Adding upstream version 86.0.1.upstream/86.0.1upstream

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

1 files changed, 1798 insertions, 0 deletions

diff --git a/toolkit/components/prompts/src/Prompter.jsm b/toolkit/components/prompts/src/Prompter.jsm
new file mode 100644
index 0000000000..68f061f62d
--- /dev/null
+++ b/toolkit/components/prompts/src/Prompter.jsm
@@ -0,0 +1,1798 @@
+/* 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/. */
+
+"use strict";
+
+const { XPCOMUtils } = ChromeUtils.import(
+  "resource://gre/modules/XPCOMUtils.jsm"
+);
+const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
+const { objectToPropBag } = ChromeUtils.import(
+  "resource://gre/modules/BrowserUtils.jsm"
+).BrowserUtils;
+// This is redefined below, for strange and unfortunate reasons.
+var { PromptUtils } = ChromeUtils.import(
+  "resource://gre/modules/SharedPromptUtils.jsm"
+);
+
+function Prompter() {
+  // Note that EmbedPrompter clones this implementation.
+}
+
+/**
+ * Implements nsIPromptService and nsIPromptFactory
+ * @class Prompter
+ */
+Prompter.prototype = {
+  classID: Components.ID("{1c978d25-b37f-43a8-a2d6-0c7a239ead87}"),
+  QueryInterface: ChromeUtils.generateQI([
+    "nsIPromptFactory",
+    "nsIPromptService",
+  ]),
+
+  /* ----------  private members  ---------- */
+
+  pickPrompter(options) {
+    return new ModalPrompter(options);
+  },
+
+  /* ----------  nsIPromptFactory  ---------- */
+
+  getPrompt(domWin, iid) {
+    // This is still kind of dumb; the C++ code delegated to login manager
+    // here, which in turn calls back into us via nsIPromptService.
+    if (iid.equals(Ci.nsIAuthPrompt2) || iid.equals(Ci.nsIAuthPrompt)) {
+      try {
+        let pwmgr = Cc[
+          "@mozilla.org/passwordmanager/authpromptfactory;1"
+        ].getService(Ci.nsIPromptFactory);
+        return pwmgr.getPrompt(domWin, iid);
+      } catch (e) {
+        Cu.reportError(
+          "nsPrompter: Delegation to password manager failed: " + e
+        );
+      }
+    }
+
+    let p = new ModalPrompter({ domWin });
+    p.QueryInterface(iid);
+    return p;
+  },
+
+  /* ----------  nsIPromptService  ---------- */
+
+  /**
+   * Puts up an alert dialog with an OK button.
+   * @param {mozIDOMWindowProxy} domWin - The parent window or null.
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   */
+  alert(domWin, title, text) {
+    let p = this.pickPrompter({ domWin });
+    p.alert(title, text);
+  },
+
+  /**
+   * Puts up an alert dialog with an OK button.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   */
+  alertBC(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType });
+    p.alert(...promptArgs);
+  },
+
+  /**
+   * Puts up an alert dialog with an OK button.
+   *
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @returns {Promise} A promise which resolves when the prompt is dismissed.
+   */
+  asyncAlert(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType, async: true });
+    return p.alert(...promptArgs);
+  },
+
+  /**
+   * Puts up an alert dialog with an OK button and a labeled checkbox.
+   * @param {mozIDOMWindowProxy} domWin - The parent window or null.
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method is called and the final checked state
+   *        after this method returns.
+   */
+  alertCheck(domWin, title, text, checkLabel, checkValue) {
+    let p = this.pickPrompter({ domWin });
+    p.alertCheck(title, text, checkLabel, checkValue);
+  },
+
+  /**
+   * Puts up an alert dialog with an OK button and a labeled checkbox.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method is called and the final checked state
+   *        after this method returns.
+   */
+  alertCheckBC(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType });
+    p.alertCheck(...promptArgs);
+  },
+
+  /**
+   * Puts up an alert dialog with an OK button and a labeled checkbox.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   * @param {Boolean} checkValue - The initial checked state of the checkbox.
+   * @returns {Promise<nsIPropertyBag<{ checked: Boolean }>>}
+   *          A promise which resolves when the prompt is dismissed.
+   */
+  asyncAlertCheck(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType, async: true });
+    return p.alertCheck(...promptArgs);
+  },
+
+  /**
+   * Puts up a dialog with OK and Cancel buttons.
+   * @param {mozIDOMWindowProxy} domWin - The parent window or null.
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @returns {Boolean} true for OK, false for Cancel.
+   */
+  confirm(domWin, title, text) {
+    let p = this.pickPrompter({ domWin });
+    return p.confirm(title, text);
+  },
+
+  /**
+   * Puts up a dialog with OK and Cancel buttons.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @returns {Boolean} true for OK, false for Cancel.
+   */
+  confirmBC(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType });
+    return p.confirm(...promptArgs);
+  },
+
+  /**
+   * Puts up a dialog with OK and Cancel buttons.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @returns {Promise<nsIPropertyBag<{ ok: Boolean }>>}
+   *          A promise which resolves when the prompt is dismissed.
+   */
+  asyncConfirm(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType, async: true });
+    return p.confirm(...promptArgs);
+  },
+
+  /**
+   * Puts up a dialog with OK and Cancel buttons and a labeled checkbox.
+   * @param {mozIDOMWindowProxy} domWin - The parent window or null.
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method is called and the final checked state
+   *        after this method returns.
+   */
+  confirmCheck(domWin, title, text, checkLabel, checkValue) {
+    let p = this.pickPrompter({ domWin });
+    return p.confirmCheck(title, text, checkLabel, checkValue);
+  },
+
+  /**
+   * Puts up a dialog with OK and Cancel buttons and a labeled checkbox.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method is called and the final checked state
+   *        after this method returns.
+   * @returns {Boolean} true for OK, false for Cancel
+   */
+  confirmCheckBC(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType });
+    return p.confirmCheck(...promptArgs);
+  },
+
+  /**
+   * Puts up a dialog with OK and Cancel buttons and a labeled checkbox.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   * @param {Boolean} checkValue - The initial checked state of the checkbox.
