unable to install addons in Sea Monkey 1.1.17

[Rajinder Sandhu]

Binary package hint: seamonkey

I am unable o install any addon tried flashgot, Downthemall and adblockplus... the error reported is install script not found.
I am using seamonkey 1.1.17 on ubuntu 9.10...generated bug report attached
Thanks
Rajinder Sandhu
Bangalore

ProblemType: Bug
Architecture: i386
Date: Sun Nov 15 19:08:00 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: seamonkey 1.1.17+nobinonly-0ubuntu1
PackageArchitecture: all
ProcEnviron:
 LANG=en_IN
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-15.50-generic
SourcePackage: seamonkey
Uname: Linux 2.6.31-15-generic i686
XsessionErrors:
 (gnome-settings-daemon:1736): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (nautilus:1748): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
 (polkit-gnome-authentication-agent-1:1754): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed