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The embedded Mozilla browser in Second Life identifies itself with a special user agent string.  The format of this string has changed over the years.  The user agent strings in 1.20 RC13 and beyond should conform to the HTTP 1.1 specification ([http://www.w3.org/Protocols/rfc2616/rfc2616.html RFC 2616]).

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// As of 1.20.13
Mozilla/5.0 (Windows; U; Windows NT 5.1; chrome://navigator/locale/navigator.properties; rv:1.8.1.13) Gecko/20080314 SecondLife/1.20.13.0 (Second Life Release; default skin)

// As of 1.18.2.1
Mozilla/5.0 (Windows; U; Windows NT 5.1; chrome://navigator/locale/navigator.properties; rv:1.8.0.12) Gecko/20070605 [Second Life (Second Life Release) - 1.18.2.1]

// Prior to 1.18.2.1
Mozilla/5.0 (Windows; U; Windows NT 5.1; chrome://navigator/locale/navigator.properties; rv:1.8.0.12) Gecko/20070605 [Second Life 1.18.2.1]
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