I restart the browser often. seems to be the only reliable way to free up all the resources it uses and prevent crashes. That does update the browser, I’m on 104.0.4 so I get to enjoy stuff I didn’t ask, changing and the occasional thing breaking. At some point I’ll choose a version I like and freeze it in place and prevent it from updating entirely.

I also have an addon to merge all windows and another to order all tabs by their domain name.

Once in a while I’ll dump everything into book marks (and never open them again, since bookmark are basically impossible to effectively search).

I tried “tab stash” and just ended up losing hundreds of “hidden” tabs, it didn’t lighten organizational load, it was just something to manage on top of it all.

For browser sync, I still use firefox sync, the best I can say about it is that it works, however, there are no want to actually search the content in the sync database. So it’s only for sharing tabs between devices and backup the tabs and bookmarks.