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

chrome/test/data/extensions/subscribe_page_action/background.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.
 
 // A dictionary keyed off of tabId that keeps track of data per tab (for
 // example what feedUrl was detected in the tab).
 var feedData = {};

[not at google - send to devlin, 2013/03/26 15:25:38]

when the event page unloads this will be lost, but what is it used for?

 
-chrome.extension.onRequest.addListener(function(request, sender) {
+chrome.extension.onMessage.addListener(function(request, sender) {
   if (request.msg == "feedIcon") {
     // First validate that all the URLs have the right schema.
     var input = [];
     for (var i = 0; i < request.feeds.length; ++i) {
       var a = document.createElement('a');
       a.href = request.feeds[i].href;
       if (a.protocol == "http:" || a.protocol == "https:") {
         input.push(request.feeds[i]);
       } else {
         console.log('Warning: feed source rejected (wrong protocol): ' +
@@ skipping 27 matching lines @@
         });
     var url = "subscribe.html?" + encodeURIComponent(request.href);
     url = chrome.extension.getURL(url);
     chrome.tabs.create({ url: url, index: sender.tab.index });
   }
 });
 
 chrome.tabs.onRemoved.addListener(function(tabId) {
   delete feedData[tabId];
 });