This is not 100%, Just a Theory.
Google Earth, The Website Won't Work on Other Browsers Like Firefox.
So what? They want you to use Chrome.
Or Download Google Earth Pro.
If you don't use Chrome you need Google Earth Pro.
They want you to use that so they can track you with ads on Google Earth Pro.
Chrome Tracks you for advertising.
And if you download Google Earth Pro, Google Earth Pro Will Track you for Advertising.
You Want to use Firefox To get away from Google Tracking.
They Track you Another Way.
Let me know in the comments what you think about my theory.