Deprecate Firefox web app

https://wiki.mozilla.org/Marketplace/FutureofMarketplaceFAQ

assets/javascripts/news.json

@@ -147,7 +147,7 @@
     "New <a href=\"/d3/\">D3.js</a> and <a href=\"/knockout/\">Knockout.js</a> documentations"
   ], [
     "2014-01-18",
-    "DevDocs is now available as a <a href=\"https://marketplace.firefox.com/app/devdocs/\">Firefox web app</a> (currently requires Aurora)."
+    "DevDocs is now available as a <a href=\"https://marketplace.firefox.com/app/devdocs/\">Firefox web app</a>."
   ], [
     "2014-01-12",
     "Added <code class=\"_label\">alt + g</code> shortcut for searching on Google.",

assets/javascripts/templates/pages/about_tmpl.coffee

@@ -67,7 +67,6 @@ app.templates.aboutPage = -> """
   <h2 class="_lined-heading" id="plugins">Plugins and Extensions</h2>
   <ul>
     <li><a href="https://chrome.google.com/webstore/detail/devdocs/mnfehgbmkapmjnhcnbodoamcioleeooe">Chrome web app</a>
-    <li><a href="https://marketplace.firefox.com/app/devdocs/">Firefox web app</a>
     <li><a href="https://sublime.wbond.net/packages/DevDocs">Sublime Text plugin</a>
     <li><a href="https://atom.io/packages/devdocs">Atom plugin</a>
     <li><a href="https://github.com/gruehle/dev-docs-viewer">Brackets extension</a>

assets/javascripts/templates/pages/root_tmpl.coffee.erb

@@ -37,7 +37,7 @@ app.templates.intro = """
       <li>The search supports fuzzy matching (e.g. "bgcp" brings up "background-clip")
       <li>To search a specific documentation, type its name (or an abbreviation), then Tab
       <li>You can search using your browser's address bar &mdash; <a href="/help#browser_search">learn how</a>
-      <li>DevDocs works <a href="/offline">offline</a>, on mobile, and can be installed on <a href="https://chrome.google.com/webstore/detail/devdocs/mnfehgbmkapmjnhcnbodoamcioleeooe">Chrome</a> and <a href="https://marketplace.firefox.com/app/devdocs/">Firefox</a>.
+      <li>DevDocs works <a href="/offline">offline</a>, on mobile, and can be installed on <a href="https://chrome.google.com/webstore/detail/devdocs/mnfehgbmkapmjnhcnbodoamcioleeooe">Chrome</a>.
       <li>For the latest news, follow <a href="https://twitter.com/DevDocs">@DevDocs</a>
       <li>DevDocs is free and <a href="https://github.com/Thibaut/devdocs">open source</a>
           <iframe class="_github-btn" src="//ghbtns.com/github-btn.html?user=Thibaut&repo=devdocs&type=watch&count=true" allowtransparency="true" frameborder="0" scrolling="0" width="100" height="20"></iframe>