I am a Fedora 5 user, too, and yum also installs 1.5 here. However, I am quite happy with it since I like 1.5 more than 2.0. However, if you do want the newest Firefox version, you'll either have to find an FC5 repository that serves newer Firefox packages or install it manually from some RPM or even with the normal Firefox installer. As far as I know, the official FC5 repositories don't get updated that much anymore. Moving to FC6 would probably be the best choice if you always want the newest versions.
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