Mozilla recently announced the release of Firefox 43.0 Beta 1, which comes with a number of new features and improvements. One notable feature is GTK3 integration (GNU/Linux only) and automatic showing of the on-screen touch keyboard on Windows 8 and higher.
Other New Features:
Improved API support for m4v video playback 1
Search suggestions can be displayed in the Awesome Bar
WebRTC streaming on multiple monitors
User selectable second block list for Private Browsing’s Tracking Protection
Bind F1 key to open the settings when the toolbox is focused
New ‘Use in Console’ context menu item in Inspector to store selected element in a temporary variable
Search button next to overridden CSS properties to find similar properties in the rules view
Ability to filter styles from their property names in the rules view
Stack traces are now shown for exceptions inside the console
Added ability to display server-side logs in the console
Ability to choose resolution for the GCLI screenshot command
Subresource integrity allows developers to make their sites more secure
Network requests in Console now link to Network panel instead of opening in a popup
Unprefixed ‘hyphens’ property is now supported
WebIDE now has a sidebar-based UI
The ‘transform-origin’ property is now supported on SVG elements
Animation inspector now displays animations in a timeline
Markup view shows indicators for pseudo-classes locked for elements
Eyedropper tool does not work as expected when page is zoomed
For more information, see the official changelog for yourself.
To install just run the following commands via your systems Terminal.