--- a/suite/common/bookmarks/bookmarksManager.js
+++ b/suite/common/bookmarks/bookmarksManager.js
@@ -755,19 +755,17 @@ var PlacesOrganizer = {
     // Get the place: uri for the query.
     // If the advanced query builder is showing, use that.
     var options = this.getCurrentOptions();
     var queries = this.getCurrentQueries();
 
     var placeSpec = PlacesUtils.history.queriesToQueryString(queries,
                                                              queries.length,
                                                              options);
-    var placeURI = Components.classes["@mozilla.org/network/io-service;1"]
-                             .getService(Components.interfaces.nsIIOService)
-                             .newURI(placeSpec, null, null);
+    var placeURI = Services.io.newURI(placeSpec, null, null);
 
     // Prompt the user for a name for the query.
     // XXX - using prompt service for now; will need to make
     // a real dialog and localize when we're sure this is the UI we want.
     var title = PlacesUIUtils.getString("saveSearch.title");
     var inputLabel = PlacesUIUtils.getString("saveSearch.inputLabel");
     var defaultText = PlacesUIUtils.getString("saveSearch.inputDefaultText");
 

--- a/suite/common/contentAreaClick.js
+++ b/suite/common/contentAreaClick.js
@@ -299,18 +299,8 @@
     // Remove any expired history items so that we don't let
     // this grow without bound.
     connection.executeSimpleSQL(
         "DELETE FROM urlbarhistory WHERE ROWID NOT IN " +
           "(SELECT ROWID FROM urlbarhistory ORDER BY ROWID DESC LIMIT 30)");
     connection.commitTransaction();
     connection.close();
   }
-
-  function makeURLAbsolute(base, url)
-  {
-    // Construct nsIURL.
-    var ioService = Components.classes["@mozilla.org/network/io-service;1"]
-                              .getService(Components.interfaces.nsIIOService);
-    var baseURI  = ioService.newURI(base, null, null);
-
-    return ioService.newURI(baseURI.resolve(url), null, null).spec;
-  }

--- a/suite/common/downloads/downloadmanager.js
+++ b/suite/common/downloads/downloadmanager.js
@@ -244,19 +244,17 @@ function openDownload(aDownload)
     }
   } catch (ex) { }
 
   try {
     file.launch();
   } catch (ex) {
     // If launch fails, try sending it through the system's external
     // file: URL handler
-    var uri = Components.classes["@mozilla.org/network/io-service;1"]
-                        .getService(Components.interfaces.nsIIOService)
-                        .newFileURI(file);
+    var uri = Services.io.newFileURI(file);
     var protocolSvc = Components.classes["@mozilla.org/uriloader/external-protocol-service;1"]
                                 .getService(Components.interfaces.nsIExternalProtocolService);
     protocolSvc.loadUrl(uri);
   }
 }
 
 function showDownload(aDownload)
 {
@@ -271,19 +269,17 @@ function showDownload(aDownload)
     var parent = file.parent.QueryInterface(Components.interfaces.nsILocalFile);
 
     try {
       // "Double click" the parent directory to show where the file should be
       parent.launch();
     } catch (e) {
       // If launch also fails (probably because it's not implemented), let the
       // OS handler try to open the parent
-      var uri = Components.classes["@mozilla.org/network/io-service;1"]
-                          .getService(Components.interfaces.nsIIOService)
-                          .newFileURI(parent);
+      var uri = Services.io.newFileURI(parent);
       var protocolSvc = Components.classes["@mozilla.org/uriloader/external-protocol-service;1"]
                                   .getService(Components.interfaces.nsIExternalProtocolService);
       protocolSvc.loadUrl(uri);
     }
   }
 }
 
 function showProperties(aDownloadID)

--- a/suite/common/history/history.js
+++ b/suite/common/history/history.js
@@ -39,17 +39,16 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
 var gHistoryTree;
 var gLastHostname;
 var gLastDomain;
 var gSearchBox;
 var gPrefService;
-var gIOService;
 var gDeleteByHostname;
 var gDeleteByDomain;
 var gHistoryStatus;
 var gHistoryGrouping = "day";
 
 function HistoryCommonInit()
 {
   gHistoryTree = document.getElementById("historyTree");
@@ -92,20 +91,17 @@ function historyOnSelect()
   gLastDomain = null;
   var url = null;
 
