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diff --git a/mobile/android/components/extensions/test/mochitest/test_ext_tabs_query.html b/mobile/android/components/extensions/test/mochitest/test_ext_tabs_query.html
new file mode 100644
index 0000000000..9a907f47de
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+++ b/mobile/android/components/extensions/test/mochitest/test_ext_tabs_query.html
@@ -0,0 +1,46 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Tabs create Test</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/ExtensionTestUtils.js"></script>
+  <script type="text/javascript" src="head.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<script type="text/javascript">
+"use strict";
+
+add_task(async function test_query_index() {
+  const extension = ExtensionTestUtils.loadExtension({
+    background: function() {
+      browser.tabs.onCreated.addListener(async function({index, windowId, id}) {
+        browser.test.assertThrows(
+          () => browser.tabs.query({index: -1}),
+          /-1 is too small \(must be at least 0\)/,
+          "tab indices must be non-negative");
+
+        let tabs = await browser.tabs.query({index, windowId});
+        browser.test.assertEq(tabs.length, 1, `Got one tab at index ${index}`);
+        browser.test.assertEq(tabs[0].id, id, "The tab is the right one");
+
+        tabs = await browser.tabs.query({index: 1e5, windowId});
+        browser.test.assertEq(tabs.length, 0, "There is no tab at this index");
+
+        browser.test.notifyPass("tabs.query");
+      });
+    },
+  });
+
+  await extension.startup();
+  const win = window.open("http://example.com");
+  await extension.awaitFinish("tabs.query");
+  win.close();
+  await extension.unload();
+});
+</script>
+
+</body>
+</html>