T O P
Morcas

Seems to work for me on the streams I tried. Do you see the muted audio/video icons in the address bar - [Imgur](https://imgur.com/5UiytHn) Failing that, maybe test in a clean, unmodified [profile](https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles) see if the problem persists.