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How to fill up my laptop screen with Firefox horizontally as it currently has a 3" margin on the left and right sides?tly has a

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I just purchased a 17.3" screened-laptop using MS Outlook and Explorer 9 Browser. I cannot use Firefox as my default Browser because I cannot get Firefox to fill up my screen.When I open up Firefox, it maintains a large 3" margin on the left and right sides which does not exist when I open up Explorer 9. Increasing the font size only increases the text size vertically but does nothing to decrease the margin size horizontally.

I just purchased a 17.3" screened-laptop using MS Outlook and Explorer 9 Browser. I cannot use Firefox as my default Browser because I cannot get Firefox to fill up my screen.When I open up Firefox, it maintains a large 3" margin on the left and right sides which does not exist when I open up Explorer 9. Increasing the font size only increases the text size vertically but does nothing to decrease the margin size horizontally.

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You can use this extension to set a default font size and page zoom on web pages:

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