Wanted to share one of my favorite Firefox and WordPress plug-ins/extensions, After the Deadline. After the Deadline adds a spelling, style, and grammar checker to many web applications. I use it daily when updating my blog here at Technology-headlines. It also works with Firefox and most fields that require text input within the browser.
Point your browser to http://www.afterthedeadline.com/ for more information. Or you can download directly from within Firefox, click Tools menu scroll to add-ons then get add-ons and search for After the Deadline. I use it daily and highly recommend it.