I think your extension could provide value if people could choose a field of interest. Like if I could stumble through articles about China or about animals or even about broad things like people or places, that would be neat.
Ah yes, didn't see this comment before I wrote my last one. But exactly, that would certainly be interesting if you got enough users to make the results meaningful (or perhaps curated a large bunch yourself initially).
Another thing that might be handy for something like this long term is making sure I don't see the same page more than once. But that would be a lot more data for you to store.
That might be handy for people who want to study a certain subject one day. For example, if I could keep hitting a button to get random articles from a certain category, such as computer science or math.