The Original Bitly Javascript Bookmarklet
For those who want the old style of Bitly, this javascript still works for me. Copy it and past it into a toolbar bookmark in Firefox, or the equivalent in other browsers.
javascript:var%20e=document.createElement('script');e.setAttribute('language','javascript');e.setAttribute('src','//bitly.com/bookmarklet/load.js');document.body.appendChild(e);void(0);
When you click this while on a page, you’ll get a pop-up window with a shortened URL, like this:
Hitting the share button leads to saving the Bitly and posting the text and short URL to Twitter.

