update README

README.md

@@ -1,7 +1,14 @@
+# pdf.js
+
 pdf.js is a technology demonstrator prototype to explore whether the HTML5
 platform is complete enough to faithfully and efficiently render the ISO
 32000-1:2008 Portable Document Format (PDF) without native code assistance.
 
+pdf.js is not currently part of the Mozilla project, and there is no plan
+yet to integrate it into Firefox. We will explore that possibility once
+pdf.js is production ready. Until then we aim to publish a Firefox
+PDF reader extension powered by pdf.js.
+
 You can read more about pdf.js here:
 
 http://andreasgal.com/2011/06/15/pdf-js/