Every now and again (sometimes after a software update) my Brave Dev browser loses its tab groups on restore. It always restores the 48+ open tabs, but my tabs are in Tab Groups, so I can collapse what I'm not busy with. This loss of the groups can be very irritating, and so far I had just not seen any extension that solves this, and none of the browsers seem to restore the groups.
Tabox though is saving the open tabs, along with groups (names and colours), and saves this locally on your drive. It has a sync feature too with Google Drive (optional), that will sync to your own GDrive (and not a third party site). I have a collection named for each browser I have open, and both named sessions show up in the cloud sync.
It will work on Chrome, Edge, Chromium, Brave, and should work too with Vivaldi and other Chromium based browsers.