Firefox 15.0 Beta 1

# NEW
- Preliminary native PDF support (Aurora/Beta only)
- Support for SPDY networking protocol v3
- WebGL enhancements, including compressed textures for better performance
# CHANGED
- Optimized memory usage for add-ons
# DEVELOPER
- JavaScript debugger integrated into developer tools
- New layout view added to Inspector
- The CSS word-break property has been implemented.
- High precision event timer implemented
- New responsive design tool allows web developers to switch between desktop and mobile views of sites
# HTML5
- Native support for the Opus audio codec added
- The <source> element now supports the media attribute
- The <audio> and <video> elements now support the played attribute