1. I installed 'linuxpluginwrapper-20051113_7' and added the next lines to '/etc/libmap.conf'
[/usr/local/lib/npapi/linux-flashplugin/libflashplayer.so]
libpthread.so.0 libpthread.so.2
libdl.so.2 pluginwrapper/flash7.so
libz.so.1 libz.so.3
libm.so.6 libm.so.4
libc.so.6 pluginwrapper/flash7.so
2. Installed /usr/ports/www/firefox/
3. Created a symlink:
ln -s /usr/local/lib/npapi/linux-flashplugin/libflashplayer.so /usr/local/lib/firefox/plugins/libflashplayer.so
VOILA ! Flash is back in action under freeBSD & Firefox