Description of problem:
After updating firefox to 16.0.1 it does not start anymore. Starting from console reveals:
/usr/lib/firefox/firefox: symbol lookup error: /usr/lib/xulrunner/libxul.so: undefined symbol: PR_SetCurrentThreadName
Updating nspr to current available verison (4.9.2) fixes the problem.
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Fedora Bugzappers volunteer triage team
*** This bug has been marked as a duplicate of bug 866057 ***