官方版本55.0预计在 2017年08月08日(美国时间) 台湾时间08月09日 更新
https://wiki.mozilla.org/RapidRelease/Calendar#Future_branch_dates
更新日志
https://www.mozilla.org/en-US/firefox/54.0/releasenotes/
new：
Simplified the download button and download status panel
Added support for multiple content processes (e10s-multi)
http://tinyurl.com/jazd4e5
Added Burmese (my) locale
fixed：
Various security fixes
https://www.mozilla.org/en-US/security/known-vulnerabilities/firefox/#firefox54
changed：
Moved the mobile bookmarks folder to the main bookmarks menu for easier
access
Developer：
Added ability to create and save custom devices in Responsive Design Mode
http://tinyurl.com/yc63my3g
Additional changes for web developers
https://developer.mozilla.org/en-US/Firefox/Releases/54
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-54.0&lang=zh-TW&os=win
Mozilla的FTP服务器:
http://ftp.mozilla.org/pub/firefox/releases/
Unbranded版本︰
https://wiki.mozilla.org/Add-ons/Extension_Signing#Unbranded_Builds