function fingerprint_browser() {
    "use strict";
    var strOnError, strUserAgent, numVersion, strBrowser, strOut;

    strOnError = "Error";
    strUserAgent = null;
    numVersion = null;
    strBrowser  = null;
    strOut = null;

    try {
        strUserAgent = navigator.userAgent.toLowerCase();
        if (/msie (\d+\.\d+);/.test(strUserAgent)) { //test for MSIE x.x;
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            if (strUserAgent.indexOf("trident/6") > -1) {
                numVersion = 10;
            }
            if (strUserAgent.indexOf("trident/5") > -1) {
                numVersion = 9;
            }
            if (strUserAgent.indexOf("trident/4") > -1) {
                numVersion = 8;
            }
            strBrowser = "Internet Explorer " + numVersion;
        } else if (strUserAgent.indexOf("trident/7") > -1) { //IE 11+ gets rid of the legacy 'MSIE' in the user-agent string;
            numVersion = 11;
            strBrowser = "Internet Explorer " + numVersion;
        }  else if (/firefox[\/\s](\d+\.\d+)/.test(strUserAgent)) { //test for Firefox/x.x or Firefox x.x (ignoring remaining digits);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Firefox " + numVersion;
        } else if (/opera[\/\s](\d+\.\d+)/.test(strUserAgent)) { //test for Opera/x.x or Opera x.x (ignoring remaining decimal places);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Opera " + numVersion;
        } else if (/chrome[\/\s](\d+\.\d+)/.test(strUserAgent)) { //test for Chrome/x.x or Chrome x.x (ignoring remaining digits);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Chrome " + numVersion;
        } else if (/version[\/\s](\d+\.\d+)/.test(strUserAgent)) { //test for Version/x.x or Version x.x (ignoring remaining digits);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Safari " + numVersion;
        } else if (/rv[\/\s](\d+\.\d+)/.test(strUserAgent)) { //test for rv/x.x or rv x.x (ignoring remaining digits);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Mozilla " + numVersion;
        } else if (/mozilla[\/\s](\d+\.\d+)/.test(strUserAgent)) { //test for Mozilla/x.x or Mozilla x.x (ignoring remaining digits);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Mozilla " + numVersion;
        } else if (/binget[\/\s](\d+\.\d+)/.test(strUserAgent)) { //test for BinGet/x.x or BinGet x.x (ignoring remaining digits);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Library (BinGet) " + numVersion;
        } else if (/curl[\/\s](\d+\.\d+)/.test(strUserAgent)) { //test for Curl/x.x or Curl x.x (ignoring remaining digits);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Library (cURL) " + numVersion;
        } else if (/java[\/\s](\d+\.\d+)/.test(strUserAgent)) { //test for Java/x.x or Java x.x (ignoring remaining digits);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Library (Java) " + numVersion;
        } else if (/libwww-perl[\/\s](\d+\.\d+)/.test(strUserAgent)) { //test for libwww-perl/x.x or libwww-perl x.x (ignoring remaining digits);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Library (libwww-perl) " + numVersion;
        } else if (/microsoft url control -[\s](\d+\.\d+)/.test(strUserAgent)) { //test for Microsoft URL Control - x.x (ignoring remaining digits);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Library (Microsoft URL Control) " + numVersion;
        } else if (/peach[\/\s](\d+\.\d+)/.test(strUserAgent)) { //test for Peach/x.x or Peach x.x (ignoring remaining digits);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Library (Peach) " + numVersion;
        } else if (/php[\/\s](\d+\.\d+)/.test(strUserAgent)) { //test for PHP/x.x or PHP x.x (ignoring remaining digits);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Library (PHP) " + numVersion;
        } else if (/pxyscand[\/\s](\d+\.\d+)/.test(strUserAgent)) { //test for pxyscand/x.x or pxyscand x.x (ignoring remaining digits);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Library (pxyscand) " + numVersion;
        } else if (/pycurl[\/\s](\d+\.\d+)/.test(strUserAgent)) { //test for pycurl/x.x or pycurl x.x (ignoring remaining digits);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Library (PycURL) " + numVersion;
        } else if (/python-urllib[\/\s](\d+\.\d+)/.test(strUserAgent)) { //test for python-urllib/x.x or python-urllib x.x (ignoring remaining digits);
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Library (Python URLlib) " + numVersion;
        } else if (/appengine-google/.test(strUserAgent)) { //test for AppEngine-Google;
            numVersion = Number(RegExp.$1); // capture x.x portion and store as a number
            strBrowser = "Cloud (Google AppEngine) " + numVersion;
        } else {
            strBrowser = "Unknown";
        }
        strOut = strBrowser;
        return strOut;
    } catch (err) {
        return strOnError;
    }
}