I think this happens when you do not have any dictionary installed as a Firefox plugin. When I was only relying on the system wide spell checker (hunspell in my case) the default language selection of the spell checker always was always wrong (notice that now you do not have dictionary tab in the add-on settings page). Since I write in Dutch, French, Danish and English, this was a real pain. When I installed one dictionary as a Firefox plugin, the default language selection worked as expected.
For the record, this is also mentioned on StackExchange (http://stackoverflow.com/questions/26936792/change-firefox-spell-check- default-language/29446115, http://stackoverflow.com/questions/21542515 /change-default-language-on-firefox/29446353, http://askubuntu.com/questions/50049/how-to-use-american-english- spelling-dictionary-in-firefox), and the Arch Linux Wiki (https://wiki.archlinux.org/index.php/Firefox#Firefox_doesn.27t_remember_default_spell_check_language). -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1026869 Title: Firefox accepts dictionaries and spell check entries from every which spell check backend, leaving problems with defaults and the language selector enables this behavior Status in The Mozilla Firefox Browser: New Status in Hunspell: New Status in MySpell: New Status in firefox package in Ubuntu: Confirmed Status in language-selector package in Ubuntu: Confirmed Bug description: I've been searching for the solution to this bug for a long time. Firefox's spell-check, despite my locale being en-US, sets itself to en-GB, en-ZA or something en_US, which isn't even correct. The problem, it seems, is that Firefox uses whatever spell-checking backends you have installed - aspell, myspell, and hunspell. The result is that Firefox chooses, en-GB as the default spell checker more-often than not. So I uninstalled myspell, hunspell, and a package called firefox-locale-en and now everything is correct - only one spell checker is installed in Firefox. The language selector, however, always prompts to reinstall these backends whenever it is loaded. This Firefox add-on can assist, it gives you a list of dictionaries installed: https://addons.mozilla.org/en-US/firefox/addon/dictionary- switcher/ To manage notifications about this bug go to: https://bugs.launchpad.net/firefox/+bug/1026869/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp