ChromeUtils.import("resource://gre/modules/Services.jsm"); add_task(async function() { info("Starting test"); await SpecialPowers.flushPrefEnv(); await SpecialPowers.pushPrefEnv({"set": [ ["privacy.trackingprotection.enabled", true], // prevent the content blocking on-boarding UI to start mid-way through the test! [ContentBlocking.prefIntroCount, ContentBlocking.MAX_INTROS], ]}); await UrlClassifierTestUtils.addTestTrackers(); let extension = ExtensionTestUtils.loadExtension({ manifest: {permissions: ["https://tracking.example.com/"]}, files: { "page.html": '', }, async background() { browser.test.sendMessage("ready", browser.runtime.getURL("page.html")); }, }); await extension.startup(); let url = await extension.awaitMessage("ready"); info("Creating a new tab"); let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url); let browser = tab.linkedBrowser; info("Verify the number of script nodes found"); await ContentTask.spawn(browser, {}, async function(obj) { let doc = content.document.querySelector("iframe").contentDocument; doc = doc.querySelector("iframe").contentDocument; let scripts = doc.querySelectorAll("script"); is(scripts.length, 3, "Expected script nodes found"); }); info("Removing the tab"); BrowserTestUtils.removeTab(tab); UrlClassifierTestUtils.cleanupTestTrackers(); await extension.unload(); });