Tuesday, May 20, 2014

Fix Firefox “The certificate is not trusted because it is self signed” error

I recently got rid of Google Chrome as my main browser. Multiple updates and frustrating features forced me to make the switch back to Firefox. While trying to log into a company website I was met with an error message that said “The certificate is not trusted because it is self signed” and there were no options to make an exclusion. Because of this I couldn't view the webpage in Firefox. Many others have reported this same issue since Mozilla's recent update to Firefox version 29. Here's the way to fix this problem.

1. Type about:config in the address bar. From the window that appears, find the following line “browser.xul.error_pages.enabled”. If the value from the same line is false, then double click it(it will turn to “true”).
2. Enter the URL of the webpage that you wanted again, a window will appear offering you the option of adding an exception that allows you to view the website.
Adding an exception can also be done manually, following the steps:
1. Go to “Tools” menu and then “Options” .
2. Click on “Advanced”, then tab “Encryption” .
3. Click on the “View Certificates” button.
4. Select the tab called “Servers” from the window that appears.
5. Click on the button “Add Exception” (bottom right).

You should now be able to go to your desired webpage and unlike Internet Explorer you won't be greeted with a warning every time.

Do this at your own risk. I don't suggest doing this for a standard internet site unless you know the risks. By allowing your browser to view an insecure webpage you may also open up your computer to malware and virus attacks.