Adding upstream version 110.0.1.upstream/110.0.1upstream

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

8 files changed, 892 insertions, 0 deletions

diff --git a/browser/extensions/screenshots/background/analytics.js b/browser/extensions/screenshots/background/analytics.js
new file mode 100644
index 0000000000..612a2be9ca
--- /dev/null
+++ b/browser/extensions/screenshots/background/analytics.js
@@ -0,0 +1,55 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* globals main, browser, catcher, log */
+
+"use strict";
+
+this.analytics = (function() {
+  const exports = {};
+
+  let telemetryEnabled;
+
+  exports.incrementCount = function(scalar) {
+    const allowedScalars = [
+      "download",
+      "upload",
+      "copy",
+      "visible",
+      "full_page",
+      "custom",
+      "element",
+    ];
+    if (!allowedScalars.includes(scalar)) {
+      const err = `incrementCount passed an unrecognized scalar ${scalar}`;
+      log.warn(err);
+      return Promise.resolve();
+    }
+    return browser.telemetry
+      .scalarAdd(`screenshots.${scalar}`, 1)
+      .catch(err => {
+        log.warn(`incrementCount failed with error: ${err}`);
+      });
+  };
+
+  exports.refreshTelemetryPref = function() {
+    return browser.telemetry.canUpload().then(
+      result => {
+        telemetryEnabled = result;
+      },
+      error => {
+        // If there's an error reading the pref, we should assume that we shouldn't send data
+        telemetryEnabled = false;
+        throw error;
+      }
+    );
+  };
+
+  exports.isTelemetryEnabled = function() {
+    catcher.watchPromise(exports.refreshTelemetryPref());
+    return telemetryEnabled;
+  };
+
+  return exports;
+})();
diff --git a/browser/extensions/screenshots/background/communication.js b/browser/extensions/screenshots/background/communication.js
new file mode 100644
index 0000000000..de054e0d55
--- /dev/null
+++ b/browser/extensions/screenshots/background/communication.js
@@ -0,0 +1,69 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* globals catcher, log */
+
+"use strict";
+
+this.communication = (function() {
+  const exports = {};
+
+  const registeredFunctions = {};
+
+  exports.onMessage = catcher.watchFunction((req, sender, sendResponse) => {
+    if (!(req.funcName in registeredFunctions)) {
+      log.error(`Received unknown internal message type ${req.funcName}`);
+      sendResponse({ type: "error", name: "Unknown message type" });
+      return;
+    }
+    if (!Array.isArray(req.args)) {
+      log.error("Received message with no .args list");
+      sendResponse({ type: "error", name: "No .args" });
+      return;
+    }
+    const func = registeredFunctions[req.funcName];
+    let result;
+    try {
+      req.args.unshift(sender);
+      result = func.apply(null, req.args);
+    } catch (e) {
+      log.error(`Error in ${req.funcName}:`, e, e.stack);
+      // FIXME: should consider using makeError from catcher here:
+      sendResponse({
+        type: "error",
+        message: e + "",
+        errorCode: e.errorCode,
+        popupMessage: e.popupMessage,
+      });
+      return;
+    }
+    if (result && result.then) {
+      result
+        .then(concreteResult => {
+          sendResponse({ type: "success", value: concreteResult });
+        })
+        .catch(errorResult => {
+          log.error(
+            `Promise error in ${req.funcName}:`,
+            errorResult,
+            errorResult && errorResult.stack
+          );
+          sendResponse({
+            type: "error",
+            message: errorResult + "",
+            errorCode: errorResult.errorCode,
+            popupMessage: errorResult.popupMessage,
+          });
+        });
+      return;
+    }
+    sendResponse({ type: "success", value: result });
+  });
+
+  exports.register = function(name, func) {
+    registeredFunctions[name] = func;
