diff --git a/dom/base/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index 3a3049bfe34..21cafa56c82 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -457,8 +457,6 @@ nsGlobalWindow::DOMMinTimeoutValue() const {
 // CIDs
 static NS_DEFINE_CID(kXULControllersCID, NS_XULCONTROLLERS_CID);
 
-static const char sPopStatePrefStr[] = "browser.history.allowPopState";
-
 #define NETWORK_UPLOAD_EVENT_NAME     NS_LITERAL_STRING("moznetworkupload")
 #define NETWORK_DOWNLOAD_EVENT_NAME   NS_LITERAL_STRING("moznetworkdownload")
 
@@ -9917,11 +9915,6 @@ nsGlobalWindow::DispatchSyncPopState()
   NS_ASSERTION(nsContentUtils::IsSafeToRunScript(),
                "Must be safe to run script here.");
 
-  // Check that PopState hasn't been pref'ed off.
-  if (!Preferences::GetBool(sPopStatePrefStr, false)) {
-    return NS_OK;
-  }
-
   nsresult rv = NS_OK;
 
   // Bail if the window is frozen.
diff --git a/dom/base/nsHistory.cpp b/dom/base/nsHistory.cpp
index a320743429d..3459df4b0cc 100644
--- a/dom/base/nsHistory.cpp
+++ b/dom/base/nsHistory.cpp
@@ -25,11 +25,6 @@
 using namespace mozilla;
 using namespace mozilla::dom;
 
-static const char* sAllowPushStatePrefStr =
-  "browser.history.allowPushState";
-static const char* sAllowReplaceStatePrefStr =
-  "browser.history.allowReplaceState";
-
 //
 //  History class implementation
 //
@@ -304,12 +299,6 @@ nsHistory::PushOrReplaceState(JSContext* aCx, JS::Handle<JS::Value> aData,
     return;
   }
 
-  // Check that PushState hasn't been pref'ed off.
-  if (!Preferences::GetBool(aReplace ? sAllowReplaceStatePrefStr :
-                            sAllowPushStatePrefStr, false)) {
-    return;
-  }
-
   // AddState might run scripts, so we need to hold a strong reference to the
   // docShell here to keep it from going away.
   nsCOMPtr<nsIDocShell> docShell = win->GetDocShell();
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 391c79b5977..b765cb10dbc 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -4486,9 +4486,6 @@ pref("html5.flushtimer.initialdelay", 120);
 pref("html5.flushtimer.subsequentdelay", 120);
 
 // Push/Pop/Replace State prefs
-pref("browser.history.allowPushState", true);
-pref("browser.history.allowReplaceState", true);
-pref("browser.history.allowPopState", true);
 pref("browser.history.maxStateObjectSize", 655360);
 
 pref("browser.meta_refresh_when_inactive.disabled", false);