- install extension.
- goto github.com
- view a repo
- click on commits
- console shows:
Refused to execute inline script because it violates the following Content Security Policy directive: "script-src https://github.com https://a248.e.akamai.net https://jobs.github.com https://ssl.google-analytics.com https://secure.gaug.es https://collector.githubapp.com https://gist.github.com".
Perhaps Google Chrome changed it's security policies? 
Version 26.0.1410.65 on (Mac OS X 10.8.3)