Hello,

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: This will cause you to lose any Extensions and some Preferences.

• Open websites will not be saved in Firefox versions lower than 25.

To Reset Firefox do the following:

For Firefox versions previous to 29.0:

1. Go to Firefox > Help > Troubleshooting Information.
2. Click the "Reset Firefox" button.
3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
4. Firefox will open with all factory defaults applied.

For Firefox 29.0 and above:

1. Click the menu button , click help and select Troubleshooting Information.Now, a new tab containing your troubleshooting information should open.
2. At the top right corner of the page, you should see a button that says "Reset Firefox". Click on it.
3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
4. Firefox will open with all factory defaults applied.

Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

Thank you.

Thanks! This seemed to resolve the issue!

Odd that it was only occuring in the newest version.

Hi, here is another solution that doesn't require the Reset Firefox feature. Basically we want to Delete or Distrust the "problematic" certificates from the Authorities:

1. Go to Firefox Menu > Options
2. Go to Advanced tab >Certificates > View Certificates
3. Go to Authorities tab on the Certificate Manager dialog and look for the Certificate Name (In my case it is an IP number, grouped by the company that issued it)
4. Select all the "problematic" certificates (it might have more than one for the same site) and click on Delete or Distrust and confirm. Here is important to make sure no "problematic" certificate is left there.

Once you followed these steps, close the options dialogs and just access the site with untrusted certificates again and Add Exception to trust the self-signed certificate.

OBS: this fix works for OSX and Windows 7.

You can also rename the cert8.db file in the Firefox profile folder to cert8.db.old or delete the cert8.db file to remove intermediate certificates that Firefox has stored.

If that helped to solve the problem then you can remove the renamed cert8.db.old file. Otherwise you can rename (or copy) the cert8.db.old file to cert8.db to restore the previous intermediate certificates. Firefox will automatically store intermediate certificates when you visit websites that send such a certificate.

You can use this button to go to the currently used Firefox profile folder:

• Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)