--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -310,17 +310,18 @@ Object.defineProperty(this, "AddonManage
 
 
 var gInitialPages = [
   "about:blank",
   "about:newtab",
   "about:home",
   "about:privatebrowsing",
   "about:welcomeback",
-  "about:sessionrestore"
+  "about:sessionrestore",
+  "about:welcome"
 ];
 
 function isInitialPage(url) {
   return gInitialPages.includes(url) || url == BROWSER_NEW_TAB_URL;
 }
 
 function* browserWindows() {
   let windows = Services.wm.getEnumerator("navigator:browser");

--- a/browser/components/about/AboutRedirector.cpp
+++ b/browser/components/about/AboutRedirector.cpp
@@ -88,16 +88,20 @@ static const RedirEntry kRedirMap[] = {
   { "library", "chrome://browser/content/aboutLibrary.xhtml",
     nsIAboutModule::URI_MUST_LOAD_IN_CHILD |
     nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT },
   { "newtab", "about:blank",
     nsIAboutModule::ENABLE_INDEXED_DB |
     nsIAboutModule::URI_MUST_LOAD_IN_CHILD |
     nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT |
     nsIAboutModule::ALLOW_SCRIPT },
+  { "welcome", "about:blank",
+    nsIAboutModule::URI_MUST_LOAD_IN_CHILD |
+    nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT |
+    nsIAboutModule::ALLOW_SCRIPT },
   { "preferences", "chrome://browser/content/preferences/in-content/preferences.xul",
     nsIAboutModule::ALLOW_SCRIPT },
   { "downloads", "chrome://browser/content/downloads/contentAreaDownloadsView.xul",
     nsIAboutModule::ALLOW_SCRIPT },
   { "reader", "chrome://global/content/reader/aboutReader.html",
     nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT |
     nsIAboutModule::ALLOW_SCRIPT |
     nsIAboutModule::URI_MUST_LOAD_IN_CHILD |
@@ -147,17 +151,18 @@ AboutRedirector::NewChannel(nsIURI* aURI
 
   for (auto & redir : kRedirMap) {
     if (!strcmp(path.get(), redir.id)) {
       nsAutoCString url;
 
       // Let the aboutNewTabService decide where to redirect for about:home and
       // enabled about:newtab. Disabled about:newtab page uses fallback.
       if (path.EqualsLiteral("home") ||
-          (sNewTabPageEnabled && path.EqualsLiteral("newtab"))) {
+          (sNewTabPageEnabled && path.EqualsLiteral("newtab")) ||
+          path.EqualsLiteral("welcome")) {
         nsCOMPtr<nsIAboutNewTabService> aboutNewTabService =
           do_GetService("@mozilla.org/browser/aboutnewtab-service;1", &rv);
         NS_ENSURE_SUCCESS(rv, rv);
         rv = aboutNewTabService->GetDefaultURL(url);
         NS_ENSURE_SUCCESS(rv, rv);
       }
       // fall back to the specified url in the map
       if (url.IsEmpty()) {

--- a/browser/components/build/nsModule.cpp
+++ b/browser/components/build/nsModule.cpp
@@ -102,16 +102,17 @@ static const mozilla::Module::ContractID
     { NS_ABOUT_MODULE_CONTRACTID_PREFIX "sessionrestore", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
     { NS_ABOUT_MODULE_CONTRACTID_PREFIX "welcomeback", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
     { NS_ABOUT_MODULE_CONTRACTID_PREFIX "home", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
     { NS_ABOUT_MODULE_CONTRACTID_PREFIX "newtab", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
     { NS_ABOUT_MODULE_CONTRACTID_PREFIX "library", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
     { NS_ABOUT_MODULE_CONTRACTID_PREFIX "preferences", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
     { NS_ABOUT_MODULE_CONTRACTID_PREFIX "downloads", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
     { NS_ABOUT_MODULE_CONTRACTID_PREFIX "reader", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
+    { NS_ABOUT_MODULE_CONTRACTID_PREFIX "welcome", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
 #if defined(XP_WIN)
     { NS_IEHISTORYENUMERATOR_CONTRACTID, &kNS_WINIEHISTORYENUMERATOR_CID },
 #elif defined(XP_MACOSX)
     { NS_SHELLSERVICE_CONTRACTID, &kNS_SHELLSERVICE_CID },
 #endif
     { nullptr }
 };
 

--- a/browser/modules/AboutNewTab.jsm
+++ b/browser/modules/AboutNewTab.jsm
@@ -21,17 +21,17 @@ var AboutNewTab = {
   pageListener: null,
 
   isOverridden: false,
 
   init(pageListener) {
     if (this.isOverridden) {
       return;
     }
-    this.pageListener = pageListener || new RemotePages(["about:home", "about:newtab"]);
+    this.pageListener = pageListener || new RemotePages(["about:home", "about:newtab", "about:welcome"]);
     this.pageListener.addMessageListener("NewTab:Customize", this.customize);
     this.pageListener.addMessageListener("NewTab:MaybeShowMigrateMessage",
       this.maybeShowMigrateMessage);
   },
 
   maybeShowMigrateMessage({ target }) {
     AutoMigrate.shouldShowMigratePrompt(target.browser).then((prompt) => {
       if (prompt) {