+   * @returns {Promise<nsIPropertyBag<{ ok: Boolean, checked: Boolean }>>}
+   *          A promise which resolves when the prompt is dismissed.
+   */
+  asyncConfirmCheck(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType, async: true });
+    return p.confirmCheck(...promptArgs);
+  },
+
+  /**
+   * Puts up a dialog with up to 3 buttons and an optional, labeled checkbox.
+   *
+   * Buttons are numbered 0 - 2. Button 0 is the default button unless one of
+   * the Button Default Flags is specified.
+   *
+   * A button may use a predefined title, specified by one of the Button Title
+   * Flags values.  Each title value can be multiplied by a position value to
+   * assign the title to a particular button.  If BUTTON_TITLE_IS_STRING is
+   * used for a button, the string parameter for that button will be used.  If
+   * the value for a button position is zero, the button will not be shown.
+   *
+   * In general, flags is constructed per the following example:
+   *
+   * flags = (BUTTON_POS_0) * (BUTTON_TITLE_AAA) +
+   *         (BUTTON_POS_1) * (BUTTON_TITLE_BBB) +
+   *         BUTTON_POS_1_DEFAULT;
+   *
+   * where "AAA" and "BBB" correspond to one of the button titles.
+   *
+   * @param {mozIDOMWindowProxy} domWin - The parent window or null.
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {Number} flags - A combination of Button Flags.
+   * @param {String} button0 - Used when button 0 uses TITLE_IS_STRING.
+   * @param {String} button1 - Used when button 1 uses TITLE_IS_STRING.
+   * @param {String} button2 - Used when button 2 uses TITLE_IS_STRING.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        Null if no checkbox.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method
+   *        is called and the final checked state after this method returns.
+   * @returns {Number} The index of the button pressed.
+   */
+  confirmEx(
+    domWin,
+    title,
+    text,
+    flags,
+    button0,
+    button1,
+    button2,
+    checkLabel,
+    checkValue
+  ) {
+    let p = this.pickPrompter({ domWin });
+    return p.confirmEx(
+      title,
+      text,
+      flags,
+      button0,
+      button1,
+      button2,
+      checkLabel,
+      checkValue
+    );
+  },
+
+  /**
+   * Puts up a dialog with up to 3 buttons and an optional, labeled checkbox.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {Number} flags - A combination of Button Flags.
+   * @param {String} button0 - Used when button 0 uses TITLE_IS_STRING.
+   * @param {String} button1 - Used when button 1 uses TITLE_IS_STRING.
+   * @param {String} button2 - Used when button 2 uses TITLE_IS_STRING.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        Null if no checkbox.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method is called and the final checked state
+   *        after this method returns.
+   * @returns {Number} The index of the button pressed.
+   */
+  confirmExBC(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType });
+    return p.confirmEx(...promptArgs);
+  },
+
+  /**
+   * Puts up a dialog with up to 3 buttons and an optional, labeled checkbox.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {Number} flags - A combination of Button Flags.
+   * @param {String} button0 - Used when button 0 uses TITLE_IS_STRING.
+   * @param {String} button1 - Used when button 1 uses TITLE_IS_STRING.
+   * @param {String} button2 - Used when button 2 uses TITLE_IS_STRING.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        Null if no checkbox.
+   * @param {Boolean} checkValue - The initial checked state of the checkbox.
+   * @param {Object} [extraArgs] - Extra arguments for the prompt metadata.
+   * @returns {Promise<nsIPropertyBag<{ buttonNumClicked: Number, checked: Boolean }>>}
+   */
+  asyncConfirmEx(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType, async: true });
+    return p.confirmEx(...promptArgs);
+  },
+
+  /**
+   * Puts up a dialog with an edit field and an optional, labeled checkbox.
+   * @param {mozIDOMWindowProxy} domWin - The parent window or null.
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {Object} value - Contains the default value for the dialog field
+   *        when this method is called (null value is ok).  Upon return, if
+   *        the user pressed OK, then this parameter contains a newly
+   *        allocated string value.
+   *        Otherwise, the parameter's value is unmodified.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        If null, check box will not be shown.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method is called and the final checked state
+   *        after this method returns.
+   * @returns {Boolean} true for OK, false for Cancel.
+   */
+  prompt(domWin, title, text, value, checkLabel, checkValue) {
+    let p = this.pickPrompter({ domWin });
+    return p.nsIPrompt_prompt(title, text, value, checkLabel, checkValue);
+  },
+
+  /**
+   * Puts up a dialog with an edit field and an optional, labeled checkbox.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {Object} value - Contains the default value for the dialog field
+   *        when this method is called (null value is ok).  Upon return, if
+   *        the user pressed OK, then this parameter contains a newly
+   *        allocated string value.
+   *        Otherwise, the parameter's value is unmodified.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        If null, check box will not be shown.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method is called and the final checked state
+   *        after this method returns.
+   * @returns {Boolean} true for OK, false for Cancel.
+   */
+  promptBC(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType });
+    return p.nsIPrompt_prompt(...promptArgs);
+  },
+
+  /**
+   * Puts up a dialog with an edit field and an optional, labeled checkbox.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {String} value - The default value for the dialog text field.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        If null, check box will not be shown.
+   * @param {Boolean} checkValue - The initial checked state of the checkbox.
+   * @returns {Promise<nsIPropertyBag<{ ok: Boolean, checked: Boolean, value: String }>>}
+   *          A promise which resolves when the prompt is dismissed.
+   */
+  asyncPrompt(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType, async: true });
+    return p.nsIPrompt_prompt(...promptArgs);
+  },
+
+  /**
+   * Puts up a dialog with an edit field, a password field, and an optional,
+   * labeled checkbox.
+   * @param {mozIDOMWindowProxy} domWin - The parent window or null.
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {Object} user - Contains the default value for the username
+   *        field when this method is called (null value is ok).
+   *        Upon return, if the user pressed OK, then this parameter contains
+   *        a newly allocated string value. Otherwise, the parameter's value
+   *        is unmodified.
