Miscellany

function printToFile(window, fileThing, continuation) {    var printProgressListener = {        onStateChange: function(aWebProgress, aRequest, aStateFlags, aStatus) {            if(aStateFlags & Ci.nsIWebProgressListener.STATE_STOP)                continuation();        },        onProgressChange: function(aWebProgress, aRequest, aCurSelfProgress,                                   aMaxSelfProgress, aCurTotalProgress, aMaxTotalProgress) {},        onLocationChange: function(aWebProgress, aRequest, aLocation) {},        onStatusChange: function(aWebProgress, aRequest, aStatus, aMessage) {},        onSecurityChange: function(aWebProgress, aRequest, state) {}    };    var filePath = (fileThing instanceof Ci.nsILocalFile ?                    fileThing.path : fileThing);    var webBrowserPrint = window        .QueryInterface(Ci.nsIInterfaceRequestor)        .getInterface(Ci.nsIWebBrowserPrint);    var settings = webBrowserPrint.globalPrintSettings;    // Empiric evidence ;-) suggests that minimal margins for the    // Librie are [top: 0.6, bottom: 0.6, left: 0, right: 0]    settings.marginTop = 0.75;    settings.marginBottom = 0.75;    settings.marginLeft = 0.15;    settings.marginRight = 0.15;    settings.footerStrCenter = '';    settings.headerStrRight = '';    settings.headerStrLeft = '';    settings.printToFile = true;    settings.printSilent = true;    settings.toFileName = filePath;    settings.printerName = 'PostScript/default';    settings.paperName = 'A4';    settings.showPrintProgress = true;    webBrowserPrint.print(settings, printProgressListener);}