Are you still looking for5 this information or have you been able to upgrade? I think that in general if the RPM isn't provided by Novell then there isn't going to be one for SLES that we would recommend.
Novell has just released SLES10 SP3:
http://www.novell.com/news/press/novell-announces-availability-of-suse-linux-enterprise-10-service-pack-3/
It looks like in SLES10 SP3 the Firefox version for PPC was updated to 3.5:
MozillaFirefox-3.5.2-3.4.8.ppc.rpm
Thus, this may be one avenue for you to get your system upgraded to an more recent version of Firefox if you are looking for a Novell rpm supported method. If you need a more recent version of Firefox then you may have to donwload and install directly from Mozilla's web site.
-Thanks.
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