Lengthy links are annoying--especially if you're trying to share something within the strict 140-character constraints of Twitter. The TinyURL Generator Firefox add-on makes creating short links a breeze. This add-on adds a small link button to the lower-right corner of your browser.

TinyURL Generator lets you easily shorten URLs.TinyURL Generator lets you easily shorten URLs.To generate a TinyURL, go to the page you want to link to, and then click the link button. A TinyURL will automatically generate and copy to the Clipboard, and then you can paste it anywhere-- Facebook, Google+, Twitter, the Excel sheet you're working on, you name it.

Note: This link takes you to the add-on's page at Mozilla.org, where you can automatically install the file into your Firefox browser.