Backports.org has released a backport of Mozilla Firefox 0.8 for Debian GNU/Linux 3.0

Firefox is an award winning preview of next generation browsing technology from mozilla.org.

Firefox empowers you to accomplish your online activities faster, more safely and efficiently than any other browser, period. Built with Tab browsing, popup blocking and a number of other seamless innovations, Firefox stands out ahead.

Here the APT source:

# Mozilla Firefox
deb http://www.backports.org/debian stable mozilla-firefox
deb-src http://www.backports.org/debian stable mozilla-firefox