Convert the RSS extension to event pages to avoid a dedicated background process.

chrome/test/data/extensions/subscribe_page_action/popup.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 function feedLink(url) {
   var feed_link = document.createElement('a');
   feed_link.href = url;
   feed_link.addEventListener("click", onClick);
   return feed_link;
 }
 
 function main() {
-  chrome.tabs.getSelected(null, function(tab) {
-    var feeds = chrome.extension.getBackgroundPage().feedData[tab.id];
-    if (feeds.length == 1) {
-      // Only one feed, no need for a bubble; go straight to the subscribe page.
-      preview(feeds[0].href);
-    } else {
-      var content = document.getElementById('content');
-      var heading = document.getElementById('heading');
-      heading.innerText =
-          chrome.i18n.getMessage("rss_subscription_action_title");
-      content.appendChild(document.createElement('br'));
+  chrome.tabs.getSelected(function(tab) {
+    chrome.storage.local.get(tab.id.toString(), function(result) {
+      var feeds = result[tab.id];
+      if (feeds.length == 1) {
+        // Only one feed, no need for a bubble; go straight to the subscribe
+        // page.
+        preview(feeds[0].href);
+      } else {
+        var content = document.getElementById('content');
+        var heading = document.getElementById('heading');
+        heading.innerText =
+            chrome.i18n.getMessage("rss_subscription_action_title");
+        content.appendChild(document.createElement('br'));
 
-      var feed_list = document.createElement('table');
-      feed_list.style.width = "400";
-      for (var i = 0; i < feeds.length; ++i) {
-        // Create an RSS image and the anhor encapsulating it.
-        var img_link = feedLink(feeds[i].href);
-        var img = document.createElement('img');
-        img.src = "feed-icon-16x16.png";
-        img_link.appendChild(img);
+        var feed_list = document.createElement('table');
+        feed_list.style.width = "400";
+        for (var i = 0; i < feeds.length; ++i) {
+          // Create an RSS image and the anhor encapsulating it.
+          var img_link = feedLink(feeds[i].href);
+          var img = document.createElement('img');
+          img.src = "feed-icon-16x16.png";
+          img_link.appendChild(img);
 
-        // Create a text node and the anchor encapsulating it.
-        var text_link = feedLink(feeds[i].href);
-        text_link.appendChild(document.createTextNode(feeds[i].title));
+          // Create a text node and the anchor encapsulating it.
+          var text_link = feedLink(feeds[i].href);
+          text_link.appendChild(document.createTextNode(feeds[i].title));
 
-        // Add the data to a row in the table.
-        var tr = document.createElement('tr');
-        tr.className = "feedList";
-        var td = document.createElement('td');
-        td.width = "16";
-        td.appendChild(img_link);
-        var td2 = document.createElement('td');
-        td2.appendChild(text_link);
-        tr.appendChild(td);
-        tr.appendChild(td2);
-        feed_list.appendChild(tr);
+          // Add the data to a row in the table.
+          var tr = document.createElement('tr');
+          tr.className = "feedList";
+          var td = document.createElement('td');
+          td.width = "16";
+          td.appendChild(img_link);
+          var td2 = document.createElement('td');
+          td2.appendChild(text_link);
+          tr.appendChild(td);
+          tr.appendChild(td2);
+          feed_list.appendChild(tr);
+        }
+
+        content.appendChild(feed_list);
       }
-
-      content.appendChild(feed_list);
-    }
+    });
   });
 }
 
 function onClick(event) {
   var a = event.currentTarget;
   preview(a.href);
 }
 
 function preview(feed_url) {
   // See if we need to skip the preview page and subscribe directly.
   var url = "";
   if (window.localStorage && window.localStorage.showPreviewPage == "No") {
     // Skip the preview.
     url = window.localStorage.defaultReader.replace("%s", escape(feed_url));
   } else {
     // Show the preview page.
     url = "subscribe.html?" + encodeURIComponent(feed_url);
   }
   chrome.tabs.create({ url: url });
   window.close();
 }
 
 // Init on DOM ready.
 document.addEventListener('DOMContentLoaded', main);