Flash Playing in Container (FireFox)

Good day kind people.

I am experiencing an issue with Flash that I did not experience prior to recent days.  I am using the up-to-date Flash player 30.0.0.113

I belong to an online Karaoke site (www.singsnap.com) which uses Flash as its base.  In order to sing live in the chat room, I must enable "Stereo Mix" in my "Recording Devices" and make it my default communication device.  I also have my Yeti Blue Mic enabled.  Together with those two settings, I can sing live in the chatroom with sound being collected from my microphone mixed with the sound coming from the website.  I open a second tab, look up the song and I play that song.  The music player/recorder also uses Flash as well.

The issue I am having is that the sound for the website is not playing through the normal FireFox volume control, rather it is playing through a Flash Container which does NOT allow me to mix it with Stereo Mix.  The Firefox volume control is silent.  Muting it does nothing.  Muting the container kills the sound altogether.

I have tried many things in order to get the sound to play outside the flash container, but it continualy forces the sound into a container.

Playing sound from a website that does not use flash plays correctly under the FireFox volume control

This is NOT a graphics card problem.

Any help you can offer would be great.

UPDATE:  June 18/18

Somewhere I got a reply from someone asking for the URL of the site I was using.  I cannot seem to find that message anymore.  I did delete everything with Flash including the subdirectories and did a fresh install.   Install was successful but I am still getting the FireFox Container notwithstanding containers are not activated in FireFox.  Still at a loss as to why Flash is running in a container as opposed to just running through the FireFox volume mixer.

Message was edited by: Damien Dommer