Totally ruined YouTube and a few other websites. Tried to turn it off. It didn't. Uninstalled it, it still left the dark theme applied. A bad choice, unfortunately. I will reinstall it just to see if I can bring back the websites to default then I'm uninstalling it as quickly as I can. Sorry but I have to.

Very useful!
I wish there was also the option of grouping tabs by current domain, which would be very useful in websites like Amazon rather than Artstation or any other website with products or items' profiles opening in new tabs.