Education/ComputerScience/ProjectSuggestions

I want an add-on or extension that knows when I click on a URL from a URL-shortening service, and then gives me a popup saying "This is the real url, are you sure?" In a perfect world, this extension would also be updated when one or more of those URL shorteners gets jacked by spammers, which is inevitable. Note that this is not a greasemonkey script to rewrite tinyurl.com to preview.tinyurl.com, for exampl; if it's not in the user's browser, it's not good enough. This is a plugin for people who don't trust url shorteners.

-mhoye