Features for Developers (Firefox 3.1 beta 1)

Okey, this should be a good news.
Geolocation

Geolocation is a that lets a web page the ’s location via JavaScript. It can be used to plot , give directions, attach location information to pictures, give a location for a weblog post and a pile of other things.
More details about Geolocation API Specification.

@-face

Add support for the @font-face property. This property allows you to specify a true type font that includes a specific font you want to use to render a web page.
More details about @font-face

and

Include support for the and elements. This beta includes support for the OGG Theora and OGG Vorbis formats on all platforms

And more…