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除了ESR扩展支持版本分支之外的所有旧版本将不会再对XP与Vista提供支持，ESR的支持周期降到2018年年中结束，旧版系统用户使用期间将只能获取到安全修补程序，不会再有任何功能上的改进。
New
Lightweight themes are now applied in private browsing windows
Reader Mode now displays estimated reading time for the page
On qualified Windows systems, a new 'compositor process' mitigates the risk of device driver related browser crashes
Windows users can select 32-bit or 64-bit versions in the installer
Two new 'compact' themes available in Firefox, dark and light, based on the Firefox Developer Edition theme
Changed
Windows XP and Vista are no longer supported. XP and Vista users running Firefox 52 will continue to receive security updates for another year.
32-bit Mac OS X is no longer supported. Firefox is now a 64-bit only Mac OS X application
Updates for Mac OS X are smaller in size compared to updates for Firefox 52
Media playback on new tabs is blocked until the tab is visible
Permission notifications have a cleaner design and cannot be easily missed
Shortened titles on tabs are faded out instead of using ellipsis for improved readability
Refresh of the media controls user interface
Ended Firefox Linux support for processors older than Pentium 4 and AMD Opteron
Developer
Support for WebM video with alpha, which allows playing videos with transparent backgrounds
Changes for web developers
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