An electronic device may include a device housing having a topside and an underside. The electronic device may also include a mounting frame movable above the topside of the device housing and a finger biometric sensor carried by the mounting frame. A flexure member may be coupled to the underside of the device housing and configured to upwardly bias the mounting frame relative to the device housing. A pushbutton switch may be operatively coupled between the finger biometric sensor and the topside of the device housing.