This addon is fantastic! Firefox's newest update did mess with it a bit, but the Onetab team quickly fixed the issue and now it's working again perfectly! You just have to update OneTab andeverything should work, with no data lost! The Onetab team responded quickly to my support request and I'm very impressed by their dedication. This addon is so so nice and I wouldn't be able to enjoy the internet without it.

Update 2/18/2021--I still love this add on so much! If I didn't have it i simply would not be able to function on the internet without it!