--- a/mobile/android/base/java/org/mozilla/gecko/GeckoActivityMonitor.java
+++ b/mobile/android/base/java/org/mozilla/gecko/GeckoActivityMonitor.java
@@ -12,17 +12,16 @@ import android.os.Bundle;
 
 import java.lang.ref.WeakReference;
 
 public class GeckoActivityMonitor implements Application.ActivityLifecycleCallbacks {
     private static final String LOGTAG = "GeckoActivityMonitor";
 
     private static final GeckoActivityMonitor instance = new GeckoActivityMonitor();
 
-    private GeckoApplication appContext;
     private WeakReference<Activity> currentActivity = new WeakReference<>(null);
 
     public static GeckoActivityMonitor getInstance() {
         return instance;
     }
 
     private GeckoActivityMonitor() { }
 
@@ -56,17 +55,17 @@ public class GeckoActivityMonitor implem
 
     @Override
     public void onActivityPaused(Activity activity) { }
 
     @Override
     public void onActivityStopped(Activity activity) {
         // onStop for the previous activity is called after onStart/onResume for
         // the new/resumed activity, so if we're switching activities within our
-        // app, mCurrentActivity should already refer to the next activity at
+        // app, currentActivity should already refer to the next activity at
         // this point.
         // If it doesn't, it means we've been backgrounded.
         if (currentActivity.get() == activity) {
             currentActivity.clear();
             ((GeckoApplication) activity.getApplication()).onApplicationBackground();
         }
     }