Mozilla Firefox (Version 32.0.3)

Mozilla Firefox (Version 32.0.3)

1. 
   Select ‘Open Menu’
   

2. 
   Select ‘Open options’
   

3. 
   Select the ‘Content’ tab then under the languages section press ‘choose’
   

4. 
   Via the menu, press the ‘select a language to add’ and choose ‘English (United Kingdom)
   

5. 
   Press ‘OK’
   

6. 
   Press ‘OK’
   

7. 
   Close all Firefox sessions.
   
8. 
   The next time Mozilla Firefox opens, the language preference should be English (United Kingdom) and the date format will be UK.