Great news. It looks like the problem I was experiencing in Firefox was due to my overlay being larger in height than the map container and assuming that Google Maps was setting overflow: hidden somewhere (I guess not). Setting it myself fixed that.
The next step is to have your overlay container catch the click events and make sure that they aren't propagated as shown in the ExtInfoWindow code: http://gmaps-utility-library.googlecode.com/svn/trunk/extinfowindow/1.0/src/extinfowindow.js (near the end of initialize).
The answer is in niiko's link to ExtInfoWindow code. I've pulled it out and inserted it into a skeleton custom overlay.
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