Useful things to know, but how do they undo a designer wasting my screen space? If you're going to tell me to learn something, it should be CSS. At least Firefox can still be configured to follow its traditional role as "user agent" and allow me to override the bad decisions of designers, by setting toolkit.legacyUserProfileCustomizations.stylesheets and editing chrome/userContent.css . But it would be convenient if more people used the default CSS like danluu.com .

Not sure, as I don't have any wasted screen space, due to the techniques mentioned above. On really bad sites I try reader view first, View/Page Style/No Style (on Firefox) second, and if that doesn't work I close the tab. Pretty rare though.