The list of browsers included in the VSTS 2010 browser list has a decent selection but with the release of IE9 and other browsers it’s already getting out of date. Luckily we can add additional browsers by creating new .browser files in Program Files\Microsoft Visual Studio 10.0\Common7\IDE\Templates\LoadTest\Browsers (Program Files (x86) on 64-bit systems).  The files are simple XML documents that include a name and a few header items such as user agent so there isn’t really anything scary in there.  For example, the definition for IE8 is as follows:

<Browser Name="Internet Explorer 8.0" MaxConnections="6">
  <Headers>
    <Header Name="User-Agent" Value="Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1)" />
    <Header Name="Accept" Value="*/*" />
    <Header Name="Accept-Language" Value="{{$IEAcceptLanguage}}" />
    <Header Name="Accept-Encoding" Value="GZIP" />
  </Headers>
</Browser>

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