diff --git a/src/browser/components/sessionstore/SessionStore-sys-mjs.patch b/src/browser/components/sessionstore/SessionStore-sys-mjs.patch
index 94f08855d..7238d4a48 100644
--- a/src/browser/components/sessionstore/SessionStore-sys-mjs.patch
+++ b/src/browser/components/sessionstore/SessionStore-sys-mjs.patch
@@ -1,25 +1,17 @@
 diff --git a/browser/components/sessionstore/SessionStore.sys.mjs b/browser/components/sessionstore/SessionStore.sys.mjs
-index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be523e4feb 100644
+index eb62ff3e733e43fdaa299babddea3ba0125abb06..8f20ba50b06f5b75d7de08eb4d1b27d89fb95494 100644
 --- a/browser/components/sessionstore/SessionStore.sys.mjs
 +++ b/browser/components/sessionstore/SessionStore.sys.mjs
-@@ -127,6 +127,8 @@ const TAB_EVENTS = [
+@@ -126,6 +126,8 @@ const TAB_EVENTS = [
+   "TabUngrouped",
    "TabGroupCollapse",
    "TabGroupExpand",
-   "TabSplitViewActivate",
 +  "TabAddedToEssentials",
 +  "TabRemovedFromEssentials",
  ];
  
  const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
-@@ -196,6 +198,7 @@ ChromeUtils.defineESModuleGetters(lazy, {
-   TabStateCache: "resource:///modules/sessionstore/TabStateCache.sys.mjs",
-   TabStateFlusher: "resource:///modules/sessionstore/TabStateFlusher.sys.mjs",
-   setTimeout: "resource://gre/modules/Timer.sys.mjs",
-+  ZenSessionStore: "resource:///modules/zen/ZenSessionManager.sys.mjs",
- });
- 
- ChromeUtils.defineLazyGetter(lazy, "blankURI", () => {
-@@ -1911,6 +1914,8 @@ var SessionStoreInternal = {
+@@ -1904,6 +1906,8 @@ var SessionStoreInternal = {
        case "TabPinned":
        case "TabUnpinned":
        case "SwapDocShells":
@@ -28,7 +20,7 @@ index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be
          this.saveStateDelayed(win);
          break;
        case "TabGroupCreate":
-@@ -2151,7 +2156,6 @@ var SessionStoreInternal = {
+@@ -2139,7 +2143,6 @@ var SessionStoreInternal = {
        if (closedWindowState) {
          let newWindowState;
          if (
@@ -36,18 +28,7 @@ index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be
            !lazy.SessionStartup.willRestore()
          ) {
            // We want to split the window up into pinned tabs and unpinned tabs.
-@@ -2215,6 +2219,10 @@ var SessionStoreInternal = {
-       });
-       this._shouldRestoreLastSession = false;
-     }
-+    else if (!aInitialState && isRegularWindow) {
-+      aInitialState = lazy.ZenSessionStore.getNewWindowData(this._windows);
-+      this.restoreWindows(aWindow, aInitialState, {});
-+    }
- 
-     if (this._restoreLastWindow && aWindow.toolbar.visible) {
-       // always reset (if not a popup window)
-@@ -2384,11 +2392,9 @@ var SessionStoreInternal = {
+@@ -2372,11 +2375,9 @@ var SessionStoreInternal = {
            tabbrowser.selectedTab.label;
        }
  
@@ -59,7 +40,7 @@ index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be
  
        // Store the window's close date to figure out when each individual tab
        // was closed. This timestamp should allow re-arranging data based on how
-@@ -3373,7 +3379,7 @@ var SessionStoreInternal = {
+@@ -3361,7 +3362,7 @@ var SessionStoreInternal = {
      if (!isPrivateWindow && tabState.isPrivate) {
        return;
      }
@@ -68,7 +49,7 @@ index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be
        return;
      }
  