+   * @param {Object} pass - Contains the default value for the password field
+   *        when this method is called (null value is ok). Upon return, if the
+   *        user pressed OK, this parameter contains a newly allocated string
+   *        value. Otherwise, the parameter's value is unmodified.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        If null, check box will not be shown.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method is called and the final checked state
+   *        after this method returns.
+   * @returns {Boolean} true for OK, false for Cancel.
+   */
+  promptUsernameAndPassword(
+    domWin,
+    title,
+    text,
+    user,
+    pass,
+    checkLabel,
+    checkValue
+  ) {
+    let p = this.pickPrompter({ domWin });
+    return p.nsIPrompt_promptUsernameAndPassword(
+      title,
+      text,
+      user,
+      pass,
+      checkLabel,
+      checkValue
+    );
+  },
+
+  /**
+   * Puts up a dialog with an edit field, a password field, and an optional,
+   * labeled checkbox.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {Object} user - Contains the default value for the username
+   *        field when this method is called (null value is ok).
+   *        Upon return, if the user pressed OK, then this parameter contains
+   *        a newly allocated string value. Otherwise, the parameter's value
+   *        is unmodified.
+   * @param {Object} pass - Contains the default value for the password field
+   *        when this method is called (null value is ok). Upon return, if the
+   *        user pressed OK, this parameter contains a newly allocated string
+   *        value. Otherwise, the parameter's value is unmodified.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        If null, check box will not be shown.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method is called and the final checked state
+   *        after this method returns.
+   * @returns {Boolean} true for OK, false for Cancel.
+   */
+  promptUsernameAndPasswordBC(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType });
+    return p.nsIPrompt_promptUsernameAndPassword(...promptArgs);
+  },
+
+  /**
+   * Puts up a dialog with an edit field, a password field, and an optional,
+   * labeled checkbox.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {String} user - Default value for the username field.
+   * @param {String} pass - Contains the default value for the password field.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        If null, check box will not be shown.
+   * @param {Boolean} checkValue - The initial checked state of the checkbox.
+   * @returns {Promise<nsIPropertyBag<{ ok: Boolean, checked: Boolean, user: String, pass: String }>>}
+   *          A promise which resolves when the prompt is dismissed.
+   */
+  asyncPromptUsernameAndPassword(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType, async: true });
+    return p.nsIPrompt_promptUsernameAndPassword(...promptArgs);
+  },
+
+  /**
+   * Puts up a dialog with a password field and an optional, labeled checkbox.
+   * @param {mozIDOMWindowProxy} domWin - The parent window or null.
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {Object} pass - Contains the default value for the password field
+   *        when this method is called (null value is ok). Upon return, if the
+   *        user pressed OK, this parameter contains a newly allocated string
+   *        value. Otherwise, the parameter's value is unmodified.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        If null, check box will not be shown.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method is called and the final checked state
+   *        after this method returns.
+   * @returns {Boolean} true for OK, false for Cancel.
+   */
+  promptPassword(domWin, title, text, pass, checkLabel, checkValue) {
+    let p = this.pickPrompter({ domWin });
+    return p.nsIPrompt_promptPassword(
+      title,
+      text,
+      pass,
+      checkLabel,
+      checkValue
+    );
+  },
+
+  /**
+   * Puts up a dialog with a password field and an optional, labeled checkbox.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {Object} pass - Contains the default value for the password field
+   *        when this method is called (null value is ok). Upon return, if the
+   *        user pressed OK, this parameter contains a newly allocated string
+   *        value. Otherwise, the parameter's value is unmodified.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        If null, check box will not be shown.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method is called and the final checked state
+   *        after this method returns.
+   * @returns {Boolean} true for OK, false for Cancel.
+   */
+  promptPasswordBC(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType });
+    return p.nsIPrompt_promptPassword(...promptArgs);
+  },
+
+  /**
+   * Puts up a dialog with a password field and an optional, labeled checkbox.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {String} pass - Contains the default value for the password field.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        If null, check box will not be shown.
+   * @param {Boolean} checkValue - The initial checked state of the checkbox.
+   * @returns {Promise<nsIPropertyBag<{ ok: Boolean, checked: Boolean, pass: String }>>}
+   *          A promise which resolves when the prompt is dismissed.
+   */
+  asyncPromptPassword(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType, async: true });
+    return p.nsIPrompt_promptPassword(...promptArgs);
+  },
+
+  /**
+   * Puts up a dialog box which has a list box of strings from which the user
+   * may make a single selection.
+   * @param {mozIDOMWindowProxy} domWin - The parent window or null.
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {String[]} list - The list of strings to display.
+   * @param {Object} selected - Contains the index of the selected item in the
+   *        list when this method returns true.
+   * @returns {Boolean} true for OK, false for Cancel.
+   */
+  select(domWin, title, text, list, selected) {
+    let p = this.pickPrompter({ domWin });
+    return p.select(title, text, list, selected);
+  },
+
+  /**
+   * Puts up a dialog box which has a list box of strings from which the user
+   * may make a single selection.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {String[]} list - The list of strings to display.
+   * @param {Object} selected - Contains the index of the selected item in the
+   *        list when this method returns true.
+   * @returns {Boolean} true for OK, false for Cancel.
+   */
+  selectBC(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType });
+    return p.select(...promptArgs);
+  },
+
+  /**
+   * Puts up a dialog box which has a list box of strings from which the user
+   * may make a single selection.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {String} title - Text to appear in the title of the dialog.
+   * @param {String} text - Text to appear in the body of the dialog.
+   * @param {String[]} list - The list of strings to display.
+   * @returns {Promise<nsIPropertyBag<{ selected: Number, ok: Boolean  }>>}
+   *          A promise which resolves when the prompt is dismissed.
+   */
+  asyncSelect(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType, async: true });
+    return p.select(...promptArgs);
+  },
+
+  /**
+   * Requests a username and a password. Shows a dialog with username and
+   * password field, depending on flags also a domain field.
+   * @param {mozIDOMWindowProxy} domWin - The parent window or null.
+   * @param {nsIChannel} channel - The channel that requires authentication.
+   * @param {Number} level - Security level of the credential transmission.
+   *        Any of nsIAuthPrompt2.<LEVEL_NONE|LEVEL_PW_ENCRYPTED|LEVEL_SECURE>
+   * @param {nsIAuthInformation} authInfo - Authentication information object.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        If null, check box will not be shown.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method is called and the final checked state
+   *        after this method returns.
