1 files changed, 53 insertions, 0 deletions
diff --git a/comm/mail/base/content/profileDowngrade.js b/comm/mail/base/content/profileDowngrade.js
new file mode 100644
index 0000000000..3a9038e8e5
--- /dev/null
+++ b/comm/mail/base/content/profileDowngrade.js
@@ -0,0 +1,53 @@
+/* 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/. */
+
+let gParams;
+
+const { AppConstants } = ChromeUtils.importESModule(
+  "resource://gre/modules/AppConstants.sys.mjs"
+);
+
+window.addEventListener("load", event => {
+  init();
+});
+
+function init() {
+  /*
+   * The C++ code passes a dialog param block using its integers as in and out
+   * arguments for this UI. The following are the uses of the integers:
+   *
+   *  0: A set of flags from nsIToolkitProfileService.downgradeUIFlags.
+   *  1: A return argument, one of nsIToolkitProfileService.downgradeUIChoice.
+   */
+  gParams = window.arguments[0].QueryInterface(Ci.nsIDialogParamBlock);
+
+  document.addEventListener("dialogextra1", createProfile);
+  document.addEventListener("dialogaccept", quit);
+  document.addEventListener("dialogcancel", quit);
+
+  document.querySelector("dialog").getButton("accept").focus();
+}
+
+function quit() {
+  gParams.SetInt(1, Ci.nsIToolkitProfileService.quit);
+}
+
+function createProfile() {
+  gParams.SetInt(1, Ci.nsIToolkitProfileService.createNewProfile);
+  window.close();
+}
+
+function moreInfo(event) {
+  if (event.type == "keypress" && event.key != "Enter") {
+    return;
+  }
+  event.preventDefault();
+
+  let uri = Services.io.newURI(
+    "https://support.mozilla.org/kb/unable-launch-older-version-profile"
+  );
+  Cc["@mozilla.org/uriloader/external-protocol-service;1"]
+    .getService(Ci.nsIExternalProtocolService)
+    .loadURI(uri);
+}