Every time I start Firefox, the language is set to UK English. I live in the US and the spell checker flags words that are spelled right for the US, but if I make a typo and use the UK spelling, it passes that (and I sometimes miss the typo). I change the setting to US English and it's fine until I reboot the computer, then I have to do it all again. I admit this is a very minor problem, but it is really frustrating at times - I count on my spell checker because I do make a lot of typos and it helps to catch them (strange neurological condition I won't go into - kind of like dyslexia in the fingers). Is there some way to FORCE Firefox to start in US English every time? Some line I could add to the about:config for instance? OS: Linux Ubuntu 14.04LTS Using Gnome (old style) desktop only, Firefox 39.03, I usually have Thunderbird 31.8 and OpenOffice 4.1 all open at the same time, on dual monitors.