One fad that has caught on in the past few years is the art of shortening those really long URLs, as you would find in a search result or on Amazon for a product listing. When you try to share just the long link, it often gets broken or just will not fit in the message you are sending. That is where these tools come in handy to have.
The winner (and best URL link shortener) would have to be Shrinkify.
It not only shrinks your URLs via Firefox, Shrinkify also gives you a pretty interface when doing so. Out of all the URL shrinking extensions, this one is the best, hands down.