+   * @returns {Boolean}
+   *          true: Authentication can proceed using the values
+   *          in the authInfo object.
+   *          false: Authentication should be cancelled, usually because the
+   *          user did not provide username/password.
+   */
+  promptAuth(domWin, channel, level, authInfo, checkLabel, checkValue) {
+    let p = this.pickPrompter({ domWin });
+    return p.promptAuth(channel, level, authInfo, checkLabel, checkValue);
+  },
+
+  /**
+   * Requests a username and a password. Shows a dialog with username and
+   * password field, depending on flags also a domain field.
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {nsIChannel} channel - The channel that requires authentication.
+   * @param {Number} level - Security level of the credential transmission.
+   *        Any of nsIAuthPrompt2.<LEVEL_NONE|LEVEL_PW_ENCRYPTED|LEVEL_SECURE>
+   * @param {nsIAuthInformation} authInfo - Authentication information object.
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        If null, check box will not be shown.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method is called and the final checked state
+   *        after this method returns.
+   * @returns {Boolean}
+   *          true: Authentication can proceed using the values
+   *          in the authInfo object.
+   *          false: Authentication should be cancelled, usually because the
+   *          user did not provide username/password.
+   */
+  promptAuthBC(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType });
+    return p.promptAuth(...promptArgs);
+  },
+
+  /**
+   * Asynchronously prompt the user for a username and password.
+   * This has largely the same semantics as promptUsernameAndPassword(),
+   * but returns immediately after calling and returns the entered
+   * data in a callback.
+   *
+   * @param {mozIDOMWindowProxy} domWin - The parent window or null.
+   * @param {nsIChannel} channel - The channel that requires authentication.
+   * @param {nsIAuthPromptCallback} callback - Called once the prompt has been
+   *        closed.
+   * @param {nsISupports} context
+   * @param {Number} level - Security level of the credential transmission.
+   *        Any of nsIAuthPrompt2.<LEVEL_NONE|LEVEL_PW_ENCRYPTED|LEVEL_SECURE>
+   * @param {nsIAuthInformation} authInfo
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        If null, check box will not be shown.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method is called and the final checked state
+   *        after the callback.
+   * @returns {nsICancelable} Interface to cancel prompt.
+   */
+  asyncPromptAuth(
+    domWin,
+    channel,
+    callback,
+    context,
+    level,
+    authInfo,
+    checkLabel,
+    checkValue
+  ) {
+    let p = this.pickPrompter({ domWin });
+    return p.asyncPromptAuth(
+      channel,
+      callback,
+      context,
+      level,
+      authInfo,
+      checkLabel,
+      checkValue
+    );
+  },
+
+  /**
+   * Asynchronously prompt the user for a username and password.
+   * This has largely the same semantics as promptUsernameAndPassword(),
+   * but returns immediately after calling and returns the entered
+   * data in a callback.
+   *
+   * @param {BrowsingContext} browsingContext - The browsing context the
+   *        prompt should be opened for.
+   * @param {Number} modalType - The modal type of the prompt.
+   *        nsIPromptService.<MODAL_TYPE_WINDOW|MODAL_TYPE_TAB|MODAL_TYPE_CONTENT>
+   * @param {nsIChannel} channel - The channel that requires authentication.
+   * @param {nsIAuthPromptCallback} callback - Called once the prompt has been
+   *        closed.
+   * @param {nsISupports} context
+   * @param {Number} level - Security level of the credential transmission.
+   *        Any of nsIAuthPrompt2.<LEVEL_NONE|LEVEL_PW_ENCRYPTED|LEVEL_SECURE>
+   * @param {nsIAuthInformation} authInfo
+   * @param {String} checkLabel - Text to appear with the checkbox.
+   *        If null, check box will not be shown.
+   * @param {Object} checkValue - Contains the initial checked state of the
+   *        checkbox when this method is called and the final checked state
+   *        after the callback.
+   * @returns {nsICancelable} Interface to cancel prompt.
+   */
+  asyncPromptAuthBC(browsingContext, modalType, ...promptArgs) {
+    let p = this.pickPrompter({ browsingContext, modalType });
+    return p.asyncPromptAuth(...promptArgs);
+  },
+};
+
+// Common utils not specific to a particular prompter style.
+var PromptUtilsTemp = {
+  __proto__: PromptUtils,
+
+  getLocalizedString(key, formatArgs) {
+    if (formatArgs) {
+      return this.strBundle.formatStringFromName(key, formatArgs);
+    }
+    return this.strBundle.GetStringFromName(key);
+  },
+
+  confirmExHelper(flags, button0, button1, button2) {
+    const BUTTON_DEFAULT_MASK = 0x03000000;
+    let defaultButtonNum = (flags & BUTTON_DEFAULT_MASK) >> 24;
+    let isDelayEnabled = flags & Ci.nsIPrompt.BUTTON_DELAY_ENABLE;
+
+    // Flags can be used to select a specific pre-defined button label or
+    // a caller-supplied string (button0/button1/button2). If no flags are
+    // set for a button, then the button won't be shown.
