I trashed everything I could with a Firefox name but no improvement. I have been told Firefox is open but I could not locate where the this Application was on my Mac. I have been able to understand a little more about the Macintosh system as against Windows XP. Firefox will not close I have solved my problem.Common issues with Firefox on Mac and how to fix them. Get your Firefox to perform as it should with Setapp's guide to troubleshooting the most popular issues.