Changing component to Firefox.
Michal has been able to confirm that the patch attached to the upstream bug fixes the issue on ppc.
Changing platform to powerpc, to indicate this is a platform specific bug.
This bug is for RHEL 5.x. I've filed a clone for the same issue on RHEL 4.x, bug 466980. This bug is ONLY for TRACKING. The real fix will get included (hopefully) with an upstream fix, and can be shipped as part of the next future Firefox update (probably 3.0.4).
Upstream is marked as fixed by Firefox 3.0.4, which has been shipped into RHEL 5 long ago, so this should be fixed.