All I can see is a photo with the caption "Make brilliant collages with your pictures. Any pictures from Facebook, ? and Instagram". Clicking everywhere does no

All I can see is a photo with the caption "Make brilliant collages with your pictures. Any pictures from Facebook, ? and Instagram". Clicking everywhere does nothing, scrolling up or down does not reveal anything. I'm using Firefox on a widescreen laptop. Going full-screen shows "Try it with Chrome or Safari on your desktop". Aha! So I load it up on Chromium. It does work there, and the interface is pretty. There doesn't seem to be a way to make a collage without publishing it. It doesn't seem to be something I'd use a lot, but then again, I don't have a camera.