hi, you could have a look at this addon which will make things easier: https://addons.mozilla.org/firefox/addon/simple-locale-switcher/

Note that you need to close and restart Firefox to change the language of the user interface, you can't do that on the fly. You can create a desktop shortcut with the "-UILocale xx-xx" switch appended to the command line to start Firefox with a specific locale. Start > Run: firefox.exe -UILocale en-US *https://developer.mozilla.org/Command_Line_Options You can find language packs here: *https://addons.mozilla.org/firefox/language-tools/ * http://download.cdn.mozilla.net/pub/mozilla.org/firefox/releases/latest/win32/xpi/