Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

9 files changed, 666 insertions, 0 deletions

diff --git a/browser/extensions/report-site-issue/test/browser/browser.ini b/browser/extensions/report-site-issue/test/browser/browser.ini
new file mode 100644
index 0000000000..b7319db18a
--- /dev/null
+++ b/browser/extensions/report-site-issue/test/browser/browser.ini
@@ -0,0 +1,14 @@
+[DEFAULT]
+support-files =
+  frameworks.html
+  fastclick.html
+  head.js
+  test.html
+  webcompat.html
+
+[browser_disabled_cleanup.js]
+skip-if = true # Disabled until we figure out why it is failing in bug 1775526
+[browser_button_state.js]
+skip-if = true # Disabled until we figure out why it is failing in bug 1775526
+[browser_report_site_issue.js]
+skip-if = true # Disabled until we figure out why it is failing in bug 1775526
diff --git a/browser/extensions/report-site-issue/test/browser/browser_button_state.js b/browser/extensions/report-site-issue/test/browser/browser_button_state.js
new file mode 100644
index 0000000000..6111a26975
--- /dev/null
+++ b/browser/extensions/report-site-issue/test/browser/browser_button_state.js
@@ -0,0 +1,52 @@
+"use strict";
+
+const REPORTABLE_PAGE = "http://example.com/";
+const REPORTABLE_PAGE2 = "https://example.com/";
+const NONREPORTABLE_PAGE = "about:mozilla";
+
+/* Test that the Report Site Issue help menu item is enabled for http and https tabs,
+   on page load, or TabSelect, and disabled for everything else. */
+add_task(async function test_button_state_disabled() {
+  await SpecialPowers.pushPrefEnv({ set: [[PREF_WC_REPORTER_ENABLED, true]] });
+
+  let tab1 = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    REPORTABLE_PAGE
+  );
+  const menu = new HelpMenuHelper();
+  await menu.open();
+  is(
+    menu.isItemEnabled(),
+    true,
+    "Check that panel item is enabled for reportable schemes on tab load"
+  );
+  await menu.close();
+
+  let tab2 = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    NONREPORTABLE_PAGE
+  );
+  await menu.open();
+  is(
+    menu.isItemEnabled(),
+    false,
+    "Check that panel item is disabled for non-reportable schemes on tab load"
+  );
+  await menu.close();
+
+  let tab3 = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    REPORTABLE_PAGE2
+  );
+  await menu.open();
+  is(
+    menu.isItemEnabled(),
+    true,
+    "Check that panel item is enabled for reportable schemes on tab load"
+  );
+  await menu.close();
+
+  await BrowserTestUtils.removeTab(tab1);
+  await BrowserTestUtils.removeTab(tab2);
+  await BrowserTestUtils.removeTab(tab3);
+});
diff --git a/browser/extensions/report-site-issue/test/browser/browser_disabled_cleanup.js b/browser/extensions/report-site-issue/test/browser/browser_disabled_cleanup.js
new file mode 100644
index 0000000000..c047bca27d
--- /dev/null
+++ b/browser/extensions/report-site-issue/test/browser/browser_disabled_cleanup.js
@@ -0,0 +1,41 @@
+"use strict";
+
+// Test the addon is cleaning up after itself when disabled.
+add_task(async function test_disabled() {
+  await promiseAddonEnabled();
+
+  SpecialPowers.Services.prefs.setBoolPref(PREF_WC_REPORTER_ENABLED, false);
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "http://example.com" },
+    async function() {
+      const menu = new HelpMenuHelper();
+      await menu.open();
+      is(
+        menu.isItemHidden(),
+        true,
+        "Report Site Issue help menu item is hidden."
+      );
+      await menu.close();
+    }
+  );
+
+  await promiseAddonEnabled();
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "http://example.com" },
+    async function() {
+      const menu = new HelpMenuHelper();
+      await menu.open();
+      is(
+        await menu.isItemHidden(),
+        false,
+        "Report Site Issue help menu item is visible."
+      );
+      await menu.close();
+    }
+  );
+
+  // Shut down the addon at the end,or the new instance started when we re-enabled it will "leak".
