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Is Firefox causing issues with this for me?

I have gotten to the point where we add in the integers one, two, three, but when I save and refresh, my workspaces (in Firefox) show nothing. I just have the "Hello World" text. Same with the floating and distance to work examples. Nothing on my screen. I have seen the occasional notice in Treehouse where Firefox works differently. Is this one of those times or am I missing something?