Mozilla Thimble is an online application that lets kids remix webpage projects and complete their own. Thimble is part of Mozilla's Webmaker.org, which is a site dedicated to making it easy and fun for kids to learn how the Web works and how kids can "write" or make their own digital content online. Kids will need a "Persona" account from Mozilla to log in to Thimble and save work, but all that's required for a Persona account is an email address. Kids can publish the projects and webpages they complete, and Thimble will give them a web address to view and share their projects.