   var selectedNode = gHistoryTree.selectedNode;
   if (selectedNode) {
     if (PlacesUtils.nodeIsURI(selectedNode)) {
       try {
         url = selectedNode.uri;
-        if (!gIOService)
-          gIOService = Components.classes["@mozilla.org/network/io-service;1"]
-                                 .getService(Components.interfaces.nsIIOService);
-        gLastHostname = gIOService.newURI(url, null, null).host;
+        gLastHostname = Services.io.newURI(url, null, null).host;
       } catch (e) {}
     } else if (PlacesUtils.nodeIsHost(selectedNode)) {
       gLastHostname = selectedNode.title;
     }
     if (gLastHostname) {
       try {
         gLastDomain = Services.eTLD.getBaseDomainFromHost(gLastHostname);
       } catch (e) {}

--- a/suite/common/nsContextMenu.js
+++ b/suite/common/nsContextMenu.js
@@ -516,17 +516,17 @@ nsContextMenu.prototype = {
       }
       else if ( this.target instanceof HTMLHtmlElement ) {
         // pages with multiple <body>s are lame. we'll teach them a lesson.
         var bodyElt = this.target.ownerDocument.body;
         if (bodyElt) {
           var computedURL = this.getComputedURL(bodyElt, "background-image");
           if (computedURL) {
             this.hasBGImage = true;
-            this.bgImageURL = this.makeURLAbsolute(bodyElt.baseURI, computedURL);
+            this.bgImageURL = makeURLAbsolute(bodyElt.baseURI, computedURL);
           }
         }
       }
       else if ("HTTPIndex" in content &&
                content.HTTPIndex instanceof Components.interfaces.nsIHTTPIndex) {
         this.inDirList = true;
         // Bubble outward till we get to an element with URL attribute
         // (which should be the href).
@@ -626,17 +626,17 @@ nsContextMenu.prototype = {
 
         // Background image?  Don't bother if we've already found a
         // background image further down the hierarchy.  Otherwise,
         // we look for the computed background-image style.
         if (!this.hasBGImage) {
           var bgImgUrl = this.getComputedURL(elem, "background-image");
           if (bgImgUrl) {
             this.hasBGImage = true;
-            this.bgImageURL = this.makeURLAbsolute(elem.baseURI, bgImgUrl);
+            this.bgImageURL = makeURLAbsolute(elem.baseURI, bgImgUrl);
           }
         }
       }
       elem = elem.parentNode;
     }
   },
 
   initPopupURL: function() {
@@ -658,23 +658,17 @@ nsContextMenu.prototype = {
           CI.nsIWindowCreator2.PARENT_IS_LOADING_OR_RUNNING_TIMEOUT) {
         // do the pref settings allow site-by-site popup management?
         const PB = Components.classes["@mozilla.org/preferences-service;1"]
                    .getService(CI.nsIPrefBranch);
         show = !PB.getBoolPref("dom.disable_open_during_load");
       }
       if (show) {
         // initialize popupURL
-        const IOS = Components.classes["@mozilla.org/network/io-service;1"]
-                    .getService(CI.nsIIOService);
-        this.popupURL = IOS.newURI(window.content.opener.location.href, null, null);
-
-        // but cancel if it's an unsuitable URL
-        const PM = Components.classes["@mozilla.org/PopupWindowManager;1"]
-                   .getService(CI.nsIPopupWindowManager);
+        this.popupURL = Services.io.newURI(window.content.opener.location.href, null, null);
       }
     } catch(e) {
     }
   },
 
   // Returns the computed style attribute for the given element.
   getComputedStyle: function(aElem, aProp) {
     return aElem.ownerDocument
@@ -980,19 +974,17 @@ nsContextMenu.prototype = {
     // If we don't have the headers after a short time the user won't have
     // received any feedback from the click. That's bad, so we give up
     // waiting for the filename.
     function timerCallback() {
       channel.cancel(NS_ERROR_SAVE_LINK_AS_TIMEOUT);
     }
 
