See McAfee for information about when they're going to have a new version of their Site Advisor available. Mozilla has nothing to do with McAfee, and nothing in Firefox needs to be "updated" to fix the problem with McAfee which caused Mozilla to block that add-on. In June when that add-on was added to the blocklist McAfee said the 3rd week of July for a fix, and when that came and went, they said "sometime" in August.