I dont see the activity in the Network tab. I do the following:
- browse to http://www.google.com (and login)
- open the network monitor
- clear the results
- copy/paste the url (https://www.google.com/maps/timeline/kml?authuser=0&pb=!1m8!1m3!1i2015!2i8!3i2!2m3!1i2015!2i8!3i2) in the browser address and hit enter
- nothing is added to the network monitor, but the kml file is downloaded.