Not sure of the answer since I don't use Suse.
However I wanted to point out there is a 1.5.0.7 available with security fixes from
www.mozilla.org itself. You probably want to install that rather than the 1.5.0.6.x version anyway.
Point your firefox browser at
www.mozilla.org and choose firefox from there. It should put you right at a link for a download to the Linux updated version.