error code f7701-1003

Make sure you have the latest Widevine version (4.10.2391.0). *Tools -> Add-ons -> Plugins You can toggle DRM off/on to see if that makes Firefox (re)load DRM components. *Settings -> General: Play DRM *https://support.mozilla.org/en-US/kb/enable-drm You can possibly check the XHR requests in the Browser Console if this doesn't work. *https://developer.mozilla.org/en-US/docs/Tools/Browser_Console