Thanks for clicking! Clicking 'use IPFS' makes all the images point to the local IPFS gateway on 127.0.0.1:8080, so browser can get the images from people who pin (distribute) them, like in a bittorrent. But even if you installed it, it wouldn't work because currently I don't pin image files on IPFS. IPFS daemon consumes a lot of ram and cpu resources, so I decided to shut it down.