Sometimes it's not intentional JS blocking. I run adblock and ghostery and by blocking 3rd party scripts some crucial part of a site just break also. For examp

Sometimes it's not intentional JS blocking. I run adblock and ghostery and by blocking 3rd party scripts some crucial part of a site just break also. For example, people track link clicks in a web app and they do it with Google analytics. If not handled correctly, it will break all the navigation on a page.