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firefox 6.0.2 hangs with "Error Code: sec_error_expired_certificate" on OSX 10.6.8.


OSX 10.6.8 Intel Mac Firefox 6.0.2 Error box appears: xml.freecause.com:443 uses an invalid security certificate The certificate expired on 9/24/11 5:59 PM. The current time is 9/24/11 6:45 PM (Error code: sec_error_expired_certificate)

Unable to "Cancel" because error box reappears continually. All drop-down menu selections disappear except for Firefox. Can select preferences from this lone menu item and cleared cache and recent history with no avail. Quit and restart with same problem with only a mozilla website tab.

communicating using Safari

Additional System Details

This happened

Every time Firefox opened

This started when...

viewing financial website

Installed Plug-ins

Adblock Plus Cool Previews Mileage Plus shopping toolbar Clipmarks


  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.50 (KHTML, like Gecko) Version/5.1 Safari/534.50

More Information

Cannot get to this info due to above problem.

  • Top 10 Contributor
  • Moderator
3195 solutions 24387 answers

Probably caused by a Firefox extension which is related to "air miles" tracking. Disable that extension until that server certificate error is fixed.



wide_awake 15 solutions 55 answers

Try disabling all your addons, then enable them one by one to find out which one is causing this problem.

kmuzikar 0 solutions 5 answers

Helpful Reply

I had this problem too...for me it was caused by theGamers Unite snagbar that I had installed. For some people it was yahoo. I found a solution here: https://support.mozilla.com/en-US/questions/879011#answer-250883 wherein I changed my computer's date to two days ago (before the certificate expired) opened up Firefox (with no issue!) and uninstalled the toolbar. I closed Firefox, updated the date back to the correct date, and opened Firefox. Seems to have worked, I haven't had the error window pop up since.

Disenchanted 0 solutions 1 answers

Helpful Reply

Correct your date on the bottom right then it should fix the problem  :D