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Test Info:

<!doctype html>
<title>Test sendMessage frameId</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/ExtensionTestUtils.js"></script>
<script src="head.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
"use strict";
add_task(async function test_sendMessage_frameId() {
const html = `<!doctype html><meta charset="utf-8"><script src="script.js"><\/script>`;
const extension = ExtensionTestUtils.loadExtension({
background() {
browser.runtime.onMessage.addListener((msg, sender) => {
browser.test.sendMessage(msg, sender);
browser.tabs.create({url: "tab.html"});
files: {
"iframe.html": html,
"tab.html": `${html}<iframe src="iframe.html"></iframe>`,
"script.js": () => {
browser.runtime.sendMessage( === window ? "tab" : "iframe");
await extension.startup();
const tab = await extension.awaitMessage("tab");
ok(tab.url.endsWith("tab.html"), "Got the message from the tab");
is(tab.frameId, 0, "And sender.frameId is zero");
const iframe = await extension.awaitMessage("iframe");
ok(iframe.url.endsWith("iframe.html"), "Got the message from the iframe");
is(typeof iframe.frameId, "number", "With sender.frameId of type number");
ok(iframe.frameId > 0, "And sender.frameId greater than zero");
await extension.unload();