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.

Learn More

I downloaded version 4.0.1 and it crashed my system- my Norton no longer works and Firefox browser won't open. I did system restore which did not fix it. I tried downloading 4.0.1 again, it freezes when it tries to open "Checking add-on compatibility".

  • 1 balasan
  • 4 ada masalah ini
  • 1 paparan
  • Balasan terakhir oleh Elka29

more options

I downloaded version 4.0.1 and it crashed my system, my Norton no longer works and the Mozilla Firefox browser won't open. I did a system restore, which did not fix it. I tried downloading 4.0.1 again, it freezes when it tries to open "Checking add-on compatibility". What the heck is going on??

I downloaded version 4.0.1 and it crashed my system, my Norton no longer works and the Mozilla Firefox browser won't open. I did a system restore, which did not fix it. I tried downloading 4.0.1 again, it freezes when it tries to open "Checking add-on compatibility". What the heck is going on??

All Replies (1)

more options

When I downloaded new stupid version causing crash my system My Norton gone after 4 h struggling finally I got it back but only protection I lost my identity safe data witch is very important for me my password can not be verify and I can not fix it I'm so mad I want old version back