Check Browser

browserCheck.js

// https://stackoverflow.com/a/56361977/4110257
function name() {
  var agent = window.navigator.userAgent.toLowerCase();
  
  switch (true) {
    case agent.indexOf("edge") > -1: return "edge";
    case agent.indexOf("edg") > -1: return "chromium based edge (dev or canary)";
    case agent.indexOf("opr") > -1 && !!window.opr: return "opera";
    case agent.indexOf("chrome") > -1 && !!window.chrome: return "chrome";
    case agent.indexOf("trident") > -1: return "ie";
    case agent.indexOf("firefox") > -1: return "firefox";
    case agent.indexOf("safari") > -1: return "safari";
    default: return "other";
  }
}

// function name() {
//   var browserName = '';
//   var userAgent = navigator.userAgent;
//   (typeof InstallTrigger !== 'undefined') && (browserName = 'Firefox');
//   ( /* @cc_on!@*/ false || !!document.documentMode) && (browserName = 'IE');
//   (!!window.chrome && userAgent.match(/OPR/)) && (browserName = 'Opera');
//   (!!window.chrome && userAgent.match(/Edge/)) && (browserName = 'Edge');
//   (!!window.chrome && !userAgent.match(/(OPR|Edge)/)) && (browserName = 'Chrome');

//   /**
//    * Expected returns
//    * Firefox, Opera, Edge, Chrome
//    */
//   return browserName;
// }

As of 28-July-2020

Working versions:
Firefox - 78.0.2 (64-bit) (detected as Firefox)
Chrome - Version 84.0.4147.105 (Official Build) (64-bit) (detected as Chrome)
Opera - 70.0.3728.71 (detected as Opera)
New Edge Chromium - Version 84.0.522.44 (Official build) (64-bit) (detected as Chrome)
Old Edge - Microsoft Edge 44.19041.1.0 (detected as Edge)
IE - 11.388.19041.0 (version downgraded but jsfiddle does not run anymore but detected as IE)

Fiddle: https://jsfiddle.net/iamdevlinph/1gLxbb6s/30/

Updated code for browser checking using the versions above

https://jsfiddle.net/iamdevlinph/thxkdzbn/6/

Working versions:
Firefox - 78.0.2 (64-bit) (detected as firefox)
Chrome - Version 84.0.4147.105 (Official Build) (64-bit) (detected as chrome)
Opera - 70.0.3728.71 (detected as opera)
New Edge Chromium - Version 84.0.522.44 (Official build) (64-bit) (detected as chromium based edge (dev or canary))
Old Edge - Microsoft Edge 44.19041.1.0 (detected as edge)
IE - 11.388.19041.0 (version downgraded but jsfiddle does not run anymore but detected as ie)
Safari - Version 13.1.1 (14609.2.9.1.3) (detected as safari)