Mozilla Thimble is a new web-based code editor, part of the company’s recently unveiled
Webmakers project. Thimble is designed to give novice webmakers an easy-to-use online tool to quickly build and share webpages.
You can check out Thimble over at the new Mozilla Thimble website. Keep in mind that Mozilla hasn’t formally launched Thimble; the company is still testing, fixing bugs and iterating the app — via Webmonkey