Stop short URL abuse by previewing the URL automatically before visiting it.
This addon will show you a preview page clearly displaying the destination URL whenever you visit a shortened URL.
Want support for more? Feel free to suggest something. :)
Want to help out? This code is on github https://github.com/Azelphur/Preview-Short-URLs patches welcome!
Feel free to drop by irc://irc.azelphur.com/#azelphur if you have any questions.