Great extension, probably the only one I found that had enough options to organize all my 500+ tabs and finally close them, while being able to archive them into a backup file, which I can still restore later on.
The behavior of "hiding tabs" when you add them into a group is a bit counter-intuitive at first, but you get used to it, and besides it's not really what I'm using the extension for, and I guess this saves memory.

An overall very polished add-on. Excellent work, and thank you !