User could use the window.navigator.UserAgent to check whether the browser is Microsoft Edge(Chromium), Microsoft Edge, IE, FireFox, Safari or Chrome.
JavaScript code as below:
<script>
var browser = (function (agent) {
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";
}
})(window.navigator.userAgent.toLowerCase());
document.body.innerHTML = window.navigator.userAgent.toLowerCase() + "<br>" + browser;</script> Browser Agent strings example :
The Edge browser userAgent: mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/64.0.3282.140 safari/537.36 edge/18.17763 The Microsoft Chromium Edge Dev userAgent: mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/76.0.3800.0 safari/537.36 edg/76.0.167.1 The Microsoft Chromium Edge Canary userAgent: mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/76.0.3800.0 safari/537.36 edg/76.0.167.1 The IE browser userAgent: mozilla/5.0 (windows nt 10.0; wow64; trident/7.0; .net4.0c; .net4.0e; rv:11.0) like gecko The Chrome browser userAgent: mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/74.0.3729.169 safari/537.36
[Warning]
If your site is being targeted for UA string overrides by the browser, you may not be able to use userAgent to detect the browser correctly depending on what those overrides show.