--- a/accessible/base/nsAccessibilityService.h
+++ b/accessible/base/nsAccessibilityService.h
@@ -19,16 +19,21 @@
 
 class nsImageFrame;
 class nsIArray;
 class nsIPersistentProperties;
 class nsPluginFrame;
 class nsITreeView;
 
 namespace mozilla {
+
+namespace dom {
+  class ContentChild;
+}
+
 namespace a11y {
 
 class ApplicationAccessible;
 class xpcAccessibleApplication;
 
 /**
  * Return focus manager.
  */
@@ -290,16 +295,17 @@ private:
 
   friend nsAccessibilityService* GetAccService();
   friend nsAccessibilityService* GetOrCreateAccService(bool);
   friend bool CanShutdownAccService();
   friend mozilla::a11y::FocusManager* mozilla::a11y::FocusMgr();
   friend mozilla::a11y::SelectionManager* mozilla::a11y::SelectionMgr();
   friend mozilla::a11y::ApplicationAccessible* mozilla::a11y::ApplicationAcc();
   friend mozilla::a11y::xpcAccessibleApplication* mozilla::a11y::XPCApplicationAcc();
+  friend class mozilla::dom::ContentChild;
   friend class xpcAccessibilityService;
 };
 
 /**
  * Return the accessibility service instance. (Handy global function)
  */
 inline nsAccessibilityService*
 GetAccService()

--- a/dom/ipc/ContentChild.cpp
+++ b/dom/ipc/ContentChild.cpp
@@ -2459,22 +2459,35 @@ ContentChild::RecvFlushMemory(const nsSt
     mozilla::services::GetObserverService();
   if (os) {
     os->NotifyObservers(nullptr, "memory-pressure", reason.get());
   }
   return true;
 }
 
 bool
-ContentChild::RecvActivateA11y()
+ContentChild::RecvActivateA11y(const bool& aIsPlatformCaller)
 {
 #ifdef ACCESSIBILITY
   // Start accessibility in content process if it's running in chrome
   // process.
-  GetOrCreateAccService();
+  GetOrCreateAccService(aIsPlatformCaller);
+#endif
+  return true;
+}
+
+bool
+ContentChild::RecvShutdownA11y()
+{
+#ifdef ACCESSIBILITY
+  // Shutdown accessibility in content process if it's shutting down in chrome
+  // process.
+  if (CanShutdownAccService()) {
+    GetAccService()->Shutdown();
+  }
 #endif
   return true;
 }
 
 bool
 ContentChild::RecvGarbageCollect()
 {
   // Rebroadcast the "child-gc-request" so that workers will GC.

--- a/dom/ipc/ContentChild.h
+++ b/dom/ipc/ContentChild.h
@@ -435,17 +435,19 @@ public:
   virtual bool RecvGeolocationError(const uint16_t& errorCode) override;
 
   virtual bool RecvUpdateDictionaryList(InfallibleTArray<nsString>&& aDictionaries) override;
 
   virtual bool RecvAddPermission(const IPC::Permission& permission) override;
 
   virtual bool RecvFlushMemory(const nsString& reason) override;
 
-  virtual bool RecvActivateA11y() override;
+  virtual bool RecvActivateA11y(const bool& aIsPlatformCaller) override;
+
+  virtual bool RecvShutdownA11y() override;
 
   virtual bool RecvGarbageCollect() override;
   virtual bool RecvCycleCollect() override;
 
   virtual bool RecvAppInfo(const nsCString& version, const nsCString& buildID,
                            const nsCString& name, const nsCString& UAName,
                            const nsCString& ID, const nsCString& vendor) override;
 

--- a/dom/ipc/ContentParent.cpp
+++ b/dom/ipc/ContentParent.cpp
@@ -270,16 +270,20 @@ using namespace mozilla::system;
 #ifdef XP_WIN
 #include "mozilla/widget/AudioSession.h"
 #endif
 
 #ifdef MOZ_CRASHREPORTER
 #include "nsThread.h"
 #endif
 
+#ifdef ACCESSIBILITY
+#include "nsAccessibilityService.h"
+#endif
+
 // For VP9Benchmark::sBenchmarkFpsPref
 #include "Benchmark.h"
 
 static NS_DEFINE_CID(kCClipboardCID, NS_CLIPBOARD_CID);
 
