[ALUG] Logout for Firefox?

Does anyone know how I can make Mozilla Firefox log out of an HTTP-authenticated web site? I thought there was a menu option or extension to forget the auth details, but I can't find it now. On my own sites, I always give the option of an "forbidden forever" page (aka a Babyshambles page), but the government site I'm accessing doesn't have one. I'll restart the browser this time, but it's irritating, isn't it? Thanks for any info, -- MJ Ray (slef), Lynn, England, retposxto cxe http://mjr.towers.org.uk/