diff --git a/lib/browser/api/extensions.js b/lib/browser/api/extensions.js
index abc11a82ac..0063db228a 100644
--- a/lib/browser/api/extensions.js
+++ b/lib/browser/api/extensions.js
@@ -344,6 +344,11 @@ const tabsQuery = function (queryInfo = {}, useCurrentWindowId = false) {
 
   var result = []
   tabIds.forEach((tabId) => {
+    // never add the master Brave container window
+    if (tabValues[tabId].url.startsWith('chrome://brave')) {
+      return
+    }
+
     // delete tab from the list if any key doesn't match
     if (!queryKeys.map((queryKey) => (tabValues[tabId][queryKey] === queryInfo[queryKey])).includes(false)) {
       result.push(tabValues[tabId])