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    <p>As already asked in a comment: why do you want this? Browser sniffing is a bad habit and there are only a few situations where it is needed.</p> <p>Instead, use feature detection. As <a href="http://www.nczonline.net/blog/2009/12/29/feature-detection-is-not-browser-detection/" rel="nofollow noreferrer"><strong>described by Nicholas Zakas</strong></a>, you should test relatively 'uncommon' features before using them and only rely on these tests, so you're kind of fail-safe. For example, do</p> <pre><code>if (window.XMLHttpRequest) var xhr = new XMLHttpRequest(); </code></pre> <p>instead of</p> <pre><code>if ((brwsr.IE &amp;&amp; brwsr.IE.version &gt;= 7) || (brwsr.firefox) || (brwsr.opera)) var xhr = new XMLHttpRequest(); </code></pre> <p>And also <strong>don't</strong> do</p> <pre><code>if (window.XMLHttpRequest) // Hey, native XMLHttpRequest-support, so position: fixed is also supported </code></pre> <p>(instead, test if <code>position: fixed</code> is supported)</p> <p>There exist several uncommon browsers with names like <a href="http://en.wikipedia.org/wiki/Kazehakase" rel="nofollow noreferrer">Kazehakase</a> and <a href="http://en.wikipedia.org/wiki/Midori_%28web_browser%29" rel="nofollow noreferrer">Midori</a> that also might, or might not, support these features, so your scripts will silently work on them when using feature detection.</p> <p>But please read the <a href="http://www.nczonline.net/blog/2009/12/29/feature-detection-is-not-browser-detection/" rel="nofollow noreferrer"><strong>mentioned article</strong></a>, as it contains a very good and thorough explanation of this technique. (By the way, I think that Zakas' <a href="http://rads.stackoverflow.com/amzn/click/047022780X" rel="nofollow noreferrer"><em>Professional JavaScript for Web Developers</em></a> is still too unknown.)</p>
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    1. POIn Javascript, how do I determine if my current browser is Firefox on a computer vs everything else?
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    1. COIt'd be nice if this always worked. But sometimes you have a case where features are implemented slightly differently in different browsers, but this difference isn't declared in a variable. For instance, I'm trying to deal with the problem that you can't copy text from disabled fields in firefox, but you can in every other browser. So I need to switch to using the readOnly attribute in firefox. There's no way to detect this other than knowing the user agent.
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