What’s new in Firefox 3.6:

Below are some of the coolest features of Firefox 3.6:

• Personas: Personalize the look of your Firefox by selecting new themes called Personas in a single click and without a restart
• Plugin Updater: To keep you safe from potential security vulnerabilities, Firefox will now detect out of date plugins
• Stability improvements: Firefox 3.6 significantly decreased crashes caused by third party software – all without sacrificing our extensibility in any way
• Form Complete: When filling out an online form, Firefox suggests information for fields based on your common answers in similar field
• Performance: Improved JavaScript performance, overall browser responsiveness, and startup time
• Open Video and Audio: With the world’s best implementation of HTML 5 audio and video support, now video can be displayed full screen and supports poster frames

What’s New Under the Hood for Developers

• Support for the latest HTML5 specification, including the File API for local file handling
• Font Support: In addition to OpenType and TrueType fonts, 3.6 now supports the new Web Open Font Format (WOFF)
• CSS gradients: Supports linear and radial CSS gradients which allow for a smoother transition between colors
• Device orientation: Firefox 3.6 exposes the orientation of the laptop or device to Web pages

more….

@font-face
{
font-family:Zawgyi-one;
src:url(http://www.saturngod.net/ZawgyiOne2008.ttf);
}

That is example and I am calling Zawgyi-one font to embed. You can read more detial in mozilla developer page