Hi,
As posted in this bug http://bugs.centos.org/view.php?id=6843 there are now problems with the current firefox on CentOS 5 to shutdown firefox cleanly.
If others experience the same please report if you can reproduce it.
While we are at it, may it be possible for the developers to rebuild the package with the correct config as shown here:
http://bugs.centos.org/view.php?id=6843#bugnotes
If it makes no difference then we at least know that it may also happen with upstreams package.
Regards and thanks for all the hard work! Simon