To use Google Earth with Firefox , you don't actually need to download a browser-specific plugin anymore. While older versions required specialized downloads, modern versions of Google Earth run directly in your Firefox browser or as a standalone desktop application called Google Earth Pro. How to Use Google Earth in Firefox (No Download Required)
For a more integrated experience, you can also download official browser extensions: Earth Versions – Google Earth
Click to start exploring 3D satellite imagery directly in your browser tab. Download Google Earth Pro for Desktop
and ensure it is updated to the latest version. Navigate to the Google Earth Web site.
Run the installer to complete the setup on your PC, Mac, or Linux machine. Firefox-Specific Extensions