In the meantime, it looks like the Google Maps are working just fine on Firefox, however the yahoo maps on the cache pages aren't working quite right as you said. I am sure they are working on it.
I disagree - Google Maps option on Firefox doesn't work for me. The maps come up, but no caches. The spinner just hangs on "requesting geocaches"
Firefox v. 2.0.0.14
User agent string: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14
Windows XP SP2
Error reported when I turn on FireBug: eo_GetObject is not defined