Click the back button in your browser

That's just an image, though. It's not actually a page. And since you're on Firefox, the image is centered with a dark grey background, which imitates the common UI modal design pattern... but it's not.

Now why they would think to make that image a clickable link is beyond me...

It's a Wordpress default that images are links to themselves.

Why it's a Wordpress default is beyond me...

"what is this, wikipedia?"

Someone actually prefers lightboxes over direct links to images?? I've always hated them and assumed they were a nuisance to everyone. I guess one's beliefs are challenged every day...