diff --git a/dom/ipc/ContentParent.cpp b/dom/ipc/ContentParent.cpp
index f7531f154099..f77509a34821 100644
--- a/dom/ipc/ContentParent.cpp
+++ b/dom/ipc/ContentParent.cpp
@@ -593,16 +593,16 @@ ProcessID GetTelemetryProcessID(const nsACString& remoteType) {
 
 }  // anonymous namespace
 
-UniquePtr<nsTHashMap<nsUint32HashKey, ContentParent*>>
+StaticAutoPtr<nsTHashMap<nsUint32HashKey, ContentParent*>>
     ContentParent::sJSPluginContentParents;
-UniquePtr<LinkedList<ContentParent>> ContentParent::sContentParents;
+StaticAutoPtr<LinkedList<ContentParent>> ContentParent::sContentParents;
 StaticRefPtr<ContentParent> ContentParent::sRecycledE10SProcess;
 #if defined(XP_LINUX) && defined(MOZ_SANDBOX)
-UniquePtr<SandboxBrokerPolicyFactory>
+StaticAutoPtr<SandboxBrokerPolicyFactory>
     ContentParent::sSandboxBrokerPolicyFactory;
 #endif
 #if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
-UniquePtr<std::vector<std::string>> ContentParent::sMacSandboxParams;
+StaticAutoPtr<std::vector<std::string>> ContentParent::sMacSandboxParams;
 #endif
 
 // Set to true when the first content process gets created.
@@ -675,11 +675,11 @@ void ContentParent::StartUp() {
                                        kFissionOmitBlockListValues);
 
 #if defined(XP_LINUX) && defined(MOZ_SANDBOX)
-  sSandboxBrokerPolicyFactory = MakeUnique<SandboxBrokerPolicyFactory>();
+  sSandboxBrokerPolicyFactory = new SandboxBrokerPolicyFactory();
 #endif
 
 #if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
-  sMacSandboxParams = MakeUnique<std::vector<std::string>>();
+  sMacSandboxParams = new std::vector<std::string>();
 #endif
 }
 
@@ -1180,8 +1180,7 @@ already_AddRefed<ContentParent> ContentParent::GetNewOrUsedJSPluginProcess(
   if (sJSPluginContentParents) {
     p = sJSPluginContentParents->Get(aPluginID);
   } else {
-    sJSPluginContentParents =
-        MakeUnique<nsTHashMap<nsUint32HashKey, ContentParent*>>();
+    sJSPluginContentParents = new nsTHashMap<nsUint32HashKey, ContentParent*>();
   }
 
   if (p) {
@@ -2837,7 +2836,7 @@ ContentParent::ContentParent(const nsACString& aRemoteType, int32_t aJSPluginID)
 
   // Insert ourselves into the global linked list of ContentParent objects.
   if (!sContentParents) {
-    sContentParents = MakeUnique<LinkedList<ContentParent>>();
+    sContentParents = new LinkedList<ContentParent>();
   }
   sContentParents->insertBack(this);
 
diff --git a/dom/ipc/ContentParent.h b/dom/ipc/ContentParent.h
index d99686e5d768..e1f75565e02b 100644
--- a/dom/ipc/ContentParent.h
+++ b/dom/ipc/ContentParent.h
@@ -28,6 +28,7 @@
 #include "mozilla/Maybe.h"
 #include "mozilla/MemoryReportingProcess.h"
 #include "mozilla/MozPromise.h"
+#include "mozilla/StaticPtr.h"
 #include "mozilla/TimeStamp.h"
 #include "mozilla/UniquePtr.h"
 
@@ -696,9 +697,9 @@ class ContentParent final : public PContentParent,
    */
   static nsClassHashtable<nsCStringHashKey, nsTArray<ContentParent*>>*
       sBrowserContentParents;
-  static UniquePtr<nsTHashMap<nsUint32HashKey, ContentParent*>>
+  static mozilla::StaticAutoPtr<nsTHashMap<nsUint32HashKey, ContentParent*>>
       sJSPluginContentParents;
-  static UniquePtr<LinkedList<ContentParent>> sContentParents;
+  static mozilla::StaticAutoPtr<LinkedList<ContentParent>> sContentParents;
 
   /**
    * In order to avoid rapidly creating and destroying content processes when
@@ -715,7 +716,7 @@ class ContentParent final : public PContentParent,
 
 #if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
   // Cached Mac sandbox params used when launching content processes.
-  static UniquePtr<std::vector<std::string>> sMacSandboxParams;
+  static mozilla::StaticAutoPtr<std::vector<std::string>> sMacSandboxParams;
 #endif
 
   // Set aLoadUri to true to load aURIToLoad and to false to only create the
@@ -1590,7 +1591,7 @@ class ContentParent final : public PContentParent,
 
 #if defined(XP_LINUX) && defined(MOZ_SANDBOX)
   mozilla::UniquePtr<SandboxBroker> mSandboxBroker;
-  static mozilla::UniquePtr<SandboxBrokerPolicyFactory>
+  static mozilla::StaticAutoPtr<SandboxBrokerPolicyFactory>
       sSandboxBrokerPolicyFactory;
 #endif