It only supports Internet Explorer and Firefox at the moment, as you know, and I doubt that they will be adding on any other browsers any time soon. However, miracles do happen. Try using their feedback form HERE.
Thank you and McAfee-feedback for replying (quickly),
Hello, SiteAdvisor currently works with Internet Explorer and Firefox. SiteAdvisor intends to support additional browsers in the future, and weappreciate the enthusiastic reception of SiteAdvisor by users of manydifferent browsers. We do not have a firm timetable for additionalbrowser support, but we will make announcements when additional browserplug-ins become available.