This worked for me
https://help.ubuntu.com/community/AMD64/FirefoxAndPlugins#head-74ed36356cdab258889ed4e9ad010f068e13ff38
Copying the howto here for myself incase that tutorial would disapear:
Gutsy Gibbon 7.10
- Install the nspluginwrapper.
sudo apt-get install nspluginwrapper
Open Firefox and visit a page that requires flash, for example [WWW] http://www.adobe.com/products/flash/about/. Install the plugin by clicking on “Install Missing Plugins…” on the yellow bar at the top of the browser window as in the screenshot below. The Epiphany browser will use the flash plugin installed from Firefox.
Screenshot-Adobe – Flash Player – Mozilla Firefox.png
Versions prior to 7.10
sudo apt-get install ia32-libs ia32-libs-gtk linux32 lib32asound2
add the respository from: [WWW] http://www.janvitus.netsons.org/repository/ Then Install
sudo apt-get install nspluginwrapper gsfonts-x11
Download the .tar.gz Flash player 9 from Adobe site [WWW] http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash
Run nspluginwrapper
Copy “libflashplayer.so” and “flashplayer.xpt” to /usr/lib/mozilla-firefox/plugins/
Shutdown Firefox and run this:
nspluginwrapper -i /usr/lib/mozilla-firefox/plugins/libflashplayer.so
Now flash should work!
/!\ nspluginwrapper will create ~/.mozilla/plugins/npwrapper.libflashplayer.so However flash might not be detected by firefox until npwrapper.libflashplayer.so is copied back to /usr/lib/mozilla-firefox/plugins/