All typed text appears blue until I press space.
All typed text appears blue until you break it in some ways like pressing the spacebar or moving the keyboard cursor with the arrow keys. It happens at the firefox search bar as well, and search suggestions and autocomplete doesn't work whenever it happens.
Izabrano rješenje
The problem was not because of firefox, but a custom IME that had been installed with a 3rd party word processing program commonly used in Korea. You can see this on the lower right corner of the screenshot.
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This problem fixed itself for no appparent reason, and now it doesn't happens again. I mashed the keyboard and suddenly the words became weirdly spaced out. I restarted the computer and both of the problems dissappeared. The original problem didn't fix itself after a system restart, and the restart was effective only after the second bug happened.
Odabrano rješenje
The problem was not because of firefox, but a custom IME that had been installed with a 3rd party word processing program commonly used in Korea. You can see this on the lower right corner of the screenshot.