mplayerplug-in: improved to find mozilla related development files

multimedia/mplayerplug-in/mplayerplug-in.conf

@@ -2,6 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: package/.../mplayerplug-in/mplayerplug-in.conf
+# Copyright (C) 2010 The OpenSDE Project
 # Copyright (C) 2004 - 2006 The T2 SDE Project
 #
 # More information can be found in the files COPYING and README.
@@ -12,4 +13,8 @@
 # GNU General Public License can be found in the file COPYING.
 # --- SDE-COPYRIGHT-NOTE-END ---
 
+if pkginstalled firefox; then
+	var_append extraconfopt ' ' "--with-mozilla-home=$( pkgprefix -r firefox )"
+fi
+
 var_append makeinstopt ' ' "DESTDIR=${root:-/}"