ADMX and ADML for Intune to set another config profile

We currently have a policy in place to block extensions in Firefox. Apparently, we need to create another policy that allows only approved extensions. However, we can no longer create this policy because the relevant settings are no longer available, as the previous ADMX and ADML files are in the process of being removed. The removal cannot be completed because the ADMX and ADML files are still being used by the existing policy. We also cannot delete the current policy because it is deployed in production. Does anyone have any recommendations on how to resolve this issue without affecting the production environment?