View documentation for Ruby projects on GitHub using the RubyDoc.info YARD documentation server.
This extension adds a small icon to Chrome's address bar that appears when you are browsing GitHub repositories. Clicking the icon will allow you to view the RDoc documentation for the repo on RubyDoc.info.
By the way, this extension has a GitHub repo. Pull requests are welcome: https://github.com/Ajedi32/rubydoc_github