See what’s new in Firefox!

Release Notes tell you what’s new in Firefox. As always, we welcome your feedback. You can also file a bug in Bugzilla or see the system requirements of this release.

44.0a2

Firefox Developer Edition

November 3, 2015

Version 44.0a2, first offered to Firefox Developer Edition channel users on November 3, 2015

New

  • Improved warning pages for certificate errors and untrusted connections

Changed

  • Firefox has removed support for the RC4 cipher

Developer

  • Visual tools for Animation:

    • View/Edit CSS animation keyframe rules directly in the inspector
    • Visually modify the cubic-bezier curve that drives the way animations progress through time
    • Discover and scrub through all CSS animations and transitions playing on the page
    • Learn more: http://devtoolschallenger.com/
  • Visual tools for Layout and Styles:

    • Display rulers along the viewport to verify size and position and use the measurement tool to easily detect spacing and alignment problems
    • Use CSS filters to preview and create real-time effects like drop-shadows, sepia, etc
    • Learn more: http://devtoolschallenger.com/
  • New memory tool for inspecting the memory heap

  • Service Workers API

  • Built-in JSON reader to intuitively view, search, copy and save data without extensions

  • Right click on a logged object in the console to store it as a global variable on the page

  • Add-on signing enforcement

Developer Information