You can toggle DRM off/on to see if that makes Firefox (re)load DRM components.

• Settings -> General: Digital Rights Management (DRM) Content
• 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://firefox-source-docs.mozilla.org/devtools-user/browser_console/

• Tools -> Add-ons -> Plugins

You can toggle DRM off/on to see if that makes Firefox (re)load DRM components.

• Settings -> General: Digital Rights Management (DRM) Content
• 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://firefox-source-docs.mozilla.org/devtools-user/browser_console/

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• Tools -> Add-ons -> Plugins

I did that multiple times, including turning it off, closing the app, then opening again and turning it back on but nothing.

I checked the XHR and this is what I get:

My issue got resolved in bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1930682

I basically was suggested to change a setting to true:

Go to about:config, flip media.gmp-widevinecdm.force-chromium-update to true.

This preference is only available in beta, nightly and firefox 133 (due to be released on Nov 26).

I will use one of the release channels that has the preference and will update to 133 once it is released.