--- a/mobile/android/geckoview/api.txt
+++ b/mobile/android/geckoview/api.txt
@@ -460,16 +460,17 @@ package org.mozilla.geckoview {
     field public static final int FINDER_FIND_WHOLE_WORD = 4;
     field public static final int LOAD_FLAGS_ALLOW_POPUPS = 8;
     field public static final int LOAD_FLAGS_BYPASS_CACHE = 1;
     field public static final int LOAD_FLAGS_BYPASS_CLASSIFIER = 16;
     field public static final int LOAD_FLAGS_BYPASS_PROXY = 2;
     field public static final int LOAD_FLAGS_EXTERNAL = 4;
     field public static final int LOAD_FLAGS_FORCE_ALLOW_DATA_URI = 32;
     field public static final int LOAD_FLAGS_NONE = 0;
+    field public static final int LOAD_FLAGS_REPLACE_HISTORY = 64;
     field @Nullable protected GeckoSession.Window mWindow;
   }
 
   public static interface GeckoSession.ContentDelegate {
     method @UiThread default public void onCloseRequest(@NonNull GeckoSession);
     method @UiThread default public void onContextMenu(@NonNull GeckoSession, int, int, @NonNull GeckoSession.ContentDelegate.ContextElement);
     method @UiThread default public void onCrash(@NonNull GeckoSession);
     method @UiThread default public void onExternalResponse(@NonNull GeckoSession, @NonNull GeckoSession.WebResponseInfo);

--- a/mobile/android/geckoview/src/main/java/org/mozilla/geckoview/GeckoSession.java
+++ b/mobile/android/geckoview/src/main/java/org/mozilla/geckoview/GeckoSession.java
@@ -1481,17 +1481,17 @@ public class GeckoSession implements Par
             }
         }
         return mAccessibility;
     }
 
     @Retention(RetentionPolicy.SOURCE)
     @IntDef(flag = true,
             value = { LOAD_FLAGS_NONE, LOAD_FLAGS_BYPASS_CACHE, LOAD_FLAGS_BYPASS_PROXY,
-                      LOAD_FLAGS_EXTERNAL, LOAD_FLAGS_ALLOW_POPUPS, LOAD_FLAGS_FORCE_ALLOW_DATA_URI })
+                      LOAD_FLAGS_EXTERNAL, LOAD_FLAGS_ALLOW_POPUPS, LOAD_FLAGS_FORCE_ALLOW_DATA_URI, LOAD_FLAGS_REPLACE_HISTORY })
     /* package */ @interface LoadFlags {}
 
     // These flags follow similarly named ones in Gecko's nsIWebNavigation.idl
     // https://searchfox.org/mozilla-central/source/docshell/base/nsIWebNavigation.idl
     //
     // We do not use the same values directly in order to insulate ourselves from
     // changes in Gecko. Instead, the flags are converted in GeckoViewNavigation.jsm.
 
@@ -1527,16 +1527,21 @@ public class GeckoSession implements Par
 
     /**
      * Allows a top-level data: navigation to occur. E.g. view-image
      * is an explicit user action which should be allowed.
      */
     public static final int LOAD_FLAGS_FORCE_ALLOW_DATA_URI = 1 << 5;
 
     /**
+     * This flag specifies that any existing history entry should be replaced.
+     */
+    public static final int LOAD_FLAGS_REPLACE_HISTORY = 1 << 6;
+
+    /**
      * Load the given URI.
      * @param uri The URI of the resource to load.
      */
     @AnyThread
     public void loadUri(final @NonNull String uri) {
         loadUri(uri, (GeckoSession)null, LOAD_FLAGS_NONE);
     }
 

--- 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
@@ -7,16 +7,18 @@ exclude: true
 ---
 
 {% capture javadoc_uri %}{{ site.url }}{{ site.baseurl}}/javadoc/mozilla-central/org/mozilla/geckoview{% endcapture %}
 
 # GeckoView API Changelog.
 
 ## v70
 
+- Add GeckoSession.LOAD_FLAGS_REPLACE_HISTORY
+
 - Removed the obsolete `success` parameter from
   [`CrashReporter#sendCrashReport(Context, File, File, String)`][70.3] and
   [`CrashReporter#sendCrashReport(Context, File, Map, String)`][70.4].
 - Added API for session context assignment
   [`GeckoSessionSettings.Builder.contextId`][70.1] and deletion of data
   related to a session context
   [`StorageController.clearDataForSessionContext`][70.2].
 - Removed `setSession(session, runtime)` from [`GeckoView`][70.5]. With this change, `GeckoView` will no longer
@@ -284,9 +286,9 @@ exclude: true
 [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]: b101f0344e941cb50eaaf75326e126ce3efc52b4
+[api-version]: d2e22c0efa7c1dbec1f68965e035a9ccc47eca39

--- a/mobile/android/modules/geckoview/GeckoViewNavigation.jsm
+++ b/mobile/android/modules/geckoview/GeckoViewNavigation.jsm
@@ -129,16 +129,20 @@ class GeckoViewNavigation extends GeckoV
         if (flags & (1 << 4)) {
           navFlags |= Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_CLASSIFIER;
         }
 
         if (flags & (1 << 5)) {
           navFlags |= Ci.nsIWebNavigation.LOAD_FLAGS_FORCE_ALLOW_DATA_URI;
         }
 
+        if (flags & (1 << 6)) {
+          navFlags |= Ci.nsIWebNavigation.LOAD_FLAGS_REPLACE_HISTORY;
+        }
+
         if (this.settings.useMultiprocess) {
           this.moduleManager.updateRemoteTypeForURI(uri);
         }
 
         let triggeringPrincipal, referrerInfo, csp;
         if (referrerSessionId) {
           const referrerWindow = Services.ww.getWindowByName(
             referrerSessionId,