Thanks for that, but unfortunately I cannot try them out. After posting the question I installed the Status-4-Evar add-on and it crashed Firefox. A reinstall/upgrade to version 5 did not help. Firefox has given me a number of problems apart from the two above so I have decided not to uninstall/reinstall as this would require a reinstall of AVG and some other security software and the problems would remain. So it is back to IE based Avant, which is pretty reliable and works in a natural way that I like.