So, I manage to get flash working on FreeBSD. Without using the Linux compatability layer! Many thanks to drizzt for his precious suggestions. I used graphics/gnash and www/firefox. Be sure not to check “GSTREAMER” on the gnash port configuration ncurses window: it didn’t work for me. To watch YouTube videos, you must install multimedia/mplayer and www/mplayer-plugin, the Greasemonkey plugin for F