Firefox 14 for developers

• <progress>元素不在错误的归为一个表单元素，因此不再有一个form属性。
• The default modifier keys for the accesskey of HTML contents on Mac are changed to Control+Option. This is the same as WebKit-based browsers on Mac.

• input events are fired also on editing host element of contenteditable editor and root element of designMode editor.
• DOMException.code已被废弃，根据最新的 DOM Level 4 规范。
• Range.insertNode() method now works correctly when used on collapsed ranges.
• The MozBlobBuilder interface has been deprecated in favor of the constructor on Blob. If you use MozBlobBuilder you'll see a warning message in the Web Console.
• The Blob() constructor is now available to workers (Firefox bug 736686).
• Support for the Mutation Observers has been landed. It is designed as a replacement for the Mutation Events in DOM3, which has a number of issues regarding performance.
• The HTMLImageElement interface's x and y properties were removed in Gecko 7.0 but restored in this release for compatibility reasons.
• Document上的方法execCommandShowHelp()和queryCommandText(),没有任何作用，已被删除。
• The GeoPositionAddress interface, an obsolete part of the Geolocation API, has been removed.
• localStorage/sessionStorage now correctly return undefined instead of null for undeclared keys through property access.
• The ImageData object has been implemented (Firefox bug 550309).
• Attributes and methods related to child nodes on Attr interface where obsoleted (Firefox bug 737122).

• The text-transform and font-variant CSS properties have been fixed to correctly handle the i → İ and ı → I Turkic-specific case pairs.
• The Dutch IJ digraph is now correctly handled by text-transform: capitalization. Similarly the Greek letter Σ, which has two lowercase forms, σ and ς, is now correctly handled by text-transform: lowercase.
• Support for the skew() function has been removed from transform property, as it has been removed from the draft standard.
• The syntax for border-image has been updated to match the latest revision of the specification; it no longer accepts a trailing slash ("/").

No change.

• The syntax of the statusline action type on <maction> elements has been adjusted to follow the MathML specification.

• Gecko 开始支持新的HTTP 308 永久重定向 状态码。由于 Gecko 并不区分永久重定向和临时重定向，所以该状态码的表现行为和307 临时重定向状态码是一样的，和 302 以及 301 状态码的区别是，它们禁止用户代理改变重定之后的 HTTP 方法 (POST 还是 POST, GET 还是 GET).

source-editor.jsm

• Added a keyboard shortcut to toggle commenting for the current selection (Ctrl-/ or Cmd-/ on Mac OS X).
• Added the Ctrl-[ and Ctrl-] keyboard shortcuts for moving the text input position to the beginning and end of the current block.
• Added the new getLineStart() and getLineEnd() methods.

• 在 <window> 元素上添加了新的 fullscreenbutton 属性；将该属性设置为true，会在窗口上添加一个进入全屏模式的按钮。

• nsILocalFile接口被合并到nsIFile接口中。(bug 682360).
• The methods in nsIPlacesImportExportService for importing bookmarks have all been removed in favor of the BookmarkHTMLUtils.jsm JavaScript code module.
• nsIDOMGeoPositionAddress 接口已被移除。

• Dictionary names are now parsed as full BCP 47 language tags (bug 730209, bug 741842). Developers are encouraged to not hard-code the name of their language in their dictionary names.