Firefox 5.0 not compatible with McAfee SiteAdvisor?

I installed the update not too long ago and at the end of the update it said that this version was not compatible with my McAfee SiteAdvisor. It said I would need to update the current version of the application but idk if there is one. I really would like to have it back because I would like to know, when I google something, which sites are safe. Is there an update for McAfee SiteAdvisor that I can download? If not, how can get it back?