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The camera control is nigh-unusable for me in Firefox 53.0.3
I think this is browser-independent. If the author were to position the camera relative to the quadcopter it would be much more usable. Also need to have the camera's target update each frame to track the quadcopter position. Since they are using three.js OrbitControls, they can just call this each frame:

   controls.target.copy(quadcopterPosition);
Hmmm. Not very realistic unless that is a huge and heavy quadcopter.
The Charles River RC Simulator (crrcsim) has a nice quadcopter option.