By default Firefox has its own certificate store from well-know and trusted commercial Certificate Authorities. So today when I pushed out an internal self signed certificate; Firefox did not reconcile it as valid.

To correct this issue I did the following:

  • Launched Firefox
  • Opened the options panel and selected Advanced
  • Selected View Certificates to access the Certificate Manager
  • Then by clicking Import and browsing to your exported CA Cert you can import the internal certificate.

I hope this helps.