After rebooting computer - all settings gone

the best was "All-in-one sidebar"

Не вижу смысла в этом аддоне, так как он не скрывает стандартную панель браузера со страницами

Tried it as I saw it suggested. Tree Style Tab user here, but it's not possible to middle click to close a group of tabs. Maybe if this is implemented I might try again. It feels like this extension maybe tries to do too much?

I only used for about an hour, so maybe that's why?

Totally unusable. It just eats my tabs, and assumes WAY too much about my workflow. A way to turn off the panel stuff would be appreciated—that's what hierarchical tabs are for!

Groups are, just, I mean, *what*? I don't get it. You have to select multiple tabs just to create a folder? This is unprecedented in the history of computers. Even file compression tools let you create empty archives.