Ahh... Sorry for the confusion. No, I was referring to the "radar cone" display within the app. It's the aqua blue/green shaded area on the radar and map. In the screenshot below, you can see one alert that's within the radar cone and appears as a red warning. The others that are to the east and north of the vehicle fall outside the cone and appear in gray.
No, I haven't "enabled" it to work in mobile browsers, since most users with mobile devices would just opt to use Waze instead. I wish Model 3 had a browser, it would have opened up a whole new market for Radar Alerts.