+  SpecialPowers.Services.prefs.setBoolPref(PREF_WC_REPORTER_ENABLED, false);
+});
diff --git a/browser/extensions/report-site-issue/test/browser/browser_report_site_issue.js b/browser/extensions/report-site-issue/test/browser/browser_report_site_issue.js
new file mode 100644
index 0000000000..d02523f9be
--- /dev/null
+++ b/browser/extensions/report-site-issue/test/browser/browser_report_site_issue.js
@@ -0,0 +1,294 @@
+"use strict";
+
+async function clickToReportAndAwaitReportTabLoad() {
+  const helpMenu = new HelpMenuHelper();
+  await helpMenu.open();
+
+  // click on "report site issue" and wait for the new tab to open
+  const tab = await new Promise(resolve => {
+    gBrowser.tabContainer.addEventListener(
+      "TabOpen",
+      event => {
+        resolve(event.target);
+      },
+      { once: true }
+    );
+    document.getElementById("help_reportSiteIssue").click();
+  });
+
+  // wait for the new tab to acknowledge that it received a screenshot
+  await BrowserTestUtils.waitForContentEvent(
+    gBrowser.selectedBrowser,
+    "ScreenshotReceived",
+    false,
+    null,
+    true
+  );
+
+  await helpMenu.close();
+
+  return tab;
+}
+
+add_task(async function start_issue_server() {
+  requestLongerTimeout(2);
+
+  const serverLanding = await startIssueServer();
+
+  // ./head.js sets the value for PREF_WC_REPORTER_ENDPOINT
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["datareporting.healthreport.uploadEnabled", true],
+      [PREF_WC_REPORTER_ENABLED, true],
+      [PREF_WC_REPORTER_ENDPOINT, serverLanding],
+    ],
+  });
+});
+
+/* Test that clicking on the Report Site Issue button opens a new tab
+   and sends a postMessaged blob to it. */
+add_task(async function test_opened_page() {
+  let tab1 = await BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_PAGE);
+  let tab2 = await clickToReportAndAwaitReportTabLoad();
+
+  await SpecialPowers.spawn(tab2.linkedBrowser, [{ TEST_PAGE }], async function(
+    args
+  ) {
+    async function isGreen(dataUrl) {
+      const getPixel = await new Promise(resolve => {
+        const myCanvas = content.document.createElement("canvas");
+        const ctx = myCanvas.getContext("2d");
+        const img = new content.Image();
+        img.onload = () => {
+          ctx.drawImage(img, 0, 0);
+          resolve((x, y) => {
+            return ctx.getImageData(x, y, 1, 1).data;
+          });
+        };
+        img.src = dataUrl;
+      });
+      function isPixelGreenFuzzy(p) {
+        // jpeg, so it will be off slightly
+        const fuzz = 4;
+        return p[0] < fuzz && Math.abs(p[1] - 128) < fuzz && p[2] < fuzz;
+      }
+      ok(isPixelGreenFuzzy(getPixel(0, 0)), "The pixels were green");
+    }
+
+    let doc = content.document;
+    let urlParam = doc.getElementById("url").innerText;
+    let preview = doc.getElementById("screenshot-preview");
+    const URL =
+      "http://example.com/browser/browser/extensions/report-site-issue/test/browser/test.html";
+    is(
+      urlParam,
+      args.TEST_PAGE,
+      "Reported page is correctly added to the url param"
+    );
+
+    let docShell = content.docShell;
+    is(
+      typeof docShell.getHasTrackingContentBlocked,
+      "function",
+      "docShell.hasTrackingContentBlocked is available"
+    );
+
+    let detailsParam = doc.getElementById("details").innerText;
+    const details = JSON.parse(detailsParam);
+    ok(
+      typeof details == "object",
+      "Details param is a stringified JSON object."
