SELinux is preventing /usr/lib64/firefox-3.6/firefox from using the 'execstack' accesses on a process.

*****  Plugin allow_execstack (53.1 confidence) suggests  ********************

If you do not think /usr/lib64/firefox-3.6/firefox should need to map stack memory that is both writable and executable.
Then you need to report a bug. This is a potentially dangerous access.
Do
contact your security administrator and report this issue.

*****  Plugin catchall_boolean (42.6 confidence) suggests  *******************

If you want to allow unconfined executables to make their stack executable.  This should never, ever be necessary. Probably indicates a badly coded executable, but could indicate an attack. This executable should be reported in bugzilla
Then you must tell SELinux about this by enabling the 'allow_execstack' boolean.
Do
setsebool -P allow_execstack 1

*****  Plugin catchall (5.76 confidence) suggests  ***************************

If you believe that firefox should be allowed execstack access on processes labeled unconfined_t by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# grep /usr/lib64/firefox-3.6/firefox /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Target Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Target Objects                Unknown [ process ]
Source                        firefox
Source Path                   /usr/lib64/firefox-3.6/firefox
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           firefox-3.6.13-1.fc14
Target RPM Packages           
Policy RPM                    selinux-policy-3.9.7-18.fc14
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 2.6.35.9-64.fc14.x86_64 #1 SMP Fri Dec
                              3 12:19:41 UTC 2010 x86_64 x86_64
Alert Count                   3
First Seen                    Wed 22 Dec 2010 08:58:28 AM EST
Last Seen                     Wed 22 Dec 2010 08:58:28 AM EST
Local ID                      bf21c0be-fff9-4b3f-80cd-528e466726c0

Raw Audit Messages
type=AVC msg=audit(1293026308.745:54): avc:  denied  { execstack } for  pid=3169 comm="firefox" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=process

firefox,unconfined_t,unconfined_t,process,execstack
type=SYSCALL msg=audit(1293026308.745:54): arch=x86_64 syscall=mprotect success=no exit=EACCES a0=7fff50959000 a1=1000 a2=1000007 a3=3760021000 items=0 ppid=3155 pid=3169 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=2 comm=firefox exe=/usr/lib64/firefox-3.6/firefox subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)
firefox,unconfined_t,unconfined_t,process,execstack

#============= unconfined_t ==============
#!!!! This avc can be allowed using the boolean 'allow_execstack'

allow unconfined_t self:process execstack;