Visit https://he.wikipedia.org/wiki/%D7%A7%D7%95%D7%A8%D7%91%D7%9F_%D7%A4%D7%A1%D7%97?useskin=minerva on desktop and open an image. Media Viewer opens correctly. When you close it, you end up with the mobile site's image viewer, which probably loaded behind Media Viewer. And you get stuck, because that can't be closed.
It seems like the mobile image viewer should just be disabled with Minerva as a skin, as Media Viewer seems to work fine.