Problem to view my banner on firefox

[amiens.nation.airsoft17]

Hello!

I updated my website www.ana-airsoft.co.cc, and now I can't view my banner on firefox

You can view it perfectly on IE but not on firefox.

I'm a newbie in programming, can you help me to view it on firefox?

PS: sorry for my bad English, I'm French

[Darkmere]

I use FireFox and everything is showing as it is supposed to for me