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Change the language

In general, to change the language you have two choices: the Locale Switcher add-on and the UILocale parameter.

The effect on the general.useragent.locale configuration preference (to see the preference value, open about:config in Firefox) is important for the interaction between Firefox and the Mozilla servers (See the Bugs section for the details).

The table below contains the values of the preference in the Italian and in the English version of Firefox (as an example).

Condition	Italian	English
Without the langpack (default value)	it	en-US
Langpack installed and locale changed using Locale Switcher	roa-IT-ins	roa-IT-ins
Langpack installed and locale changed using UILocale	it	en-US

 

Locale Switcher

This add-on is the simplest way to change the GUI language.

1. Install Locale Switcher and restart Firefox.
2. Choose Tools > Languages (or the equivalent commands in your language) and click on roa-IT-ins. (Currently we can't show a text different from the language code.)
3. Restart Firefox to see the language change. (To go back to the Italian language, choose Strüment > Lenguf and click on the name of the original language.)

UILocale

To change the GUI language, you can start the Firefox executable with the UILocale parameter and the language code, roa-IT-ins. The command to start Firefox is:

firefox -UILocale roa-IT-ins

Above, firefox is the executable or the script starting Firefox, and it should be in the path of your system if you want to write it that way.