+    );
+    ok(Array.isArray(details.consoleLog), "Details has a consoleLog array.");
+
+    const log1 = details.consoleLog[0];
+    is(log1.log[0], null, "Can handle degenerate console logs");
+    is(log1.level, "log", "Reports correct log level");
+    is(log1.uri, URL, "Reports correct url");
+    is(log1.pos, "7:13", "Reports correct line and column");
+
+    const log2 = details.consoleLog[1];
+    is(log2.log[0], "colored message", "Can handle fancy console logs");
+    is(log2.level, "error", "Reports correct log level");
+    is(log2.uri, URL, "Reports correct url");
+    is(log2.pos, "8:13", "Reports correct line and column");
+
+    const log3 = details.consoleLog[2];
+    const loggedObject = log3.log[0];
+    is(loggedObject.testobj, "{...}", "Reports object inside object");
+    is(loggedObject.testSymbol, "Symbol(sym)", "Reports symbol inside object");
+    is(loggedObject.testnumber, 1, "Reports number inside object");
+    is(loggedObject.testArray, "(4)[...]", "Reports array inside object");
+    is(loggedObject.testUndf, "undefined", "Reports undefined inside object");
+    is(loggedObject.testNull, null, "Reports null inside object");
+    is(
+      loggedObject.testFunc,
+      undefined,
+      "Reports function inside object as undefined due to security reasons"
+    );
+    is(loggedObject.testString, "string", "Reports string inside object");
+    is(loggedObject.c, "{...}", "Reports circular reference inside object");
+    is(
+      Object.keys(loggedObject).length,
+      10,
+      "Preview has 10 keys inside object"
+    );
+    is(log3.level, "log", "Reports correct log level");
+    is(log3.uri, URL, "Reports correct url");
+    is(log3.pos, "24:13", "Reports correct line and column");
+
+    const log4 = details.consoleLog[3];
+    const loggedArray = log4.log[0];
+    is(loggedArray[0], "string", "Reports string inside array");
+    is(loggedArray[1], "{...}", "Reports object inside array");
+    is(loggedArray[2], null, "Reports null inside array");
+    is(loggedArray[3], 90, "Reports number inside array");
+    is(loggedArray[4], "undefined", "Reports undefined inside array");
+    is(
+      loggedArray[5],
+      "undefined",
+      "Reports function inside array as undefined due to security reasons"
+    );
+    is(loggedArray[6], "(4)[...]", "Reports array inside array");
+    is(loggedArray[7], "(8)[...]", "Reports circular array inside array");
+
+    const log5 = details.consoleLog[4];
+    ok(
+      log5.log[0].match(/TypeError: .*document\.access is undefined/),
+      "Script errors are logged"
+    );
+    is(log5.level, "error", "Reports correct log level");
+    is(log5.uri, URL, "Reports correct url");
+    is(log5.pos, "36:5", "Reports correct line and column");
+
+    ok(typeof details.buildID == "string", "Details has a buildID string.");
+    ok(typeof details.channel == "string", "Details has a channel string.");
+    ok(
+      typeof details.hasTouchScreen == "boolean",
+      "Details has a hasTouchScreen flag."
+    );
+    ok(
+      typeof details.hasFastClick == "undefined",
+      "Details does not have FastClick if not found."
+    );
+    ok(
+      typeof details.hasMobify == "undefined",
+      "Details does not have Mobify if not found."
+    );
+    ok(
+      typeof details.hasMarfeel == "undefined",
+      "Details does not have Marfeel if not found."
+    );
+    ok(
+      typeof details["mixed active content blocked"] == "boolean",
+      "Details has a mixed active content blocked flag."
+    );
+    ok(
+      typeof details["mixed passive content blocked"] == "boolean",
+      "Details has a mixed passive content blocked flag."
+    );
+    ok(
+      typeof details["tracking content blocked"] == "string",
+      "Details has a tracking content blocked string."
+    );
+    ok(
+      typeof details["gfx.webrender.all"] == "boolean",
+      "Details has gfx.webrender.all."
+    );
+    ok(
+      typeof details["gfx.webrender.blob-images"] == "boolean",
+      "Details has gfx.webrender.blob-images."
+    );
+    ok(
+      typeof details["gfx.webrender.enabled"] == "boolean",
+      "Details has gfx.webrender.enabled."
+    );
+    ok(
+      typeof details["image.mem.shared"] == "boolean",
+      "Details has image.mem.shared."
+    );
+
+    is(
+      preview.innerText,
+      "Pass",
+      "A Blob object was successfully transferred to the test page."
+    );
+
+    const bgUrl = preview.style.backgroundImage.match(/url\(\"(.*)\"\)/)[1];
+    ok(
+      bgUrl.startsWith("data:image/jpeg;base64,"),
+      "A jpeg screenshot was successfully postMessaged"
+    );
+    await isGreen(bgUrl);
+  });
+
+  BrowserTestUtils.removeTab(tab2);
+  BrowserTestUtils.removeTab(tab1);
+});
+
+add_task(async function test_framework_detection() {
+  let tab1 = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    FRAMEWORKS_TEST_PAGE
+  );
+  let tab2 = await clickToReportAndAwaitReportTabLoad();
+
+  await SpecialPowers.spawn(tab2.linkedBrowser, [], async function(args) {
+    let doc = content.document;
+    let detailsParam = doc.getElementById("details").innerText;
+    const details = JSON.parse(detailsParam);
+    ok(
+      typeof details == "object",
+      "Details param is a stringified JSON object."
+    );
+    is(details.hasFastClick, true, "FastClick was found.");
+    is(details.hasMobify, true, "Mobify was found.");
+    is(details.hasMarfeel, true, "Marfeel was found.");
+  });
+
+  BrowserTestUtils.removeTab(tab2);
+  BrowserTestUtils.removeTab(tab1);
+});
+
+add_task(async function test_fastclick_detection() {
+  let tab1 = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    FASTCLICK_TEST_PAGE
+  );
+  let tab2 = await clickToReportAndAwaitReportTabLoad();
+
+  await SpecialPowers.spawn(tab2.linkedBrowser, [], async function(args) {
+    let doc = content.document;
+    let detailsParam = doc.getElementById("details").innerText;
+    const details = JSON.parse(detailsParam);
+    ok(
+      typeof details == "object",
+      "Details param is a stringified JSON object."
+    );
+    is(details.hasFastClick, true, "FastClick was found.");
+  });
+
+  BrowserTestUtils.removeTab(tab2);
+  BrowserTestUtils.removeTab(tab1);
+});
+
+add_task(async function test_framework_label() {
+  let tab1 = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    FRAMEWORKS_TEST_PAGE
+  );
+  let tab2 = await clickToReportAndAwaitReportTabLoad();
+
+  await SpecialPowers.spawn(tab2.linkedBrowser, [], async function(args) {
+    let doc = content.document;
+    let labelParam = doc.getElementById("label").innerText;
+    const label = JSON.parse(labelParam);
+    ok(typeof label == "object", "Label param is a stringified JSON object.");
+    is(label.includes("type-fastclick"), true, "FastClick was found.");
+    is(label.includes("type-mobify"), true, "Mobify was found.");
+    is(label.includes("type-marfeel"), true, "Marfeel was found.");
+  });
+
+  BrowserTestUtils.removeTab(tab2);
+  BrowserTestUtils.removeTab(tab1);
+});
diff --git a/browser/extensions/report-site-issue/test/browser/fastclick.html b/browser/extensions/report-site-issue/test/browser/fastclick.html
new file mode 100644
index 0000000000..e13329dfd7
--- /dev/null
+++ b/browser/extensions/report-site-issue/test/browser/fastclick.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script>
+  "use strict";
+  function ObscuredFastClick() {
+  }
+  ObscuredFastClick.prototype = {
+    needsClick: () => {},
+  };
+  window.someRandomVar = new ObscuredFastClick();
+</script>
diff --git a/browser/extensions/report-site-issue/test/browser/frameworks.html b/browser/extensions/report-site-issue/test/browser/frameworks.html
new file mode 100644
index 0000000000..14df387ec9
--- /dev/null
+++ b/browser/extensions/report-site-issue/test/browser/frameworks.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script>
+  "use strict";
+  function FastClick() {}
+  function marfeel() {}
+  var Mobify = {Tag: "something"};
+</script>
