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Firefox 50.0 + Mac + United States-International PC keyboard layout
I noticed a bug with apostrophes on my OS X El Capitan. When I try to type a word like "don't" Firefox shows "don'" and ignores the press of the T key.
Worth to mention I use the "United States-International PC" keyboard layout because I use Latin characters like áàéíóú in my language.
It means that when I need to type a word like "café" I have to type c-a-f-'-e and the OS will automatically knows I want to type "é".
In any other browser or app, when I write "don't" it knows I'm typing an apostrophe and when I type "café" it knows I'm typing an acute accent. But not in Firefox.
If I use the keyboard layout "United States" (not international), the apostrophe works normally.
I tried removing language packs, dictionaries and disabling spelling and nothing worked. I ran Firefox in safe mode (add-ons disabled) and the problem still happens. Looks like it's an incompatibility between Firefox 50 and United States-International PC keyboard layout. I don' know if it happens in Windows or Linux.