How to upgrade Firefox and install Chrome in RHEL 6.2?

[mr. c]

why are you using Red Hat Entreprise Linux?
it is a commercial product with "free support" only for a few weeks after which

- you can not update your software anymore respectively have to use free / community repositories instead of the no more longer available Red Hat ones (and even that may only work w/ lot of security issues such that you will not be able to implement it)

- a lot more problems.

thus long story short, why don't you use fedora instead of Red Hat Enterprise Linux?
http://fedoraproject.org/
i could advise you to use CentOS (Community Enterprise OS) an open source / community based version of Red Hat enterprise Linux but your Linux (computer?) skills are not up to that.

fedora comes with a fairly recent or even the latest version of FireFox which gets updated on a regular basis
and Chrome can be downloaded with Yum or simply installed by going to http://www.google.com & click on the Chrom pop-up
doesn't that sound much more easier then having to mess around with repositories and certificates?