     // set up a channel to do the saving
-    var ioService = Components.classes["@mozilla.org/network/io-service;1"]
-                              .getService(Components.interfaces.nsIIOService);
-    var channel = ioService.newChannel(linkURL, null, null);
+    var channel = Services.io.newChannel(linkURL, null, null);
     channel.notificationCallbacks = new Callbacks();
     channel.loadFlags |= Components.interfaces.nsIRequest.LOAD_BYPASS_CACHE |
                          Components.interfaces.nsIChannel.LOAD_CALL_CONTENT_SNIFFERS;
     if (channel instanceof Components.interfaces.nsIHttpChannel) {
       channel.referrer = doc.documentURIObject;
       if (channel instanceof Components.interfaces.nsIHttpChannelInternal)
         channel.forceAllowThirdPartyCookie = true;
     }
@@ -1202,17 +1194,17 @@ nsContextMenu.prototype = {
         text = this.link.getAttribute("alt");
         if (!text || !text.match(/\S/)) {
           if (this.link.href) {
             text = this.link.href;
           }
           else {
             text = getAttributeNS("http://www.w3.org/1999/xlink", "href");
             if (text && text.match(/\S/)) {
-              text = this.makeURLAbsolute(this.link.baseURI, text);
+              text = makeURLAbsolute(this.link.baseURI, text);
             }
           }
         }
       }
     }
 
     return text;
   },
@@ -1278,26 +1270,16 @@ nsContextMenu.prototype = {
       return true;
 
     for (var node = this.target; node; node = node.parentNode)
       if (node instanceof Components.interfaces.nsIDOMNSHTMLElement)
         return node.isContentEditable;
     return false;
   },
 
-  // Convert relative URL to absolute, using document's <base>.
-  makeURLAbsolute: function(aBase, aUrl) {
-    // Construct nsIURL.
-    var ioService = Components.classes["@mozilla.org/network/io-service;1"]
-                              .getService(Components.interfaces.nsIIOService);
-    var baseURI  = ioService.newURI(aBase, null, null);
-
-    return ioService.newURI(baseURI.resolve(aUrl), null, null).spec;
-  },
-
   toString: function() {
     return "contextMenu.target     = " + this.target + "\n" +
            "contextMenu.onImage    = " + this.onImage + "\n" +
            "contextMenu.onLink     = " + this.onLink + "\n" +
            "contextMenu.link       = " + this.link + "\n" +
            "contextMenu.inFrame    = " + this.inFrame + "\n" +
            "contextMenu.hasBGImage = " + this.hasBGImage + "\n";
   },

--- a/suite/common/pref/pref-applications.js
+++ b/suite/common/pref/pref-applications.js
@@ -65,18 +65,16 @@ const nsIPropertyBag = Components.interf
 var handlerSvc = Components.classes["@mozilla.org/uriloader/handler-service;1"]
                            .getService(Components.interfaces.nsIHandlerService);
 var prefSvc = Components.classes["@mozilla.org/preferences-service;1"]
                         .getService(Components.interfaces.nsIPrefBranch2);
 var categoryMgr = Components.classes["@mozilla.org/categorymanager;1"]
                             .getService(Components.interfaces.nsICategoryManager);
 var mimeSvc = Components.classes["@mozilla.org/mime;1"]
                         .getService(Components.interfaces.nsIMIMEService);
-var ioSvc = Components.classes["@mozilla.org/network/io-service;1"]
-                      .getService(Components.interfaces.nsIIOService);
 var converterSvc = Components.classes["@mozilla.org/embeddor.implemented/web-content-handler-registrar;1"]
                              .getService(Components.interfaces.nsIWebContentConverterService);
 var shellSvc = null;
 if ("@mozilla.org/suite/shell-feed-service;1" in Components.classes)
   shellSvc = Components.classes["@mozilla.org/suite/shell-feed-service;1"]
                        .getService(Components.interfaces.nsIShellService);
 
 const TYPE_MAYBE_FEED = "application/vnd.mozilla.maybe.feed";
@@ -1760,25 +1758,25 @@ var gApplicationsPane = {
         return this._getIconURLForWebApp(aHandlerApp.uri)
     }
 
     // We know nothing about other kinds of handler apps.
     return "";
   },
 
   _getIconURLForFile: function(aFile) {
-    var fph = ioSvc.getProtocolHandler("file")
-                   .QueryInterface(Components.interfaces.nsIFileProtocolHandler);
+    var fph = Services.io.getProtocolHandler("file")
+                         .QueryInterface(Components.interfaces.nsIFileProtocolHandler);
     var urlSpec = fph.getURLSpecFromFile(aFile);
 
     return "moz-icon://" + urlSpec + "?size=16";
   },
 
   _getIconURLForWebApp: function(aWebAppURITemplate) {
-    var uri = ioSvc.newURI(aWebAppURITemplate, null, null);
+    var uri = Services.io.newURI(aWebAppURITemplate, null, null);
 