+    let argText = [button0, button1, button2];
+    let buttonLabels = [null, null, null];
+    for (let i = 0; i < 3; i++) {
+      let buttonLabel;
+      switch (flags & 0xff) {
+        case Ci.nsIPrompt.BUTTON_TITLE_OK:
+          buttonLabel = PromptUtils.getLocalizedString("OK");
+          break;
+        case Ci.nsIPrompt.BUTTON_TITLE_CANCEL:
+          buttonLabel = PromptUtils.getLocalizedString("Cancel");
+          break;
+        case Ci.nsIPrompt.BUTTON_TITLE_YES:
+          buttonLabel = PromptUtils.getLocalizedString("Yes");
+          break;
+        case Ci.nsIPrompt.BUTTON_TITLE_NO:
+          buttonLabel = PromptUtils.getLocalizedString("No");
+          break;
+        case Ci.nsIPrompt.BUTTON_TITLE_SAVE:
+          buttonLabel = PromptUtils.getLocalizedString("Save");
+          break;
+        case Ci.nsIPrompt.BUTTON_TITLE_DONT_SAVE:
+          buttonLabel = PromptUtils.getLocalizedString("DontSave");
+          break;
+        case Ci.nsIPrompt.BUTTON_TITLE_REVERT:
+          buttonLabel = PromptUtils.getLocalizedString("Revert");
+          break;
+        case Ci.nsIPrompt.BUTTON_TITLE_IS_STRING:
+          buttonLabel = argText[i];
+          break;
+      }
+      if (buttonLabel) {
+        buttonLabels[i] = buttonLabel;
+      }
+      flags >>= 8;
+    }
+
+    return [
+      buttonLabels[0],
+      buttonLabels[1],
+      buttonLabels[2],
+      defaultButtonNum,
+      isDelayEnabled,
+    ];
+  },
+
+  getAuthInfo(authInfo) {
+    let username, password;
+
+    let flags = authInfo.flags;
+    if (flags & Ci.nsIAuthInformation.NEED_DOMAIN && authInfo.domain) {
+      username = authInfo.domain + "\\" + authInfo.username;
+    } else {
+      username = authInfo.username;
+    }
+
+    password = authInfo.password;
+
+    return [username, password];
+  },
+
+  setAuthInfo(authInfo, username, password) {
+    let flags = authInfo.flags;
+    if (flags & Ci.nsIAuthInformation.NEED_DOMAIN) {
+      // Domain is separated from username by a backslash
+      let idx = username.indexOf("\\");
+      if (idx == -1) {
+        authInfo.username = username;
+      } else {
+        authInfo.domain = username.substring(0, idx);
+        authInfo.username = username.substring(idx + 1);
+      }
+    } else {
+      authInfo.username = username;
+    }
+    authInfo.password = password;
+  },
+
+  /**
+   * Strip out things like userPass and path for display.
+   */
+  getFormattedHostname(uri) {
+    return uri.scheme + "://" + uri.hostPort;
+  },
+
+  // Copied from login manager
+  getAuthTarget(aChannel, aAuthInfo) {
+    let hostname, realm;
+
+    // If our proxy is demanding authentication, don't use the
+    // channel's actual destination.
+    if (aAuthInfo.flags & Ci.nsIAuthInformation.AUTH_PROXY) {
+      if (!(aChannel instanceof Ci.nsIProxiedChannel)) {
+        throw new Error("proxy auth needs nsIProxiedChannel");
+      }
+
+      let info = aChannel.proxyInfo;
+      if (!info) {
+        throw new Error("proxy auth needs nsIProxyInfo");
+      }
+
+      // Proxies don't have a scheme, but we'll use "moz-proxy://"
+      // so that it's more obvious what the login is for.
+      let idnService = Cc["@mozilla.org/network/idn-service;1"].getService(
+        Ci.nsIIDNService
+      );
+      hostname =
+        "moz-proxy://" +
+        idnService.convertUTF8toACE(info.host) +
+        ":" +
+        info.port;
+      realm = aAuthInfo.realm;
+      if (!realm) {
+        realm = hostname;
+      }
+
+      return [hostname, realm];
+    }
+
+    hostname = this.getFormattedHostname(aChannel.URI);
+
+    // If a HTTP WWW-Authenticate header specified a realm, that value
+    // will be available here. If it wasn't set or wasn't HTTP, we'll use
+    // the formatted hostname instead.
+    realm = aAuthInfo.realm;
+    if (!realm) {
+      realm = hostname;
+    }
+
+    return [hostname, realm];
+  },
+
+  makeAuthMessage(channel, authInfo) {
+    let isProxy = authInfo.flags & Ci.nsIAuthInformation.AUTH_PROXY;
+    let isPassOnly = authInfo.flags & Ci.nsIAuthInformation.ONLY_PASSWORD;
+    let isCrossOrig =
+      authInfo.flags & Ci.nsIAuthInformation.CROSS_ORIGIN_SUB_RESOURCE;
+
+    let username = authInfo.username;
+    let [displayHost, realm] = this.getAuthTarget(channel, authInfo);
+
+    // Suppress "the site says: $realm" when we synthesized a missing realm.
+    if (!authInfo.realm && !isProxy) {
+      realm = "";
+    }
+
+    // Trim obnoxiously long realms.
+    if (realm.length > 150) {
+      realm = realm.substring(0, 150);
+      // Append "..." (or localized equivalent).
+      realm += this.ellipsis;
+    }
+
+    let text;
+    if (isProxy) {
+      text = PromptUtils.getLocalizedString("EnterLoginForProxy3", [
+        realm,
+        displayHost,
+      ]);
+    } else if (isPassOnly) {
+      text = PromptUtils.getLocalizedString("EnterPasswordFor", [
+        username,
+        displayHost,
+      ]);
+    } else if (isCrossOrig) {
+      text = PromptUtils.getLocalizedString(
+        "EnterUserPasswordForCrossOrigin2",
+        [displayHost]
+      );
+    } else if (!realm) {
+      text = PromptUtils.getLocalizedString("EnterUserPasswordFor2", [
+        displayHost,
+      ]);
+    } else {
+      text = PromptUtils.getLocalizedString("EnterLoginForRealm3", [
+        realm,
+        displayHost,
+      ]);
+    }
+
+    return text;
+  },
+
+  getBrandFullName() {
+    return this.brandBundle.GetStringFromName("brandFullName");
+  },
+};
+
+PromptUtils = PromptUtilsTemp;
+
+XPCOMUtils.defineLazyGetter(PromptUtils, "strBundle", function() {
+  let bundle = Services.strings.createBundle(
+    "chrome://global/locale/commonDialogs.properties"
+  );
+  if (!bundle) {
+    throw new Error("String bundle for Prompter not present!");
+  }
+  return bundle;
+});
+
+XPCOMUtils.defineLazyGetter(PromptUtils, "brandBundle", function() {
+  let bundle = Services.strings.createBundle(
+    "chrome://branding/locale/brand.properties"
+  );
+  if (!bundle) {
+    throw new Error("String bundle for branding not present!");
+  }
+  return bundle;
+});
+
+XPCOMUtils.defineLazyGetter(PromptUtils, "ellipsis", function() {
+  let ellipsis = "\u2026";
+  try {
+    ellipsis = Services.prefs.getComplexValue(
+      "intl.ellipsis",
+      Ci.nsIPrefLocalizedString
+    ).data;
+  } catch (e) {}
+  return ellipsis;
+});
+
+class ModalPrompter {
+  constructor({
+    browsingContext = null,
+    domWin = null,
+    modalType = null,
+    async = false,
+  }) {
+    if (browsingContext && domWin) {
+      throw new Error("Pass either browsingContext or domWin");
+    }
+
+    if (domWin) {
+      // We have a domWin, get the associated browsing context
+      this.browsingContext = BrowsingContext.getFromWindow(domWin);
+    } else {
+      this.browsingContext = browsingContext;
+    }
+
+    // Use given modal type or fallback to default
+    this.modalType = modalType || ModalPrompter.defaultModalType;
+
+    this.async = async;
+
+    this.QueryInterface = ChromeUtils.generateQI([
+      "nsIPrompt",
+      "nsIAuthPrompt",
+      "nsIAuthPrompt2",
+      "nsIWritablePropertyBag2",
+    ]);
+  }
+
+  set modalType(modalType) {
+    // Setting modal type window is always allowed
+    if (modalType == Ci.nsIPrompt.MODAL_TYPE_WINDOW) {
+      this._modalType = modalType;
+      return;
+    }
+
+    // We can't use content / tab prompts if we don't have a suitable parent.
