Just now, as I was in the middle of something, Firefox popped up a usage tip about tabs. I find this disruptive. Is there a way to turn these off? If I want to know how to do something, I'll look in the help. It's fine when you create a new feature to display a tab when I first launch after an upgrade, or to have the Help menu show a Latest Features item, but please don't interrupt my work with pop-ups. For the moment, I don't see anything in Preferences about this. Is there an about:config setting I can add to suppress this feature?