These extensions somehow change the text in form controls. * vian Fx 1.5 - 3.5.* (vi for text inputs and presumably textareas) * Text Formatting Toolbar Fx 2.0 - 3.6a1pre * Weekedit Fx 1.5 - 3.7a6pre (seems like Greasemonkey for wikis) These offer a WYSIWYG interface and output to a textarea: * BBComposer Fx 1.0 - 4.0.* * Write Area Fx 3.6 - 4.0.* * Xinha Here! Fx 1.0 - 3.6.* * SourceEditor Fx 1.0 - 3.0.*