User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:31.0) Gecko/20100101 Firefox/31.0 (Beta/Release) Build ID: 20140715215003 Steps to reproduce: Just begin making a post (for me usually Imgur) and see everything marked misspelled. My spelling checker thinks I want Cuban Spanish. Set it to USA English. Gets set back to Cuban Spanish sometimes even for the very next comment. This happens on it's own - I don't know how to trigger it. Actual results: Spelling language gets changed at random times. Expected results: It should keep my selected spelling language until I change it.
I have found information that seems to say I have to set my spelling language while on my home page. I have done this. It did not help.
Go to Tools > Options > Content > Languages and remove the language entries you don't need.
The only item there is "English/United States [EN-US]" "Preferred language for displaying pages"