To install the second language version, download the installer from http://www.mozilla.com/en-US/firefox/all.html To install it you need to use the [[custom installation of Firefox on Windows]], and choose a different destination folder. You should also create different user profiles for the two versions (profiles store user data and settings). To do that see the following http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows You also need to create shortcuts for each version that load the correct profile, for details see http://kb.mozillazine.org/Shortcut_to_a_specific_profile ------------------------------------------------------------------------------ If you want the Brazilian Portuguese version there is another way to do this. There are language packs that can be added to Firefox, but for Portuguese only the Brazilian Portuguese language pack available. You can install the Brazilian Portuguese language pack onto the English version of Firefox, it is available from https://addons.mozilla.org/en-US/firefox/language-tools/ Now install the [https://addons.mozilla.org/en-US/firefox/addon/1333/ Quick Locale Switcher] add-on to enable you to switch between the two language versions.

http://releases.mozilla.org/pub/mozilla.org/firefox/releases/3.6.8/win32/xpi/

http://kb.mozillazine.org/Language_packs

You can find all language packs here: http://releases.mozilla.org/pub/mozilla.org/firefox/releases/3.6.8/win32/xpi/ See also: http://kb.mozillazine.org/Language_packs