+    if (!this.browsingContext?.isContent) {
+      modalType = Ci.nsIPrompt.MODAL_TYPE_WINDOW;
+
+      Cu.reportError(
+        "Prompter: Browser not available. Falling back to window prompt."
+      );
+    }
+    this._modalType = modalType;
+  }
+
+  get modalType() {
+    return this._modalType;
+  }
+
+  /* ---------- internal methods ---------- */
+
+  /**
+   * Synchronous wrapper around {@link ModalPrompter#openPrompt}
+   * @param {Object} args Prompt arguments. When prompt has been closed, they are updated to reflect the result state.
+   */
+  openPromptSync(args) {
+    let closed = false;
+    this.openPrompt(args)
+      .then(returnedArgs => {
+        if (returnedArgs) {
+          for (let key in returnedArgs) {
+            args[key] = returnedArgs[key];
+          }
+        }
+      })
+      .finally(() => {
+        closed = true;
+      });
+    Services.tm.spinEventLoopUntilOrShutdown(() => closed);
+  }
+
+  async openPrompt(args) {
+    if (!this.browsingContext) {
+      // We don't have a browsing context, fallback to a window prompt.
+      this.openWindowPrompt(null, args);
+      return args;
+    }
+
+    // Select prompts are not part of CommonDialog
+    // and thus not supported as tab or content prompts yet. See Bug 1622817.
+    // Once they are integrated this override should be removed.
+    if (
+      args.promptType == "select" &&
+      this.modalType !== Ci.nsIPrompt.MODAL_TYPE_WINDOW
+    ) {
+      Cu.reportError(
+        "Prompter: 'select' prompts do not support tab/content prompting. Falling back to window prompt."
+      );
+      args.modalType = Ci.nsIPrompt.MODAL_TYPE_WINDOW;
+    } else {
+      args.modalType = this.modalType;
+    }
+
+    const IS_CONTENT =
+      Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_CONTENT;
+
+    let actor;
+    try {
+      if (IS_CONTENT) {
+        // When in the content, get the PromptChild actor.
+        actor = this.browsingContext.window.windowGlobalChild.getActor(
+          "Prompt"
+        );
+      } else {
+        // When in the parent, get the PromptParent actor.
+        actor = this.browsingContext.currentWindowGlobal.getActor("Prompt");
+      }
+    } catch (_) {
+      // We can't get the prompt actor, fallback to window prompt.
+      let parentWin;
+      // If given a chrome BC we can try to get its window
+      if (!this.browsingContext.isContent && this.browsingContext.window) {
+        parentWin = this.browsingContext.window;
+      } else {
+        // Try to get the window which is the browsers parent
+        parentWin = this.browsingContext.top?.embedderElement?.ownerGlobal;
+      }
+      this.openWindowPrompt(parentWin, args);
+      return args;
+    }
+
+    if (IS_CONTENT) {
+      args.promptPrincipal = this.browsingContext.window?.document.nodePrincipal;
+
+      let docShell = this.browsingContext.docShell;
+      let inPermitUnload = docShell?.contentViewer?.inPermitUnload;
+      args.inPermitUnload = inPermitUnload;
+      let eventDetail = Cu.cloneInto(
+        {
+          tabPrompt: this.modalType != Ci.nsIPrompt.MODAL_TYPE_WINDOW,
+          inPermitUnload,
+        },
+        this.browsingContext.window
+      );
+      PromptUtils.fireDialogEvent(
+        this.browsingContext.window,
+        "DOMWillOpenModalDialog",
+        null,
+        eventDetail
+      );
+
+      // Put content window in the modal state while the prompt is open.
+      let windowUtils = this.browsingContext.window?.windowUtils;
+      if (windowUtils) {
+        windowUtils.enterModalState();
+      }
+    }
+
+    // It is technically possible for multiple prompts to be sent from a single
+    // BrowsingContext. See bug 1266353. We use a randomly generated UUID to
+    // differentiate between the different prompts.
+    let id =
+      "id" +
+      Cc["@mozilla.org/uuid-generator;1"]
+        .getService(Ci.nsIUUIDGenerator)
+        .generateUUID()
+        .toString();
+
+    args._remoteId = id;
+
+    let returnedArgs;
+    try {
+      if (IS_CONTENT) {
+        // If we're in the content process, send a message to the PromptParent
+        // window actor.
+        returnedArgs = await actor.sendQuery("Prompt:Open", args);
+      } else {
+        // If we're in the parent process we already have the parent actor.
+        // We can call its message handler directly.
