官方版本48.0预计在 2016年8月2日(美国时间) 台湾时间8月3日 更新
https://zh.wikipedia.org/wiki/Firefox%E7%89%88%E6%9C%AC%E5%8E%86%E5%8F%B2
更新日志
https://www.mozilla.org/en-US/firefox/47.0/releasenotes/
new：
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.
Enable VP9 video codec for users with fast machines
Embedded YouTube videos now play with HTML5 video if Flash is not
installed.
View and search open tabs from your smartphone or another computer in a
sidebar
Allow no-cache on back/forward navigations for https resources
Latgalu [ltg] locale added. Wikipedia tells us there are 164,500 daily
speakers.
fixed：
Various security fixes
https://goo.gl/Ci5oI8
changed：
FUEL (Firefox User Extension Library) has been removed. Add-ons relying
on it will stop working.
The browser.sessionstore.restore_on_demand preference has been reset to
its default value (true) to avoid e10s performance problems. Because faster
is better!
https://support.mozilla.org/kb/allow-firefox-load-multiple-tabs-multiprocess
The Firefox click-to-activate plugin whitelist has been removed.
https://goo.gl/BkugE4
developer：
Web platform changes
https://goo.gl/hsCk2W
View, start,and debug registered Service Workers in the Service Workers
developer tool
Simulate Push messages in the Service Workers developer tool
'Start' button for service workers in about:debugging to start registered
Service Workers
Changes that can affect add-on compatibility
https://blog.mozilla.org/addons/2016/04/07/compatibility-for-firefox-47/
Added support for ChaCha20/Poly1305 cipher suites
Custom user agents supported in Responsive Design Mode
Smart multi-line input in the Web Console
Developer Information：
https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/47
html5：
cuechange events are now available on TextTrack objects
https://goo.gl/DJMkQ5
WebCrypto: PBKDF2 supports SHA-2 hash algorithms
WebCrypto: RSA-PSS signature support
官方载点:
http://mozilla.com.tw/firefox/download/?os=win&install=full
另一个载点:
http://download.mozilla.org/?product=firefox-47.0&lang=zh-TW&os=win
Mozilla的FTP服务器:
http://ftp.mozilla.org/pub/firefox/releases/
前两个载点似乎都会出现 http://imgur.com/CFGjBr5 您的连线并不安全
还是先用手动更新【说明】->【关于Firefox】 更新
或者利用FTP下载吧!