• Open the Mozilla Firefox browser.

  • Click the Menu icon in the upper-left corner of the browser window.

  • Select Options from the drop-down menu that appears.

  • Under the Languages and Appearance section click the Choose button.

  • In the window, click the arrow on the right side of the box (A) that says Select a language to add and then click the Add button (B).

  • Click the newly selected language (A) and then click the OK button (B).

  • You'll see the new language when you restart your browser.