On Mac OS, do it from within Safari, as explained in [[Setting Firefox as the default browser does not work - What to do |this article]]: # From the Dock, open '''Safari'''. # From the menu bar, click the ''Safari'' menu and select ''Preferences...''. # Click the ''General'' icon, to display the General preferences panel. # In the '''Default web browser:''' drop-down list, change '''Firefox''' to another browser.<br/> <br/> [[Image:113f7b1b820e1b71faeb5aa77e042443-1259803440-200-1.jpg]] <br/> # Quit Safari.