+  };
+
+  return exports;
+})();
diff --git a/browser/extensions/screenshots/background/deviceInfo.js b/browser/extensions/screenshots/background/deviceInfo.js
new file mode 100644
index 0000000000..062c4928d8
--- /dev/null
+++ b/browser/extensions/screenshots/background/deviceInfo.js
@@ -0,0 +1,39 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* globals catcher, browser, navigator */
+
+"use strict";
+
+this.deviceInfo = (function() {
+  const manifest = browser.runtime.getManifest();
+
+  let platformInfo = {};
+  catcher.watchPromise(
+    browser.runtime.getPlatformInfo().then(info => {
+      platformInfo = info;
+    })
+  );
+
+  return function deviceInfo() {
+    let match = navigator.userAgent.match(/Chrom(?:e|ium)\/([0-9.]{1,1000})/);
+    const chromeVersion = match ? match[1] : null;
+    match = navigator.userAgent.match(/Firefox\/([0-9.]{1,1000})/);
+    const firefoxVersion = match ? match[1] : null;
+    const appName = chromeVersion ? "chrome" : "firefox";
+
+    return {
+      addonVersion: manifest.version,
+      platform: platformInfo.os,
+      architecture: platformInfo.arch,
+      version: firefoxVersion || chromeVersion,
+      // These don't seem to apply to Chrome:
+      // build: system.build,
+      // platformVersion: system.platformVersion,
+      userAgent: navigator.userAgent,
+      appVendor: appName,
+      appName,
+    };
+  };
+})();
diff --git a/browser/extensions/screenshots/background/main.js b/browser/extensions/screenshots/background/main.js
new file mode 100644
index 0000000000..e5c82a048a
--- /dev/null
+++ b/browser/extensions/screenshots/background/main.js
@@ -0,0 +1,238 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* globals browser, getStrings, selectorLoader, analytics, communication, catcher, log, senderror, startBackground, blobConverters, startSelectionWithOnboarding */
+
+"use strict";
+
+this.main = (function() {
+  const exports = {};
+
+  const { incrementCount } = analytics;
+
+  const manifest = browser.runtime.getManifest();
+  let backend;
+
+  exports.setBackend = function(newBackend) {
+    backend = newBackend;
+    backend = backend.replace(/\/*$/, "");
+  };
+
+  exports.getBackend = function() {
+    return backend;
+  };
+
+  communication.register("getBackend", () => {
+    return backend;
+  });
+
+  for (const permission of manifest.permissions) {
+    if (/^https?:\/\//.test(permission)) {
+      exports.setBackend(permission);
+      break;
+    }
+  }
+
+  function toggleSelector(tab) {
+    return analytics
+      .refreshTelemetryPref()
+      .then(() => selectorLoader.toggle(tab.id))
+      .catch(error => {
+        if (
+          error.message &&
+          /Missing host permission for the tab/.test(error.message)
+        ) {
+          error.noReport = true;
+        }
+        error.popupMessage = "UNSHOOTABLE_PAGE";
+        throw error;
+      });
+  }
+
+  // This is called by startBackground.js, where is registered as a click
+  // handler for the webextension page action.
+  exports.onClicked = catcher.watchFunction(tab => {
+    _startShotFlow(tab, "toolbar-button");
+  });
+
+  exports.onClickedContextMenu = catcher.watchFunction(tab => {
+    _startShotFlow(tab, "context-menu");
+  });
+
+  exports.onShortcut = catcher.watchFunction(tab => {
+    _startShotFlow(tab, "keyboard-shortcut");
+  });
+
+  const _startShotFlow = (tab, inputType) => {
+    if (!tab) {
+      // Not in a page/tab context, ignore
+      return;
+    }
+    if (!urlEnabled(tab.url)) {
+      senderror.showError({
+        popupMessage: "UNSHOOTABLE_PAGE",
+      });
+      return;
+    }
+
+    catcher.watchPromise(
+      toggleSelector(tab).catch(error => {
+        throw error;
+      })
+    );
+  };
+
+  function urlEnabled(url) {
+    // Allow screenshots on urls related to web pages in reader mode.
