Firefox 4.0 doesn't open, shows as incompatible (using Win7)

Have been using 3.6 . Downloaded 4.0 and now it doesn't open.

If you need to increase or decrease the size of fonts and other elements in the user interface and web pages then you can increase the String pref layout.css.devPixelsPerPx from 1.0 to 2.0 in 0.1 or 0.05 steps to see what works best.
In current Firefox versions this pref is a String value parsed to a float and allows to fine tune the dimensions of all elements (user interface and web pages) more precisely.
See:
* http://kb.mozillazine.org/about%3Aconfig
If you need to increase (or decrease) the font size on websites then look at the NoSquint or Default FullZoom Level extension.
* Default FullZoom Level - https://addons.mozilla.org/firefox/addon/6965
* NoSquint - https://addons.mozilla.org/firefox/addon/2592
* Theme Font & Size Changer: https://addons.mozilla.org/firefox/addon/162063/

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