--- a/browser/components/nsBrowserGlue.js
+++ b/browser/components/nsBrowserGlue.js
@@ -1106,16 +1106,22 @@ BrowserGlue.prototype = {
         Cu.reportError(ex);
       }
     }, 3000);
 
     // It's important that SafeBrowsing is initialized reasonably
     // early, so we use a maximum timeout for it.
     Services.tm.idleDispatchToMainThread(() => {
       SafeBrowsing.init();
+
+      // Login reputation depends on the Safe Browsing API.
+      if (Services.prefs.getBoolPref("browser.safebrowsing.passwords.enabled")) {
+        Cc["@mozilla.org/reputationservice/login-reputation-service;1"]
+        .getService(Ci.ILoginReputationService);
+      }
     }, 5000);
 
     if (AppConstants.MOZ_CRASHREPORTER) {
       UnsubmittedCrashHandler.scheduleCheckForUnsubmittedCrashReports();
     }
 
     if (AppConstants.platform == "win") {
       Services.tm.idleDispatchToMainThread(() => {

--- a/toolkit/components/build/nsToolkitCompsCID.h
+++ b/toolkit/components/build/nsToolkitCompsCID.h
@@ -176,16 +176,22 @@
 #endif
 
 #define NS_APPLICATION_REPUTATION_SERVICE_CONTRACTID \
   "@mozilla.org/reputationservice/application-reputation-service;1"
 
 #define NS_APPLICATION_REPUTATION_SERVICE_CID \
 { 0xd21b4c33, 0x716f, 0x4117, { 0x80, 0x41, 0x27, 0x70, 0xb5, 0x9f, 0xf8, 0xa6 } }
 
+#define NS_LOGIN_REPUTATION_SERVICE_CONTRACTID \
+  "@mozilla.org/reputationservice/login-reputation-service;1"
+
+#define NS_LOGIN_REPUTATION_SERVICE_CID \
+{ 0x91fa9e67, 0x1427, 0x4ee9, { 0x8e, 0xe0, 0x1a, 0x6e, 0xd5, 0x78, 0xbe, 0xe1 } }
+
 #define NS_ADDONCONTENTPOLICY_CID \
 { 0xc26a8241, 0xecf4, 0x4aed, { 0x9f, 0x3c, 0xf1, 0xf5, 0xc7, 0x13, 0xb9, 0xa5 } }
 
 #define NS_ADDON_PATH_SERVICE_CID \
 { 0xa39f39d0, 0xdfb6, 0x11e3, { 0x8b, 0x68, 0x08, 0x00, 0x20, 0x0c, 0x9a, 0x66 } }
 
 #define NS_ADDON_POLICY_SERVICE_CID \
 { 0x562de129, 0x8338, 0x482c, { 0xbb, 0x96, 0xa1, 0xff, 0x09, 0xee, 0x53, 0xcc } }

--- a/toolkit/components/build/nsToolkitCompsModule.cpp
+++ b/toolkit/components/build/nsToolkitCompsModule.cpp
@@ -21,16 +21,17 @@
 
 #include "nsDownloadManager.h"
 #include "DownloadPlatform.h"
 #include "rdf.h"
 
 #include "nsTypeAheadFind.h"
 
 #include "ApplicationReputation.h"
+#include "LoginReputation.h"
 #include "nsUrlClassifierDBService.h"
 #include "nsUrlClassifierStreamUpdater.h"
 #include "nsUrlClassifierUtils.h"
 #include "nsUrlClassifierPrefixSet.h"
 
 #include "nsBrowserStatusFilter.h"
 #include "mozilla/FinalizationWitnessService.h"
 #include "mozilla/NativeOSFileInternals.h"
@@ -86,16 +87,18 @@ NS_GENERIC_FACTORY_CONSTRUCTOR(nsAlertsS
 NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(nsDownloadManager,
                                          nsDownloadManager::GetSingleton)
 NS_GENERIC_FACTORY_CONSTRUCTOR(DownloadPlatform)
 
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsTypeAheadFind)
 
 NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(ApplicationReputationService,
                                          ApplicationReputationService::GetSingleton)
+NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(LoginReputationService,
+                                         LoginReputationService::GetSingleton)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsUrlClassifierPrefixSet)
 NS_GENERIC_FACTORY_CONSTRUCTOR(nsUrlClassifierStreamUpdater)
 NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(nsUrlClassifierUtils, Init)
 
 static nsresult
 nsUrlClassifierDBServiceConstructor(nsISupports *aOuter, REFNSIID aIID,
                                     void **aResult)
 {
@@ -141,16 +144,17 @@ NS_DEFINE_NAMED_CID(NS_ALERTSSERVICE_CID
 #if !defined(MOZ_DISABLE_PARENTAL_CONTROLS)
 NS_DEFINE_NAMED_CID(NS_PARENTALCONTROLSSERVICE_CID);
 #endif
 NS_DEFINE_NAMED_CID(NS_DOWNLOADMANAGER_CID);
 NS_DEFINE_NAMED_CID(NS_DOWNLOADPLATFORM_CID);
 NS_DEFINE_NAMED_CID(NS_FIND_SERVICE_CID);
 NS_DEFINE_NAMED_CID(NS_TYPEAHEADFIND_CID);
 NS_DEFINE_NAMED_CID(NS_APPLICATION_REPUTATION_SERVICE_CID);
+NS_DEFINE_NAMED_CID(NS_LOGIN_REPUTATION_SERVICE_CID);
 NS_DEFINE_NAMED_CID(NS_URLCLASSIFIERPREFIXSET_CID);
 NS_DEFINE_NAMED_CID(NS_URLCLASSIFIERDBSERVICE_CID);
 NS_DEFINE_NAMED_CID(NS_URLCLASSIFIERSTREAMUPDATER_CID);
 NS_DEFINE_NAMED_CID(NS_URLCLASSIFIERUTILS_CID);
 NS_DEFINE_NAMED_CID(NS_BROWSERSTATUSFILTER_CID);
 #if defined(MOZ_UPDATER) && !defined(MOZ_WIDGET_ANDROID)
 NS_DEFINE_NAMED_CID(NS_UPDATEPROCESSOR_CID);
 #endif
@@ -176,16 +180,17 @@ static const Module::CIDEntry kToolkitCI
 #if !defined(MOZ_DISABLE_PARENTAL_CONTROLS)
   { &kNS_PARENTALCONTROLSSERVICE_CID, false, nullptr, nsParentalControlsServiceConstructor },
 #endif
   { &kNS_DOWNLOADMANAGER_CID, false, nullptr, nsDownloadManagerConstructor },
   { &kNS_DOWNLOADPLATFORM_CID, false, nullptr, DownloadPlatformConstructor },
   { &kNS_FIND_SERVICE_CID, false, nullptr, nsFindServiceConstructor },
   { &kNS_TYPEAHEADFIND_CID, false, nullptr, nsTypeAheadFindConstructor },
   { &kNS_APPLICATION_REPUTATION_SERVICE_CID, false, nullptr, ApplicationReputationServiceConstructor },
+  { &kNS_LOGIN_REPUTATION_SERVICE_CID, false, nullptr, LoginReputationServiceConstructor },
   { &kNS_URLCLASSIFIERPREFIXSET_CID, false, nullptr, nsUrlClassifierPrefixSetConstructor },
   { &kNS_URLCLASSIFIERDBSERVICE_CID, false, nullptr, nsUrlClassifierDBServiceConstructor },
   { &kNS_URLCLASSIFIERSTREAMUPDATER_CID, false, nullptr, nsUrlClassifierStreamUpdaterConstructor },
   { &kNS_URLCLASSIFIERUTILS_CID, false, nullptr, nsUrlClassifierUtilsConstructor },
   { &kNS_BROWSERSTATUSFILTER_CID, false, nullptr, nsBrowserStatusFilterConstructor },
 #if defined(MOZ_UPDATER) && !defined(MOZ_WIDGET_ANDROID)
   { &kNS_UPDATEPROCESSOR_CID, false, nullptr, nsUpdateProcessorConstructor },
 #endif
@@ -213,16 +218,17 @@ static const Module::ContractIDEntry kTo
 #if !defined(MOZ_DISABLE_PARENTAL_CONTROLS)
   { NS_PARENTALCONTROLSSERVICE_CONTRACTID, &kNS_PARENTALCONTROLSSERVICE_CID },
 #endif
   { NS_DOWNLOADMANAGER_CONTRACTID, &kNS_DOWNLOADMANAGER_CID },
   { NS_DOWNLOADPLATFORM_CONTRACTID, &kNS_DOWNLOADPLATFORM_CID },
   { NS_FIND_SERVICE_CONTRACTID, &kNS_FIND_SERVICE_CID },
   { NS_TYPEAHEADFIND_CONTRACTID, &kNS_TYPEAHEADFIND_CID },
   { NS_APPLICATION_REPUTATION_SERVICE_CONTRACTID, &kNS_APPLICATION_REPUTATION_SERVICE_CID },
+  { NS_LOGIN_REPUTATION_SERVICE_CONTRACTID, &kNS_LOGIN_REPUTATION_SERVICE_CID },
   { NS_URLCLASSIFIERPREFIXSET_CONTRACTID, &kNS_URLCLASSIFIERPREFIXSET_CID },
   { NS_URLCLASSIFIERDBSERVICE_CONTRACTID, &kNS_URLCLASSIFIERDBSERVICE_CID },
   { NS_URICLASSIFIERSERVICE_CONTRACTID, &kNS_URLCLASSIFIERDBSERVICE_CID },
   { NS_URLCLASSIFIERSTREAMUPDATER_CONTRACTID, &kNS_URLCLASSIFIERSTREAMUPDATER_CID },
   { NS_URLCLASSIFIERUTILS_CONTRACTID, &kNS_URLCLASSIFIERUTILS_CID },
   { NS_BROWSERSTATUSFILTER_CONTRACTID, &kNS_BROWSERSTATUSFILTER_CID },
 #if defined(MOZ_UPDATER) && !defined(MOZ_WIDGET_ANDROID)
   { NS_UPDATEPROCESSOR_CONTRACTID, &kNS_UPDATEPROCESSOR_CID },

