Firefox tab groups persist across browser restarts (or at least mine have for ~5 months now). I haven't had any issues with new windows yet either though I have definitely lost Firefox tabs to that issue in the past.
I agree though, Chrome does a similar implementation where tab groups act like a special class of bookmarks and it's much nicer. You have the same process where you never have to fear losing groups and you can 'hide' tab groups that you aren't actively using and they're potentially accessible from any window.
I agree though, Chrome does a similar implementation where tab groups act like a special class of bookmarks and it's much nicer. You have the same process where you never have to fear losing groups and you can 'hide' tab groups that you aren't actively using and they're potentially accessible from any window.