+        returnedArgs = await actor.receiveMessage({
+          name: "Prompt:Open",
+          data: args,
+        });
+      }
+
+      if (returnedArgs?.promptAborted) {
+        throw Components.Exception(
+          "prompt aborted by user",
+          Cr.NS_ERROR_NOT_AVAILABLE
+        );
+      }
+    } finally {
+      if (IS_CONTENT) {
+        let windowUtils = this.browsingContext.window?.windowUtils;
+        if (windowUtils) {
+          windowUtils.leaveModalState();
+        }
+        PromptUtils.fireDialogEvent(
+          this.browsingContext.window,
+          "DOMModalDialogClosed"
+        );
+      }
+    }
+    return returnedArgs;
+  }
+
+  /**
+   * Open a window modal prompt
+   *
+   * There's an implied contract that says modal prompts should still work when
+   * no "parent" window is passed for the dialog (eg, the "Master Password"
+   * dialog does this).  These prompts must be shown even if there are *no*
+   * visible windows at all.
+   * We try and find a window to use as the parent, but don't consider if that
+   * is visible before showing the prompt. parentWindow may still be null if
+   * there are _no_ windows open.
+   * @param {Window} [parentWindow] - The parent window for the prompt, may be
+   *        null.
+   * @param {Object} args - Prompt options and return values.
+   */
+  openWindowPrompt(parentWindow = null, args) {
+    const COMMON_DIALOG = "chrome://global/content/commonDialog.xhtml";
+    const SELECT_DIALOG = "chrome://global/content/selectDialog.xhtml";
+
+    let uri = args.promptType == "select" ? SELECT_DIALOG : COMMON_DIALOG;
+    let propBag = PromptUtils.objectToPropBag(args);
+    Services.ww.openWindow(
+      parentWindow || Services.ww.activeWindow,
+      uri,
+      "_blank",
+      "centerscreen,chrome,modal,titlebar",
+      propBag
+    );
+    PromptUtils.propBagToObject(propBag, args);
+  }
+
+  /**
+   * Calls async prompt method and optionally runs promise chained task on
+   * result data. Converts result data to nsIPropertyBag.
+   * @param {Object} args - Prompt arguments.
+   * @param {Function} [task] - Function which is called with the modified
+   *  prompt args object once the prompt has been closed. Must return a
+   *  result object for the prompt caller.
+   * @returns {Promise<nsIPropertyBag>} - Resolves with a property bag holding the
+   * prompt result properties. Resolves once prompt has been closed.
+   */
+  async openPromptAsync(args, task) {
+    let result = await this.openPrompt(args);
+    // If task is not defined, the prompt method does not return
+    // anything. In this case we can resolve without value.
+    if (!task) {
+      return undefined;
+    }
+    // Convert task result to nsIPropertyBag and resolve
+    let taskResult = task(result);
+    if (!(taskResult instanceof Object)) {
+      throw new Error("task must return object");
+    }
+    return objectToPropBag(taskResult);
+  }
+
+  /*
+   * ---------- interface disambiguation ----------
+   *
+   * nsIPrompt and nsIAuthPrompt share 3 method names with slightly
+   * different arguments. All but prompt() have the same number of
+   * arguments, so look at the arg types to figure out how we're being
+   * called. :-(
+   */
+  prompt() {
+    // also, the nsIPrompt flavor has 5 args instead of 6.
+    if (typeof arguments[2] == "object") {
+      return this.nsIPrompt_prompt.apply(this, arguments);
+    }
+    return this.nsIAuthPrompt_prompt.apply(this, arguments);
+  }
+
+  promptUsernameAndPassword() {
+    // Both have 6 args, so use types.
+    if (typeof arguments[2] == "object") {
+      return this.nsIPrompt_promptUsernameAndPassword.apply(this, arguments);
+    }
+    return this.nsIAuthPrompt_promptUsernameAndPassword.apply(this, arguments);
+  }
+
+  promptPassword() {
+    // Both have 5 args, so use types.
+    if (typeof arguments[2] == "object") {
+      return this.nsIPrompt_promptPassword.apply(this, arguments);
+    }
+    return this.nsIAuthPrompt_promptPassword.apply(this, arguments);
+  }
+
+  /* ----------  nsIPrompt  ---------- */
+
+  alert(title, text) {
+    if (!title) {
+      title = PromptUtils.getLocalizedString("Alert");
+    }
+
+    let args = {
+      promptType: "alert",
+      title,
+      text,
+    };
+
+    if (this.async) {
+      return this.openPromptAsync(args);
+    }
+
+    return this.openPromptSync(args);
+  }
+
+  alertCheck(title, text, checkLabel, checkValue) {
+    if (!title) {
+      title = PromptUtils.getLocalizedString("Alert");
+    }
+
+    // For sync calls checkValue is an XPCOM inout. XPCOM wraps primitves in
+    // objects for call by reference.
+    // The async version of this method uses call by value.
+    let checked = this.async ? checkValue : checkValue.value;
+
+    let args = {
+      promptType: "alertCheck",
+      title,
+      text,
+      checkLabel,
+      checked,
+    };
+
+    if (this.async) {
+      return this.openPromptAsync(args, result => ({
+        checked: result.checked,
+      }));
+    }
+
+    this.openPromptSync(args);
+    checkValue.value = args.checked;
+    return undefined;
+  }
+
+  confirm(title, text) {
+    if (!title) {
+      title = PromptUtils.getLocalizedString("Confirm");
+    }
+
+    let args = {
+      promptType: "confirm",
+      title,
+      text,
+      ok: false,
+    };
+
+    if (this.async) {
+      return this.openPromptAsync(args, result => ({ ok: result.ok }));
+    }
+
+    this.openPromptSync(args);
+    return args.ok;
+  }
+
+  confirmCheck(title, text, checkLabel, checkValue) {
+    if (!title) {
+      title = PromptUtils.getLocalizedString("ConfirmCheck");
+    }
+
+    let checked = this.async ? checkValue : checkValue.value;
+
+    let args = {
+      promptType: "confirmCheck",
+      title,
+      text,
+      checkLabel,
+      checked,
+      ok: false,
+    };
+
+    if (this.async) {
+      return this.openPromptAsync(args, result => ({
+        // Checkbox state always returned, even if cancel clicked.
+        checked: result.checked,
+        // Did user click Ok or Cancel?
