The answer is easy, once you know that screen resolution is detected with a little javascript code accessing the values of screen.width and screen.height, respectively (like in the following example), and that Firefox computes these values taking the zoom level into account.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>Screen resolution</title> <meta http-equiv="content-type" content="text/html;charset=utf-8" /> </head> <body> <h1>Screen resolution</h1> <p>Width x Height: <span id="resolution"></span></p> <script type="text/javascript"> window.onload = function() { document.getElementById('resolution').innerHTML = screen.width + 'x' + screen.height; }; </script> </body> </html>
If you try this page with Firefox, you can see that changing the resolution (ctrl-plus and ctrl-minus) does affect the numbers you get (press ctrl-0 to reset standard zoom level).
Unfortunately, it seems that there are not valid generic methods for getting the zoom level, at least according to this page on StackOverflow.
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