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Maybe your favourite browser is not in your own language or you want simply to change it. You can reinstall Firefox and select the package with the language you want. But this is not the best way.

This method can help you change any language from one to another in few seconds, like if you were just adding an extension.

First, go to the Mozilla Firefox’s FTP website : http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/

Navigate in folders by choosing your current version and your operating system.

Then, select the “xpi” folder within it.

You may need to know the abbreviation of your desired language. If you see multiple xpi results for your preferred language, identify the abbreviation of your region (see examples below).

Select the xpi file that corresponds to the language you want to install.

Click “Authorize” and “Install now”.

Type “about:config” in the address bar and change the value of “general.useragent.locale” with the abbreviation of your new language (“en”, “fr”, “es”, etc.).

You need to restart Firefox to see that the language has been changed !

• Firefox 21.0 in french : http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/21.0/linux-i686/xpi/fr.xpi
• Firefox 21.0 in spanish : http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/21.0/linux-i686/xpi/es-ES.xpi
• Firefox 21.0 in english (United States) : http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/21.0/linux-i686/xpi/en-US.xpi
• Firefox 21.0 in english (Great Britain) : http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/21.0/linux-i686/xpi/en-GB.xpi

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