if you don’t have the plugin installed, you’ll be prompted to install it automatically. It’s a 45mb download, and you have to restart your browser. You can click hotspots both inside the panorama, and in google earth. Also, try the “tour” checkbox.
This is kind of an autopilot, you can sit back and fly around from place to place. Google Earth Browser Plugin for Mac OS X 10.4+ (PowerPC and Intel). The Mac plugin is supported on Safari 3.1+ and Firefox 3.0+.
Link to Google Earth API
Source text:
1) Google Geo Developers Blog: Google Earth… in your browser… on your Mac!