+    if (url && url.startsWith("about:reader?url=")) {
+      return true;
+    }
+    if (
+      isShotOrMyShotPage(url) ||
+      /^(?:about|data|moz-extension):/i.test(url) ||
+      isBlacklistedUrl(url)
+    ) {
+      return false;
+    }
+    return true;
+  }
+
+  function isShotOrMyShotPage(url) {
+    // It's okay to take a shot of any pages except shot pages and My Shots
+    if (!url.startsWith(backend)) {
+      return false;
+    }
+    const path = url
+      .substr(backend.length)
+      .replace(/^\/*/, "")
+      .replace(/[?#].*/, "");
+    if (path === "shots") {
+      return true;
+    }
+    if (/^[^/]{1,4000}\/[^/]{1,4000}$/.test(path)) {
+      // Blocks {:id}/{:domain}, but not /, /privacy, etc
+      return true;
+    }
+    return false;
+  }
+
+  function isBlacklistedUrl(url) {
+    // These specific domains are not allowed for general WebExtension permission reasons
+    // Discussion: https://bugzilla.mozilla.org/show_bug.cgi?id=1310082
+    // List of domains copied from: https://searchfox.org/mozilla-central/source/browser/app/permissions#18-19
+    // Note we disable it here to be informative, the security check is done in WebExtension code
+    const badDomains = ["testpilot.firefox.com"];
+    let domain = url.replace(/^https?:\/\//i, "");
+    domain = domain.replace(/\/.*/, "").replace(/:.*/, "");
+    domain = domain.toLowerCase();
+    return badDomains.includes(domain);
+  }
+
+  communication.register("getStrings", (sender, ids) => {
+    return getStrings(ids.map(id => ({ id })));
+  });
+
+  communication.register("captureTelemetry", (sender, ...args) => {
+    catcher.watchPromise(incrementCount(...args));
+  });
+
+  communication.register("openShot", async (sender, { url, copied }) => {
+    if (copied) {
+      const id = crypto.randomUUID();
+      const [title, message] = await getStrings([
+        { id: "screenshots-notification-link-copied-title" },
+        { id: "screenshots-notification-link-copied-details" },
+      ]);
+      return browser.notifications.create(id, {
+        type: "basic",
+        iconUrl: "chrome://browser/content/screenshots/copied-notification.svg",
+        title,
+        message,
+      });
+    }
+    return null;
+  });
+
+  communication.register("copyShotToClipboard", async (sender, blob) => {
+    let buffer = await blobConverters.blobToArray(blob);
+    await browser.clipboard.setImageData(buffer, blob.type.split("/", 2)[1]);
+
+    const [title, message] = await getStrings([
+      { id: "screenshots-notification-image-copied-title" },
+      { id: "screenshots-notification-image-copied-details" },
+    ]);
+
+    catcher.watchPromise(incrementCount("copy"));
+    return browser.notifications.create({
+      type: "basic",
+      iconUrl: "chrome://browser/content/screenshots/copied-notification.svg",
+      title,
+      message,
+    });
+  });
+
+  communication.register("downloadShot", (sender, info) => {
+    // 'data:' urls don't work directly, let's use a Blob
+    // see http://stackoverflow.com/questions/40269862/save-data-uri-as-file-using-downloads-download-api
+    const blob = blobConverters.dataUrlToBlob(info.url);
+    const url = URL.createObjectURL(blob);
+    let downloadId;
+    const onChangedCallback = catcher.watchFunction(function(change) {
+      if (!downloadId || downloadId !== change.id) {
+        return;
+      }
+      if (change.state && change.state.current !== "in_progress") {
+        URL.revokeObjectURL(url);
+        browser.downloads.onChanged.removeListener(onChangedCallback);
+      }
+    });
+    browser.downloads.onChanged.addListener(onChangedCallback);
+    catcher.watchPromise(incrementCount("download"));
+    return browser.windows.getLastFocused().then(windowInfo => {
+      return browser.downloads
+        .download({
+          url,
+          incognito: windowInfo.incognito,
+          filename: info.filename,
+        })
+        .catch(error => {
+          // We are not logging error message when user cancels download
+          if (error && error.message && !error.message.includes("canceled")) {
