Firefox 44 released


Improved warning pages for certificate errors and untrusted connections

Enable H.264 if system decoder is available

Enable WebM/VP9 video support on systems that don’t support MP4/H.264


Windows XP and Vista screensaver doesn’t disable when watching videos (Bug 1193610)


To support unicode-range descriptor for webfonts, font matching under Linux now uses the same font matching code as other platforms

Use a SHA-256 signing certificate for Windows builds, to meet new signing requirements

Firefox has removed support for the RC4 decipher

Firefox will no longer trust the Equifax Secure Certificate Authority 1024-bit root certificate or the UTN – DATACorp SGC to validate secure website certificates


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

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:

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:

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

Jump to function definitions in the debugger with Cmd-Click

WebSocket Debugging API and add-on

The rule view now displays styles using their authored text,and edits in the rule view are now linked to the style editor

Add-on signing enforcement

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