Help Required: Theme Header Not Appearing In Firefox!

Hey there, I’m looking for a little help. I recently installed the latest release of WordPress on my server, and it’s running fine. I have encountered one small problem though. When I view my website through Mozilla Firefox the template header is not visible. I can see it using internet explorer but not Firefox. Now I’ve used older releases of WordPress in the past and have never come up against this problem. It’s the same with all templates I apply, and is only an issue now I have switched to a custom header. Does anybody think they could help me solve this issue with a solution of some sort. Any help is greatly appreciated.

Site: https://www.thecultmovieasylum.com

– Lukster