+            log.error(error.message);
+          }
+        })
+        .then(id => {
+          downloadId = id;
+        });
+    });
+  });
+
+  communication.register("abortStartShot", () => {
+    // Note, we only show the error but don't report it, as we know that we can't
+    // take shots of these pages:
+    senderror.showError({
+      popupMessage: "UNSHOOTABLE_PAGE",
+    });
+  });
+
+  // A Screenshots page wants us to start/force onboarding
+  communication.register("requestOnboarding", sender => {
+    return startSelectionWithOnboarding(sender.tab);
+  });
+
+  communication.register("getPlatformOs", () => {
+    return catcher.watchPromise(
+      browser.runtime.getPlatformInfo().then(platformInfo => {
+        return platformInfo.os;
+      })
+    );
+  });
+
+  // This allows the web site show notifications through sitehelper.js
+  communication.register("showNotification", (sender, notification) => {
+    return browser.notifications.create(notification);
+  });
+
+  return exports;
+})();
diff --git a/browser/extensions/screenshots/background/selectorLoader.js b/browser/extensions/screenshots/background/selectorLoader.js
new file mode 100644
index 0000000000..347b29deb8
--- /dev/null
+++ b/browser/extensions/screenshots/background/selectorLoader.js
@@ -0,0 +1,139 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* globals browser, catcher, communication, log, main */
+
+"use strict";
+
+// eslint-disable-next-line no-var
+var global = this;
+
+this.selectorLoader = (function() {
+  const exports = {};
+
+  // These modules are loaded in order, first standardScripts and then selectorScripts
+  // The order is important due to dependencies
+  const standardScripts = [
+    "log.js",
+    "catcher.js",
+    "assertIsTrusted.js",
+    "assertIsBlankDocument.js",
+    "blobConverters.js",
+    "background/selectorLoader.js",
+    "selector/callBackground.js",
+    "selector/util.js",
+  ];
+
+  const selectorScripts = [
+    "clipboard.js",
+    "build/selection.js",
+    "build/shot.js",
+    "randomString.js",
+    "domainFromUrl.js",
+    "build/inlineSelectionCss.js",
+    "selector/documentMetadata.js",
+    "selector/ui.js",
+    "selector/shooter.js",
+    "selector/uicontrol.js",
+  ];
+
+  exports.unloadIfLoaded = function(tabId) {
+    return browser.tabs
+      .executeScript(tabId, {
+        code: "this.selectorLoader && this.selectorLoader.unloadModules()",
+        runAt: "document_start",
+      })
+      .then(result => {
+        return result && result[0];
+      });
+  };
+
+  exports.testIfLoaded = function(tabId) {
+    if (loadingTabs.has(tabId)) {
+      return true;
+    }
+    return browser.tabs
+      .executeScript(tabId, {
+        code: "!!this.selectorLoader",
+        runAt: "document_start",
+      })
+      .then(result => {
+        return result && result[0];
+      });
+  };
+
+  const loadingTabs = new Set();
+
+  exports.loadModules = function(tabId) {
+    loadingTabs.add(tabId);
+    catcher.watchPromise(
+      executeModules(tabId, standardScripts.concat(selectorScripts)).then(
+        () => {
+          loadingTabs.delete(tabId);
+        }
+      )
+    );
+  };
+
+  function executeModules(tabId, scripts) {
+    let lastPromise = Promise.resolve(null);
+    scripts.forEach(file => {
+      lastPromise = lastPromise.then(() => {
+        return browser.tabs
+          .executeScript(tabId, {
+            file,
+            runAt: "document_start",
+          })
+          .catch(error => {
+            log.error("error in script:", file, error);
+            error.scriptName = file;
+            throw error;
+          });
+      });
+    });
+    return lastPromise.then(
+      () => {
+        log.debug("finished loading scripts:", scripts.join(" "));
+      },
+      error => {
+        exports.unloadIfLoaded(tabId);
+        catcher.unhandled(error);
+        throw error;
+      }
+    );
+  }
+
+  exports.unloadModules = function() {
+    const watchFunction = catcher.watchFunction;
+    const allScripts = standardScripts.concat(selectorScripts);
+    const moduleNames = allScripts.map(filename =>
