This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Rohkem teavet

Browser will not open

  • 1 vastus
  • 1 on selline probleem
  • 1 view
  • Viimati vastas FredMcD

more options

Upgraded to MacOS 12.0.1 yesterday and cannot open Firefox browser even after deleting older version and downloading new version of Firefox. Is there a connection to the OS update? What is the solution?

Upgraded to MacOS 12.0.1 yesterday and cannot open Firefox browser even after deleting older version and downloading new version of Firefox. Is there a connection to the OS update? What is the solution?

All Replies (1)

more options

Some problems occur when your Internet security program was set to trust the previous version of Firefox, but no longer recognizes your updated version as trusted. Now how to fix the problem: To allow Firefox to connect to the Internet again;

  • Make sure your Internet security software is up-to-date (i.e. you are running the latest version).
  • Remove Firefox from your program's list of trusted or recognized programs. For detailed instructions, see

Configure firewalls so that Firefox can access the Internet. {web link}