UTF8Twitter Greasemonkey Script

UTF8Twitter is a Greasemonkey script that adds a bar to the top of your Twitter page so you can add UTF8 characters at the click of a button.

FireStatus

FireStatus is an experimental Firefox plugin that allows you to quickly send notes to Twitter, Facebook and FriendFeed. It also displays updates from these services in notification popups. If you wish to share a certain URL, just stand on the desirable webpage, open FireStatus, add a short note, and fire your status away. (via)

TwitKit

TwitKit is a Firefox add-on that works on Mac, Windows, and Linux. The add-on lets you interact in Twitter in several ways. You can view a “me” tab where you can see all the stats about your friends, your location, how many times you’ve updated, etc. You can manage your network on tabs named “friends” and “followers” and you can reply, favorite, and delete tweets.

Update, 8/3/08, TwitKit blog:  TwitKit 1.1. released. Here’s a list of all of the new features, ordered by when they were complete:

• Undocking. Click the little arrow in TwitKit’s top-left corner, and it’ll jump out of the sidebar and into a separate window.
• Tab images. Instead of having those word-filled tabs take up space, we decided to use images. This makes the top area a lot less cluttered, and will allow us to implement other super-secret features later on.
• SSL support. This allows your connection with Twitter to be secure. The option can be modified in TwitKit’s preferences window, in the “Connection” area.
• New icons. The Fugue icon set has given TwitKit a great, fresh look.
• Markdown support. This allows you to put things like italic, bold, and underlined text in your tweets - using John Gruber’s awesome Markdown system.
• Copying selected text. We’ve added another icon next to the “Compress URL” button - Copy Selection. This will copy any text that’s selected in the main Firefox window - or if nothing is selected there, it’ll copy what’s selected inside TwitKit. This means you can retweet by highlighting the tweet and pressing the button.
• Localization support. We’ve added 3 new languages in this release - German, Japanese, and Hebrew. Thanks to @Heini, @turutosiya, and @GuyLevin respectively for performing the translation! (Follow them on Twitter; these guys are schweet.)
• Reply highlighting. If someone tweets a @reply to you, it’ll be highlighted. (You need to be logged in for this feature to be enabled.)

TwitterScript

This Greasemonkey Script lets you send tweets right from Firefox. If you’re not running Firefox 3, it will ask you for your username and password. One problem: doesn’t work with Gmail.

Twitio

Twito.us lets you share what you’re reading in your browser with your friends on Twitter via this bookmarklet. Similar to TwitThis. (via shegeeks)

TwitterFox

TwitterFoxis a Firefox add-on for Twitter, but unlike similar Firefox/Twitter add-ons, it doesn’t take up space in your browser sidebar. Instead, TwitterFox stays in your system tray until you need it and then it pops up when your contacts post a tweet. This is more like an AIR app than a Firefox add-on. You can also sort your tweets or tweet yourself from TwitterFox.

TwitBin

TwitBin is an extension for Firefox that brings the power of Twitter right in your browser. With TwitBin, you can quickly and easily send and receive messages via Twitter in Firefox. The project is free, funded by small ads ad the bottom of the page.