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.
47.0beta
Firefox Beta
April 27, 2016
Version 47.0beta, first offered to Beta channel users on April 27, 2016
New
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Support for Google’s Widevine CDM on Windows and Mac OS X so streaming services like Amazon Video can switch from Silverlight to encrypted HTML5 video.
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Enable VP9 video codec for users with fast machines
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Embedded YouTube videos now play with HTML5 video if Flash is not installed.
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Allow no-cache on back/forward navigations for https resources
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Embedded YouTube videos now play with HTML5 video if Flash is not installed
Changed
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FUEL (Firefox User Extension Library) has been removed. Add-ons relying on it will stop working.
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The browser.sessionstore.restore_on_demand preference has been reset to its default value (true) to avoid e10s performance problems. Because faster is better!
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The Firefox click-to-activate plugin whitelist has been removed.
Developer
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See Firefox run! Review Firefox performance data in about:performance.
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Smart multi-line input in the Web Console
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Custom user agents supported in Responsive Design Mode
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Simulate Push messages in the Service Workers developer tool
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View, start,and debug registered Service Workers in the Service Workers developer tool
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'Start' button for service workers in about:debugging to start registered Service Workers
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Tilt is available as extension on AMO
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Added support for ChaCha20/Poly1305 cipher suites
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Changes that can affect add-on compatibility
HTML5
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WebCrypto: RSA-PSS signature support
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WebCrypto: PBKDF2 supports SHA-2 hash algorithms
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cuechange events are now available on TextTrack objects
