Every time I open more than a couple of tabs, a Firefox pop-up asks if I'm overwhelmed; I'm not. How can I make it stop? (I have already unticked Recommend features in Settings and set browser.newtabpage.activity-stream.asrouter.userprefs.cfr.features to False.) Equally annoying is the constant 'Summarise page' feature reminder. I have certainly Got It! by now.