diff --git a/browser/components/nsBrowserGlue.js b/browser/components/nsBrowserGlue.js
index c880da574cb86..659a56ff806dc 100644
--- a/browser/components/nsBrowserGlue.js
+++ b/browser/components/nsBrowserGlue.js
@@ -1109,6 +1109,12 @@ BrowserGlue.prototype = {
     // 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) {
diff --git a/toolkit/components/build/nsToolkitCompsCID.h b/toolkit/components/build/nsToolkitCompsCID.h
index 9383e6856f8fe..6dd7e17ec90ab 100644
--- a/toolkit/components/build/nsToolkitCompsCID.h
+++ b/toolkit/components/build/nsToolkitCompsCID.h
@@ -181,6 +181,12 @@
 #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 } }
 
diff --git a/toolkit/components/build/nsToolkitCompsModule.cpp b/toolkit/components/build/nsToolkitCompsModule.cpp
index 675afc4a55901..cc28fc5d83d4d 100644
--- a/toolkit/components/build/nsToolkitCompsModule.cpp
+++ b/toolkit/components/build/nsToolkitCompsModule.cpp
@@ -26,6 +26,7 @@
 #include "nsTypeAheadFind.h"
 
 #include "ApplicationReputation.h"
+#include "LoginReputation.h"
 #include "nsUrlClassifierDBService.h"
 #include "nsUrlClassifierStreamUpdater.h"
 #include "nsUrlClassifierUtils.h"
@@ -91,6 +92,8 @@ 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)
@@ -146,6 +149,7 @@ 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);
@@ -181,6 +185,7 @@ static const Module::CIDEntry kToolkitCIDs[] = {
   { &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 },
@@ -218,6 +223,7 @@ static const Module::ContractIDEntry kToolkitContracts[] = {
   { 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 },
diff --git a/toolkit/components/reputationservice/ILoginReputation.idl b/toolkit/components/reputationservice/ILoginReputation.idl
new file mode 100644
index 0000000000000..ded4948d3e4b2
--- /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
+};
diff --git a/toolkit/components/reputationservice/LoginReputation.cpp b/toolkit/components/reputationservice/LoginReputation.cpp
new file mode 100644
index 0000000000000..163934502ef8f
--- /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"));
+}
diff --git a/toolkit/components/reputationservice/LoginReputation.h b/toolkit/components/reputationservice/LoginReputation.h
new file mode 100644
index 0000000000000..76a80139d7e51
--- /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__
diff --git a/toolkit/components/reputationservice/moz.build b/toolkit/components/reputationservice/moz.build
index 67f95849f26d6..c8dd45a47c2c1 100644
--- a/toolkit/components/reputationservice/moz.build
+++ b/toolkit/components/reputationservice/moz.build
@@ -10,6 +10,7 @@ with Files('*'):
 XPCSHELL_TESTS_MANIFESTS += ['test/unit/xpcshell.ini']
 
 XPIDL_SOURCES += [
+    'ILoginReputation.idl',
     'nsIApplicationReputation.idl',
 ]
 
@@ -18,6 +19,7 @@ XPIDL_MODULE = 'reputationservice'
 UNIFIED_SOURCES += [
     'ApplicationReputation.cpp',
     'chromium/chrome/common/safe_browsing/csd.pb.cc',
+    'LoginReputation.cpp',
 ]
 
 FINAL_LIBRARY = 'xul'