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=6A9B2E128E396E3E342E3FDA2A07EF1...
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.