How Can I Reliably Detect a User's Browser for Targeted Addon Installation?

Browser Detection for Targeted Addon Installation

To facilitate the targeted installation of add-ons across various browsers, it's crucial to accurately detect the user's browser. However, relying solely on the User Agent string is insufficient due to its susceptibility to manipulation.

One reliable approach is "duck typing," which detects browsers based on their specific characteristics. This method is more robust and can be applied as follows:

// 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 (based on chromium) detection
var isEdgeChromium = isChrome && (navigator.userAgent.indexOf("Edg") != -1);

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

Remember, browser detection should be utilized judiciously, especially when browser-specific instructions are necessary for addon installation. Prioritize feature detection for improved reliability whenever possible.

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