Firefox keeps prompting me to install already installed java plugin, plugin doesn't load

[Duncan Lithgow]

Binary package hint: firefox-3.5

This is probably a duplicate of bug 440478, just here for the files then.

ProblemType: Bug
Architecture: i386
Date: Sat Nov 14 14:32:34 2009
DistroRelease: Ubuntu 9.10
Package: firefox-3.5 3.5.5+nobinonly-0ubuntu0.9.10.1
ProcEnviron:
 PATH=(custom, user)
 LANG=en_DK.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: firefox-3.5
Uname: Linux 2.6.31-14-generic i686
XsessionErrors:
 (xfce4-cpugraph-plugin:1431): Gtk-CRITICAL **: gtk_container_set_border_width: assertion `GTK_IS_CONTAINER (container)' failed
 (polkit-gnome-authentication-agent-1:1459): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (xfce4-mixer-plugin:1433): libxfce4mixer-CRITICAL **: xfce_mixer_get_track: assertion `GST_IS_MIXER (card)' failed