Firedocs is a Web Authoring Add-on for the Firefox Browser. It is based on a generic editing platform for HTML, XML and text documents. A plug-in concept allows to add special GUI elements and extra functionality for editing particular document types.
Firedocs can be used as:
The base installation has HTML and XHTML support and a source editor for all other document types. It works with Atompub, WebDAV, FTP (via FireFTP) and local files.
Screenshots - Features - Give it a try