install flashplayer plugin to firefox on centos linux

1. download rpm from adobe
adobe-release-x86_64-1.0-1.noarch.rpm
2. install it use rpm
rpm -i adobe-release-x86_64-1.0-1.noarch.rpm
3. install flash-plugin use yum
yum install flash-plugin.x86_64

4. restart friefox

you should be good to have flash player plugin on firefox.

reference:
http://digitizor.com/2009/05/19/how-to-get-flash-plugin-to-work-on-firefox-3-for-linux/