Mozilla今天宣布了其支持WebM特性的浏览器预览(1.9.3 Number 5)版本可以工作在Mac, Windows和Linux下，并支持32和64位版本，新版带来了WebM支持、HTML5视频全屏播放和一系列HTML5的表格、数据新特性，并进一步提升了JS性能，以下是更新列表和下载信息：
查看:Mozilla Developer Preview (1.9.3 Number 5)
User-facing changes
- Aero Glass is now enabled for Windows Vista and Windows 7.
- More parts of the new Windows theme have landed including new main button icons. Many more changes are coming in later releases.
- The new Add-ons manager has landed. The UI for the new Add-ons manager is not yet complete.
- You can now put tabs on top (View -> Toolbars -> Tabs on Top) although without most of the final UI this isn’t as useful as it could be.
Web-facing changes
- Support for WebM is included with this build. (Try an example video on Youtube.)
- When viewing HTML5 videos in full screen, we now use hardware acceleration for Windows (DX9) and Macs (OpenGL).
- This is the first release of any browser that has proper support for parsing HTML5 according to the specification.
- This build has early support for some HTML5 forms.
- We now support the FormData