How to determine the version of Firefox that you are running
Mac
- Select the Firefox menu, then "About Firefox."
- In the display window, the version will appear below the word Firefox
Windows
Newer versions of Firefox
- Click the Menu button in the top right corner
- Select the Help option at the bottom of the menu that appears - this is denoted by a question mark
- Select "About Firefox"
- A dialogue box will appear and the version number will be located underneath the word Firefox