When I open a new tab and display a website, is there any way I can if I want to make the page fill half the screen so when I open another tab I can have the option to do that on the new website so in effect I have two tabs open with one website on the left and the other website on the right, I know I can drag the corner of the page and make it fill only half the screen then open another window and do the same with that tab, but just wondered if there was either a plugin or shortcut rather than carefully dragging so both fit on the page, and if it can be done with having only one window open. Hope that makes sense! I am using apple macbook pro with firefox.