Is there any way to disable audio by default when auto-expand is on?

I've noticed recently that as I'm paging through lemmy in firefox if a video is posted it will start auto-playing with the volume maxed. I don't mind it autoplaying before I get there but it's very annoying to have a page load and suddenly getting blasted with unexpected sound.

an example post that does this: https://lemmy.ca/post/22495123