I had this issue on my desktop in Windows. Haven’t tested to see if it’s an issue on Linux (I just recently set up dual-booting with Kubuntu). I know your request is for Nobara but this may be helpful for troubleshooting.
The fix for me on Windows was always to power off my audio interface. Using powercfg /requests would show Firefox kept the audio device active once a YouTube video started playing. The software fix was arbitrary… sometimes closing the YouTube tab would work, sometimes I had to close the window, and sometimes none of those would work. What *always" worked was physically powering off my interface, waiting about 2 seconds, and turning it back on.
I love the idea but not the messaging. Older folks & non-nerd people - a vast majority of the demographic of people who would benefit from this campaign, if I had to guess - aren’t going to want Linux or “fresh new software”. They want a computer with a web browser, an Office suite, and an OS/layout that functions exactly the way they expect it to.
If you tout so much change, they’re going to lose interest. I’d argue they’d lose interest seeing technical words like “software”, since all they know on phones and computers are “apps”.
However, If you instead show them side-by-side how they can do the exact same tasks with nearly identical steps and also emphasize the benefits like cost effectiveness and speed… they’ll just say “okay great, can you do it for me?”