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Firefox window always opens in smaller font. No matter what I try, I can't get it to default to 100% size.

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See above. Firefox window will not default to full size when I open applicaiton, new window or new tab

See above. Firefox window will not default to full size when I open applicaiton, new window or new tab

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Ctrl+0 (zero) should work, How do you know it is not 100%

see https://support.mozilla.com/questions/837661

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Thanks - it worked. i kept having to click on "resize" to get to 100%. Now it seems to be at 100% default. I appreciate the help.