This extension slow down your browser/crash. In pages who is already "dark mode" it will break the page making is frustrating. Isnt intuitive IMO. But the last straw was the addon changed my dark toolbar to grayish and white (when addon is disabled) and didnt saved my previous toolbar (I clicked to check what the function did). Oh well, to much hassle for now. I can see it having potential to be a great extension but for now I wouldnt recommend it.

Edit: 1 month later after disabling it I still have issues. I wish I never had this installed. I would understand something Ive downloaded outside the official addon page screw with my browser. But for an "official" and recommended extension I cant stay quiet and do nothing.