Brendan Eich has a helpful chart of Compensation of Highest paid executive at Mozilla vs Firefox market share over time.
https://twitter.com/BrendanEich/status/1217512049716035584/p...
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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.
The English spell checking is pretty bad, too, giving me at least an order of magnitude more false positives [1] than Safari or Chrome on my Mac, and Edge or Chrome on Windows. Same when compared to things other than browsers, such as Word, LibreOffice, BBEdit, Pages.
What's baffling is that Firefox, LibreOffice, and Chrome all use Hunspell [2], so presumably the reason Firefox spell check sucks compared to LibreOffice is they have a terrible dictionary.
So why doesn't Mozilla just take the LibreOffice dictionary?
[1] In case I've got the terminology wrong for spell checkers, by false positive I mean where the spell checker says that a word is spelled wrong when it is in fact spelled correctly.