diff --git a/browser/extensions/report-site-issue/test/browser/head.js b/browser/extensions/report-site-issue/test/browser/head.js
new file mode 100644
index 0000000000..da4545badc
--- /dev/null
+++ b/browser/extensions/report-site-issue/test/browser/head.js
@@ -0,0 +1,121 @@
+"use strict";
+
+ChromeUtils.defineModuleGetter(
+  this,
+  "AddonManager",
+  "resource://gre/modules/AddonManager.jsm"
+);
+
+const { Management } = ChromeUtils.import(
+  "resource://gre/modules/Extension.jsm"
+);
+
+const PREF_WC_REPORTER_ENABLED = "extensions.webcompat-reporter.enabled";
+const PREF_WC_REPORTER_ENDPOINT =
+  "extensions.webcompat-reporter.newIssueEndpoint";
+
+const TEST_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "http://example.com"
+);
+const TEST_PAGE = TEST_ROOT + "test.html";
+const FRAMEWORKS_TEST_PAGE = TEST_ROOT + "frameworks.html";
+const FASTCLICK_TEST_PAGE = TEST_ROOT + "fastclick.html";
+const NEW_ISSUE_PAGE = TEST_ROOT + "webcompat.html";
+
+const WC_ADDON_ID = "webcompat-reporter@mozilla.org";
+
+async function promiseAddonEnabled() {
+  const addon = await AddonManager.getAddonByID(WC_ADDON_ID);
+  if (addon.isActive) {
+    return;
+  }
+  const pref = SpecialPowers.Services.prefs.getBoolPref(
+    PREF_WC_REPORTER_ENABLED,
+    false
+  );
+  if (!pref) {
+    SpecialPowers.Services.prefs.setBoolPref(PREF_WC_REPORTER_ENABLED, true);
+  }
+}
+
+class HelpMenuHelper {
+  #popup = null;
+
+  async open() {
+    this.popup = document.getElementById("menu_HelpPopup");
+    ok(this.popup, "Help menu should exist");
+
+    const menuOpen = BrowserTestUtils.waitForEvent(this.popup, "popupshown");
+
+    // This event-faking method was copied from browser_title_case_menus.js so
+    // this can be tested on MacOS (where the actual menus cannot be opened in
+    // tests, but we only need the help menu to populate itself).
+    this.popup.dispatchEvent(new MouseEvent("popupshowing", { bubbles: true }));
+    this.popup.dispatchEvent(new MouseEvent("popupshown", { bubbles: true }));
+
+    await menuOpen;
+  }
+
+  async close() {
+    if (this.popup) {
+      const menuClose = BrowserTestUtils.waitForEvent(
+        this.popup,
+        "popuphidden"
+      );
+
+      // (Also copied from browser_title_case_menus.js)
+      // Just for good measure, we'll fire the popuphiding/popuphidden events
+      // after we close the menupopups.
+      this.popup.dispatchEvent(
+        new MouseEvent("popuphiding", { bubbles: true })
+      );
+      this.popup.dispatchEvent(
+        new MouseEvent("popuphidden", { bubbles: true })
+      );
+
+      await menuClose;
+      this.popup = null;
+    }
+  }
+
+  isItemHidden() {
+    const item = document.getElementById("help_reportSiteIssue");
+    return item && item.hidden;
+  }
+
+  isItemEnabled() {
+    const item = document.getElementById("help_reportSiteIssue");
+    return item && !item.hidden && !item.disabled;
+  }
+}
+
+async function startIssueServer() {
+  const landingTemplate = await new Promise((resolve, reject) => {
+    const xhr = new XMLHttpRequest();
+    xhr.open("GET", NEW_ISSUE_PAGE);
+    xhr.onload = () => {
+      resolve(xhr.responseText);
+    };
+    xhr.onerror = reject;
+    xhr.send();
+  });
+
+  const { HttpServer } = ChromeUtils.import(
+    "resource://testing-common/httpd.js"
+  );
+  const server = new HttpServer();
+
+  registerCleanupFunction(async function cleanup() {
+    await new Promise(resolve => server.stop(resolve));
+  });
+
+  server.registerPathHandler("/new", function(request, response) {
+    response.setHeader("Content-Type", "text/html", false);
+    response.setStatusLine(request.httpVersion, 200, "OK");
+    response.write(landingTemplate);
+  });
+
+  server.start(-1);
