下载地址:

https://ftp.mozilla.org/pub/firefox/releases/47.0/

New

• Embedded YouTube videos now play with HTML5 video if Flash is not installed. Just load and start playing!

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

• Firefox can automagically play videos without any plugins.

  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. Don’t worry, you won’t notice a thing.

  Embedded YouTube videos now play with HTML5 video if Flash is not installed. Just load and start playing!

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

• Enable VP9 video codec for users with fast machines

Changed

• The browser.sessionstore.restore_on_demand preference has been reset to its default value (true) to avoid e10s performance problems. Because faster is better!

• FUEL (Firefox User Extension Library) has been removed. Add-ons relying on it will stop working, so use add-on SDK instead, pretty please!

• The Firefox click-to-activate plugin whitelist has been removed.

Developer

• 'Start' button for service workers in about:debugging to start registered Service Workers

• Allow users to view and debug all the registered Service Workers in about:debugging#workers

• See Firefox run! Review Firefox performance data in about:performance.

• Changes that can affect add-on compatibility

• Added support for ChaCha20/Poly1305 cipher suites

• Tilt is available as extension on AMO

• Functionality in about:debugging to simulate Push messages for testing

• Custom user agents supported in Responsive Design Mode

• Smart multi-line input in the Web Console