Enable plugin nppdf.so in firefox?

[cblasius]

 >> Alexandre Biancalana wrote:
 >> >> # cd /usr/ports/www/linuxpluginwrapper
 >> >> # make all install clean
 >> >> # cp 
/usr/local/share/examples/linuxpluginwrapper/libmap.conf-FreeBSD6
 >> >> /etc/libmap.conf
 >> >>
 >> >> restart your firefox and open "about:plugins" url to see your 
installed
 >> >> plugins

I menaged to do  it. Next I run firefox and go
Edit -> Preferences -> Downloads -> View & Edit Actions...
and then I obtain this message (worse than previous):

[john at machina ~]$ firefox
LoadPlugin: failed to initialize shared library /usr/X11R6/Adobe/Acrobat7.0/
ENU/Browser/intellinux/nppdf.so [/usr/X11R6/Adobe/Acrobat7.0/ENU/Browser/
intellinux/nppdf.so: Undefined symbol "XtCalloc"]
LoadPlugin: failed to initialize shared library 
/usr/X11R6/lib/linux-mozilla/
plugins/nphelix.so [Shared object "libm.so.6" not found,
required by "nphelix.so"]
LoadPlugin: failed to initialize shared library /usr/X11R6/Adobe/
Acrobat7.0/ENU/Browser/intellinux/nppdf.so [/usr/X11R6/Adobe/
Acrobat7.0/ENU/Browser/intellinux/nppdf.so: Undefined symbol "XtCalloc"]
LoadPlugin: failed to initialize shared library /home/john/.mozilla/
plugins/nppdf.so [/home/john/.mozilla/plugins/nppdf.so:
Undefined symbol "XtCalloc"]
LoadPlugin: failed to initialize shared library /usr/X11R6/Adobe/Acrobat7.0/
ENU/Browser/intellinux/nppdf.so [/usr/X11R6/Adobe/Acrobat7.0/ENU/
Browser/intellinux/nppdf.so: Undefined symbol "XtCalloc"]

I also obtain this message when type in firefox:
about:plugins

I need your help.

Best regards,
cblasius