+  return `http://localhost:${server.identity.primaryPort}/new`;
+}
diff --git a/browser/extensions/report-site-issue/test/browser/test.html b/browser/extensions/report-site-issue/test/browser/test.html
new file mode 100644
index 0000000000..ed1844f530
--- /dev/null
+++ b/browser/extensions/report-site-issue/test/browser/test.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script>
+    /* eslint-disable no-console */
+    /* eslint-disable no-unused-expressions */
+    "use strict";
+    console.log(null);
+    console.error("%ccolored message", "background:green; color:white");
+    const obj = {
+        testSymbol: Symbol("sym"),
+        testobj: {},
+        testnumber: 1,
+        testArray: [1, {}, 2, 555],
+        testUndf: undefined,
+        testNull: null,
+        testFunc() {},
+        testString: 'string',
+        prop1: 'prop1',
+        prop2: 'prop2'
+    };
+    obj.c = obj;
+    obj.prop3 = 'prop3';
+    obj.prop4 = 'prop4';
+    console.log(obj);
+    const arr = [
+        'string',
+        {test: 'obj'},
+        null,
+        90,
+        undefined,
+        function() {},
+        [1, {}, 2, 555]
+    ];
+    arr.push(arr);
+    console.log(arr);
+    document.access.non.existent.property.to.trigger.error;
+</script>
+<style>
+  body {background: rgb(0, 128, 0);}
+</style>
diff --git a/browser/extensions/report-site-issue/test/browser/webcompat.html b/browser/extensions/report-site-issue/test/browser/webcompat.html
new file mode 100644
index 0000000000..872c8917b7
--- /dev/null
+++ b/browser/extensions/report-site-issue/test/browser/webcompat.html
@@ -0,0 +1,85 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<style>
+ #screenshot-preview {width: 200px; height: 200px;}
+</style>
+<div id="url">$$URL$$</div>
+<div id="details">$$DETAILS$$</div>
+<div id="label">$$LABEL$$</div>
+<div id="screenshot-preview">Fail</div>
+<script>
+"use strict";
+let preview = document.getElementById("screenshot-preview");
+const CONFIG = {
+  url: {
+    element: document.getElementById("url")
+  },
+  details: {
+    element: document.getElementById("details"),
+    toStringify: true
+  },
+  extra_labels: {
+    element: document.getElementById("label"),
+    toStringify: true
+  },
+};
+
+function getBlobAsDataURL(blob) {
+  return new Promise((resolve, reject) => {
+    let reader = new FileReader();
+
+    // eslint-disable-next-line mozilla/balanced-listeners
+    reader.addEventListener("error", (e) => {
+      reject(`There was an error reading the blob: ${e.type}`);
+    });
+
+    // eslint-disable-next-line mozilla/balanced-listeners
+    reader.addEventListener("load", (e) => {
+      resolve(e.target.result);
+    });
+
+    reader.readAsDataURL(blob);
+  });
+}
+
+function setPreviewBG(backgroundData) {
+  return new Promise((resolve) => {
+    preview.style.background = `url(${backgroundData})`;
+    resolve();
+  });
+}
+
+function sendReceivedEvent() {
+  window.dispatchEvent(new CustomEvent("ScreenshotReceived", {bubbles: true}));
+}
+
+function prepareContent(toStringify, content) {
+  if (toStringify) {
+    return JSON.stringify(content)
+  }
+
+  return content;
+}
+
+function appendMessage(message) {
+  for (const key in CONFIG) {
+    if (key in message) {
+      const field = CONFIG[key];
+      field.element.innerText = prepareContent(field.toStringify, message[key]);
+    }
+  }
+}
+
+// eslint-disable-next-line mozilla/balanced-listeners
+window.addEventListener("message", function(event) {
+  if (event.data.screenshot instanceof Blob) {
+    preview.innerText = "Pass";
+  }
+
+  if (event.data.message) {
+    appendMessage(event.data.message);
+  }
+
+  getBlobAsDataURL(event.data.screenshot).then(setPreviewBG).then(sendReceivedEvent);
+});
+</script>