Hello! If you have two versions of Firefox on your computer, '''uninstall''' one of them. If you have two versions of Firefox because you want to have a separate browser for another user of the computer, I recommend that you '''create a profile''' within one of Firefox. Create a profile by '''clicking the three lines on the task bar''', then '''Profiles'''. '''Click New Profile''', give it a name and icon, and click OK. I hope this helps. Vexi