How to change web browser language settings in Mozilla Firefox

1. Open Mozilla Firefox
2. Click the Firefox Button at the top-left of your browser window (older versions click the Tools menu) and click on the Options menu item
   
   
   
3. The Options window will now be open
   
4. Click on the Content icon at the top of the Option window
5. Under the Languages heading, click the Choose button
   
   
6. You should now see your current language(s) in order of preference from top to bottom
7. To add a language: click the Select a language to add.. drop-down list button, Select a language, and click the Add button
   
8. To change the order of preferred language(s): Select a language, then click the Move Up or Move Down buttons to change the order
   
9. To remove a language: Select the language and click the Remove button
10. When you have finished choosing your languages, click on OK to Languages window, then OK to the Options window
11. Now refresh the webpage (preferably Google.com) to see your language preferences working.