Description of problem:
SELinux is preventing /usr/bin/nspluginscan from using the 'dac_override' capabilities.

*****  Plugin mozplugger (87.7 confidence) suggests  *************************

If you want to use the plugin package
Then you must turn off SELinux controls on the Firefox plugins.
Do
# setsebool -P unconfined_mozilla_plugin_transition 0

*****  Plugin dac_override (12.1 confidence) suggests  ***********************

If you want to help identify if domain needs this access or you have a file with the wrong permissions on your system
Then turn on full auditing to get path information about the offending file and generate the error again.
Do

Turn on full auditing
# auditctl -w /etc/shadow -p w
Try to recreate AVC. Then execute
# ausearch -m avc -ts recent
If you see PATH record check ownership/permissions on file, and fix it, 
otherwise report as a bugzilla.

*****  Plugin catchall (1.66 confidence) suggests  ***************************

If you believe that nspluginscan should have the dac_override capability 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 nspluginscan /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                unconfined_u:unconfined_r:mozilla_plugin_t:s0-s0:c
                              0.c1023
Target Context                unconfined_u:unconfined_r:mozilla_plugin_t:s0-s0:c
                              0.c1023
Target Objects                 [ capability ]
Source                        nspluginscan
Source Path                   /usr/bin/nspluginscan
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           kde-baseapps-4.11.2-1.fc19.x86_64
Target RPM Packages           
Policy RPM                    selinux-policy-3.12.1-74.9.fc19.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 3.11.4-201.fc19.x86_64 #1 SMP Thu
                              Oct 10 14:11:18 UTC 2013 x86_64 x86_64
Alert Count                   63
First Seen                    2013-10-04 13:08:49 IDT
Last Seen                     2013-10-16 15:50:20 IDT
Local ID                      01d6b5a0-2b40-4abe-abf0-fb10161730bc

Raw Audit Messages
type=AVC msg=audit(1381927820.47:473): avc:  denied  { dac_override } for  pid=1871 comm="nspluginscan" capability=1  scontext=unconfined_u:unconfined_r:mozilla_plugin_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:mozilla_plugin_t:s0-s0:c0.c1023 tclass=capability


type=SYSCALL msg=audit(1381927820.47:473): arch=x86_64 syscall=access success=no exit=EACCES a0=102d278 a1=2 a2=200 a3=1 items=0 ppid=1577 pid=1871 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 ses=1 tty=(none) comm=nspluginscan exe=/usr/bin/nspluginscan subj=unconfined_u:unconfined_r:mozilla_plugin_t:s0-s0:c0.c1023 key=(null)

Hash: nspluginscan,mozilla_plugin_t,mozilla_plugin_t,capability,dac_override

Additional info:
reporter:       libreport-2.1.9
hashmarkername: setroubleshoot
kernel:         3.11.10-200.fc19.x86_64
type:           libreport