diff --git a/browser/base/content/browser-doctype.inc b/browser/base/content/browser-doctype.inc
index 10015d898c..ad08f4b034 100644
--- a/browser/base/content/browser-doctype.inc
+++ b/browser/base/content/browser-doctype.inc
@@ -13,8 +13,10 @@
   %customizeToolbarDTD;
 <!ENTITY % placesDTD SYSTEM "chrome://browser/locale/places/places.dtd">
 %placesDTD;
+#ifdef MOZ_SAFE_BROWSING
 <!ENTITY % safebrowsingDTD SYSTEM "chrome://browser/locale/safebrowsing/phishing-afterload-warning-message.dtd">
 %safebrowsingDTD;
+#endif
 <!ENTITY % aboutHomeDTD SYSTEM "chrome://browser/locale/aboutHome.dtd">
 %aboutHomeDTD;
 <!ENTITY % syncBrandDTD SYSTEM "chrome://browser/locale/syncBrand.dtd">
diff --git a/browser/base/content/browser-safebrowsing.js b/browser/base/content/browser-safebrowsing.js
index 430d84f132..a66595b2d2 100644
--- a/browser/base/content/browser-safebrowsing.js
+++ b/browser/base/content/browser-safebrowsing.js
@@ -2,6 +2,7 @@
  * 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/. */
 
+#ifdef MOZ_SAFE_BROWSING
 var gSafeBrowsing = {
 
   setReportPhishingMenu: function() {
@@ -46,3 +47,4 @@ var gSafeBrowsing = {
     return SafeBrowsing.getReportURL(name, gBrowser.currentURI);
   }
 }
+#endif
diff --git a/browser/base/content/browser.js b/browser/base/content/browser.js
index 6b0b8d15b0..7f5adcb25c 100644
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -60,8 +60,10 @@ Cu.import("resource://gre/modules/NotificationDB.jsm");
   ["webrtcUI", "resource:///modules/webrtcUI.jsm", ]
 ].forEach(([name, resource]) => XPCOMUtils.defineLazyModuleGetter(this, name, resource));
 
-XPCOMUtils.defineLazyModuleGetter(this, "SafeBrowsing",
-  "resource://gre/modules/SafeBrowsing.jsm");
+#ifdef MOZ_SAFE_BROWSING
+  XPCOMUtils.defineLazyModuleGetter(this, "SafeBrowsing",
+    "resource://gre/modules/SafeBrowsing.jsm");
+#endif
 
 // lazy service getters
 [
@@ -1205,8 +1207,10 @@ var gBrowserInit = {
       }
     }
 
+#ifdef MOZ_SAFE_BROWSING
     // Bug 778855 - Perf regression if we do this here. To be addressed in bug 779008.
     setTimeout(function() { SafeBrowsing.init(); }, 2000);
+#endif
 
     Services.obs.addObserver(gIdentityHandler, "perm-changed", false);
     Services.obs.addObserver(gSessionHistoryObserver, "browser:purge-session-history", false);
diff --git a/browser/base/content/global-scripts.inc b/browser/base/content/global-scripts.inc
index dac75878da..ca942cec88 100644
--- a/browser/base/content/global-scripts.inc
+++ b/browser/base/content/global-scripts.inc
@@ -23,7 +23,9 @@
 <script type="application/javascript" src="chrome://browser/content/browser-places.js"/>
 <script type="application/javascript" src="chrome://browser/content/browser-plugins.js"/>
 <script type="application/javascript" src="chrome://browser/content/browser-refreshblocker.js"/>
+#ifdef MOZ_SAFE_BROWSING
 <script type="application/javascript" src="chrome://browser/content/browser-safebrowsing.js"/>
+#endif
 <script type="application/javascript" src="chrome://browser/content/browser-sidebar.js"/>
 <script type="application/javascript" src="chrome://browser/content/browser-social.js"/>
 <script type="application/javascript" src="chrome://browser/content/browser-syncui.js"/>
diff --git a/browser/base/content/utilityOverlay.js b/browser/base/content/utilityOverlay.js
index b041915a7c..4ea6d8f900 100644
--- a/browser/base/content/utilityOverlay.js
+++ b/browser/base/content/utilityOverlay.js
@@ -819,9 +819,8 @@ function openTourPage()
 function buildHelpMenu()
 {
   // Enable/disable the "Report Web Forgery" menu item.
-  if (typeof gSafeBrowsing != "undefined") {
+  if (typeof gSafeBrowsing != "undefined")
     gSafeBrowsing.setReportPhishingMenu();
-  }
 }
 
 function isElementVisible(aElement)
diff --git a/browser/base/jar.mn b/browser/base/jar.mn
index 29286d0d80..350431bef7 100644
--- a/browser/base/jar.mn
+++ b/browser/base/jar.mn
@@ -87,7 +87,9 @@ browser.jar:
         content/browser/browser-places.js             (content/browser-places.js)
         content/browser/browser-plugins.js            (content/browser-plugins.js)
         content/browser/browser-refreshblocker.js     (content/browser-refreshblocker.js)
+#ifdef MOZ_SAFE_BROWSING
         content/browser/browser-safebrowsing.js       (content/browser-safebrowsing.js)
+#endif
         content/browser/browser-sidebar.js            (content/browser-sidebar.js)
         content/browser/browser-social.js             (content/browser-social.js)
 *       content/browser/browser-syncui.js             (content/browser-syncui.js)
@@ -192,8 +194,10 @@ browser.jar:
 # the following files are browser-specific overrides
 *       content/browser/license.html                  (/toolkit/content/license.html)
 % override chrome://global/content/license.html chrome://browser/content/license.html
+#ifdef MOZ_SAFE_BROWSING
         content/browser/report-phishing-overlay.xul     (content/report-phishing-overlay.xul)
         content/browser/blockedSite.xhtml               (content/blockedSite.xhtml)
 % overlay chrome://browser/content/browser.xul chrome://browser/content/report-phishing-overlay.xul
+#endif
 
