I dealt with an unusual number of these this week and submitted them all to https://www.trustedsource.org/en/feedback/url?action=checksingle&sid=6A9B2E128E3 96E3E342E3FDA2A07EF19&p=mcafee
All of these URL's were categorized as Malicious Sites (and therefore blocked) over the past week ... and are parts of sites where other URL's are not considered malicious.
Some heuristic site categorization run amok?
http://cdn1.editmysite.com/libraries/prototype/1.7-custom/prototype.min.js?2 (dealt with on 8/4 since fixed by McAfee apparently )
I dutifully opened a ticket on it fwiw.