+      filename.replace(/^.*\//, "").replace(/\.js$/, "")
+    );
+    moduleNames.reverse();
+    for (const moduleName of moduleNames) {
+      const moduleObj = global[moduleName];
+      if (moduleObj && moduleObj.unload) {
+        try {
+          watchFunction(moduleObj.unload)();
+        } catch (e) {
+          // ignore (watchFunction handles it)
+        }
+      }
+      delete global[moduleName];
+    }
+    return true;
+  };
+
+  exports.toggle = function(tabId) {
+    return exports.unloadIfLoaded(tabId).then(wasLoaded => {
+      if (!wasLoaded) {
+        exports.loadModules(tabId);
+      }
+      return !wasLoaded;
+    });
+  };
+
+  return exports;
+})();
+null;
diff --git a/browser/extensions/screenshots/background/senderror.js b/browser/extensions/screenshots/background/senderror.js
new file mode 100644
index 0000000000..cad0fc52ce
--- /dev/null
+++ b/browser/extensions/screenshots/background/senderror.js
@@ -0,0 +1,144 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* globals startBackground, analytics, communication, catcher, log, browser, getStrings */
+
+"use strict";
+
+this.senderror = (function() {
+  const exports = {};
+
+  // Do not show an error more than every ERROR_TIME_LIMIT milliseconds:
+  const ERROR_TIME_LIMIT = 3000;
+
+  const messages = {
+    REQUEST_ERROR: {
+      titleKey: "screenshots-request-error-title",
+      infoKey: "screenshots-request-error-details",
+    },
+    CONNECTION_ERROR: {
+      titleKey: "screenshots-connection-error-title",
+      infoKey: "screenshots-connection-error-details",
+    },
+    LOGIN_ERROR: {
+      titleKey: "screenshots-request-error-title",
+      infoKey: "screenshots-login-error-details",
+    },
+    LOGIN_CONNECTION_ERROR: {
+      titleKey: "screenshots-connection-error-title",
+      infoKey: "screenshots-connection-error-details",
+    },
+    UNSHOOTABLE_PAGE: {
+      titleKey: "screenshots-unshootable-page-error-title",
+      infoKey: "screenshots-unshootable-page-error-details",
+    },
+    EMPTY_SELECTION: {
+      titleKey: "screenshots-empty-selection-error-title",
+    },
+    PRIVATE_WINDOW: {
+      titleKey: "screenshots-private-window-error-title",
+      infoKey: "screenshots-private-window-error-details",
+    },
+    generic: {
+      titleKey: "screenshots-generic-error-title",
+      infoKey: "screenshots-generic-error-details",
+      showMessage: true,
+    },
+  };
+
+  communication.register("reportError", (sender, error) => {
+    catcher.unhandled(error);
+  });
+
+  let lastErrorTime;
+
+  exports.showError = async function(error) {
+    if (lastErrorTime && Date.now() - lastErrorTime < ERROR_TIME_LIMIT) {
+      return;
+    }
+    lastErrorTime = Date.now();
+    const id = crypto.randomUUID();
+    let popupMessage = error.popupMessage || "generic";
+    if (!messages[popupMessage]) {
+      popupMessage = "generic";
+    }
+
+    let item = messages[popupMessage];
+    if (!("title" in item)) {
+      let keys = [{ id: item.titleKey }];
+      if ("infoKey" in item) {
+        keys.push({ id: item.infoKey });
+      }
+
+      [item.title, item.info] = await getStrings(keys);
+    }
+
+    let title = item.title;
+    let message = item.info || "";
+    const showMessage = item.showMessage;
+    if (error.message && showMessage) {
+      if (message) {
+        message += "\n" + error.message;
+      } else {
+        message = error.message;
+      }
+    }
+    if (Date.now() - startBackground.startTime > 5 * 1000) {
+      browser.notifications.create(id, {
+        type: "basic",
+        // FIXME: need iconUrl for an image, see #2239
+        title,
+        message,
+      });
+    }
+  };
+
+  exports.reportError = function(e) {
+    if (!analytics.isTelemetryEnabled()) {
+      log.error("Telemetry disabled. Not sending critical error:", e);
+      return;
+    }
+    const exception = new Error(e.message);
+    exception.stack = e.multilineStack || e.stack || undefined;
+
+    // To improve Sentry reporting & grouping, replace the
+    // moz-extension://$uuid base URL with a generic resource:// URL.
