Hi gangski, In order to download a certificate the server either would have to issue you one when one is required, or you can create a self signed certificate. In order to install a certificate, there are a few ways to manage them. # Please open up the Firefox Options/Preferences # and select the "Advanced" section # and select "Certificates" # Click "View Certificates" # Click Import... and select the certificate Other ways to manage certificates is to use tools: *[https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/Reference/NSS_tools_:_certutil]