a) install www/linuxpluginwrapper
b) install www/linux-flashplugin7
d) ln -s /usr/local/lib/npapi/linux-flashplugin/* /usr/local/lib/firefox/plugins
e) use sysinstall to install the source of system programs (/usr/src/libexec)
f) Execute:
# cd /usr/src
# patch < rtld_dlsym_hack.diff
# cd libexec/rtld-elf/
# make clean
# make obj
# make depend
# make && make install
g) restart firefox.