This extension points all t.co urls on a page to their expanded url.
Sometimes twitter's url shortener is slow or unresponsive. Take them out of the equation.
This extension only runs on twitter.com and subdomains of twitter.com.
Since this is a background script, I added a screenshot of kittens. Not sure what else to do.
Image source: http://www.flickr.com/photos/35652310@N00/4139577452/