Install flash plugin for Firefox/others in Linux

After fresh installation of Linux distro, most of the packages we have to install from yast or by terminal.
As using Internet, we use Firefox for browsing. But by default there is no flash plugin. So we have to install it.
I tried myself many times from yast2 and sometime when FF pop up message for missing plugins, none of them works for me.
But i find out an easy way to sort out this problem.
I'm using currently openSUSE 11.0 Gnome,KDE and openSUSE 11.1 Gnome,KDE. I tried on both, and it works.
But i am not sure about other distros, But you can give it a try.

So lets start:
1st of all make sure all Firefox windows are closed.

Then press Alt and F2 to bring up Run applet, Type YaST or yast2 and press ENTER.
Key in your root password and press ENTER, Click on software management.
Search for flash, mark flash-player for uninstallation and click Accept.
Close YaST

Now Visit this site to download flash player(for this open FF):
http://get.adobe.com/flashplayer/

and click on the drop down list to select the version for download. Select the .rpm version and download it.

After you have downloaded it, close all Firefox windows. Then right click on the rpm and select Open With->Install software OR double click the rpm.
Key in your root password and press ENTER, it will install in a jiffy, as if nothing has happened.

Now open terminal,
Type:

sudo cp /usr/lib/flash-plugin/libflashplayer.so /usr/lib/browser-plugins/

and press ENTER

And that's it, you are finished!

Now test, open FF, and try www.youtube.com

Enjoy!!!