Post to Twitter from the Firefox address bar : TwitterBar

Twitter is the micro-blogging site that is getting ever more popular. With posts limited to 140 characters the emphasis is on quick and easy. TwitterBar is a twitter FireFox extension which lets you tweet directly from the FireFox address bar! A small Twitter icon sits to the right of your address bar; clicking on it will post your tweet, and you can hover your mouse over it to see how many characters you have left.

You can also post by typing “–post” at the end of your tweet. Clicking the Twitter icon when visiting a webpage will send a tweet containing the URL of the webpage you are currently viewing.