I'm using 67 and it works fine for me. What doesn't work for you?
looks like firefox' content blocking prevents some resources from loading, basically disabling your site.
apart from the obvious google tag blockage this one pops up in the console:
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://www.reddit.com/r/EarthPorn/hot.json. (Reason: CORS request did not succeed).