Mozilla Firefox 47 Beta 1 昨日已经发布到Mozilla的FTP公共beta测试频道，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/47.0b1/

New

Embedded YouTube videos now play with HTML5 video if Flash is not installed

Added support for ChaCha20/Poly1305 cipher suites

Support for Google’s Widevine CDM on Windows and Mac OS X.

Enable VP9 video codec for users with fast machines

New Devtools for Service Workers adds a button to start registered SWs

Allow users to view and debug all the registered SWs in about:debugging#workers

Functionality in about:debugging to simulate Push messages for testing

Smart multi-line input in the Web Console

Review Firefox performance data in about:performance

WebCrypto: RSA-PSS signature support

Allow no-cache on back/forward navigations for https resources

Changed

The browser.sessionstore.restore_on_demand preference has been reset to its default value (true) to avoid e10s performance problems

WebCrypto: PBKDF2 supports SHA-2 hash algorithms

“FUEL (Firefox User Extension Library) has been removed, add-ons relying on it will stop working, use add-on SDK instead.“

Developer

Changes that can affect add-on compatibility

cuechange events are now available on TextTrack objects

Tilt removed from Firefox Developer Tools

Custom user agents supported in Responsive Design Mode

Implemented Document.scrollingElement to tell which element's scroll attributes reflect the viewport scroll state