A vision system for a vehicle includes a mirror mounting button attached at a first location at an in-cabin surface of a windshield and an attachment member attached at a second location at the in-cabin surface of the windshield. A light absorbing layer is disposed at the windshield and at least partially masks the presence of the attachment member from view by a viewer who is viewing through the windshield from outside the vehicle. An accessory module is releasably attached to the attachment member and accommodates a forward facing camera. With the accessory module releasably attached to the attachment member at the windshield, the forward facing camera views through the windshield. The forward facing camera includes a component of a camera-based driver assistance system of the vehicle.