Note
Just to be clear, this can work on any site, and this can block any audio file. But just for the sake of this gist—we'll be focusing on how to disable the sounds played when listening to a voice note.
The voice message chime is annoying—imagine listening to a voice note and you're doing something else, just for a loud ass sound to go down in your eardrums as it goes to play the next one.
You can go look and use the userscript if you want to, it's just that the .mp3 filename for both the "continuing" and the "finish" chimes has been changed since when this gist has been created. If you've imported the userscript and the chimes are still playing, continuing reading this gist to understand how to fetch and update the filename in the userscript.