官方版本51.0預計在 2017年01月24日(美國時間) 台灣時間01月25日 更新
50.1.0 2016 12 13 12 14
https://wiki.mozilla.org/RapidRelease/Calendar#Future_branch_dates
更新日誌
https://www.mozilla.org/en-US/firefox/50.0/releasenotes/
new：
Updates to keyboard shortcuts
Set a preference to have Ctrl+Tab cycle through tabs in recently used order
View a page in Reader Mode by using Ctrl+Alt+R (command+alt+r on Mac)
Added option to Find in page that allows users to limit search to whole words
only
Added Guarani (gn) locale
Increased availability of WebGL to more than 98 percent of users on Windows 7
and newer
Added download protection for a large number of executable file types on
Windows, Mac and Linux
https://hg.mozilla.org/mozilla-central/file/054d4856cea6/toolkit/components/downloads/ApplicationReputation.cpp#l399
Improved performance for SDK extensions or extensions using the SDK module
loader
Playback video on more sites without plugins with WebM EME Support for
Widevine on Windows and Mac
Fixed：
Fixed rendering of dashed and dotted borders with rounded corners
(border-radius)
https://developer.mozilla.org/en-US/docs/Web/CSS/border-radius
Various security fixes
https://www.mozilla.org/en-US/security/known-vulnerabilities/firefox/#firefox50
changed：
Added a built-in Emoji set for operating systems without native Emoji fonts
(Windows 8.0 and lower and Linux)
Blocked versions of libavcodec older than 54.35.1
developer：
https://developer.mozilla.org/zh-TW/Firefox/Releases/50#Changes_for_Web_developers
官方載點:
http://mozilla.com.tw/firefox/download/?os=win&install=full
另一個載點:
http://download.mozilla.org/?product=firefox-50.0&lang=zh-TW&os=win
Mozilla的FTP伺服器:
http://ftp.mozilla.org/pub/firefox/releases/
Unbranded版本︰
https://wiki.mozilla.org/Add-ons/Extension_Signing#Unbranded_Builds
以下是在Firefox的「擴充套件」上看不到，CCleaner的「瀏覽器外掛程式」上有顯示
Application Update Service Helper(之前沒注意到，這版才注意到!)
Multi-process staged rollout
Pocket
Web Compat
共四項