please help me make these photos work

I wanted to use daniel's dantendo thing. And I know they said it doesn't work on firefox but I saw some profiles that used it while using firefox and they worked just fine. They had custom colours, text and images and it worked. But I can only get the colours to work and I'm tweaking out. The buttons keep leading back to my profile instead of the tabs and the images are broken. Please if you could see me rn I'm on my knees crying. This is my last resort. I. Need. Help. If you know anyway to fix these problems I would love some help or advice please.