Firefox CSP violations on Mac?

Anyone know what’s up with the CSP violations in Firefox? Try this: generate a new ember application and open it in firefox. You’ll get 7 CSP violations, all of the form:

  "script-sample" : "width:100%;height:100%;",
  "source-file" : "http://localhost:4200/",
  "violated-directive" : "style-src http://localhost:4200"

Interestingly, this only happens on Firefox on OS X; I tried it on Windows 7 through a VM and saw no such CSP violations. Chrome on both platforms is quite fine.

Totally weird.