Firefox problem Untrusted site

Problem
I have a problem with my firefox.  Every time I go to facebook I get the Untrusted site screen.

Solution1

Delete cert8.db

1.  Click

2.  Click Help "?"

3.  Choose troubleshooting information
4.  At "Application Basics" click "show folder"
5.  Close firefox
6.  Look for cert8.db and delete it.

Solution 2

Check your internal clock

1.  Check cmos clock if working
2.  If not replace the battery.
3.  Input correct time
4.  Boot windows
5.  Check if facebook will connect at firefox

Solution 3

Update mozilla firefox.

Reference
https://support.mozilla.org/en-US/kb/connection-untrusted-error-message