A vision system for a vehicle includes an attachment element adhered to the in-cabin surface of a vehicle windshield at a windshield first location and an attachment member adhered to the in-cabin surface of the vehicle windshield at a windshield second location. The attachment element is configured for mounting thereto an interior rearview mirror assembly. An accessory module is configured to attach to and be supported by the attachment member adhered to the in-cabin surface of the vehicle windshield. The accessory module includes a forward facing camera that has a field of view through the vehicle windshield. The forward facing camera may be a component of a collision avoidance system of the vehicle. A light absorbing layer may be disposed at the vehicle windshield to at least partially mask the presence of the attachment element and/or the accessory module from view through the vehicle windshield from outside the vehicle.