Twitbin is a free plugin for Firefox that lets you track all your Twitter updates directly from Firefox, without using any Twitter client. Twitbin shows as an icon on your Firefox, and when you click on it, it opens up a sidebar with all your Twitter updates. Twitbin sidebar stays open on the side of all your brower windows as long as you want, so that you can keep doing what you are doing, and still keep track of your Twitter updates.
I had recently reviewed a plugin for Google Chrome called Tweetings that lets me track all my Twitter updates by one click. I was looking for something similar for Firefox, and found Twitbin. Twitbin works a lot like Tweetings. One feature that I like more in Twitbin is that it opens as a sidebar, so that it can always stay on screen, as opposed to Tweetings that closes as soon as you click somewhere outside.[subscribe-to-us]
Twitbin lets you send tweets, check your Twitter timeline, see replies, and all other common Twitter related functioanlities. Twitbin is completely free, and is a good addition to Firefox. If you prefer to use Twitter directly from Twitter.com, make sure you check out PowerTwitter plugin for Firefox that greatly enhances interface of Twitter.