Is there a way to see the stacking context, in IE/Firefox/Chrome/etc.?

Question

I\'m trying to track down a z-index problem. I\'m looking at the page in IE9\'s DOM Inspector, and I just can\'t figure it out.

I have one element with a z-index of 100

Answer 1

in newer versions of firefox you have 3D view by pressing Ctrl+Shift+I then clicking the 3D or 3D box icon to access