There's some sort of jumping the shark that happens with user interfaces, that drives me nuts. Case in point: the UX of history and bookmarks in all major browsers seems to have gone to hell in the last 5 to 10 years. Pretty much these days whenever I go try to find something I was literally just reading, just closed, it doesn't appear in the list and I have to hunt around for it. What the hell? And then similarly with bookmarks, now there are like at least 3 different 'places' in Firefox I can accidentally save a bookmark so that I can never find it again (Bookmarks Menu, Bookmarks Toolbar, Other Bookmarks).