approved mechanism to switch to 32-bit firefox?

[Jack Howarth <howarth@xxxxxxxxxxxxxxxxx>]

   I noticed that a fresh install of x86_64 FC6 resulted in
both i386 and x86_64 packages for firefox being installed.
I would like to configure my machine to default to the
i386 version of firefox and am wondering if there is
an approved mechanism to setting this (since FC6 went
out of its way to preinstall the i386 binaries on
x86_64)?
                  Jack