To make it work, you also need to force the plugin registry to rebuild. You need to close your firefox (entirely!). Then erase the file pluginreg.dat in your profile directory (~/.mozilla/firefox/SOMEWEIRDSTRING.default/).
Start Firefox 3 again and verify that plugins are installed by typing aboutlugins into your URL bar.
I did that but in this file: /usr/local/lib/firefox3/plugins
and this is what I ln in this file:
I have image but no sound same think for flashplayer 9.
What I do wrong should I do like you?