--- a/mobile/android/geckoview/api.txt
+++ b/mobile/android/geckoview/api.txt
@@ -2817,17 +2817,17 @@ package org.mozilla.geckoview {
 
   public class WebNotification implements Parcelable {
     method @UiThread public void click();
     method @UiThread public void dismiss();
     field public static final Parcelable.Creator<WebNotification> CREATOR;
     field @Nullable public final String imageUrl;
     field @Nullable public final String lang;
     field public final boolean privateBrowsing;
-    field @NonNull public final boolean requireInteraction;
+    field public final boolean requireInteraction;
     field public final boolean silent;
     field @Nullable public final String source;
     field @NonNull public final String tag;
     field @Nullable public final String text;
     field @Nullable public final String textDirection;
     field @Nullable public final String title;
     field @NonNull public final int[] vibrate;
   }

--- a/mobile/android/geckoview/src/main/java/org/mozilla/geckoview/WebNotification.java
+++ b/mobile/android/geckoview/src/main/java/org/mozilla/geckoview/WebNotification.java
@@ -5,16 +5,17 @@
 package org.mozilla.geckoview;
 
 import android.os.Parcel;
 import android.os.ParcelFormatException;
 import android.os.Parcelable;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.UiThread;
+import java.util.Objects;
 import org.mozilla.gecko.GeckoAppShell;
 import org.mozilla.gecko.annotation.WrapForJNI;
 import org.mozilla.gecko.util.ThreadUtils;
 
 /**
  * This class represents a single <a
  * href="https://developer.mozilla.org/en-US/docs/Web/API/Notification">Web Notification</a>. These
  * can be received by connecting a {@link WebNotificationDelegate} to {@link GeckoRuntime} via
@@ -75,17 +76,17 @@ public class WebNotification implements 
   /**
    * RequireInteraction indicates whether a notification should remain active until the user clicks
    * or dismisses it, rather than closing automatically.
    *
    * @see <a
    *     href="https://developer.mozilla.org/en-US/docs/Web/API/Notification/requireInteraction">Web
    *     Notification - requireInteraction</a>
    */
-  public final @NonNull boolean requireInteraction;
+  public final boolean requireInteraction;
 
   /**
    * This is the URL of the page or Service Worker that generated the notification. Null if this
    * notification was not generated by a Web Page (e.g. from an Extension).
    *
    * <p>TODO: make NonNull once we have Bug 1589693
    */
   public final @Nullable String source;
@@ -116,30 +117,30 @@ public class WebNotification implements 
   /* package */ WebNotification(
       @Nullable final String title,
       @NonNull final String tag,
       @Nullable final String cookie,
       @Nullable final String text,
       @Nullable final String imageUrl,
       @Nullable final String textDirection,
       @Nullable final String lang,
-      @NonNull final boolean requireInteraction,
+      final boolean requireInteraction,
       @NonNull final String source,
       final boolean silent,
       final boolean privateBrowsing,
       @NonNull final int[] vibrate) {
     this.tag = tag;
     this.mCookie = cookie;
     this.title = title;
     this.text = text;
     this.imageUrl = imageUrl;
     this.textDirection = textDirection;
     this.lang = lang;
     this.requireInteraction = requireInteraction;
-    this.source = "".equals(source) ? null : source;
+    this.source = source.isEmpty() ? null : source;
     this.silent = silent;
     this.vibrate = vibrate;
     this.privateBrowsing = privateBrowsing;
   }
 
   /**
    * This should be called when the user taps or clicks a notification. Note that this does not
    * automatically dismiss the notification as far as Web Content is concerned. For that, see {@link
@@ -174,43 +175,43 @@ public class WebNotification implements 
 
   @Override
   public void writeToParcel(final Parcel dest, final int flags) {
     dest.writeInt(VERSION);
     dest.writeString(title);
     dest.writeString(tag);
     dest.writeString(mCookie);
     dest.writeString(text);
-    if (imageUrl.length() < IMAGE_URL_LENGTH_MAX) {
+    if (imageUrl != null && imageUrl.length() < IMAGE_URL_LENGTH_MAX) {
       dest.writeString(imageUrl);
     } else {
       dest.writeString("");
     }
     dest.writeString(textDirection);
     dest.writeString(lang);
     dest.writeInt(requireInteraction ? 1 : 0);
     dest.writeString(source);
     dest.writeInt(silent ? 1 : 0);
     dest.writeInt(privateBrowsing ? 1 : 0);
     dest.writeIntArray(vibrate);
   }
 
   private WebNotification(final Parcel in) {
     title = in.readString();
-    tag = in.readString();
+    tag = Objects.requireNonNull(in.readString());
     mCookie = in.readString();
     text = in.readString();
     imageUrl = in.readString();
     textDirection = in.readString();
     lang = in.readString();
     requireInteraction = in.readInt() == 1;
     source = in.readString();
     silent = in.readInt() == 1;
     privateBrowsing = in.readInt() == 1;
-    vibrate = in.createIntArray();
+    vibrate = Objects.requireNonNull(in.createIntArray());
   }
 
   public static final Creator<WebNotification> CREATOR =
       new Creator<>() {
         @Override
         public WebNotification createFromParcel(final Parcel in) {
           final int version = in.readInt();
           if (version != VERSION) {

--- a/mobile/android/geckoview/src/main/java/org/mozilla/geckoview/doc-files/CHANGELOG.md
+++ b/mobile/android/geckoview/src/main/java/org/mozilla/geckoview/doc-files/CHANGELOG.md
@@ -1700,9 +1700,9 @@ to allow adding gecko profiler markers.
 [65.19]: {{javadoc_uri}}/GeckoSession.NavigationDelegate.LoadRequest.html#isRedirect
 [65.20]: {{javadoc_uri}}/GeckoSession.html#LOAD_FLAGS_BYPASS_CLASSIFIER
 [65.21]: {{javadoc_uri}}/GeckoSession.ContentDelegate.ContextElement.html
 [65.22]: {{javadoc_uri}}/GeckoSession.ContentDelegate.html#onContextMenu(org.mozilla.geckoview.GeckoSession,int,int,org.mozilla.geckoview.GeckoSession.ContentDelegate.ContextElement)
 [65.23]: {{javadoc_uri}}/GeckoSession.FinderResult.html
 [65.24]: {{javadoc_uri}}/CrashReporter.html#sendCrashReport(android.content.Context,android.os.Bundle,java.lang.String)
 [65.25]: {{javadoc_uri}}/GeckoResult.html
 
-[api-version]: f538591c2dfeec76c798c4c1b77639ac544f8aff
+[api-version]: b51ff966a5b8afe9a5b130e2fc13f0aada807c90