[wlug] Problem with Google Earth Updating

When I try the above from within the application, I get the following message: "Could not launch any web browser. Please make sure you have set the $BROWSER environment variable to the name of the filename we should launch!" When I issue the command "env", among the output, I find the following: "BROWSER=Firefox" Why is that not sufficient for Google Earth's purposes? Do I need to add a version reference or some other thing?