Learn String Manipulation by Building a Cipher - Step 35

Help please. In this section, the site do not show the problem asked, and it don`t show the “Check you Code” button either. I tried to logout and log in, cleared the cookies, cleared cache in navigator. All other lessons pages are ok, but this one happened this.
What could that be?
Thanks very much!

Please show a screenshot of all the boxes you checked when you cleared from your cache and cookies (hopefully all at once)

I don`t know if I understood what you mean, would it be that?
Thanks

That doesn’t show you clearing your cache and cookies

I installed Chrome and it worked.
I have done something that messed up Firefox.
Thank for your instructions, now I have the “check you code” back, thank you very much