Flash no longer displayed in Firefox

[edward]

Hi,
I recently upgraded my ports collection with portmanager. In the 
process, Firefox has been upgraded to 1.5_3,1. The problem is that Flash 
media is no longer displayed in Firefox (plugin is reported as missing).

I have linux-flashplugin-6.0r79_3 and linuxpluginwrapper-20051113 
installed and the linux emulator is active.
I assumed the libmap.conf file could be outdated, so I did a :
cp 
/usr/local/share/examples/linupluginwrapper/libmap.conf-FreeBSD5-stable 
/etc/libmap.conf
Still no luck. For all it's worth, QuickTime and Windows Media content 
still play fine on Firefox via Mplayer.

In case this may be useful :

# uname -a
FreeBSD .Domain 5.4-STABLE FreeBSD 5.4-STABLE #0: Sun Oct 30 15:12:21 
CET 2005     root at .Domain:/usr/obj/usr/src/sys/EDWARD  i386

# cat /etc/libmap.conf

# /etc/libmap.conf for FreeBSD 5-stable(5.3-BETA7 and later) and
# 6-current(6.0 to 6.0-BETA2)
# $Id: libmap.conf-FreeBSD5-stable,v 1.22 2005/11/13 01:46:14 nork Exp $

#######################################################
# Flash6 with Opera is not available.

# Flash6 with Konqueror
# SEE ALSO: http://freebsd.kde.org/howtos/konqueror-flash.php
# This configuration was integrated to following one.

# Flash6 with Mozilla/Firebird/Galeon/Epiphany/Konqueror/Kazehakase
[/usr/X11R6/lib/linux-flashplugin6/libflashplayer.so]
libpthread.so.0                 pluginwrapper/flash6.so
libdl.so.2                      pluginwrapper/flash6.so
libz.so.1                       libz.so.2
libstdc++-libc6.2-2.so.3        libstdc++.so.4
libm.so.6                       libm.so.3
libc.so.6                       pluginwrapper/flash6.so


#######################################################
# Acrobat with Opera is not available.

# Acrobat5 with Mozilla/Firebird/Galeon/Epiphany/Konqueror/Kazehakase
#[/usr/local/Acrobat5/Browsers/intellinux/nppdf.so]
#libc.so.6                      pluginwrapper/acrobat.so

# Acrobat7 with Mozilla/Firebird/Galeon/Epiphany/Konqueror/Kazehakase
[/usr/compat/linux/usr/local/Adobe/Acrobat7.0/Browser/intellinux/nppdf.so]
libc.so.6                       pluginwrapper/acrobat.so

# Japanese Acrobat7 with 
Mozilla/Firebird/Galeon/Epiphany/Konqueror/Kazehakase
[/usr/local/Acrobat7/Browser/intellinux/nppdf.so]
libc.so.6                       pluginwrapper/acrobat.so


#######################################################
# Helix RealPlayer with 
Mozilla/Firebird/Galeon/Epiphany/Konqueror/Kazehakase
[/usr/X11R6/lib/linux-mozilla/plugins/nphelix.so]
libstdc++.so.5                  libstdc++.so.4
libc.so.6                       pluginwrapper/realplayer.so


#######################################################
# Java3D
# NOTE: THESE ARE SAMPLES.  PLEASE SEE ALSO INSTALL MESSAGES
#       OF java/java3d PORT.
[/usr/local/jdk1.4.2/jre/lib/i386/libJ3D.so]
libdl.so.2                      pluginwrapper/java3d.so
libm.so.6                       libm.so.3
libnsl.so.1                     pluginwrapper/java3d.so
libpthread.so.0                 pluginwrapper/java3d.so
libc.so.6                       pluginwrapper/java3d.so

[/usr/local/jdk1.4.2/jre/lib/i386/libj3daudio.so]
libm.so.6                       libm.so.3
libnsl.so.1                     pluginwrapper/java3d_snd.so
libpthread.so.0                 pluginwrapper/java3d_snd.so
libc.so.6                       pluginwrapper/java3d_snd.so

[/usr/local/jdk1.4.2/jre/lib/i386/libJ3DUtils.so]
libpthread.so.0                 pluginwrapper/java3d.so
libc.so.6                       pluginwrapper/java3d.so


#######################################################
# Java Advanced Imaging (JAI) API
# NOTE: THIS IS A SAMPLE.  PLEASE SEE ALSO INSTALL MESSAGES
#       OF java/jai PORT.
[/usr/local/jdk1.4.2/jre/lib/i386/libmlib_jai/libmlib_jai.so]
libm.so.6                       libm.so.3
libc.so.6                       pluginwrapper/jai.so


#######################################################
# JAI Image I/O Tools
# NOTE: THIS IS A SAMPLE.  PLEASE SEE ALSO INSTALL MESSAGES
#       OF java/jai-imageio PORT.
[/usr/local/jdk1.4.2/jre/lib/i386/libclib_jiio.so]
libm.so.6                       libm.so.3
libc.so.6                       pluginwrapper/jai.so


#######################################################
# Photo Image Print System (for EPSON bubble jet printers driver)
#[/usr/local/lib/pips/]
#libc.so.6                      pluginwrapper/pips.so
#libdl.so.2                     pluginwrapper/pips.so


# firefox
Gtk-Qt theme engine warning:
   Could not open /proc/6705/cmdline
   This may cause problems for the GNOME window manager

Any clue what could be missing ?
Thanks,
Edward