So, I wrote a negative review yesterday (which I've now deleted), but it appears that the Wikiwand add-on was updated yesterday and it's now working again. Yay! The AI Tools block on the right can be minimised and an ad blocker takes care of ads, but I may just upgrade to a paid version anyway since I use Wikipedia a lot and WIkiwand (pro) is very reasonably priced and supports the existing and ongoing development efforts of a great add-on. FWIW, I think it's worth it to get a much better reading experience than ordinary Wikipedia for frequent users.