The new release including new features and changes in the desktop version of Firefox and the Firefox version for Android.
New
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Improved warning pages for certificate errors and untrusted connections
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Enable H.264 if system decoder is available
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Enable WebM/VP9 video support on systems that don't support MP4/H.264
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In the animation-inspector timeline, lightning bolt icon next to animations running on the compositor thread
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Support the brotli compression format via HTTPS content-encoding
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Screenshot commands allow user choice of pixel ratio in Developer Tools
Changed
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To support unicode-range descriptor for webfonts, font matching under Linux now uses the same font matching code as other platforms
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Use a SHA-256 signing certificate for Windows builds, to meet new signing requirements
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Firefox has removed support for the RC4 decipher
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Firefox will no longer trust the Equifax Secure Certificate Authority 1024-bit root certificate or the UTN - DATACorp SGC to validate secure website certificates
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Stricter validation of web fonts
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On-screen keyboard support temporarily turned off for Windows 8 and Windows 8.1