If you are facing the issue Firefox won't open on Mac, then you must check for updates. To update the latest version of Mac, you need to select “System Preferences” and then click on the option of “Software Update”. Now, carry out the commands on the screen to update MacOS. In order to update Firefox, go to the menu bar and then select Firefox. After that, choose the option of “About Firefox”. This will inform you if the app is updated or not. If an update is available, then it will get installed automatically. You can also update Firefox by selecting Firefox. After that, go to Preferences, General and then click on Update.
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