Как определить браузер с помощью Javascript?

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// Opera 8.0+
var isOpera = (!!window.opr && !!opr.addons) || !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;

// Firefox 1.0+
var isFirefox = typeof InstallTrigger !== 'undefined';

// Safari 3.0+ "[object HTMLElementConstructor]" 
var isSafari = /constructor/i.test(window.HTMLElement) || (function (p) { return p.toString() === "[object SafariRemoteNotification]"; })(!window['safari'] || (typeof safari !== 'undefined' && window['safari'].pushNotification));

// Internet Explorer 6-11
var isIE = /*@cc_on!@*/false || !!document.documentMode;

// Edge 20+
var isEdge = !isIE && !!window.StyleMedia;

// Chrome 1 - 79
var isChrome = !!window.chrome && (!!window.chrome.webstore || !!window.chrome.runtime);

// Edge основываясь на Chromium движок
var isEdgeChromium = isChrome && (navigator.userAgent.indexOf("Edg") != -1);

// Blink
var isBlink = (isChrome || isOpera) && !!window.CSS;

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if (navigator.userAgent.indexOf('Chrome') !== -1) {
  console.log('Google Chrome');
} else if (navigator.userAgent.indexOf('Firefox') !== -1) {
  console.log('Mozilla Firefox');
} else if (navigator.userAgent.indexOf('Safari') !== -1) {
  console.log('Apple Safari');
} else if (navigator.userAgent.indexOf('MSIE') !== -1 || navigator.appVersion.indexOf('Trident/') > 0) {
  console.log('Internet Explorer');
} else {
  console.log('Other');
}

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const browser = bowser.getParser(navigator.userAgent);
console.log(browser.getBrowserName());