how to detect browsers in javascript.  we are using this for security purposes.

In JavaScript, you can detect the user's browser using the navigator object, which provides information about the user's browser and operating system. Here are some common methods for detecting browsers in JavaScript:

 

<script>

var isOpera = (!!window.opr && !!opr.addons) || !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
var isFirefox = typeof InstallTrigger !== 'undefined';
var isSafari = /constructor/i.test(window.HTMLElement) || (function (p) { return p.toString() === "[object SafariRemoteNotification]"; })(!window['safari'] || (typeof safari !== 'undefined' && window['safari'].pushNotification));
var isIE = /*@cc_on!@*/false || !!document.documentMode;
var isEdge = !isIE && !!window.StyleMedia;
var isChrome = !!window.chrome && (!!window.chrome.webstore || !!window.chrome.runtime);
var isEdgeChromium = isChrome && (navigator.userAgent.indexOf("Edg") != -1);
var isBlink = (isChrome || isOpera) && !!window.CSS;

 
if(isFirefox==true)
{
    var result="Firefox";
}

if(isChrome==true)
{
    var result="Chrome";
}

if(isSafari==true)
{
    var result="Safari";
}

if(isOpera==true)
{
    var result="Opera";
}

if(isIE==true)
{
    var result="IE";
}

if(isEdge==true)
{
    var result="Edge";
}

if(isEdgeChromium==true)
{
    var result="Chromium";
}

alert(result);

</script>

This code uses the userAgent property of the navigator object to retrieve a string that contains information about the user's browser and operating system. It then uses a series of indexOf() checks to determine which browser the user is using.