--- a/widget/gtk2/nsWindow.cpp
+++ b/widget/gtk2/nsWindow.cpp
@@ -5902,18 +5902,23 @@ nsWindow::SetInputContext(const InputCon
 
 NS_IMETHODIMP_(InputContext)
 nsWindow::GetInputContext()
 {
   InputContext context;
   if (!mIMModule) {
       context.mIMEState.mEnabled = IMEState::DISABLED;
       context.mIMEState.mOpen = IMEState::OPEN_STATE_NOT_SUPPORTED;
+      // If IME context isn't available on this widget, we should set |this|
+      // instead of nullptr since nullptr means that the platform has only one
+      // context per process.
+      context.mNativeIMEContext = this;
   } else {
       context = mIMModule->GetInputContext();
+      context.mNativeIMEContext = mIMModule;
   }
   return context;
 }
 
 NS_IMETHODIMP
 nsWindow::CancelIMEComposition()
 {
     return mIMModule ? mIMModule->CancelIMEComposition(this) : NS_OK;

--- a/widget/qt/nsWindow.cpp
+++ b/widget/qt/nsWindow.cpp
@@ -3184,16 +3184,19 @@ nsWindow::SetInputContext(const InputCon
             break;
     }
 }
 
 NS_IMETHODIMP_(InputContext)
 nsWindow::GetInputContext()
 {
     mInputContext.mIMEState.mOpen = IMEState::OPEN_STATE_NOT_SUPPORTED;
+    // Our qt widget looks like using only one context per process.
+    // However, it's better to set the context's pointer.
+    mInputContext.mNativeIMEContext = qApp->inputContext();
     return mInputContext;
 }
 
 void
 nsWindow::SetSoftwareKeyboardState(bool aOpen,
                                    const InputContextAction& aAction)
 {
     if (aOpen) {