--- a/netwerk/protocol/about/nsAboutProtocolHandler.cpp
+++ b/netwerk/protocol/about/nsAboutProtocolHandler.cpp
@@ -180,17 +180,22 @@ nsAboutProtocolHandler::NewChannel2(nsIU
     nsresult rv2 = NS_GetAboutModuleName(uri, path);
     if (NS_SUCCEEDED(rv2)) {
         if (path.EqualsLiteral("srcdoc")) {
             // about:srcdoc is meant to be unresolvable, yet is included in the
             // about lookup tables so that it can pass security checks when used in
             // a srcdoc iframe.  To ensure that it stays unresolvable, we pretend
             // that it doesn't exist.
             rv = NS_ERROR_FACTORY_NOT_REGISTERED;
-        } else {
+        } else if (!path.EqualsLiteral("blank") &&
+                   !path.EqualsLiteral("neterror") &&
+                   !path.EqualsLiteral("home") &&
+                   !path.EqualsLiteral("welcome") &&
+                   !path.EqualsLiteral("newtab") &&
+                   !path.EqualsLiteral("certerror")) {
             nsCOMPtr<nsIEnterprisePolicies> policyManager =
                 do_GetService("@mozilla.org/browser/enterprisepolicies;1", &rv2);
             if (NS_SUCCEEDED(rv2)) {
                 nsAutoCString normalizedURL;
                 normalizedURL.AssignLiteral("about:");
                 normalizedURL.Append(path);
                 rv2 = policyManager->IsAllowed(normalizedURL, &aboutPageAllowed);
                 if (NS_FAILED(rv2)) {

--- a/toolkit/xre/nsXREDirProvider.cpp
+++ b/toolkit/xre/nsXREDirProvider.cpp
@@ -973,20 +973,23 @@ nsXREDirProvider::DoStartup()
         appStartup->RestartInSafeMode(nsIAppStartup::eForceQuit);
         return NS_OK;
       }
     }
 
     static const char16_t kStartup[] = {'s','t','a','r','t','u','p','\0'};
     obsSvc->NotifyObservers(nullptr, "profile-do-change", kStartup);
 
-    // Initialize the Enterprise Policies service
-    nsCOMPtr<nsIObserver> policies(do_GetService("@mozilla.org/browser/enterprisepolicies;1"));
-    if (policies) {
-      policies->Observe(nullptr, "policies-startup", nullptr);
+    // Initialize the Enterprise Policies service in the parent process
+    // In the content process it's loaded on demand when needed
+    if (XRE_IsParentProcess()) {
+      nsCOMPtr<nsIObserver> policies(do_GetService("@mozilla.org/browser/enterprisepolicies;1"));
+      if (policies) {
+        policies->Observe(nullptr, "policies-startup", nullptr);
+      }
     }
 
     // Init the Extension Manager
     nsCOMPtr<nsIObserver> em = do_GetService("@mozilla.org/addons/integration;1");
     if (em) {
       em->Observe(nullptr, "addons-startup", nullptr);
     } else {
       NS_WARNING("Failed to create Addons Manager.");