Firefox 31 for developers

No change.

• CSS 变量的语法从旧的 "var-" 前缀更新为新的 "--" 前缀。（Firefox bug 985838）
• Unwanted white space for multiple of 10,000 in Korean counte.(Firefox bug 985186)

No change.

实现了如下 ECMAScript 6 新特性：

• Array 方法：Array.prototype.fill() (Firefox bug 911147)
• Math 函数：Math.clz32() (Firefox bug 925123)
• String 方法：String.prototype.normalize() (Firefox bug 918987).

• Constructor of KeyboardEvent has been implemented (Firefox bug 930893).
• KeyboardEvent.initKeyboardEvent() has been implemented (Firefox bug 930893).
• KeyboardEvent.isComposing attribute has been implemented (Firefox bug 993234).
• InputEvent interface has been implemented (Firefox bug 993253).
• InputEvent.isComposing attribute has been implemented (Firefox bug 993253).

No change.

No change.

No change.

No change.

No change.

• Site Compatibility for Firefox 31