The Google Earth Plugin is a web browser plugin that lets you navigate and explore geographic data on a 3D globe across a variety of web sites.
The Google Earth Plugin is currently available for the following operating systems and web browsers:
Microsoft Windows (2000, XP, and Vista)
Apple Mac OS X 10.4 and higher (Intel and PowerPC)
You should also ensure that your system meets the requirements for Google Earth to ensure optimal performance.
If you're experiencing trouble with the Google Earth Plugin, try posting to the Google Earth Plugin discussion forum.