Cannot stream from Firefox on iMac 27"

I have been streaming from my iMac for a very long time with no problems always using Firefox. The other day my streaming quit. No sources would work. I have a cable connecting to my stereo (Antiquated but works fine!) and even disconnecting the cable didn't help. No sound came out of the speaker. Other browsers, Safari and Duck Duck Go, work fine, both with or without the cable being connected. I thought it may have been a browser system problem and went to plan B for a few days but the issue still persists. I've tried a reboot, all my browsers are updated to the latest versions and I made no changes or even updates prior to the problem showing up. It isn't the end of the world, but it is frustrating.

Sequoia 15.6.1