Stops the music when minimized. Weird since that's the point creating an extension like this, to keep playing music while minimized, without occupying the tabs on top.
I found a workaround though, but it might be annoying to some (I admit it annoys me too.) Just click the pin on the top right so the extension won't minimize and the music won't stop. Problem is it occupies like a fifth of your screen (resizable but it takes up too much screen space)
The dev should update this. Just because we have workarounds doesn't mean it has to stay this way.