An accessory mounting system includes an assembly adapted for mounting or attachment at a portion of the windshield of a vehicle. A light absorbing layer at the portion of the windshield of the vehicle at least partially hides the assembly from view by a viewer external the vehicle when the viewer is viewing through the windshield with the assembly at the portion of the windshield. The light absorbing layer includes a light transmitting portion, and a forwardly-viewing camera disposed at the assembly views through the light transmitting portion of the light absorbing layer at the portion of the windshield of the vehicle when the assembly is at the portion of the windshield. The assembly may comprise a pivot element for connecting to an interior mirror or the assembly may comprise a mirror assembly mount button received by a mirror mount of a single-pivot or double-pivot interior rearview mirror assembly.