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Mozilla WebMaker is a project to help people get into Internet literacy. The Web is the new main communication media and as you might settle to know how to read and watch content from the Web, you might say you are illiterate if you don’t know how to build and publish content for others yourself, how the browser technologies work and how you can take advantage of it all.
One of the WebMaker projects is the Popcorn Maker. This Web based tool makes it easy to use your web browser to combine video and audio with content from the rest of the web — from text, links and maps to pictures and live feeds. Mozilla Chief Operating Officer, Ryan Merkley makes a really good presentation about what Popcorn is all about:

Each time someone watches the videos, it’s a point in time experience because the live feeds are updated in real time and consequentially the content is different than previous moments.

Browser developer tools are a must have for Web developers to debug and solve compatibility issues. Firefox makes developing for the Web faster and easier with a unique Developer Command Line. The new tool provides easy keyboard control over Firefox Developer Tools and is intuitive, completing commands and parameters for you.
In addition, Firefox unprefixes a number of stable features including: CSS3 Animations, Transitions, Transforms, Image Values, IndexedDB and Values and Units. Firefox also unprefixes Battery API and Vibration API, two Web APIs that Mozilla helped create.


Source: Firefox Debuts New Developer Toolbar