title: Open PDF result in browser tab with MVC 3
body: <p>I am using ASP.NET MVC 3. I have a controller action that returns a PDF file like this:</p>
  
  <pre><code>Public Class ReportController
      ...
      Function Generate(id As Integer) As ActionResult
          ...
          Return File(output, "application/pdf", "something.pdf")
          ' "output" is a memory stream
      End Function
  </code></pre>
  
  <p>The code works but Firefox doesn't display the result in a tab, the result is either downloaded or opened with Adobe Reader.</p>
  
  <p>I know that <em>Firefox can display PDF in a tab</em> because I can just google some PDF, click the link, and the PDF will open in a tab.</p>
  
  <p>How do I set up the action so the PDF will open in a tab?</p>