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diff --git a/toolkit/components/extensions/test/mochitest/test_ext_script_filenames.html b/toolkit/components/extensions/test/mochitest/test_ext_script_filenames.html
new file mode 100644
index 0000000000..de0993c33d
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+++ b/toolkit/components/extensions/test/mochitest/test_ext_script_filenames.html
@@ -0,0 +1,62 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Script Filenames 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_tabs_executeScript() {
+  let validFileName = "script.js";
+  let invalidFileName = "script.xyz";
+
+  async function background() {
+    await browser.tabs.executeScript({ file: "script.js" });
+
+    await browser.test.assertRejects(
+      browser.tabs.executeScript({ file: "script.xyz" }),
+      Error,
+      "invalid filename does not execute"
+    );
+    browser.test.notifyPass("execute-script");
+  }
+
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      permissions: ["<all_urls>"],
+    },
+
+    background,
+
+    files: {
+      [validFileName]: function contentScript1() {
+        browser.test.sendMessage("content-script-loaded");
+      },
+      [invalidFileName]: function contentScript2() {
+        browser.test.fail("this script should not be loaded");
+      },
+    },
+  });
+
+  let tab = await AppTestDelegate.openNewForegroundTab(
+    window,
+    "http://mochi.test:8888/",
+    true
+  );
+  await extension.startup();
+
+  await extension.awaitMessage("content-script-loaded");
+  await extension.awaitFinish("execute-script");
+
+  await extension.unload();
+  await AppTestDelegate.removeTab(window, tab);
+});
+</script>
+</body>
+</html>