I am a big fan of HootSuite, it is a great tool to kind of aggregate all your social networking needs. The HootBar extension for Firefox will let you post messages to Twitter and other social networks right from the Firefox address bar. Additional features include more customization options and allows you to post to all the social networks that HootSuite supports: Twitter, Facebook, Linkedin, Foursquare, WordPress and more.
Here is a list of HootBar commands:
–post sends messages directly to Twitter
–hoot opens the message in the Hootlet
–options opens a new window with posting preference options, URL shortener options, etc.
–account allows you to add multiple Twitter accounts
Here is a little more about the add-on from the developers:
The beauty of the app is in its simplicity for quickly spreading messages. Just type a message and append it with one of the HootBar commands to post directly to Twitter; open the message in the Hootlet; choose multiple accounts; or choose from even more posting options.
Interested in giving it a shot? You can download the HootBar from the Firefox Add-ons website.