在「Upcoming Changes to Root Certificates in Firefox on Windows」這邊看到 Firefox 49 將會有選項可以讓 Firefox 多吃系統的 Certificate Trust Store：
This feature is available in Firefox 49 and up (currently in beta). To give it a try, set the preference
security.enterprise_roots.enabled to true. After that, Firefox should connect successfully to sites using certificates issued by 3rd party root certificates that have been added to the Windows trust database.
These features are still in the early stages, so if you encounter any unexpected behavior, please feel free to file a bug.