Mozilla Firefox 38.0今日发布，除了继续优化对64位的支持，增加了对HTML 5的支持改进，带来了新的基于标签的设置界面，最大的改进是原生支持Ruby字符。Ruby字符与Ruby语言无关，而是注音标示，是一种表意文字的音标印刷方式，广泛地运用于日文及中文，rubi是日本印刷业的用语。以前 Firefox浏览器支持注音标示需要安装扩展如HTML Ruby，如今Firefox 38默认启用了CSS Ruby，同时还引入了HTML5 ruby标签支持。
What’s New
New
New tab-based preferences
New
Ruby annotation support
New
Share the active tab or window in a Hello conversation - enabled for first half of the beta cycle
New
Keep track of articles and blog posts with the Reading List - enabled for the first half of the beta cycle
New
Base for the next ESR release.
Changed
autocomplete=off is no longer supported for username/password fields
Changed
RegExp.prototype.source now returns "(?:)" instead of the empty string for empty regular expressions
Changed
Improved page load times via speculative connection warmup
HTML5
WebSocket now available in Web Workers
HTML5
Implemented srcset attribute and <picture> element for responsive images
HTML5
Implemented DOM3 Events KeyboardEvent.code
HTML5
Mac OS X: Implemented a subset of the Media Source Extensions (MSE) API to allow native HTML5 playback on YouTube
HTML5
HTML5
Implemented Encrypted Media Extensions (EME) API to support encrypted HTML5 video/audio playback (Windows Vista or later only)
HTML5
Automatically download Adobe Primetime Content Decryption Module (CDM) for DRM playback through EME (Windows Vista or later only)
Developer
Optimized-out variables are now visible in Debugger UI
Developer
XMLHttpRequest logs in the web console are now visually labelled and can be filtered separately from regular network requests
Developer
WebRTC now has multistream and renegotiation support
Developer
copycommand added to console
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