LifeHacker has chosen ScribeFire for Firefox as their Download of the day, and I must agree with them.
Formerly known as Performancing for Firefox, the tool allows you to easily post to your blog from a browser window. Here is some text from LifeHacker on the plugin.
Like its predecessor, ScribeFire opens a split panel that provides a full of text-editing tools, complete with rich/source editing tabs, a live preview, a post history and more. You can easily drag and drop text, images and links to the ScribeFire pane, making it super-easy to reference other sites and info within your blog entries. The latest version, 1.4, promises improved support for Blogger accounts and better file uploading. It also supports the new WordPress API.
In addition to Blogger and WordPress, ScribeFire works with Jeeran, LiveJournal, TypePad and Windows Live Spaces. This killer extension costs nothing; it requires Firefox 1.5 or later.
I haven’t really given it much time or attention, and so I’d love to hear the opinions of others. Is ScribeFire as great as some people make it sound, or does it have too many drawbacks?