diff --git a/browser/components/sessionstore/SessionStartup.sys.mjs b/browser/components/sessionstore/SessionStartup.sys.mjs
index 919d4536c5462603346684bbe26794ae9279b517..5a8fae0708e4a9a82c5e85f8a473ebaeafebe71f 100644
--- a/browser/components/sessionstore/SessionStartup.sys.mjs
+++ b/browser/components/sessionstore/SessionStartup.sys.mjs
@@ -41,6 +41,7 @@ const lazy = XPCOMUtils.declareLazy({
     "moz-src:///browser/components/sessionstore/StartupPerformance.sys.mjs",
   sessionStoreLogger:
     "moz-src:///browser/components/sessionstore/SessionLogger.sys.mjs",
+  ZenSessionStore: "resource:///modules/zen/ZenSessionManager.sys.mjs",
 });
 
 const STATE_RUNNING_STR = "running";
@@ -86,7 +87,7 @@ export var SessionStartup = {
     }
 
     // do not need to initialize anything in auto-started private browsing sessions
-    if (lazy.PrivateBrowsingUtils.permanentPrivateBrowsing) {
+    if (false) {
       this._initialized = true;
       gOnceInitializedDeferred.resolve();
       return;
@@ -180,6 +181,8 @@ export var SessionStartup = {
       this._initialState = parsed;
     }
 
+    this._initialState = lazy.ZenSessionStore.onFileRead(this._initialState);
+
     if (this._initialState == null) {
       // No valid session found.
       this._sessionType = this.NO_SESSION;
@@ -277,6 +280,8 @@ export var SessionStartup = {
         `Previous shutdown ok? ${this._previousSessionCrashed}, reason: ${previousSessionCrashedReason}`
       );
 
+      lazy.ZenSessionStore.onCrashCheckpoints(this._initialState);
+
       Services.obs.addObserver(this, "sessionstore-windows-restored", true);
 
       if (this.sessionType == this.NO_SESSION) {
@@ -337,12 +342,7 @@ export var SessionStartup = {
   isAutomaticRestoreEnabled() {
     if (this._resumeSessionEnabled === null) {
       this._resumeSessionEnabled =
-        !lazy.PrivateBrowsingUtils.permanentPrivateBrowsing &&
-        (Services.prefs.getBoolPref(
-          "browser.sessionstore.resume_session_once"
-        ) ||
-          Services.prefs.getIntPref("browser.startup.page") ==
-            BROWSER_STARTUP_RESUME_SESSION);
+        true;
     }
 
     return this._resumeSessionEnabled;
@@ -355,8 +355,7 @@ export var SessionStartup = {
    */
   willRestore() {
     return (
-      this.sessionType == this.RECOVER_SESSION ||
-      this.sessionType == this.RESUME_SESSION
+      true
     );
   },