Is there really no solution for this problem?

Hi Fred, one possibility is that the page is stopping the player when it receives some signal from Firefox. This would be along the lines of video sites that pause when you switch tabs. Another possibility is that Firefox receives a signal from Windows to stop playing; I'm not familiar with how that works. Another possibility is that Firefox keeps playing, but since it didn't instruct Windows to keep the speaker active when power saving kicks in, Windows ignores the audio. Perhaps you can distinguish among these by checking the player when you wake up the system. Has it continued to progress beyond the point where the sound stopped, or did the player stop at that moment?

For testing, maybe use a locally saved MP3 so you can use the full controls.

Thanks! I found a solution for this problem: https://www.youtube.com/watch?v=9o-3-EayO-Y