I took this script, it fixes the firefox flash stuff by downloading the latest version from adobe itself
Code:
#!/bin/bash
# Script created by
# Romeo-Adrian Cioaba romeo.cioaba@spotonearth.com
# Jaša Bartelj jasa.bartelj@gmail.com
echo "Stopping any Firefox that might be running."
sudo killall -9 firefox
echo "Removing any other flash plugin previously installed."
sudo apt-get remove -y --purge flashplugin-nonfree gnash gnash-common mozilla-plugin-gnash swfdec-mozilla libflashsupport nspluginwrapper
sudo rm -f /usr/lib/mozilla/plugins/*flash*
sudo rm -f ~/.mozilla/plugins/*flash*
sudo rm -f /usr/lib/firefox/plugins/*flash*
sudo rm -f /usr/lib/firefox-addons/plugins/*flash*
sudo rm -rfd /usr/lib/nspluginwrapper
echo "Installing Flash Player 10."
sudo cd /tmp
sudo wget http://labs.adobe.com/downloads/flashplayer10.html
sudo wget `cat flashplayer10.html | egrep -o "http:.*"|cut -d\" -f1|grep linux-x86_64.so.tar.gz`
ARCHIVE=`ls libflashplayer-*.linux-x86_64.so.tar.gz`
echo "Version is $ARCHIVE."
sudo tar zxvf $ARCHIVE
sudo cp libflashplayer.so /usr/lib/mozilla/plugins/
echo "Linking the libraries so Firefox and apps built on XULRunner can find it."
sudo ln -sf /usr/lib/mozilla/plugins/libflashplayer.so /usr/lib/firefox-addons/plugins/
sudo ln -sf /usr/lib/mozilla/plugins/libflashplayer.so /usr/lib/xulrunner-addons/plugins/
# now doing some cleaning up:
sudo rm -rf flashplayer10.html
sudo rm -rf libflashplayer.so
sudo rm -rf $ARCHIVE