What photo viewer plugin is used on this site?

Question

Habr Q&A

It is very similar to picasa from Google, but I did not find a plugin on the Internet. (I'm talking about the full-screen window that opens when you click on the picture)

Answer 1

did it yourself, you can see

Answer 2

Search at the very bottom (free theme), here .
The functionality of displaying a picture is self-written here and has already been added to the theme manually.
It is possible that a custom lightbox was used .