User blog comment:Master Ceadeus 27/An Open Letter to Wikia, Regarding Change/@comment-26355524-20141207001251/@comment-957747-20141207013521

It looks like you're also running on Firefox lower than version 29. I would recommend upgrading Firefox to at least 29 (latest version is 34). The global header doesn't display well in Firefox < 29 due to it not recognizing the CSS being used.