Firefox 22 and Windows 7 Font Settings Firefox now looks at Windows 7 text enlargement settings. For an alternative and more adjustable option. Do the following: Disable the settings in Firefox that track Windows Font Settings. Type about:config into the Firefox address bar. Change the value of layout.css.devPixelsPerPx from -1 to 1. Install No Squint. You can also adjust Firefox’s interface text by installing Theme Font & Size Changer.