Firefox 44.0

What's new in this version:

New:
- 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
- In the animation-inspector timeline, lightning bolt icon next to animations running on the compositor thread
- Support the brotli compression format via HTTPS content-encoding
- Screenshot commands allow user choice of pixel ratio in Developer Tools

Fixed:
- Windows XP and Vista screensaver doesn't disable when watching videos (Bug 1193610)
- Various security fixes

Changed:
- 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
- Stricter validation of web fonts
- On-screen keyboard support temporarily turned off for Windows 8 and Windows 8.1

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

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
- 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.

Security fixes:
- 2016-12 Lightweight themes on Firefox for Android do not verify a secure connection
- 2016-11 Application Reputation service disabled in Firefox 43
- 2016-10 Unsafe memory manipulation found through code inspection
- 2016-09 Addressbar spoofing attacks
- 2016-08 Delay following click events in file download dialog too short on OS X
- 2016-07 Errors in mp_div and mp_exptmod cryptographic functions in NSS
- 2016-06 Missing delay following user click events in protocol handler dialog
- 2016-05 Addressbar spoofing through stored data url shortcuts on Firefox for Android
- 2016-04 Firefox allows for control characters to be set in cookie names
- 2016-03 Buffer overflow in WebGL after out of memory allocation
- 2016-02 Out of Memory crash when parsing GIF format images
- 2016-01 Miscellaneous memory safety hazards (rv:44.0 / rv:38.6)