Location awareness not working in Firefox 4

Google's geo-location  location awareness doesn't seem to be working. Some possible conflict between the gears implementation and FF 4 support for it?

Google gears shows that it supports:

• Windows XP, Windows Vista or Windows 7
• Firefox 1.5-3.6
• Internet Explorer 6.0-8.0

 No solution yet to this trouble.  I'll post an update if/when I find one.