1.能够从Google Chrome 中直接导入书签、历史记录和Cookies;
2.支持扩展随Sync启动后同时同步;
3.支持CSS文本大小调整属性(text-size-adjust property);
4.新增对outerHTML属性的支持;

Firefox can now migrate your bookmarks, history, and cookies from Google Chrome
With Sync enabled, add-ons can now be synchronized across your computers
The CSS text-size-adjust property is now supported
The outerHTML property is now supported on HTML elements
View source syntax highlighting now uses the HTML5 parser (see bug 482921)
The Style Editor for CSS editing is now available to web developers
Web developers can now visualize a web page in 3D using the Page Inspector 3D View
SPDY protocol support for faster page loads is now testable
XMLHttpRequest now supports HTML parsing
Files can now be stored in IndexedDB (see bug 661877)
Websockets has now been unprefixed
Redesigned media controls for HTML5 video
Firefox notifications may not work properly with Growl 1.3 or later (691662)