Comment 10 for bug 452151

The OpenSearch plugins for Karmic / Firefox 3.5 / en-US are in

/usr/lib/firefox-addons/searchplugins/common/en-US

Copying all XML files in this directory to

/home/{USER}/.mozilla/firefox/vkuuxfit.default/searchplugins/

does kick off a search - but took me to surprisingly to ebay.com search engine
Anyway, it does not kill Do, so that's a start... below the crashtrace before copying the xml-files

/m

Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.ArgumentNullException: Argument cannot be null.
Parameter name: element
  at Do.Core.HistogramRelevanceProvider.IncreaseRelevance (Do.Universe.Item element, System.String match, Do.Universe.Item other) [0x00000]
  at Do.Core.ItemExtensions.IncreaseRelevance (Do.Universe.Item self, System.String match, Do.Universe.Item other) [0x00000]
  at Do.Core.Controller.PerformAction (Boolean vanish) [0x00000]
  at Do.Core.Controller.OnActivateKeyPressEvent (Gdk.EventKey evnt) [0x00000]
  at Do.Core.Controller.KeyPressWrap (Gdk.EventKey evnt) [0x00000]
  at Do.Interface.AnimationBase.AbstractAnimatedInterface.OnKeyPressEvent (Gdk.EventKey evnt) [0x00000]
  at Gtk.Widget.keypressevent_cb (IntPtr widget, IntPtr evnt) [0x00000]
   at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
   at Gtk.Widget.keypressevent_cb(IntPtr widget, IntPtr evnt)
   at Gtk.Application.gtk_main()
   at Gtk.Application.Run()
   at Do.Do.Main(System.String[] args)