Think I may have found a bug. When trying to load a JSON feed which isn't behind HTTPS, FireFox blocks it from being loaded on the board:
`Blocked loading mixed active content`
https://developer.mozilla.org/en-US/docs/Security/MixedConte...
In an ideal world, every cheap IoT device would have an valid SSL certificate - but that's a long way off. Perhaps your site should try to proxy the requests rather than relying on the user's browser?