Firefox 27 beta 发布，提供同时的 Social API 提醒，TLS 1.2 支持以及 Android 平台上更多语言的版本。 桌面版本更详细的改进记录包括（发行说明）： - NEW: You can now run more than one service at a time with Firefox SocialAPI, allowing you to receive notifications, chat and more from multiple integrated services.
- NEW: Implemented support for TLS 1.2 (RFC 5246).
- CHANGED: Added support for SPDY 3.1 protocol.
- DEVELOPER: Ability to reset style sheets using ‘all:unset’.
- DEVELOPER: You can now choose to deobfuscate javascript in the debugger (see762761).
- DEVELOPER: Added support for scrolled fieldsets (see 261037).
- DEVELOPER: Implemented allow-popups directive for iframe sandbox, enabling increased security (see 766282).
- DEVELOPER: CSS cursor keywords -moz-grab and -moz-grabbing have been unprefixed (see 880672).
- DEVELOPER: Added support for ES6 generators in SpiderMonkey (see blog post).
- DEVELOPER: Implemented support for mathematical function Math.hypot() in ES6 (see896264).
- HTML5: Dashed line support on Canvas (see 768067).
- FIXED: Get Azure/Skia content rendering working on Linux (see 762761).
Firefox beta for Android 改进记录（发行说明）: - NEW: Added Lithuanian, Slovenian, South African English and Thai to android multi-locale builds.
- NEW: Implemented support for TLS 1.2 (RFC 5246).
- CHANGED: UI improvements due to rewrite of favicon system (see 914296).
- CHANGED: Removed overscrolling on web content (see 705246).
- CHANGED: Experience better readability with default font set to Clear Sans.
- DEVELOPER: Ability to reset style sheets using ‘all:unset’.
- DEVELOPER: You can now choose to deobfuscate javascript in the debugger (see762761).
- DEVELOPER: Implemented allow-popups directive for iframe sandbox, enabling increased security (see 766282).
- DEVELOPER: CSS cursor keywords -moz-grab and -moz-grabbing have been unprefixed (see 880672).
- DEVELOPER: Added support for ES6 generators in SpiderMonkey (see blog post).
- DEVELOPER: Implemented support for mathematical function Math.hypot() in ES6 (see896264).
- HTML5: Dashed line support on Canvas (see 768067).
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