new file mode 100644
--- /dev/null
+++ b/toolkit/components/reputationservice/ILoginReputation.idl
@@ -0,0 +1,17 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+[scriptable, uuid(b527be1e-8fbb-41d9-bee4-267a71236368)]
+interface ILoginReputationQueryCallback : nsISupports {
+  void onQueryComplete();
+};
+
+[scriptable, uuid(1b3f1dfe-ce3a-486b-953e-ce5ac863eff9)]
+interface ILoginReputationService : nsISupports {
+  // XXX : Add QueryReputation interface
+};

new file mode 100644
--- /dev/null
+++ b/toolkit/components/reputationservice/LoginReputation.cpp
@@ -0,0 +1,38 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "LoginReputation.h"
+
+using namespace mozilla;
+
+// MOZ_LOG=LoginReputation:5
+LazyLogModule LoginReputationService::prlog("LoginReputation");
+#define LR_LOG(args) MOZ_LOG(LoginReputationService::prlog, mozilla::LogLevel::Debug, args)
+#define LR_LOG_ENABLED() MOZ_LOG_TEST(LoginReputationService::prlog, mozilla::LogLevel::Debug)
+
+NS_IMPL_ISUPPORTS(LoginReputationService,
+                  ILoginReputationService)
+
+LoginReputationService*
+  LoginReputationService::gLoginReputationService = nullptr;
+
+already_AddRefed<LoginReputationService>
+LoginReputationService::GetSingleton()
+{
+  if (!gLoginReputationService) {
+    gLoginReputationService = new LoginReputationService();
+  }
+  return do_AddRef(gLoginReputationService);
+}
+
+LoginReputationService::LoginReputationService()
+{
+  LR_LOG(("Login reputation service starting up"));
+}
+
+LoginReputationService::~LoginReputationService()
+{
+  LR_LOG(("Login reputation service shutting down"));
+}

new file mode 100644
--- /dev/null
+++ b/toolkit/components/reputationservice/LoginReputation.h
@@ -0,0 +1,36 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef LoginReputation_h__
+#define LoginReputation_h__
+
+#include "ILoginReputation.h"
+#include "mozilla/Logging.h"
+
+class LoginReputationService final : public ILoginReputationService
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_ILOGINREPUTATIONSERVICE
+
+public:
+  static already_AddRefed<LoginReputationService> GetSingleton();
+
+private:
+  /**
+   * Global singleton object for holding this factory service.
+   */
+  static LoginReputationService* gLoginReputationService;
+
+  /**
+   * MOZ_LOG=LoginReputation:5
+   */
+  static mozilla::LazyLogModule prlog;
+
+  LoginReputationService();
+  ~LoginReputationService();
+};
+
+#endif  // LoginReputation_h__

--- a/toolkit/components/reputationservice/moz.build
+++ b/toolkit/components/reputationservice/moz.build
@@ -5,24 +5,26 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 with Files('*'):
     BUG_COMPONENT = ('Toolkit', 'Safe Browsing')
 
 XPCSHELL_TESTS_MANIFESTS += ['test/unit/xpcshell.ini']
 
 XPIDL_SOURCES += [
+    'ILoginReputation.idl',
     'nsIApplicationReputation.idl',
 ]
 
 XPIDL_MODULE = 'reputationservice'
 
 UNIFIED_SOURCES += [
     'ApplicationReputation.cpp',
     'chromium/chrome/common/safe_browsing/csd.pb.cc',
+    'LoginReputation.cpp',
 ]
 
 FINAL_LIBRARY = 'xul'
 
 LOCAL_INCLUDES += [
     '../protobuf',
     '/ipc/chromium/src',
     'chromium',