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Neue Features:

• Available in more than 70 languages - get your local version.
• Support for a new type of theme called Personas, which allow users to change Firefox's appearance with a single click.
• Protection from out-of-date plugins to keep users safer as they browse.
• Open, native video can now be displayed full screen and supports poster frames.
• Improved JavaScript performance, overall browser responsiveness, and startup time.
• The ability for web developers to indicate that scripts should run asynchronously to speed up page load times.
• Continued support for downloadable web fonts using the new WOFF font format.
• Support for new CSS attributes such as gradients, background sizing, and pointer events.
• Support for new DOM and HTML5 specifications including the Drag & Drop API and the File API, which allow for more interactive web pages.
• Changes to how third-party software can integrate with Firefox in order to prevent crashes.

http://www.mozilla.com/en-US/firefox/3.6/releasenotes/