DMG compatibilty with browsers

[RGould8 at aol.com]

Can anyone tell me, from a Mac perspective, what various browsers to by 
default when one clicks on a hyperlink on a web-page that is a .DMG file?   

I'm finding that on my Mac, Safari downloads the .DMG and automatically 
mounts it.   IE just downloads it and does not auto-mount.   Curious if that's the 
way it's working on your Macs as well.   Also curious what FireFox does, and 
Opera, etc.