You can find language packs here:

• http://download.cdn.mozilla.net/pub/mozilla.org/firefox/releases/latest/mac/xpi/

You can install language packs just you install an extension.

You can set general.useragent.locale to the language code of an installed language pack to select a language or use extension.

• Locale Switcher: https://addons.mozilla.org/firefox/addon/locale-switcher/
• Quick Locale Switcher: https://addons.mozilla.org/firefox/addon/quick-locale-switcher/

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

See also:

• https://developer.mozilla.org/Command_Line_Options
• http://kb.mozillazine.org/Language_packs

Hi,

  Thanks for the reply .

But The solution you provided is specific to windows OS. I have English Mac OS .Now I want to switch the locale to diiferent non english locales for i18n testing of my webbased product. For this i need language packs of Firefox and the procedure to apply those language packs on my Mac machine. Please tell me Mac OS specific procedure for this.

Thanks parshu

Sorry. I forgot to modify the link for Mac after pasting the URL.

• http://download.cdn.mozilla.net/pub/mozilla.org/firefox/releases/latest/mac/xpi/

The procedure is the same for all the platforms. You need to install the language pack. If you click the link then Firefox will ask for permission.

• https://support.mozilla.org/kb/extensions-add-features-to-firefox

Best is to use one of the extensions if you need to switch between languages frequently.

• https://addons.mozilla.org/firefox/addon/locale-switcher/