Firefox likes to manage its own trusted root certificates.
This should get you pointed in the right direction:
https://docs.vmware.com/en/VMware-Adapter-for-SAP-Landscape-Management/2.1.0/Installation-and-Administration-Guide-for-VLA-Administrators/GUID-0CED691F-79D3-43A4-B90D-CD97650C13A0.html
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