Правила прокси для контейнеров не работают.
А главное - когда включено скрытие вкладок неактивных панелей, при переключении панелей с сотнями вкладок потребление оперативной памяти нарастает безлимитно , пока браузер ( а то и вся система ) не падает из-за недостатка памяти и подкачки

Easily the best vertical tab manager. Nested tabs, tab re-titling, automatic tab sleeping, tab groups, settings syncing between devices, the list goes on. This almost single-handedly makes Firefox my go-to browser. Keep up the amazing work!

Please implement

Automatic groups, for example by domain

To close tabs when selecting multiple

Ability to place a new tab button in the top bar

And show an interactive animation line at the bottom of the tabs when loading

By far the most polished sidebar tabs extension. Make sure to use the userChrome.css dynamic hiding rules when installing it.

Excellent software like this is rare. The priceless value add it brings to my browsing experience aside, the ui, ux, performance, feature set, vision is excellent top to bottom. Someone needs to award this guy.

it's so, so good.

Best thing since sliced bread. I had been using a similar add on for years until recently, Sidebery does everything that it did plus lots more really useful things. Really helps my workflow. Excellent. One slight niggle is that recently it has been randomly moving existing tabs to new windows, seems to be triggered by some browser event but I can't figure out what it is yet.

Flexible, cool customization, and yes, I only recently realized the niceties of saving/restoring the panel to bookmarks. Author, you're really good, thanks!

p.s. Why autosnapshots don't save cached tabs?

I've been using this extension for years now and I gotta say, it's simply the best extension I've ever used. So much software these days is create by UX people that want you to use things a very specific way and if that doesn't fit with your use case/personality, well then you're using it all wrong. Sidebery is the complete opposite, it has a wealth of configuration options that really help you fine tune the experience to get just want you want. For me I really don't like the tree structure options, but I assume many other love it, and with a couple quick option changes both me and those users can be happy.