A vehicular interior rearview mirror system includes an attachment element attached at an in-cabin surface of a vehicle windshield and an interior rearview mirror assembly that includes a structure that includes a mount for attaching the mirror assembly to the attachment element, a pivot element, and an interior rearview mirror head pivotally attached at the pivot element. The interior rearview mirror head is adjustable by a driver of the vehicle about the pivot element to adjust a rearward field of view. At least one accessory is encompassed by the structure of the mirror assembly. The structure covers the at least one accessory from view by the driver operating the vehicle. One of the accessories is a forwardly-viewing camera and, with the interior rearview mirror assembly attached to the attachment element, the forwardly-viewing camera views through the vehicle windshield.