Text Formatting Toolbar ( Firefox Add-on ) enables user to add formatting codes in any text areas like posts on forums, blog comments and wikis on websites. The codes supported are HTML, BBcodes and Wiki Codes. The default is BBcode, but you can chose HTML or Wiki code depending on what you want to use it for.
You can also create custom buttons on toolbar, the button created can be saved into files, you can also send the save button to friends to be used by them.
Add-on can be download from the Official webpage