Mozilla Firefox 47 今日正式发布，新版最大的新增功能是支持来自谷歌的Widevine CDM流媒体技术，ChaCha20/Poly1305密码套件，并且在符合要求的计算机上开始支持快速启用VP9视频解码器。除此之外，针对Web开发者也有相当大的改进，并带来了几十个安全修补程序，详情可见更新列表。
下载地址:
https://ftp.mozilla.org/pub/firefox/releases/47.0/
New
Embedded YouTube videos now play with HTML5 video if Flash is not installed. Just load and start playing!
Allow no-cache on back/forward navigations for https resources
Firefox can automagically play videos without any plugins.
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. Don’t worry, you won’t notice a thing.
Embedded YouTube videos now play with HTML5 video if Flash is not installed. Just load and start playing!
Embedded YouTube videos now play with HTML5 video if Flash is not installed
Enable VP9 video codec for users with fast machines
Changed
The browser.sessionstore.restore_on_demand preference has been reset to its default value (true) to avoid e10s performance problems. Because faster is better!
FUEL (Firefox User Extension Library) has been removed. Add-ons relying on it will stop working, so use add-on SDK instead, pretty please!
The Firefox click-to-activate plugin whitelist has been removed.
Developer
'Start' button for service workers in about:debugging to start registered Service Workers
Allow users to view and debug all the registered Service Workers in about:debugging#workers
See Firefox run! Review Firefox performance data in about:performance.
Changes that can affect add-on compatibility
Added support for ChaCha20/Poly1305 cipher suites
Tilt is available as extension on AMO
Functionality in about:debugging to simulate Push messages for testing
Custom user agents supported in Responsive Design Mode
Smart multi-line input in the Web Console