Mozilla developers have released a brand new beta of their Firefox web browser for both desktops and mobile devices.

New features on the desktop edition:

Developer Toolbar: Firefox Beta introduces a new way to access Firefox Developer Tools. Selecting “Developer Toolbar” on the Web Developer menu of your Firefox toolbar will bring up a bar at the bottom of the screen that provides quick and easy access to all the Firefox Developer Tools. A unique-to-Firefox command line allows you to rapidly control your tools without removing your hands from the keyboard.
Unprefixing of Stable CSS4 Features: Developers no longer need to add vendor prefixes for CSS3 Animations, Transitions, Transforms, Image Values, Values & Units and IndexedDB. Firefox Beta also unprefixes Battery API and Vibration API, two Web APIs that Mozilla helped create.

New features on the Android edition:

Reader Mode: Firefox for Android Beta makes it easier to view and read website articles with Reader Mode. When viewing articles and stories on text-heavy pages like news sites and blogs, tapping the “Reader” icon in the Awesome Bar will activate Reader Mode. Reader Mode removes advertisements, reformats pictures and increases font size to show a clearer view of what you’re reading. Reader Mode also lets you share the pages you are reading over Bluetooth, email and SMS with the Share button on the bottom right of the screen.