-@@ -4089,6 +4095,11 @@ var SessionStoreInternal = {
+@@ -4073,6 +4074,11 @@ var SessionStoreInternal = {
          Math.min(tabState.index, tabState.entries.length)
        );
        tabState.pinned = false;
@@ -81,7 +62,7 @@ index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be
  
        if (inBackground === false) {
          aWindow.gBrowser.selectedTab = newTab;
-@@ -4525,6 +4536,7 @@ var SessionStoreInternal = {
+@@ -4509,6 +4515,7 @@ var SessionStoreInternal = {
        // Append the tab if we're opening into a different window,
        tabIndex: aSource == aTargetWindow ? pos : Infinity,
        pinned: state.pinned,
@@ -89,7 +70,7 @@ index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be
        userContextId: state.userContextId,
        skipLoad: true,
        preferredRemoteType,
-@@ -5374,7 +5386,7 @@ var SessionStoreInternal = {
+@@ -5358,7 +5365,7 @@ var SessionStoreInternal = {
  
      for (let i = tabbrowser.pinnedTabCount; i < tabbrowser.tabs.length; i++) {
        let tab = tabbrowser.tabs[i];
@@ -98,7 +79,7 @@ index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be
          removableTabs.push(tab);
        }
      }
-@@ -5434,7 +5446,7 @@ var SessionStoreInternal = {
+@@ -5418,7 +5425,7 @@ var SessionStoreInternal = {
      }
  
      let workspaceID = aWindow.getWorkspaceID();
@@ -107,7 +88,7 @@ index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be
        winData.workspaceID = workspaceID;
      }
    },
-@@ -5625,11 +5637,12 @@ var SessionStoreInternal = {
+@@ -5609,11 +5616,12 @@ var SessionStoreInternal = {
      }
  
      let tabbrowser = aWindow.gBrowser;
@@ -121,7 +102,7 @@ index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be
      // update the internal state data for this window
      for (let tab of tabs) {
        if (tab == aWindow.FirefoxViewHandler.tab) {
-@@ -5640,6 +5653,7 @@ var SessionStoreInternal = {
+@@ -5624,6 +5632,7 @@ var SessionStoreInternal = {
        tabsData.push(tabData);
      }
  
@@ -129,7 +110,7 @@ index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be
      // update tab group state for this window
      winData.groups = [];
      for (let tabGroup of aWindow.gBrowser.tabGroups) {
-@@ -5652,7 +5666,7 @@ var SessionStoreInternal = {
+@@ -5636,7 +5645,7 @@ var SessionStoreInternal = {
      // a window is closed, point to the first item in the tab strip instead (it will never be the Firefox View tab,
      // since it's only inserted into the tab strip after it's selected).
      if (aWindow.FirefoxViewHandler.tab?.selected) {
@@ -138,7 +119,7 @@ index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be
        winData.title = tabbrowser.tabs[0].label;
      }
      winData.selected = selectedIndex;
-@@ -5764,8 +5778,8 @@ var SessionStoreInternal = {
+@@ -5748,8 +5757,8 @@ var SessionStoreInternal = {
      // selectTab represents.
      let selectTab = 0;
      if (overwriteTabs) {
@@ -149,7 +130,7 @@ index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be
        selectTab = Math.min(selectTab, winData.tabs.length);
      }
  
-@@ -5808,6 +5822,8 @@ var SessionStoreInternal = {
+@@ -5792,6 +5801,8 @@ var SessionStoreInternal = {
          winData.tabs,
          winData.groups ?? []
        );
@@ -158,7 +139,7 @@ index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be
        this._log.debug(
          `restoreWindow, createTabsForSessionRestore returned ${tabs.length} tabs`
        );
-@@ -6371,6 +6387,25 @@ var SessionStoreInternal = {
+@@ -6348,6 +6359,25 @@ var SessionStoreInternal = {
  
      // Most of tabData has been restored, now continue with restoring
      // attributes that may trigger external events.
@@ -172,8 +153,8 @@ index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be
 +    if (tabData.zenHasStaticLabel) {
 +      tab.setAttribute("zen-has-static-label", "true");
 +    }
-+    if (tabData.zenSyncId) {
-+      tab.setAttribute("zen-sync-id", tabData.zenSyncId);
++    if (tabData.zenPinnedId) {
++      tab.setAttribute("zen-pin-id", tabData.zenPinnedId);
 +    }
 +    if (tabData.zenDefaultUserContextId) {
 +      tab.setAttribute("zenDefaultUserContextId", true);
@@ -184,7 +165,7 @@ index 1cdbc0f41bf5b55dfbbd850cb618c6d870f7a261..2a7d429e2ed2f2be5bb554a5fb5fd2be
  
      if (tabData.pinned) {
        tabbrowser.pinTab(tab);
-@@ -7289,7 +7324,7 @@ var SessionStoreInternal = {
+@@ -7263,7 +7293,7 @@ var SessionStoreInternal = {
  
        let groupsToSave = new Map();
        for (let tIndex = 0; tIndex < window.tabs.length; ) {