Firefox Developer Edition
Release Notes

Improved API support for m4v video playback

WebRTC streaming on multiple monitors

Improved Big5 support for Hong Kong supplementary characters on Windows XP

GTK3 integration (GNU/Linux only)

Eyedropper tool does not work as expected when page is zoomed

Markup view shows indicators for pseudo-classes locked for elements

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

Service worker network interception via FetchEvent enabled

Subresource integrity allows developers to make their sites more secure

Ship Push messaging with disabled web notifications from ServiceWorkers

The CTRL+K shortcut does not give focus to the search field when used from the URL bar on GNU/Linux with GTK+ 3.14 and 3.16 (1176929)