Hello TimBHitch,

Would you please go over this article :

https://support.mozilla.org/en-US/kb/block-autoplay

'Hope that helps .....

Thank you very much for your help.

TimBHitch said

Thank you very much for your help.

My pleasure, Tim  !

You can look at these prefs on the about:config page to see if these values work for you.

• media.autoplay.default = 1 [0=Allowed, 1=Blocked, 2=Prompt]
• media.autoplay.allow-muted = false
• media.autoplay.enabled.user-gestures-needed = false

For user-gestures-needed you can try true as well to see what works for you.

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• http://kb.mozillazine.org/about:config

You can look at this extension.

• Disable HTML5 Autoplay https://addons.mozilla.org/firefox/addon/disable-autoplay/

@ cor-el :

The OP wants to allow autoplay on one particular site only .....