Change default language on Firefox [closed]

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I've been looking forever for a way to change the default language on Firefox (Ubuntu 12.04). Nothing I did worked, until I just figured it out now. (see my own answer below)

Does anybody know a better way to do it?

Answer 1

1. Go to your language folder of firefox. For me it is usr/lib/firefox/dictionaries.
2. Note if it is a shortcut, for me it shortcutted to ../../share/hunspell (/usr/share/hunspell)
3. Backup the folder somewhere (copy paste it)
4. Go to that folder and DELETE everything other than the language you want. (for me I kept only en_US*)

This obviously only works if you don't want the other languages. After months of trying to solve this bug, I couldn't come up with any other way. Hopefully Mozilla fixes this bug soon...

Here's the command lines

user@user-1015E:/usr/share/hunspell$ sudo rm en_A*
user@user-1015E:/usr/share/hunspell$ sudo rm en_C*
user@user-1015E:/usr/share/hunspell$ sudo rm en_Z*
user@user-1015E:/usr/share/hunspell$ sudo rm en_G*

Answer 2

I was able to set the default spellchecker by going to about:config and setting spellchecker.dictionary.

Answer 3

It think the underlying problem is that when you use system wide spell check dictionaries only (and no dictionaries as a plugin) Firefox does not remember your default settings (is this a bug?). You need to have at least one dictionary installed as a Firefox plugin.