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.