I desperately need to find a solution to locking my media keys to a specific app (Petrichor in this case, lovely local-only music player)

I'm trying this in Zen (Firefox)

about:config
media.hardwaremediakeys.enabled , false

but if that's no good, I'll need to find a little app to handle it 😩

So far so good! No more video pausing when I want to only control the background music 🥳