Camera directed after picked mesh

[Dad72]

Hi,

 

When one clicks on the scene by keeping this click down, one can directed the camera. On Google Chrome when I pick an object, I owe clicked on the scene for directed the camera. 

 

Now, the problem is with FireFox and I do not manage to understand why that this produce:

When I pick object, the camera directs during movement of my mouse without I having the click down on the scene (as if clicks it was always to down after the pick). Why this kind of reaction occurs. Have an idea of what could produce that?

 

Thanks