Mozilla Firefox 39.0 Beta 4 今日發布于Mozila的FTP，目前官方還沒有發布相關的更新報告，但從面向開發者的信息看，SSLv3被徹底移除出Firefox的支持范圍，并實現對W3C制訂的ARIA規范的支持，這是一個為殘疾人士等提供無障礙訪問動態、可交互Web內容的技術規范，為瀏覽器、媒體播放器、輔助技術的開發人員以及Web內容開發者定義了可以獲得更廣泛跨平臺可訪問性的方法。可見Firefox從現在開始對殘障人士的會更加友好。

下載地址:

Changes for Web developersDeveloper Tools

Highlights:

CSS

Support of the type on list-style-type, as well as its shorthand property list-style has been implemented (bug?1144607).

CSS Scroll Snapping has been implemented (bug?945584 and bug?1138658).

Cascading of CSS Animations and CSS Transitions has been rewritten to match the latest specification (bug?1125455).

Support for vertical scripts, with the writing-mode is now turned on by default on Nightly and Developer Edition, but not on Firefox Beta and Firefox Release (bug?1099032). Note that implementation is not yet complete and some widgets, like tables, will not obey to all values.

HTML

A new ARIA role, switch, is now supported (bug?1136563).

Support for allowing to anticipate a future connection without revealing any information has been implemented (bug?1135160).

JavaScript

The RegExp constructor no longer throws when the first argument is a RegExp and the second flags argument is present (bug?1108949).

The Object.prototype.__noSuchMethod__ property is now deprecated and throws a console warning (see bug?1140428 and this platform announcement).

The implementation of the Proxy object has been updated to comply more with the ES6 specification:

The defineProperty and set handlers now need to explicitly return true to be successful, otherwise a TypeError exception will be thrown in strict mode (bug?1132522).

If the window object is set as the target, those handlers will now throw a TypeError (bug?828137).

When using arrow functions (=>), a line terminator (\n) is no longer allowed after arrow function arguments (() \n => {}) (bug?1141392).

The non-standard flags argument of String.prototype.match(),?String.prototype.search(), and String.prototype.replace() is now deprecated and throws a console warning (bug?1142351).

The try/catch behavior of Object.assign() has been removed to conform with the latest ES6 draft (bug?1103344).

Interfaces/APIs/DOM

The experimental CanvasRenderingContext2D.addHitRegion() method now accepts a path option, which allows you to add hit regions to Path2D objects (bug?1129147).

New methods have been added to manipulate FormData objects (bug?1085283) and FormData are now supported in Web workers (bug?739173).

The non-standard XMLHttpRequest.sendAsBinary() method has been removed (bug?853162).

Progress in our experimental implementation of Web Animations: AnimationPlayer.startTime is now writeable (bug?1073379).

Progress in our experimental implementation of Service Workers: Cache and CacheStorage interfaces are now implemented (bug?940273).

The experimental Fetch API has been activated by default (bug?1133861).

Progress in our experimental implementation of WebGL2: WebGLSync is now implemented (bug?1048721).

MathML

No change.

SVG

No change.

Audio/Video

No change.

Miscelleanous

WOFF2 fonts support is now turned on by default in release version of Firefox (Beta and Release, in addition of Nightly and Developer Edition) (bug?1084026).

Networking

Support for SSLv3 has been completely removed (bug?1106470).

SecurityChanges for add-on and Mozilla developersXUL

No change.

JavaScript code modules

No change.

XPCOM

No change.

Firefox 的詳細介紹：請點這里

Firefox 的下載地址：請點這里

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