I’m here in December 2024 and having the same issue. The audio widget does not work in Firefox still. I used to use Safari all the time and recently switched to Firefox. Went to my website and thought the link was somehow broken because it didn’t work and uploaded all my music again thinking this would fix it. Still doesn’t work on Firefox, but works on Safari. Have there been any developments? Thanks.
Hey there, @user19067 and welcome to the Community 
Could you please send me a link to the page where your widget is installed?