5 minute fork

5 minute fork creates a temporary clone of a github repo when the repo owner hasn't hosted their demo. This extension adds a '5 minute fork' button to github repos to quickly and easily clone.

As explained on HackerNews:

"If a github repo has an index.html file and you click on it, github will show you the source instead of the webpage. 5minfork shows you the webpage so that you can have an idea of what the repo is about."