1 files changed, 48 insertions, 0 deletions
diff --git a/browser/components/extensions/test/browser/browser_ext_sidebarAction_tabs.js b/browser/components/extensions/test/browser/browser_ext_sidebarAction_tabs.js
new file mode 100644
index 0000000000..7af75cdc19
--- /dev/null
+++ b/browser/components/extensions/test/browser/browser_ext_sidebarAction_tabs.js
@@ -0,0 +1,48 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+"use strict";
+
+add_task(async function sidebar_tab_query_bug_1340739() {
+  let data = {
+    manifest: {
+      permissions: ["tabs"],
+      sidebar_action: {
+        default_panel: "sidebar.html",
+      },
+    },
+    useAddonManager: "temporary",
+    files: {
+      "sidebar.html": `
+        <!DOCTYPE html>
+        <html>
+        <head><meta charset="utf-8"/>
+        <script src="sidebar.js"></script>
+        </head>
+        <body>
+        A Test Sidebar
+        </body></html>
+      `,
+      "sidebar.js": function () {
+        Promise.all([
+          browser.tabs.query({}).then(tabs => {
+            browser.test.assertEq(
+              1,
+              tabs.length,
+              "got tab without currentWindow"
+            );
+          }),
+          browser.tabs.query({ currentWindow: true }).then(tabs => {
+            browser.test.assertEq(1, tabs.length, "got tab with currentWindow");
+          }),
+        ]).then(() => {
+          browser.test.sendMessage("sidebar");
+        });
+      },
+    },
+  };
+
+  let extension = ExtensionTestUtils.loadExtension(data);
+  await extension.startup();
+  await extension.awaitMessage("sidebar");
+  await extension.unload();
+});