--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -374,19 +374,16 @@ pref("browser.search.openintab", false);
 // context menu searches open in the foreground
 pref("browser.search.context.loadInBackground", false);
 
 // comma seperated list of of engines to hide in the search panel.
 pref("browser.search.hiddenOneOffs", "");
 
 pref("browser.search.reset.enabled", true);
 
-pref("browser.usedOnWindows10", false);
-pref("browser.usedOnWindows10.introURL", "https://www.mozilla.org/%LOCALE%/firefox/windows-10/welcome/?utm_source=firefox-browser&utm_medium=firefox-browser");
-
 pref("browser.sessionhistory.max_entries", 50);
 
 // Built-in default permissions.
 pref("permissions.manager.defaultsUrl", "resource://app/defaults/permissions");
 
 // handle links targeting new windows
 // 1=current window/tab, 2=new window, 3=new tab in most recent window
 pref("browser.link.open_newwindow", 3);

--- a/browser/components/migration/FirefoxProfileMigrator.js
+++ b/browser/components/migration/FirefoxProfileMigrator.js
@@ -152,21 +152,16 @@ FirefoxProfileMigrator.prototype._getRes
           let buildID = Services.appinfo.platformBuildID;
           let mstone = Services.appinfo.platformVersion;
           // Force the browser to one-off resume the session that we give it:
           Services.prefs.setBoolPref("browser.sessionstore.resume_session_once", true);
           // Reset the homepage_override prefs so that the browser doesn't override our
           // session with the "what's new" page:
           Services.prefs.setCharPref("browser.startup.homepage_override.mstone", mstone);
           Services.prefs.setCharPref("browser.startup.homepage_override.buildID", buildID);
-          // Also set the Windows 10 pref to avoid the win10 intro page to show up
-          // on startup.
-          if (AppConstants.isPlatformAndVersionAtLeast("win", "10")) {
-            Services.prefs.setBoolPref("browser.usedOnWindows10", true);
-          }
           // It's too early in startup for the pref service to have a profile directory,
           // so we have to manually tell it where to save the prefs file.
           let newPrefsFile = currentProfileDir.clone();
           newPrefsFile.append("prefs.js");
           Services.prefs.savePrefFile(newPrefsFile);
           aCallback(true);
         }, function() {
           aCallback(false);

--- a/browser/components/nsBrowserContentHandler.js
+++ b/browser/components/nsBrowserContentHandler.js
@@ -520,32 +520,16 @@ nsBrowserContentHandler.prototype = {
         }
       }
     } catch (ex) {}
 
     // formatURLPref might return "about:blank" if getting the pref fails
     if (overridePage == "about:blank")
       overridePage = "";
 
-    // Temporary override page for users who are running Firefox on Windows 10 for their first time.
-    let platformVersion = Services.sysinfo.getProperty("version");
-    if (AppConstants.platform == "win" &&
-        Services.vc.compare(platformVersion, "10") == 0 &&
-        !Services.prefs.getBoolPref("browser.usedOnWindows10")) {
-      Services.prefs.setBoolPref("browser.usedOnWindows10", true);
-      let firstUseOnWindows10URL = Services.urlFormatter.formatURLPref("browser.usedOnWindows10.introURL");
-
-      if (firstUseOnWindows10URL && firstUseOnWindows10URL.length) {
-        additionalPage = firstUseOnWindows10URL;
-        if (override == OVERRIDE_NEW_PROFILE) {
-          additionalPage += "&utm_content=firstrun";
-        }
-      }
-    }
-
     if (!additionalPage) {
       additionalPage = LaterRun.getURL() || "";
     }
 
     if (additionalPage && additionalPage != "about:blank") {
       if (overridePage) {
         overridePage += "|" + additionalPage;
       } else {

--- a/layout/tools/reftest/reftest-preferences.js
+++ b/layout/tools/reftest/reftest-preferences.js
@@ -102,17 +102,16 @@ user_pref("xpinstall.signatures.required
 
 // Don't use auto-enabled e10s
 user_pref("browser.tabs.remote.autostart.1", false);
 user_pref("browser.tabs.remote.autostart.2", false);
 
 user_pref("startup.homepage_welcome_url", "");
 user_pref("startup.homepage_welcome_url.additional", "");
 user_pref("startup.homepage_override_url", "");
-user_pref("browser.usedOnWindows10.introURL", "");
 
 user_pref("media.gmp-manager.url.override", "http://localhost/dummy-gmp-manager.xml");
 
 // A fake bool pref for "@supports -moz-bool-pref" sanify test.
 user_pref("testing.supports.moz-bool-pref", true);
 
 // Reftests load a lot of URLs very quickly. This puts avoidable and
 // unnecessary I/O pressure on the Places DB (measured to be in the

--- a/testing/marionette/client/marionette_driver/geckoinstance.py
+++ b/testing/marionette/client/marionette_driver/geckoinstance.py
@@ -309,17 +309,16 @@ class DesktopInstance(GeckoInstance):
         'browser.safebrowsing.forbiddenURIs.enabled': False,
         'browser.safebrowsing.malware.enabled': False,
         'browser.safebrowsing.phishing.enabled': False,
         'browser.search.update': False,
         'browser.tabs.animate': False,
         'browser.tabs.warnOnClose': False,
         'browser.tabs.warnOnOpen': False,
         'browser.uitour.enabled': False,
-        'browser.usedOnWindows10.introURL': '',
         'extensions.getAddons.cache.enabled': False,
         'extensions.installDistroAddons': False,
         'extensions.showMismatchUI': False,
         'extensions.update.enabled': False,
         'extensions.update.notifyUser': False,
         'geo.provider.testing': True,
         'javascript.options.showInConsole': True,
         'privacy.trackingprotection.enabled': False,

--- a/testing/profiles/prefs_general.js
+++ b/testing/profiles/prefs_general.js
@@ -346,9 +346,8 @@ user_pref("browser.urlbar.suggest.search
 // tests that don't expect it to be there.
 user_pref("browser.urlbar.userMadeSearchSuggestionsChoice", true);
 
 user_pref("dom.audiochannel.mutedByDefault", false);
 
 user_pref("webextensions.tests", true);
 user_pref("startup.homepage_welcome_url", "about:blank");
 user_pref("startup.homepage_welcome_url.additional", "");
-user_pref("browser.usedOnWindows10.introURL", "");