[Soft] Mozilla:Flashがインストールされていない場合HTML5ビデオを再生する次期Webブラウザー「Firefox 47 beta」リリース

Firefox betaSoft

Mozilla より、Flashがインストールされていない場合HTML5ビデオを再生する次期Webブラウザー「Firefox 47 beta」がリリースされています。




YouTubeの組み込み動画を見る場合、Flashがインストールされていない場合HTML5ビデオを再生するほか、GoogleのWidevine CDMをサポートなどが含まれています。


Firefox 47 beta 新機能


  • Embedded YouTube videos now play with HTML5 video if Flash is not installed
  • Added support for ChaCha20/Poly1305 cipher suites
  • Support for Google’s Widevine CDM on Windows and Mac OS X.
  • Enable VP9 video codec for users with fast machines
  • New Devtools for Service Workers adds a button to start registered SWs
  • Allow users to view and debug all the registered SWs in about:debugging#workers
  • Functionality in about:debugging to simulate Push messages for testing
  • Smart multi-line input in the Web Console
  • Review Firefox performance data in about:performance
  • WebCrypto: RSA-PSS signature support
  • Allow no-cache on back/forward navigations for https resources


  • The browser.sessionstore.restore_on_demand preference has been reset to its default value (true) to avoid e10s performance problems
  • WebCrypto: PBKDF2 supports SHA-2 hash algorithms
  • “FUEL (Firefox User Extension Library) has been removed, add-ons relying on it will stop working, use add-on SDK instead.“


  • Changes that can affect add-on compatibility
  • cuechange events are now available on TextTrack objects
  • Tilt removed from Firefox Developer Tools
  • Custom user agents supported in Responsive Design Mode
  • Implemented Document.scrollingElement to tell which element’s scroll attributes reflect the viewport scroll state



Mozilla Firefox Web Browser — Firefox Developer Edition もしくは Beta を利用して、Firefox の新機能をいち早く試そう — Mozilla