https://twitter.com/BrendanEich/status/1217512049716035584/p...
https://twitter.com/BrendanEich/status/1217512049716035584/p...
For example just look at the alert popups[0], or the non native contextual menus, or the video pop icon. The UI is full of little quirks like that. The tab bar is by far the ugliest one of all current browsers, at least on macOS.
It also misses important features such as multilingual spell checking. For people writing in multiple languages it's a real PITA. I know this functionality can be added with an extension but it slows down FF too much IMO.
It's horrible on all platforms ;) . The way tabs are handled is by far my biggest complaint, you can't fit as many tabs in as with chrome and since they "upgraded" the extension system the vertical tab extensions don't work well (can't remove top tab panel).
I wish they'd just make a native UI for each platform, their cross platform one has always been a train wreck but it's especially bad since they dropped XUL.