Algorithms killed wandering. So how does one discover new books by chance nowadays?
You're already opening new tabs all the time. Why not maybe discover a new idea, perspective, or book at the same time?
There's no way to pick categories, and no way to follow your friends...just quality, hand-picked ideas...some you'll love, some you'll hate, and some you won't be sure how to react to at first.
And if you're in a rush, just ignore it and keep going.
This extension is the least intrusive way to inject some good, old-fashioned chance into your intellectual life.