Add a View Source on GitHub button to the omnibar to any GitHub page (using the `github.io`) domain.
Image from store
(2018-03-05) Ajay Karwal: I came looking for this extension because I thought I would make one myself as it's something I could really do with.
It works well, however the button is not added to the omnibar, which I would have preferred.
(2016-06-22) Thomas Steiner: So simple and yet so useful! Thanks!