I also use Fedora 9 and the default xulrunner installed is 1.9b5. I've got
hard times using Firefox since the day 1 on Fedora 9. Besides the XPCOM
errors I also encounters problem when viewing Eclipse's Help when offline,
I keep getting message 'This document cannot be displayed while offline.
To go online, uncheck Work Offline from the File menu'. How did you
install the XULRunner ? Via Yum ? Because I've got very bad internet
connection here.