New Developer Toolbar on Mozilla Firefox

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