I have a cert.cer certificate file for my Mozilla Firefox. I don't have any clue how to go about installing it for my system. Any guidance would be of great help.
Go to the Firefox menu → Edit → Preferences
Click on the Advanced tab
Click on the Encryption tab below Advanced tab.
Click View certificates
In the Certificate manager window, Click on the Import button. Then locate the .cer file, and then click Open. The cert file will be imported.
Hope this will help.