From e983f76e0941c6912f896209d86d68c941f58bd1 Mon Sep 17 00:00:00 2001
From: Eugen Istoc <eugenistoc@gmail.com>
Date: Sun, 22 Mar 2026 09:26:35 -0400
Subject: [PATCH] fix: prevent live folder dismissed tabs from reappearing

---
 .../ZenLiveFoldersManager.sys.mjs             | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/src/zen/live-folders/ZenLiveFoldersManager.sys.mjs b/src/zen/live-folders/ZenLiveFoldersManager.sys.mjs
index cb27529898..8049ca4e62 100644
--- a/src/zen/live-folders/ZenLiveFoldersManager.sys.mjs
+++ b/src/zen/live-folders/ZenLiveFoldersManager.sys.mjs
@@ -384,13 +384,18 @@ class nsZenLiveFoldersManager {
       animate: !folder.collapsed,
     });
 
-    // Remove the dismissed items that are no longer in the given list
-    for (const dismissedItemId of this.dismissedItems) {
-      if (
-        dismissedItemId.startsWith(`${liveFolder.id}:`) &&
-        !itemIds.has(dismissedItemId)
-      ) {
-        this.dismissedItems.delete(dismissedItemId);
+    // Remove the dismissed items that are no longer in the given list.
+    // Only do this when the fetch returned results — an empty list may
+    // indicate a transient failure (e.g. auth expired, HTML changed)
+    // and we must not wipe all dismissals in that case.
+    if (itemIds.size > 0) {
+      for (const dismissedItemId of this.dismissedItems) {
+        if (
+          dismissedItemId.startsWith(`${liveFolder.id}:`) &&
+          !itemIds.has(dismissedItemId)
+        ) {
+          this.dismissedItems.delete(dismissedItemId);
+        }
       }
     }