 % override chrome://global/content/netError.xhtml chrome://browser/content/aboutNetError.xhtml
diff --git a/browser/components/about/AboutRedirector.cpp b/browser/components/about/AboutRedirector.cpp
index 717ae9c48a..8ddf19510b 100644
--- a/browser/components/about/AboutRedirector.cpp
+++ b/browser/components/about/AboutRedirector.cpp
@@ -41,12 +41,14 @@ static RedirEntry kRedirMap[] = {
     nsIAboutModule::HIDE_FROM_ABOUTABOUT
   },
   {
+#ifdef MOZ_SAFE_BROWSING
     "blocked", "chrome://browser/content/blockedSite.xhtml",
     nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT |
     nsIAboutModule::URI_CAN_LOAD_IN_CHILD |
     nsIAboutModule::ALLOW_SCRIPT |
     nsIAboutModule::HIDE_FROM_ABOUTABOUT
   },
+#endif
   {
     "certerror", "chrome://browser/content/aboutNetError.xhtml",
     nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT |
diff --git a/browser/components/build/nsModule.cpp b/browser/components/build/nsModule.cpp
index 1fad0ce68d..967da3ebc1 100644
--- a/browser/components/build/nsModule.cpp
+++ b/browser/components/build/nsModule.cpp
@@ -86,7 +86,9 @@ static const mozilla::Module::ContractIDEntry kBrowserContracts[] = {
 #endif
     { NS_FEEDSNIFFER_CONTRACTID, &kNS_FEEDSNIFFER_CID },
     { NS_ABOUT_MODULE_CONTRACTID_PREFIX "basilisk", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
+#ifdef MOZ_SAFE_BROWSING
     { NS_ABOUT_MODULE_CONTRACTID_PREFIX "blocked", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
+#endif
     { NS_ABOUT_MODULE_CONTRACTID_PREFIX "certerror", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
     { NS_ABOUT_MODULE_CONTRACTID_PREFIX "socialerror", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
     { NS_ABOUT_MODULE_CONTRACTID_PREFIX "providerdirectory", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
diff --git a/browser/confvars.sh b/browser/confvars.sh
index 41c0be3d74..0343034a41 100644
--- a/browser/confvars.sh
+++ b/browser/confvars.sh
@@ -59,6 +59,7 @@ MOZ_DEVTOOLS=1
 MOZ_SERVICES_COMMON=1
 MOZ_SERVICES_SYNC=1
 MOZ_SERVICES_HEALTHREPORT=
+MOZ_SAFE_BROWSING=
 
 # Disable checking that add-ons are signed by the trusted root
 MOZ_ADDON_SIGNING=0
diff --git a/browser/installer/package-manifest.in b/browser/installer/package-manifest.in
index 9483968fb6..6a773e9fec 100644
--- a/browser/installer/package-manifest.in
+++ b/browser/installer/package-manifest.in
@@ -578,12 +578,14 @@
 @RESPATH@/browser/modules/*
 @RESPATH@/modules/*
 
+#ifdef MOZ_URL_CLASSIFIER
 ; Safe Browsing
 @RESPATH@/components/nsURLClassifier.manifest
 @RESPATH@/components/nsUrlClassifierHashCompleter.js
 @RESPATH@/components/nsUrlClassifierListManager.js
 @RESPATH@/components/nsUrlClassifierLib.js
 @RESPATH@/components/url-classifier.xpt
+#endif
 
 ; Private Browsing
 @RESPATH@/components/privatebrowsing.xpt
diff --git a/browser/locales/jar.mn b/browser/locales/jar.mn
index 6d76d20f0b..31cbd9ccff 100644
--- a/browser/locales/jar.mn
+++ b/browser/locales/jar.mn
@@ -53,8 +53,10 @@
     locale/browser/places/bookmarkProperties.properties (%chrome/browser/places/bookmarkProperties.properties)
     locale/browser/preferences/selectBookmark.dtd  (%chrome/browser/preferences/selectBookmark.dtd)
     locale/browser/places/moveBookmarks.dtd        (%chrome/browser/places/moveBookmarks.dtd)
+#ifdef MOZ_SAFE_BROWSING
     locale/browser/safebrowsing/phishing-afterload-warning-message.dtd (%chrome/browser/safebrowsing/phishing-afterload-warning-message.dtd)
     locale/browser/safebrowsing/report-phishing.dtd                    (%chrome/browser/safebrowsing/report-phishing.dtd)
+#endif
     locale/browser/feeds/subscribe.dtd              (%chrome/browser/feeds/subscribe.dtd)
     locale/browser/feeds/subscribe.properties       (%chrome/browser/feeds/subscribe.properties)
     locale/browser/migration/migration.dtd         (%chrome/browser/migration/migration.dtd)