There are a lot of URL shortener services out there. They take that really super long URL from a place like Amazon.com and make it into something that is easy to cut and paste into a blog post or a Twitter even. Shrinkify is another awesome answer to this problem that gives you that ability to shrink URLs right from Firefox.
Here is a little more about the Shrinkify extension from the developers:
The Shinkify Firefox extension makes long, unwieldy URLs shorter with the Shrinkify.com web service. Using either a toolbar button, right-click menu item, or tools menu item, you can submit your current url to the Shrinkify web service. The shrinkified URL will then be copied into your clipboard.
Also might be worth noting that the Shrinkify extension came in 8th in this year’s extend Firefox competition. So if you are looking for a simple way to shrink your URLs built right into the browser, Shrinkify is your best solution.