Adding Waypoint in Safari does not work properly

[Tojo]

Hi,

I am using Safari as my main browser and run into "trouble" by editing my GPX-File.

I wanna add a new waypoint between to existing waypoints but this is only possible by use the + button on the left in safari.
In the Chrome browser there is a red marker icon by hovering over there track and I can add a new waypoint by clicking in the map and drag it to the location I want. In Safari this does not work.

Do I have to enable in Safari or is this a Bug?

King regards

Tojo