 #if defined(XP_WIN)
 // e10s forced enable pref, defined in nsAppRunner.cpp
 extern const char* kForceEnableE10sPref;
@@ -1373,22 +1377,22 @@ ContentParent::Init()
     obs->NotifyObservers(static_cast<nsIObserver*>(this), "ipc:content-created", cpId.get());
   }
 
 #ifdef ACCESSIBILITY
   // If accessibility is running in chrome process then start it in content
   // process.
   if (nsIPresShell::IsAccessibilityActive()) {
 #if !defined(XP_WIN)
-    Unused << SendActivateA11y();
+    Unused << SendActivateA11y(nsAccessibilityService::IsPlatformCaller());
 #else
     // On Windows we currently only enable a11y in the content process
     // for testing purposes.
     if (Preferences::GetBool(kForceEnableE10sPref, false)) {
-      Unused << SendActivateA11y();
+      Unused << SendActivateA11y(nsAccessibilityService::IsPlatformCaller());
     }
 #endif
   }
 #endif
 
 #ifdef MOZ_ENABLE_PROFILER_SPS
   nsCOMPtr<nsIProfiler> profiler(do_GetService("@mozilla.org/tools/profiler;1"));
   bool profilerActive = false;
@@ -2868,29 +2872,34 @@ ContentParent::Observe(nsISupports* aSub
     Unused << SendNotifyPhoneStateChange(state);
   }
   else if(!strcmp(aTopic, NS_VOLUME_REMOVED)) {
     nsString volName(aData);
     Unused << SendVolumeRemoved(volName);
   }
 #endif
 #ifdef ACCESSIBILITY
-  // Make sure accessibility is running in content process when accessibility
-  // gets initiated in chrome process.
-  else if (aData && (*aData == '1') &&
-       !strcmp(aTopic, "a11y-init-or-shutdown")) {
+  else if (aData && !strcmp(aTopic, "a11y-init-or-shutdown")) {
+    if (*aData == '1') {
+      // Make sure accessibility is running in content process when
+      // accessibility gets initiated in chrome process.
 #if !defined(XP_WIN)
-    Unused << SendActivateA11y();
+      Unused << SendActivateA11y(nsAccessibilityService::IsPlatformCaller());
 #else
-    // On Windows we currently only enable a11y in the content process
-    // for testing purposes.
-    if (Preferences::GetBool(kForceEnableE10sPref, false)) {
-      Unused << SendActivateA11y();
+      // On Windows we currently only enable a11y in the content process
+      // for testing purposes.
+      if (Preferences::GetBool(kForceEnableE10sPref, false)) {
+        Unused << SendActivateA11y(nsAccessibilityService::IsPlatformCaller());
+      }
+#endif
+    } else {
+      // If possible, shut down accessibility in content process when
+      // accessibility gets shutdown in chrome process.
+      Unused << SendShutdownA11y();
     }
-#endif
   }
 #endif
   else if (!strcmp(aTopic, "app-theme-changed")) {
     Unused << SendOnAppThemeChanged();
   }
 #ifdef MOZ_ENABLE_PROFILER_SPS
   else if (!strcmp(aTopic, "profiler-started")) {
     nsCOMPtr<nsIProfilerStartParams> params(do_QueryInterface(aSubject));

--- a/dom/ipc/PContent.ipdl
+++ b/dom/ipc/PContent.ipdl
@@ -541,17 +541,22 @@ child:
     async FlushMemory(nsString reason);
 
     async GarbageCollect();
     async CycleCollect();
 
     /**
      * Start accessibility engine in content process.
      */
-    async ActivateA11y();
+    async ActivateA11y(bool isPlatformCaller);
+
+    /**
+     * Shutdown accessibility engine in content process.
+     */
+    async ShutdownA11y();
 
     async AppInfo(nsCString version, nsCString buildID, nsCString name, nsCString UAName,
                   nsCString ID, nsCString vendor);
     async AppInit();
 
     /**
      * Send ServiceWorkerRegistrationData to child process.
      */