getBrowserInfo.js

var isMobileDevice = !!(/Android|webOS|iPhone|iPad|iPod|BB10|BlackBerry|IEMobile|Opera Mini|Mobile|mobile/i.test(navigator.userAgent || ''));

var isEdge = navigator.userAgent.indexOf('Edge') !== -1 && (!!navigator.msSaveOrOpenBlob || !!navigator.msSaveBlob);

var isOpera = !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
var isFirefox = typeof window.InstallTrigger !== 'undefined';
var isSafari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
var isChrome = !!window.chrome && !isOpera;
var isIE = typeof document !== 'undefined' && !!document.documentMode && !isEdge;

// this one can also be used:
// https://www.websocket.org/js/stuff.js (DetectBrowser.js)

function getBrowserInfo() {
    var nVer = navigator.appVersion;
    var nAgt = navigator.userAgent;
    var browserName = navigator.appName;
    var fullVersion = '' + parseFloat(navigator.appVersion);
    var majorVersion = parseInt(navigator.appVersion, 10);
    var nameOffset, verOffset, ix;

    // In Opera, the true version is after 'Opera' or after 'Version'
    if (isOpera) {
        browserName = 'Opera';
        try {
            fullVersion = navigator.userAgent.split('OPR/')[1].split(' ')[0];
            majorVersion = fullVersion.split('.')[0];
        } catch (e) {
            fullVersion = '0.0.0.0';
            majorVersion = 0;
        }
    }
    // In MSIE version <=10, the true version is after 'MSIE' in userAgent
    // In IE 11, look for the string after 'rv:'
    else if (isIE) {
        verOffset = nAgt.indexOf('rv:');
        if (verOffset > 0) { //IE 11
            fullVersion = nAgt.substring(verOffset + 3);
        } else { //IE 10 or earlier
            verOffset = nAgt.indexOf('MSIE');
            fullVersion = nAgt.substring(verOffset + 5);
        }
        browserName = 'IE';
    }
    // In Chrome, the true version is after 'Chrome' 
    else if (isChrome) {
        verOffset = nAgt.indexOf('Chrome');
        browserName = 'Chrome';
        fullVersion = nAgt.substring(verOffset + 7);
    }
    // In Safari, the true version is after 'Safari' or after 'Version' 
    else if (isSafari) {
        verOffset = nAgt.indexOf('Safari');

        browserName = 'Safari';
        fullVersion = nAgt.substring(verOffset + 7);

        if ((verOffset = nAgt.indexOf('Version')) !== -1) {
            fullVersion = nAgt.substring(verOffset + 8);
        }

        if (navigator.userAgent.indexOf('Version/') !== -1) {
            fullVersion = navigator.userAgent.split('Version/')[1].split(' ')[0];
        }
    }
    // In Firefox, the true version is after 'Firefox' 
    else if (isFirefox) {
        verOffset = nAgt.indexOf('Firefox');
        browserName = 'Firefox';
        fullVersion = nAgt.substring(verOffset + 8);
    }

    // In most other browsers, 'name/version' is at the end of userAgent 
    else if ((nameOffset = nAgt.lastIndexOf(' ') + 1) < (verOffset = nAgt.lastIndexOf('/'))) {
        browserName = nAgt.substring(nameOffset, verOffset);
        fullVersion = nAgt.substring(verOffset + 1);

        if (browserName.toLowerCase() === browserName.toUpperCase()) {
            browserName = navigator.appName;
        }
    }

    if (isEdge) {
        browserName = 'Edge';
        fullVersion = navigator.userAgent.split('Edge/')[1];
        // fullVersion = parseInt(navigator.userAgent.match(/Edge\/(\d+).(\d+)$/)[2], 10).toString();
    }

    // trim the fullVersion string at semicolon/space/bracket if present
    if ((ix = fullVersion.search(/[; \)]/)) !== -1) {
        fullVersion = fullVersion.substring(0, ix);
    }

    majorVersion = parseInt('' + fullVersion, 10);

    if (isNaN(majorVersion)) {
        fullVersion = '' + parseFloat(navigator.appVersion);
        majorVersion = parseInt(navigator.appVersion, 10);
    }

    return {
        fullVersion: fullVersion,
        version: majorVersion,
        name: browserName,
        isPrivateBrowsing: false
    };
}