+    if (exception.stack) {
+      exception.stack = exception.stack.replace(
+        /moz-extension:\/\/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/g,
+        "resource://screenshots-addon"
+      );
+    }
+    const rest = {};
+    for (const attr in e) {
+      if (
+        ![
+          "name",
+          "message",
+          "stack",
+          "multilineStack",
+          "popupMessage",
+          "version",
+          "sentryPublicDSN",
+          "help",
+          "fromMakeError",
+        ].includes(attr)
+      ) {
+        rest[attr] = e[attr];
+      }
+    }
+    rest.stack = exception.stack;
+  };
+
+  catcher.registerHandler(errorObj => {
+    if (!errorObj.noPopup) {
+      exports.showError(errorObj);
+    }
+    if (!errorObj.noReport) {
+      exports.reportError(errorObj);
+    }
+  });
+
+  return exports;
+})();
diff --git a/browser/extensions/screenshots/background/startBackground.js b/browser/extensions/screenshots/background/startBackground.js
new file mode 100644
index 0000000000..afb2d0eb65
--- /dev/null
+++ b/browser/extensions/screenshots/background/startBackground.js
@@ -0,0 +1,123 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* globals browser, main, communication, manifest */
+
+/* This file handles:
+     clicks on the WebExtension page action
+     browser.contextMenus.onClicked
+     browser.runtime.onMessage
+   and loads the rest of the background page in response to those events, forwarding
+   the events to main.onClicked, main.onClickedContextMenu, or communication.onMessage
+*/
+
+const startTime = Date.now();
+
+// Set up to be able to use fluent:
+(function() {
+  let link = document.createElement("link");
+  link.setAttribute("rel", "localization");
+  link.setAttribute("href", "browser/screenshots.ftl");
+  document.head.appendChild(link);
+
+  link = document.createElement("link");
+  link.setAttribute("rel", "localization");
+  link.setAttribute("href", "browser/branding/brandings.ftl");
+  document.head.appendChild(link);
+})();
+
+this.getStrings = async function(ids) {
+  if (document.readyState != "complete") {
+    await new Promise(resolve =>
+      window.addEventListener("load", resolve, { once: true })
+    );
+  }
+  await document.l10n.ready;
+  return document.l10n.formatValues(ids);
+};
+
+let zoomFactor = 1;
+this.getZoomFactor = function() {
+  return zoomFactor;
+};
+
+this.startBackground = (function() {
+  const exports = { startTime };
+
+  const backgroundScripts = [
+    "log.js",
+    "catcher.js",
+    "blobConverters.js",
+    "background/selectorLoader.js",
+    "background/communication.js",
+    "background/senderror.js",
+    "build/shot.js",
+    "build/thumbnailGenerator.js",
+    "background/analytics.js",
+    "background/deviceInfo.js",
+    "background/takeshot.js",
+    "background/main.js",
+  ];
+
+  browser.experiments.screenshots.onScreenshotCommand.addListener(
+    async type => {
+      try {
+        let [[tab]] = await Promise.all([
+          browser.tabs.query({ currentWindow: true, active: true }),
+          loadIfNecessary(),
+        ]);
+        zoomFactor = await browser.tabs.getZoom(tab.id);
+        if (type === "contextMenu") {
+          main.onClickedContextMenu(tab);
+        } else if (type === "toolbar") {
+          main.onClicked(tab);
+        } else if (type === "shortcut") {
+          main.onShortcut(tab);
+        }
+      } catch (error) {
+        console.error("Error loading Screenshots:", error);
+      }
+    }
+  );
+
+  browser.runtime.onMessage.addListener((req, sender, sendResponse) => {
+    loadIfNecessary()
+      .then(() => {
+        return communication.onMessage(req, sender, sendResponse);
