Demos don't work: Blocked loading mixed active content

[nielsswinkels]

When I try to view the demo https://leaflet.github.io/Leaflet.heat/demo/ in either firefox or chrome it does not load. In the console I see
Blocked loading mixed active content “http://cdn.leafletjs.com/leaflet/v0.7.7/leaflet.css”

This seems to be because the files it tries to load are on http urls, while the page of the demo has https. When I try to view it as http it works. ( http://leaflet.github.io/Leaflet.heat/demo/)

[cluzier]

The demos are not working on the http or https urls.