add_task(async function parent_to_remote() { await BrowserTestUtils.withNewTab("about:mozilla", async browser => { let originalBC = browser.browsingContext; BrowserTestUtils.startLoadingURIString(browser, "https://example.com/"); await BrowserTestUtils.browserLoaded(browser); let newBC = browser.browsingContext; isnot(originalBC.id, newBC.id, "Should have replaced the BrowsingContext"); }); }); add_task(async function remote_to_parent() { await BrowserTestUtils.withNewTab("https://example.com/", async browser => { let originalBC = browser.browsingContext; BrowserTestUtils.startLoadingURIString(browser, "about:mozilla"); await BrowserTestUtils.browserLoaded(browser); let newBC = browser.browsingContext; isnot(originalBC.id, newBC.id, "Should have replaced the BrowsingContext"); }); });