Please go to ''about:plugins''. Do you have '''Widevine Content Decryption Module''' turned on? What's the Widevine version number?

https://support.mozilla.org/en-US/questions/1359657#answer-1463359 and updated to 95.0. . . . I finally found where the plugin "Widevine Content Decryption Module provided by Google Inc." was not updating to the newest version of December 1, 2021. Ver #4.10.2391.0 cor-el; Make sure you have the latest Widevine version. 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