[gorbachev]

I do the same. I think I have about 50 different tab groups using Simple Tab Groups.

I wouldn't call it working without a hitch. It's not crashing often, but it does occasionally, usually associated with a Firefox update. There's something wrong with the way either that addon, or Firefox itself, manages updates that have been recently applied. I've started making sure I make a backup of my tabs before Firefox does any updates, because it's almost certainty something goes wrong.

Usually I just need to restart Firefox and nothing else, but sometimes Simple Tab Groups has also lost the containers I'm using. That is a real pain in the ass to recover from.

[deepspace]

Mine is set to back up automatically every day, but I never had to restore, touch wood. Occasionally the icons go wonky until the next restart, but that's the only issue I've beer seen.