Open Elements

I ran across this editor while looking for plugins on the mozilla website. Codetch is a plugin for Firefox, which means that the application runs on your web browser! The current version is 0.4.0.
Pros:

Tabs, line numbers, ability to switch between code and live preview, Codetch lives on the web! (no need to open another program)

Cons:

while editing an HTML file, I found the editor a bit slow — meaning that everytime I typed something (e.g. a long sentence), the editor would let me type, but the letters appeared on the screen a few seconds after I typed them.

You can find out more by visiting the official website, http://www.codetch.com

Mario Seijo
web designer
www.openElements.info