Not the core topic but the author says: "The most important extension is AdBlock Plus, to remove ads from the web" Out of all the extensions this is the most i

Not the core topic but the author says: "The most important extension is AdBlock Plus, to remove ads from the web" Out of all the extensions this is the most important? I never get this, most web ads just sit there, it is not like TV where I have to listen to them. Ads pay for a lot of things that he probably uses.