Merge pull request #5551 from Snuffleupagus/remove-amo-link

Remove the link to the AMO extension from the README

README.md

@@ -31,11 +31,9 @@ irc.mozilla.org.
 
 #### Firefox
 
-PDF.js is built into version 19+ of Firefox, however two extensions are still
+PDF.js is built into version 19+ of Firefox, however one extension is still available:
-available that are updated at a different rate:
 
 + [Development Version](http://mozilla.github.io/pdf.js/extensions/firefox/pdf.js.xpi) - This version is updated every time new code is merged into the PDF.js codebase. This should be quite stable but still might break from time to time.
-+ [Stable Version](https://addons.mozilla.org/firefox/addon/pdfjs) - After version 24 of Firefox is released we no longer plan to support the stable extension. The stable version will then be considered whatever is built into Firefox.
 
 #### Chrome and Opera