<Rant:> I didn't want my work interrupted, so I told Software Updater to 'remind me later'. Firefox insisted on behaving like Windows 10 and updated anyway and further insisted on a re-start before it would do anything else. I hit the restart button and to add insult to injury... nothing. No restart and my open tabs weren't restored when I restarted manually. Bastards. If you want to behave like bloody Microsoft, sell out to them so we all know where we stand and can go use a browser we can trust not to go behind our backs making a zillion connections and updates without our consent. The ability to disable Firefox update checking was removed in Firefox 63. Thanks a bunch. Do not lecture me, Mozilla, about security, privacy and freedom of choice if you're going to enforce automatic updates whether I want them or, for good reason, not. Twats. </Rant>