     // Unfortunately we need to use favicon.ico here, but we don't know
     // about any other possibility to retrieve an icon for the web app/site
     // without loading a specific full URL and parsing it for a possible
     // shortcut icon.
 
     return /^https?/.test(uri.scheme) ? uri.resolve("/favicon.ico") : "";
   },

--- a/suite/common/pref/pref-download.js
+++ b/suite/common/pref/pref-download.js
@@ -41,20 +41,18 @@
 const kDesktop = 0;
 const kDownloads = 1;
 const kUserDir = 2;
 var gFPHandler;
 
 function Startup()
 {
   // Define globals
-  gFPHandler = Components.classes["@mozilla.org/network/io-service;1"]
-                         .getService(Components.interfaces.nsIIOService)
-                         .getProtocolHandler("file")
-                         .QueryInterface(Components.interfaces.nsIFileProtocolHandler);
+  gFPHandler = Services.io.getProtocolHandler("file")
+                          .QueryInterface(Components.interfaces.nsIFileProtocolHandler);
 
   SetSoundEnabled(document.getElementById("browser.download.finished_download_sound").value);
 
   // if we don't have the alert service, hide the pref UI for using alerts to
   // notify on download completion
   // see bug #158711
   var downloadDoneNotificationAlertUI = document.getElementById("finishedNotificationAlert");
   downloadDoneNotificationAlertUI.hidden = !("@mozilla.org/alerts-service;1" in Components.classes);

--- a/suite/common/sidebar/sidebarOverlay.js
+++ b/suite/common/sidebar/sidebarOverlay.js
@@ -865,20 +865,17 @@ function check_for_missing_panels() {
   var currHeader;
   var currTab;
   for (var i = 2; i < tabs.length; i += 2) {
     currHeader = tabs[i];
     currTab = new sbPanel(currHeader.getAttribute("id"), currHeader, i);
     if (!currTab.is_excluded()) {
       if (currHeader.hasAttribute("prereq") && currHeader.getAttribute("prereq") != "") {
         var prereq_file = currHeader.getAttribute("prereq");
-        var ioService = Components.classes["@mozilla.org/network/io-service;1"]
-                                  .getService(Components.interfaces.nsIIOService);      
-        var uri = ioService.newURI(prereq_file, null, null);
-        var channel = ioService.newChannelFromURI(uri);
+        var channel = Services.io.newChannel(prereq_file, null, null);
         try {
           channel.open();
         }
         catch(ex if (ex.result == NS_ERROR_FILE_NOT_FOUND)) {
           sidebarObj.datasource.Assert(RDF.GetResource(currHeader.getAttribute("id")),
                                        RDF.GetResource(NC + "exclude"),
                                        RDF.GetLiteral(sidebarObj.component),
                                        true);
@@ -935,18 +932,17 @@ function sidebar_revert_to_default_panel
   }
   return null;
 }
 
 function get_sidebar_datasource_uri() {
   try {
     var sidebar_file = sidebar_get_panels_file();
     
-    var ioService = Components.classes["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService);
-    var fileHandler = ioService.getProtocolHandler("file").QueryInterface(Components.interfaces.nsIFileProtocolHandler);
+    var fileHandler = Services.io.getProtocolHandler("file").QueryInterface(Components.interfaces.nsIFileProtocolHandler);
     
     return fileHandler.getURLSpecFromFile(sidebar_file);
   } catch (ex) {
     // This should not happen
     debug("Error: Unable to load panels file.\n");
   }
   return null;
 }

--- a/suite/common/utilityOverlay.js
+++ b/suite/common/utilityOverlay.js
@@ -965,16 +965,23 @@ function isElementVisible(aElement)
     return false;
 
   // If aElement or a direct or indirect parent is hidden or collapsed,
   // height, width or both will be 0.
   var bo = aElement.boxObject;
   return (bo.height > 0 && bo.width > 0);
 }
 
+function makeURLAbsolute(aBase, aUrl)
+{
+  // Construct nsIURL.
+  return Services.io.newURI(aUrl, null,
+                            Services.io.newURI(aBase, null, null)).spec;
+}
+
 function openAsExternal(aURL)
 {
   var loadType = Services.prefs.getIntPref("browser.link.open_external");
   var loadInBackground = Services.prefs.getBoolPref("browser.tabs.loadDivertedInBackground");
   openNewTabWindowOrExistingWith(loadType, aURL, null, loadInBackground);
 }
 
 /**