When I open Firefox, I have to use the 'Zoom In' feature to make the page larger and fill more of the screen. Firefox's default settings opens pages that only fills about half a screen width, centered horizontally. I can zoom in pages to make them larger and fill the screen, but I must do this everytime I go to a different web page. How can I somehow change the default configuration settings, so windows will always open larger? I only have this problem with Firefox. IE8 & Safari do not have this problem.