This issue is about audio output. Audio and video input are both behind per-site permissions.
Also, people can and should go to the firefox settings > Permissions and data > Autoplay and change the Default for all websites to "Block Audio" (at least).
You can set per-hostname exceptions if you like! CTRL + I > Permissions
alt Hacker News
Also, people can and should go to the firefox settings > Permissions and data > Autoplay and change the Default for all websites to "Block Audio" (at least).
You can set per-hostname exceptions if you like! CTRL + I > Permissions