2 files changed, 0 insertions, 19 deletions
diff --git a/browser/base/content/tabbrowser.js b/browser/base/content/tabbrowser.js
index f56e1f0a01..678e923d5c 100644
--- a/browser/base/content/tabbrowser.js
+++ b/browser/base/content/tabbrowser.js
@@ -2128,18 +2128,6 @@
       // doesn't keep the window alive.
       b.permanentKey = new (Cu.getGlobalForObject(Services).Object)();
 
-      // Ensure that SessionStore has flushed any session history state from the
-      // content process before we this browser's remoteness.
-      if (!Services.appinfo.sessionHistoryInParent) {
-        b.prepareToChangeRemoteness = () =>
-          SessionStore.prepareToChangeRemoteness(b);
-        b.afterChangeRemoteness = switchId => {
-          let tab = this.getTabForBrowser(b);
-          SessionStore.finishTabRemotenessChange(tab, switchId);
-          return true;
-        };
-      }
-
       const defaultBrowserAttributes = {
         contextmenu: "contentAreaContextMenu",
         message: "true",
diff --git a/browser/base/content/test/performance/browser_startup_content.js b/browser/base/content/test/performance/browser_startup_content.js
index 330f9b7655..fa7bef7ae9 100644
--- a/browser/base/content/test/performance/browser_startup_content.js
+++ b/browser/base/content/test/performance/browser_startup_content.js
@@ -55,12 +55,6 @@ const known_scripts = {
   ]),
 };
 
-if (!Services.appinfo.sessionHistoryInParent) {
-  known_scripts.modules.add(
-    "resource:///modules/sessionstore/ContentSessionStore.sys.mjs"
-  );
-}
-
 if (AppConstants.NIGHTLY_BUILD) {
   // Browser front-end.
   known_scripts.modules.add("resource:///actors/InteractionsChild.sys.mjs");
@@ -71,7 +65,6 @@ if (AppConstants.NIGHTLY_BUILD) {
 const intermittently_loaded_scripts = {
   modules: new Set([
     "resource://gre/modules/nsAsyncShutdown.sys.mjs",
-    "resource://gre/modules/sessionstore/Utils.sys.mjs",
 
     // Translations code which may be preffed on.
     "resource://gre/actors/TranslationsChild.sys.mjs",