If you execute 

setsebool -P allow_execmod=1

as root, Does that fix the problem?

(In reply to comment #1)
> If you execute 
> 
> setsebool -P allow_execmod=1
> 
> as root, Does that fix the problem?

No it doesn't

After that command in dmesg there is message:
security: committed booleans { allow_execstack:1, allow_execmem:1, allow_execmod
:1, use_nfs_home_dirs:0, use_samba_home_dirs:0, allow_ypbind:1, allow_kerberos:1
, httpd_unified:1, httpd_builtin_scripting:0, httpd_enable_cgi:1, httpd_enable_h
omedirs:1, httpd_ssi_exec:1, httpd_tty_comm:0, httpd_can_network_connect:0, http
d_disable_trans:0, dhcpd_disable_trans:0, mysqld_disable_trans:0, named_disable_
trans:0, named_write_master_zones:0, nscd_disable_trans:0, ntpd_disable_trans:0,
 portmap_disable_trans:0, postgresql_disable_trans:0, snmpd_disable_trans:0, squ
id_disable_trans:0, syslogd_disable_trans:0, use_syslogng:0, winbind_disable_tra
ns:0, ypbind_disable_trans:0 }

But when I restart firefox there comes still same error message:
audit(1118859238.775:0): avc:  denied  { execmod } for  pid=6621 comm=firefox-bi
n path=/home/samikk/.mozilla/plugins/libflashplayer.so dev=hdh6 ino=227461 scont
ext=user_u:system_r:unconfined_t tcontext=user_u:object_r:user_home_t tclass=fil e

Fixed in selinux-policy-targeted-1.17.30-3.9

(In reply to comment #3)
> Fixed in selinux-policy-targeted-1.17.30-3.9

Yes, it works again with that version

Thanks

Broken again in selinux-policy-targeted-1.17.30-3.13.  Flash plugin doesn't
work, and doing /usr/sbin/setenforce 0 makes it work.