Firefox problem under Fedora 17

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http://forums.fedoraforum.org – I am running Fedora 17, 64 bit version. Firefox won't start. I logged out and logged in again, and I even rebooted. If I run it in a terminal window, I get $ firefox /usr/lib64/firefox/firefox: symbol lookup error: /usr/lib64/xulrunner/libxul.so: undefined symbol: PR_SetCurrentThreadName I even tried removing it and reinstalling it, but that doesn't help. Also, $ rpm -qf /usr/lib64/xulrunner/libxul.so yields xulrunner-16.0.1-1.fc17.x86_64 Can anyone suggest what I should do? Should I reinstall xlulrunner? Any other suggestions? I am posting this using g (HowTos)