Script Summary:
Instead of an 'in reply to [someone]' link on twitter, see the actual tweet in a tooltip

Supported browsers: Firefox, Chrome
Unshorten shortened urls (tinyurl.com, bit.ly etc.) in twitter and identica. You can see the actual url on the status bar, as you hover your mouse over the link.faq
"I am not seeing the tooltip for a reply to foobar" :
You have either hit the twitter API limit (150 req/h) or foobar has protected tweets.