backgrounds for your popup. you earn kibble by focusing, one a minute, and duplicates pay out too.
open the extension, presets tab, pick one.
kibble lives on your own machine with the rest of your collection, which is why the shop is in the extension and this page is only the catalogue.
a 30 minute session earns 30 kibble. more with a streak, more again in a group. none of it touches drops or the leaderboard.