--- a/browser/base/content/tabbrowser.xml
+++ b/browser/base/content/tabbrowser.xml
@@ -1462,17 +1462,18 @@
 
             b.droppedLinkHandler = handleDroppedLink;
 
             // If we just created a new tab that loads the default
             // newtab url, swap in a preloaded page if possible.
             // Do nothing if we're a private window.
             let docShellsSwapped = false;
             if (aURI == BROWSER_NEW_TAB_URL &&
-                !PrivateBrowsingUtils.isWindowPrivate(window)) {
+                !PrivateBrowsingUtils.isWindowPrivate(window) &&
+                !gMultiProcessBrowser) {
               docShellsSwapped = gBrowserNewTabPreloader.newTab(t);
             }
 
             // Dispatch a new tab notification.  We do this once we're
             // entirely done, so that things are in a consistent state
             // even if the event listener opens or closes tabs.
             var evt = document.createEvent("Events");
             evt.initEvent("TabOpen", true, false);