xsession errors in FF with GTK-engine (Linux)

When I use the gtk-engine with latest FF (so it looks more like KDE) my
~/.xsession-errors file fills up quickly with hundreds of lines reading
like:

: (Gecko:26729): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_rowstride: assertion
`pixbuf != NULL' failed

: (Gecko:26729): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_rowstride: assertion
`pixbuf != NULL' failed

Everything works fine. When I take off the "Use GTK" option in the KDE
control panel, the errors stop.

Anyone know what is happening and maybe how to stop it? I kind of like FF
looking like QT and not gnome.

Thanks.

al

ANC