To change the Firefox configuration so that is will trust certificates from the Windows certificate store, follow the steps below.
1. Open Firefox and enter "about:config" as the URL. Click "Accept the risk!" if prompted. This will bring you to a list of configuration parameters.
2. In the parameter search field, enter "security.enterprise_roots.enabled". This will narrow the list down to the parameter you need to change. Double-click the parameter so that the value changes to "true".
3. Close Firefox and re-launch it.
If you still receive the same error from Firefox after completing the steps above, it means that the rootCA and/or intermediate certificates are also not stored in the Windows certificate store. You will need to contact your security administrator for further assistance.