twitbin - This one lets you creates a sidebar for Firefox and this helps you stay updated, on what going on on your twitter.

TwitterBar - This plugin would let you send tweets from your firefox address bar.

TwitterFox - Amazing add on, that places an icon on your bottom bar that gives you notifications and allows you to tweet.

Firefox Search Plugin / lud.icro.us- This one can let you tweet from your search bar.

TwittyTunes - This plugin would let you show people on twitter, what you are listening to.

TwitterNotifier - notifies you with updates from your Twitter friends. Instead of being located in the sidebar, it’s activated with a small icon in the right bottom corner of Firefox.

Power Twitter - Unlike other plugins, adding functionality to Firefox, this one works on your Twitter page.  It is ideally named as it is capable of embedding Flickr and YouTube, shows you the true addresses of tinyurls, maps links to web page titles.

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