The NoScript Misnomer: Why should I trust vjs.zendcdn.net? NoScript is a popular Firefox addon that blocks active content such as Flash, Java, and JavaScript on all sites by default. When you install NoScript you are explicitly trusting these sites to execute Java/Flash/JavaScript even when it is set to forbid scripts globally. The list includes the following: afx.ms ajax.aspnetcdn.com, bootstrap.com and bootstrap.com.”]
Source: https://thehackerblog.com/the-noscript-misnomer-why-should-i-trust-vjs-zendcdn-net/