+      })
+      .catch(error => {
+        console.error("Error loading Screenshots:", error);
+      });
+    return true;
+  });
+
+  let loadedPromise;
+
+  function loadIfNecessary() {
+    if (loadedPromise) {
+      return loadedPromise;
+    }
+    loadedPromise = Promise.resolve();
+    backgroundScripts.forEach(script => {
+      loadedPromise = loadedPromise.then(() => {
+        return new Promise((resolve, reject) => {
+          const tag = document.createElement("script");
+          tag.src = browser.runtime.getURL(script);
+          tag.onload = () => {
+            resolve();
+          };
+          tag.onerror = error => {
+            const exc = new Error(`Error loading script: ${error.message}`);
+            exc.scriptName = script;
+            reject(exc);
+          };
+          document.head.appendChild(tag);
+        });
+      });
+    });
+    return loadedPromise;
+  }
+
+  return exports;
+})();
diff --git a/browser/extensions/screenshots/background/takeshot.js b/browser/extensions/screenshots/background/takeshot.js
new file mode 100644
index 0000000000..6a5355f026
--- /dev/null
+++ b/browser/extensions/screenshots/background/takeshot.js
@@ -0,0 +1,85 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* globals browser, communication, getZoomFactor, shot, main, catcher, analytics, blobConverters, thumbnailGenerator */
+
+"use strict";
+
+this.takeshot = (function() {
+  const exports = {};
+  const MAX_CANVAS_DIMENSION = 32767;
+
+  communication.register(
+    "screenshotPage",
+    (sender, selectedPos, screenshotType, devicePixelRatio) => {
+      return screenshotPage(selectedPos, screenshotType, devicePixelRatio);
+    }
+  );
+
+  communication.register("getZoomFactor", sender => {
+    return getZoomFactor();
+  });
+
+  function screenshotPage(pos, screenshotType, devicePixelRatio) {
+    pos.width = Math.min(pos.right - pos.left, MAX_CANVAS_DIMENSION);
+    pos.height = Math.min(pos.bottom - pos.top, MAX_CANVAS_DIMENSION);
+
+    // If we are printing the full page or a truncated full page,
+    // we must pass in this rectangle to preview the entire image
+    let options = { format: "png" };
+    if (
+      screenshotType === "fullPage" ||
+      screenshotType === "fullPageTruncated"
+    ) {
+      let rectangle = {
+        x: 0,
+        y: 0,
+        width: pos.width,
+        height: pos.height,
+      };
+      options.rect = rectangle;
+      options.resetScrollPosition = true;
+    } else if (screenshotType != "visible") {
+      let rectangle = {
+        x: pos.left,
+        y: pos.top,
+        width: pos.width,
+        height: pos.height,
+      };
+      options.rect = rectangle;
+    }
+
+    return catcher.watchPromise(
+      browser.tabs.captureTab(null, options).then(dataUrl => {
+        const image = new Image();
+        image.src = dataUrl;
+        return new Promise((resolve, reject) => {
+          image.onload = catcher.watchFunction(() => {
+            const xScale = devicePixelRatio;
+            const yScale = devicePixelRatio;
+            const canvas = document.createElement("canvas");
+            canvas.height = pos.height * yScale;
+            canvas.width = pos.width * xScale;
+            const context = canvas.getContext("2d");
+            context.drawImage(
+              image,
+              0,
+              0,
+              pos.width * xScale,
+              pos.height * yScale,
+              0,
+              0,
+              pos.width * xScale,
+              pos.height * yScale
+            );
+            const result = canvas.toDataURL();
+            resolve(result);
+          });
+        });
+      })
+    );
+  }
+
+  return exports;
+})();