diff --git a/browser/components/migration/content/migration.js b/browser/components/migration/content/migration.js
index 7a380624c8f4..6291da4fdee5 100644
--- a/browser/components/migration/content/migration.js
+++ b/browser/components/migration/content/migration.js
@@ -37,6 +37,8 @@
 const kIMig = Components.interfaces.nsIBrowserProfileMigrator;
 const kIPStartup = Components.interfaces.nsIProfileStartup;
 const kProfileMigratorContractIDPrefix = "@mozilla.org/profile/migrator;1?app=browser&type=";
+const Cc = Components.classes;
+const Ci = Components.interfaces;
 
 var MigrationWizard = {
   _source: "",                  // Source Profile Migrator ContractID suffix
@@ -54,6 +56,7 @@ var MigrationWizard = {
     os.addObserver(this, "Migration:Started", false);
     os.addObserver(this, "Migration:ItemBeforeMigrate", false);
     os.addObserver(this, "Migration:ItemAfterMigrate", false);
+    os.addObserver(this, "Migration:ItemError", false);
     os.addObserver(this, "Migration:Ended", false);
 
     this._wiz = document.documentElement;
@@ -81,6 +84,7 @@ var MigrationWizard = {
     os.removeObserver(this, "Migration:Started");
     os.removeObserver(this, "Migration:ItemBeforeMigrate");
     os.removeObserver(this, "Migration:ItemAfterMigrate");
+    os.removeObserver(this, "Migration:ItemError");
     os.removeObserver(this, "Migration:Ended");
   },
 
@@ -489,6 +493,35 @@ var MigrationWizard = {
         nextButton.click();
       }
       break;
+    case "Migration:ItemError":
+      var type = "undefined";
+      switch (parseInt(aData)) {
+      case Ci.nsIBrowserProfileMigrator.SETTINGS:
+        type = "settings";
+        break;
+      case Ci.nsIBrowserProfileMigrator.COOKIES:
+        type = "cookies";
+        break;
+      case Ci.nsIBrowserProfileMigrator.HISTORY:
+        type = "history";
+        break;
+      case Ci.nsIBrowserProfileMigrator.FORMDATA:
+        type = "form data";
+        break;
+      case Ci.nsIBrowserProfileMigrator.PASSWORDS:
+        type = "passwords";
+        break;
+      case Ci.nsIBrowserProfileMigrator.BOOKMARKS:
+        type = "bookmarks";
+        break;
+      case Ci.nsIBrowserProfileMigrator.OTHERDATA:
+        type = "misc. data";
+        break;
+      }
+      Cc["@mozilla.org/consoleservice;1"]
+        .getService(Ci.nsIConsoleService)
+        .logStringMessage("some " + type + " did not successfully migrate.");
+      break;
     }
   },
 
diff --git a/browser/components/migration/src/nsBrowserProfileMigratorUtils.h b/browser/components/migration/src/nsBrowserProfileMigratorUtils.h
index 21e81280258f..4ced547a2141 100644
--- a/browser/components/migration/src/nsBrowserProfileMigratorUtils.h
+++ b/browser/components/migration/src/nsBrowserProfileMigratorUtils.h
@@ -39,6 +39,7 @@
 #define browserprofilemigratorutils___h___
 
 #define MIGRATION_ITEMBEFOREMIGRATE "Migration:ItemBeforeMigrate"
+#define MIGRATION_ITEMMIGRATEERROR  "Migration:ItemError"
 #define MIGRATION_ITEMAFTERMIGRATE  "Migration:ItemAfterMigrate"
 #define MIGRATION_STARTED           "Migration:Started"
 #define MIGRATION_ENDED             "Migration:Ended"
@@ -47,11 +48,12 @@
   mObserverService->NotifyObservers(nsnull, message, item)
 
 #define COPY_DATA(func, replace, itemIndex) \
-  if (NS_SUCCEEDED(rv) && (aItems & itemIndex || !aItems)) { \
+  if ((aItems & itemIndex || !aItems)) { \
     nsAutoString index; \
     index.AppendInt(itemIndex); \
     NOTIFY_OBSERVERS(MIGRATION_ITEMBEFOREMIGRATE, index.get()); \
-    rv = func(replace); \
+    if (NS_FAILED(func(replace))) \
+      NOTIFY_OBSERVERS(MIGRATION_ITEMMIGRATEERROR, index.get()); \
     NOTIFY_OBSERVERS(MIGRATION_ITEMAFTERMIGRATE, index.get()); \
   }