[Fedora,Ubuntu,Opensuse...] Install Adobe Flash player on all Linux system

Prepare:

 Information: Base on your linux system, mozilla plugin directory will place in one of the below:

if your linux architecture is x64:
$HOME/.mozilla/plugins
program_directory/plugins
/usr/lib64/mozilla/plugins
/usr/lib64/xulrunner/plugins

if your linux architecture is x86:
$HOME/.mozilla/plugins
program_directory/plugins
/usr/lib/mozilla/plugins
/usr/lib/xulrunner/plugins

In my fedora system x64 architecture it is:
/usr/lib64/mozilla/plugins

Do it:

Step 1: Go to Adobe Flash player download page http://get.adobe.com/flashplayer/
Step 2: Select .tar.gz for linux in "Your system" selection.
Step 3: Click "Download now" and save this file (example : Downloads folder) in Downloads directory
Step 4: Open terminal, navigation to downloaded file and extract it.

mkdir adobeflash

tar -xzvf flashPlayer.tar.gz -C adobeflash

Step 5: Login with root user (su root, enter and type password for root user) and move to adobeflash directory
Step 6: cp -r usr/   /usr

Step 7: cp libflashplayer.so  /usr/lib64/mozilla/plugins

Step 8: Restart firefox and enjoy :)

Note: If it still not effect, it is because your selinux is turn on, you can turn it off by open terminal -> login with root -> execute command setenforce 0 -> restart firefox