When I go to this site http://www.google.com/recaptcha/api2/demo The recaptcha does not load. In firebug the network profiler says the requests for the Javascript files from google were aborted. Also js files from the google cdn are aborted. <script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script> I have already ensured js is enabled. I tried debugging in safe mode. I disabled mixed content blocking. What do I have to do to prevent firefox from blocking these files?