This Firefox Add-On assists you when you encounter a dead github.io page. Let's say you found some `*.github.io` link on some blog, and the page only shows a big 404.
Maybe the owner moved the pages url, or maybe moved the repo? In order to find it, you must search for the user on GitHub and browse for the repo. If you know url juggling, you may swap things in url to get to the GitHub profile directly, and that is exactly what is Add-On does ! It provides two links on the page, one for the user's GitHub profile, and other for the page's repository !
