--- a/widget/PuppetWidget.cpp
+++ b/widget/PuppetWidget.cpp
@@ -87,22 +87,17 @@ NS_IMPL_ISUPPORTS_INHERITED(PuppetWidget
 PuppetWidget::PuppetWidget(TabChild* aTabChild)
   : mTabChild(aTabChild)
   , mMemoryPressureObserver(nullptr)
   , mDPI(-1)
   , mRounding(-1)
   , mDefaultScale(-1)
   , mCursorHotspotX(0)
   , mCursorHotspotY(0)
-  , mNativeKeyCommandsValid(false)
 {
-  mSingleLineCommands.SetCapacity(4);
-  mMultiLineCommands.SetCapacity(4);
-  mRichTextCommands.SetCapacity(4);
-
   // Setting 'Unknown' means "not yet cached".
   mInputContext.mIMEState.mEnabled = IMEState::UNKNOWN;
 
   if (!gRemoteDesktopBehaviorInitialized) {
     Preferences::AddBoolVarCache(&gRemoteDesktopBehaviorEnabled, "browser.tabs.remote.desktopbehavior", false);
     gRemoteDesktopBehaviorInitialized = true;
   }
 }

--- a/widget/PuppetWidget.h
+++ b/widget/PuppetWidget.h
@@ -387,80 +387,29 @@ private:
   NativeIMEContext mNativeIMEContext;
   ContentCacheInChild mContentCache;
 
   // The DPI of the screen corresponding to this widget
   float mDPI;
   int32_t mRounding;
   double mDefaultScale;
 
-  // Precomputed answers for ExecuteNativeKeyBinding
-  InfallibleTArray<mozilla::CommandInt> mSingleLineCommands;
-  InfallibleTArray<mozilla::CommandInt> mMultiLineCommands;
-  InfallibleTArray<mozilla::CommandInt> mRichTextCommands;
-
   nsCOMPtr<imgIContainer> mCustomCursor;
   uint32_t mCursorHotspotX, mCursorHotspotY;
 
   nsCOMArray<nsIKeyEventInPluginCallback> mKeyEventInPluginCallbacks;
 
   RefPtr<TextEventDispatcherListener> mNativeTextEventDispatcherListener;
 
 protected:
   bool mEnabled;
   bool mVisible;
 
 private:
   bool mNeedIMEStateInit;
-  bool mNativeKeyCommandsValid;
-};
-
-struct AutoCacheNativeKeyCommands
-{
-  explicit AutoCacheNativeKeyCommands(PuppetWidget* aWidget)
-    : mWidget(aWidget)
-  {
-    mSavedValid = mWidget->mNativeKeyCommandsValid;
-    mSavedSingleLine = mWidget->mSingleLineCommands;
-    mSavedMultiLine = mWidget->mMultiLineCommands;
-    mSavedRichText = mWidget->mRichTextCommands;
-  }
-
-  void Cache(const InfallibleTArray<mozilla::CommandInt>& aSingleLineCommands,
-             const InfallibleTArray<mozilla::CommandInt>& aMultiLineCommands,
-             const InfallibleTArray<mozilla::CommandInt>& aRichTextCommands)
-  {
-    mWidget->mNativeKeyCommandsValid = true;
-    mWidget->mSingleLineCommands = aSingleLineCommands;
-    mWidget->mMultiLineCommands = aMultiLineCommands;
-    mWidget->mRichTextCommands = aRichTextCommands;
-  }
-
-  void CacheNoCommands()
-  {
-    mWidget->mNativeKeyCommandsValid = true;
-    mWidget->mSingleLineCommands.Clear();
-    mWidget->mMultiLineCommands.Clear();
-    mWidget->mRichTextCommands.Clear();
-  }
-
-  ~AutoCacheNativeKeyCommands()
-  {
-    mWidget->mNativeKeyCommandsValid = mSavedValid;
-    mWidget->mSingleLineCommands = mSavedSingleLine;
-    mWidget->mMultiLineCommands = mSavedMultiLine;
-    mWidget->mRichTextCommands = mSavedRichText;
-  }
-
-private:
-  PuppetWidget* mWidget;
-  bool mSavedValid;
-  InfallibleTArray<mozilla::CommandInt> mSavedSingleLine;
-  InfallibleTArray<mozilla::CommandInt> mSavedMultiLine;
-  InfallibleTArray<mozilla::CommandInt> mSavedRichText;
 };
 
 class PuppetScreen : public nsBaseScreen
 {
 public:
     explicit PuppetScreen(void* nativeScreen);
     ~PuppetScreen();
 

--- a/widget/android/GeckoEditableSupport.cpp
+++ b/widget/android/GeckoEditableSupport.cpp
@@ -458,20 +458,18 @@ GeckoEditableSupport::OnKeyEvent(int32_t
     WidgetKeyboardEvent pressEvent(true, eKeyPress, widget);
     InitKeyEvent(pressEvent, aAction, aKeyCode, aScanCode, aKeyPressMetaState,
                  aTime, aDomPrintableKeyValue, aRepeatCount, aFlags);
 
     if (aIsSynthesizedImeKey) {
         mIMEKeyEvents.AppendElement(
                 UniquePtr<WidgetEvent>(pressEvent.Duplicate()));
     } else if (nsIWidget::UsePuppetWidgets()) {
-        AutoCacheNativeKeyCommands autoCache(
-                static_cast<PuppetWidget*>(widget.get()));
         // Don't use native key bindings.
-        autoCache.CacheNoCommands();
+        pressEvent.PreventNativeKeyBindings();
         dispatcher->MaybeDispatchKeypressEvents(pressEvent, status);
     } else {
         dispatcher->MaybeDispatchKeypressEvents(pressEvent, status);
     }
 }
 
 /*
  * Send dummy key events for pages that are unaware of input events,
@@ -796,20 +794,18 @@ GeckoEditableSupport::OnImeReplaceText(i
                 const auto event = mIMEKeyEvents[i]->AsKeyboardEvent();
                 // widget for duplicated events is initially nullptr.
                 event->mWidget = widget;
 
                 if (event->mMessage != eKeyPress) {
                     mDispatcher->DispatchKeyboardEvent(
                             event->mMessage, *event, status);
                 } else if (nsIWidget::UsePuppetWidgets()) {
-                    AutoCacheNativeKeyCommands autoCache(
-                            static_cast<PuppetWidget*>(widget.get()));
                     // Don't use native key bindings.
-                    autoCache.CacheNoCommands();
+                    event->PreventNativeKeyBindings();
                     mDispatcher->MaybeDispatchKeypressEvents(*event, status);
                 } else {
                     mDispatcher->MaybeDispatchKeypressEvents(*event, status);
                 }
                 if (!mDispatcher || widget->Destroyed()) {
                     break;
                 }
             }