Unusuable. There are no instructions of any kind. The UI is not any standard kind. Everything is hidden behind some inscrutable icon. All I want is a way to say "block this page", or to add a URL to a block list, but despite the vast multitude of icons and menus leading down endless rabbitholes, there are no options to block this page, or to add a URL to a block list, that I can find. Neither is there any provided blocklist, or info on where to find a good blocklist. This is possibly the worst user interface I've ever seen in nearly 50 years of using computers every day. It's like it was made by ancient Egyptians.