It works perfectly fine on Firefox, it even moves as it's supposed to, seeing it's a gif and I added the appropriate coding. I've been at this for three hours and I couldn't find a fix.
The only thing that I've managed to do is make it stop showing my old favicon ( from the last time that I changed my tumblr theme, cause it got stuck on that for some reason, even if I had completely removed any trace of the 'icon' code ). I deleted the 'favicons' file and forced a favicon refresh, but now it's just showing me this.
https://i.stack.imgur.com/A8hpG.png
I don't remember ever having this problem before, at least not this badly. I always managed to change it, it never gave me so much trouble. At least it works in other browsers, I guess, but it's bugging me to no end.
Any tips? I'm new to coding, and I did NOT make my tumblr theme, I just added a few tweaks to implement some things that I liked, favicon included.
This is the link to my tumblr page: http://prickgraysonx.tumblr.com/