@clarkwinkelmann I know that Flarum link that image to the CDN, seems that you don't checked emoji links with attention. If you check slowly the emoji links posted, into my install uses a different file 000023-20e3.png while into official forums it uses 0023-20e3.png.
The one linked into my flarum install dont exists, it's why don't work.
I tested many emojis but :hash: :one: :two: don't works, other emojis works good. I don't have any cross-origin issue, neither CSP headers. I tested into fresh install on Ubuntu 16.04 with Niginx+PHP-FPM and Apache+PHP. Always same problem into FireFox and Chrome.
It isn't a public install... was testing into my dev website. I used composer for a fresh install of latest beta.
I just tested :hash: into some flarum forums that are published arround and the result don't works.
You can check here (reply added from FireFox): http://www.openconquer.com/beta/d/7-pagina-web-full/5
Another example to check (reply added from Chrome): https://forums.odobros.com/d/16-hunter-guide/2