Popcorn Maker was an app that I founded and project managed at Mozilla as part of our Webmaker initiative. Based on the highly popular popcorn.js open source video library that we created with the Center for Open Technology at Seneca College, Popcorn Maker allowed anyone to remix videos they found on the web and combine them with other rich media. It was called "The Future of Online Video" by FastCompany, and reached about 250,000 users - mostly remix artists and media educations. After shifting strategic direction in 2015, Mozilla stopped actively supporting the project.
However, the open source code found a new home at the Internet Archive, where today it powers their editing experience.