I have always wondered why there were no updates for the SuSE provided Firefox. Looking a bit more carefully at the openSUSE site, I realized that in order to get updates for Firefox, SeaMonkey and Thunderbird, you need to add an additional YaST source.
The base directory for all Mozilla related products on SuSE Linux is http://software.opensuse.org/download/mozilla/.
You can add the correct path for your Linux distribution from there.
For example the openSUSE 10.2 the source URL is http://software.opensuse.org/download/mozilla/openSUSE_10.2/.
As far as I am concerned, there are more good news as I realised that the base address also offers versions for SLES9 and SLES10.