ахахаха. При это всё переведено на русский. Даже не представляю как еще можно сделать это расширение лучше

Really like this extension. I have just one request: please add the option to create a new tab + when hovering over a group (folder) we have created, while keeping it colour setting. I know it can be made by clicking on the group heading in the page that way, but my suggestion would be a nice bonus! thanks for this extension very much!

This fixes so many little nitpicks and inconveniences I have in my daily use of Firefox!

I usually have hundreds of Tabs open in sometimes more than 10 windows.

Now I can have one window with multiple panels, each categorised and it is so simple to move multiple tabs between them.

I love the vertical tabs that Firefox added natively, but they can not as easily be sorted and you cant even have the newest one appear on top.
Now I can!

Amazing add-on!
I hope it keeps on going for a very long time <3

I stopped using Zen browser. The extension works better now.

It turned the entire structure—which I had spent so long building—into mush.

Hello.

When I enable Sidebery, if I try to use two or more “X” accounts in separate containers within Firefox's container tabs—specifically on the social media platform ‘X’—I lose access to “X” the moment I enable Sidebery.

It is unclear whether this is specific to the social media platform “X” or if it happens whenever you try to use two different IDs under the same domain in container tabs, but at least with “X,” attempting to open it in a specified container results in a loop where it keeps opening in the @*** container (where *** is the X username), preventing it from opening in the container tab.

If you turn Sidebery OFF, it won’t get stuck in a loop opening in the @*** container, and you’ll be able to open it in the specified container.

Firefox 151..2
Sidebery 5.5.2

Excellent add-on!
I could uninstall the add-ons for:
counting tabs,
session backup,
searching tabs,
multiple tab handling.
And I could customize the settings to my liking by GUI and CSS.