It seems the front-end code is trying to load data from a HTTP app hosted in Heroku, but the browser blocks it because it's not being served through HTTPS. The error is quite clear in the console:

Mixed Content: The page at 'https://component.github.io/' was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint 'http://component-crawler.herokuapp.com/.json'. This request has been blocked; the content must be served over HTTPS.

I'm at Mac OS 10.9.5 Mavericks, using Google Chrome 41.0.x.