Thimble was a browser-based code editor for teaching and learning HTML, CSS, and JavaScript. Through our partnership with Glitch, users migrated Thimble projects to the Glitch platform in 2019.


This project was part of a broader movement for a healthy internet. See more.

Thimble logo

Thimble was an open-source project created by Mozilla in partnership with CDOT at Seneca College. Since its inception, Thimble contributors from all over the world played an important role in making it a success. More than 350 contributors from over 30 countries localized Thimble into 33 languages. Thimble had active users in scores of countries.

Thimble contributors

Jerry Goguette in Canada. Jerry writes: “When first starting on Thimble I had little to no experience/knowledge of JavaScript. It took me a while to get my bearings. As I started working on this project I had many hurdles to cross. But with the help of the core team I was able to slowly cross those hurdles. I still have lots to learn, but I'm happy with the progress so far!”

Sana Riaz in Pakistan. Sana writes: “We all need people who will give us feedback. That's how we improve. Working with Thimble was the most encouraging experience for me in open source world and it gave me a chance to work with most friendly and supporting team.”

Ray Gervais. Ray writes: “Contributing to Thimble enabled me to learn about modern JavaScript web applications, an experience which has already helped further my career to new heights and possibilities. Open Source has changed the world, and with it, I believe we can do anything.”

Harkirat Singh in India. Harkirat writes: “Working on Thimble has been a great experience. The code is very well written and the mentors are really supportive. It is one of the best projects to work in if you want to start working on open source and contributing has taught me a lot about open source best practices.”

This is part of a broader movement for a healthy internet. See more.