Removing Burp's CA Certificate from Firefox

InstallingandConfiguring_RemovingCACertificate_FF_1

In Firefox open the Firefox Menu.

Click on “Preferences”, then select the “Advanced” tab.

Select the “Certificates" tab and click “View Certificates”.

Select the “Authorities” tab.

 
InstallingandConfiguring_RemovingCACertificate_FF_2

From the list of Certificate Names, scroll down and select the "PortSwigger CA" entry in the list (this is a sub-entry under PortSwigger). The entry should now be highlighted.

Click "Delete or Distrust".

Click "OK" in the confirmation dialog.

Confirm that the "PortSwigger CA" entry has been removed.

Restart Firefox.