We have Firefox-ESR in use and we are using Applocker. When we enable applocker dll Rule policys and start https://shaka-player-demo.appspot.com page clearkey addon crashes. We have allowed widevinedrm.dll in applocker rule policys, and we have used Process Monitor to track which dll file / files are being "locked" but we cant seem to pinpoint it. Where does Firefox-ESR run DRM content and which dll files are needed to run ? What we know that it is caused by applocker DLL rule policys, when disabling it clearkey addon does not crash and drm content can be played. Also Applocker eventlogs does not show anything related to this. br Ben