If you like to make use of TinyURL’s and Firefox is your browser of choice, then you need to take a look at the TinyURL Creator extension.

The usage is pretty straight-forward. Your URL is taken as input and then passes this along to TinyURL to give you the same thing you would get from TinyURL’s site. While this plugin isn’t the biggest of time savers, it is a lot more convenient than having to go to TinyURL’s site every time.