Installing 64 bit Flash plugin

1. Download the plugin from here : http://labs.adobe.com/downloads/flashplayer10.html
2. Extract the tar file
3. Open gnome file manager
4. Navigate to home folder
5. Display the hidden files (press Ctrl + H )
6. Get in to folder .mozilla
7. Create folder plugins
8. Copy libflashplayer.so extracted from the tar file
9. Restart mozilla firefox
10. To check the flash version log on to this site in mozilla : http://www.playerversion.com/

Or you can do this....

1. copy libflashplayer.so to /usr/lib/mozilla/plugins
2. If you are using opera as your alternate browser then flash should work by default

done...!