I'm working on a fairly large site and am having trouble managing z-indexes. Is there a Firefox add-on that will look at a page and give me an ordered list of every element with a z-index declared? That would save a ton of times for the cases where a z-index was wrong or hard to find.
You find it here
https://addons.mozilla.org/en-US/firefox/addon/60
When you have installed the Web Developer Extension, choose from its menu
Information > Display Topographic information