print PDF present in iframe

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How to print PDF which is present in iframe?

I want to print pdf present in iframe.
I am able to print with browsers IE and Chrome, but it is giving problems with FireFox, Safari and Opera.

I have tried as follows:

function printIframe() {
        if (navigator.userAgent.indexOf("Firefox") != -1) {
//This is not working
            var frame_window = window.frames["my_iframe"];
            frame_window.print();
                                  
        }
        else if (navigator.userAgent.indexOf("MSIE") != -1) {
//working
            var x = document.getElementById("pdfDocument");
            x.print();
        }
        else if (navigator.userAgent.indexOf("Chrome") != -1) {
//working
            document.my_iframe.focus();
            document.my_iframe.print();
        }
        else {
//not working
            // Safari browser or other one   
//            document.getElementById('my_iframe').focus();
//            document.getElementById('my_iframe').onload = setTimeout('iframe.print()',2500);
//            var ifWin = document.getElementById('my_iframe').contentWindow;
//            ifWin.focus();
//            ifWin.print();
            //printpdf();

        }

    }

Please guide me for this.

Thanks.