I left my computer with a number of windows and documents open, some in the midst of making changes. When I returned, my other activity was gone and Firefox said it had just done an automatic update. Did the Firefox update cancel all the programs I had active? Did I get any warning that Firefox was going to do an automatic update? I think no program should do an automatic restart of Windows without the explicit permission of the user. A warning that it will be started automatically in x minutes is not good enough, if the user has left the computer for several hours without recording all that was being worked on. Microsoft Windows does that as well and I think it is a nasty thing to do to users.