diff --git a/src/zen/sessionstore/ZenWindowSync.sys.mjs b/src/zen/sessionstore/ZenWindowSync.sys.mjs
index f4f993923..60fcd843b 100644
--- a/src/zen/sessionstore/ZenWindowSync.sys.mjs
+++ b/src/zen/sessionstore/ZenWindowSync.sys.mjs
@@ -769,8 +769,8 @@ class nsZenWindowSync {
     const otherBrowser = aTab.linkedBrowser;
 
     // We aren't closing the other tab so, we also need to swap its tablisteners.
-    let filter = otherTabBrowser._tabFilters.get(aTab);
-    let tabListener = otherTabBrowser._tabListeners.get(aTab);
+    let filter = otherTabBrowser._getTabProgressFilter(aTab);
+    let tabListener = otherTabBrowser._getTabProgressListener(aTab);
     try {
       otherBrowser.webProgress.removeProgressListener(filter);
       filter.removeProgressListener(tabListener);
@@ -792,7 +792,7 @@ class nsZenWindowSync {
         true,
         false
       );
-      otherTabBrowser._tabListeners.set(aTab, tabListener);
+      otherTabBrowser._setTabProgressListener(aTab, tabListener);
 
       const notifyAll = Ci.nsIWebProgress.NOTIFY_ALL;
       filter.addProgressListener(tabListener, notifyAll);