+        ok: result.ok,
+      }));
+    }
+
+    this.openPromptSync(args);
+    checkValue.value = args.checked;
+    return args.ok;
+  }
+
+  confirmEx(
+    title,
+    text,
+    flags,
+    button0,
+    button1,
+    button2,
+    checkLabel,
+    checkValue,
+    extraArgs = {}
+  ) {
+    if (!title) {
+      title = PromptUtils.getLocalizedString("Confirm");
+    }
+
+    let args = {
+      promptType: "confirmEx",
+      title,
+      text,
+      checkLabel,
+      checked: this.async ? checkValue : checkValue.value,
+      ok: false,
+      buttonNumClicked: 1,
+      ...extraArgs,
+    };
+
+    let [
+      label0,
+      label1,
+      label2,
+      defaultButtonNum,
+      isDelayEnabled,
+    ] = PromptUtils.confirmExHelper(flags, button0, button1, button2);
+
+    args.defaultButtonNum = defaultButtonNum;
+    args.enableDelay = isDelayEnabled;
+
+    if (label0) {
+      args.button0Label = label0;
+      if (label1) {
+        args.button1Label = label1;
+        if (label2) {
+          args.button2Label = label2;
+        }
+      }
+    }
+
+    if (this.async) {
+      return this.openPromptAsync(args, result => ({
+        checked: !!result.checked,
+        buttonNumClicked: result.buttonNumClicked,
+      }));
+    }
+
+    this.openPromptSync(args);
+    checkValue.value = args.checked;
+    return args.buttonNumClicked;
+  }
+
+  nsIPrompt_prompt(title, text, value, checkLabel, checkValue) {
+    if (!title) {
+      title = PromptUtils.getLocalizedString("Prompt");
+    }
+
+    let args = {
+      promptType: "prompt",
+      title,
+      text,
+      value: this.async ? value : value.value,
+      checkLabel,
+      checked: this.async ? checkValue : checkValue.value,
+      ok: false,
+    };
+
+    if (this.async) {
+      return this.openPromptAsync(args, result => ({
+        checked: !!result.checked,
+        value: result.value,
+        ok: result.ok,
+      }));
+    }
+
+    this.openPromptSync(args);
+
+    // Did user click Ok or Cancel?
+    let ok = args.ok;
+    if (ok) {
+      checkValue.value = args.checked;
+      value.value = args.value;
+    }
+
+    return ok;
+  }
+
+  nsIPrompt_promptUsernameAndPassword(
+    title,
+    text,
+    user,
+    pass,
+    checkLabel,
+    checkValue
+  ) {
+    if (!title) {
+      title = PromptUtils.getLocalizedString("PromptUsernameAndPassword3", [
+        PromptUtils.getBrandFullName(),
+      ]);
+    }
+
+    let args = {
+      promptType: "promptUserAndPass",
+      title,
+      text,
+      user: this.async ? user : user.value,
+      pass: this.async ? pass : pass.value,
+      checkLabel,
+      checked: this.async ? checkValue : checkValue.value,
+      ok: false,
+    };
+
+    if (this.async) {
+      return this.openPromptAsync(args, result => ({
+        checked: result.checked,
+        user: result.user,
+        pass: result.pass,
+        ok: result.ok,
+      }));
+    }
+
+    this.openPromptSync(args);
+
+    // Did user click Ok or Cancel?
+    let ok = args.ok;
+    if (ok) {
+      checkValue.value = args.checked;
+      user.value = args.user;
+      pass.value = args.pass;
+    }
+
+    return ok;
+  }
+
+  nsIPrompt_promptPassword(title, text, pass, checkLabel, checkValue) {
+    if (!title) {
+      title = PromptUtils.getLocalizedString("PromptPassword3", [
+        PromptUtils.getBrandFullName(),
+      ]);
+    }
+
+    let args = {
+      promptType: "promptPassword",
+      title,
+      text,
+      pass: this.async ? pass : pass.value,
+      checkLabel,
+      checked: this.async ? checkValue : checkValue.value,
+      ok: false,
+    };
+
+    if (this.async) {
+      return this.openPromptAsync(args, result => ({
+        checked: result.checked,
+        pass: result.pass,
+        ok: result.ok,
+      }));
+    }
+
+    this.openPromptSync(args);
+
+    // Did user click Ok or Cancel?
+    let ok = args.ok;
+    if (ok) {
+      checkValue.value = args.checked;
+      pass.value = args.pass;
+    }
+
+    return ok;
+  }
+
+  select(title, text, list, selected) {
+    if (!title) {
+      title = PromptUtils.getLocalizedString("Select");
+    }
+
+    let args = {
+      promptType: "select",
+      title,
+      text,
+      list,
+      selected: -1,
+      ok: false,
+    };
+
+    if (this.async) {
+      return this.openPromptAsync(args, result => ({
+        selected: result.selected,
+        ok: result.ok,
+      }));
+    }
+
+    this.openPromptSync(args);
+
+    // Did user click Ok or Cancel?
+    let ok = args.ok;
+    if (ok) {
+      selected.value = args.selected;
+    }
+
+    return ok;
+  }
+
+  /* ----------  nsIAuthPrompt  ---------- */
+
+  nsIAuthPrompt_prompt(
+    title,
+    text,
+    passwordRealm,
+    savePassword,
+    defaultText,
+    result
+  ) {
+    // The passwordRealm and savePassword args were ignored by nsPrompt.cpp
+    if (defaultText) {
+      result.value = defaultText;
+    }
+    return this.nsIPrompt_prompt(title, text, result, null, {});
+  }
+
+  nsIAuthPrompt_promptUsernameAndPassword(
+    title,
+    text,
+    passwordRealm,
+    savePassword,
+    user,
+    pass
+  ) {
+    // The passwordRealm and savePassword args were ignored by nsPrompt.cpp
+    return this.nsIPrompt_promptUsernameAndPassword(
+      title,
+      text,
+      user,
+      pass,
+      null,
+      {}
+    );
+  }
+
+  nsIAuthPrompt_promptPassword(title, text, passwordRealm, savePassword, pass) {
+    // The passwordRealm and savePassword args were ignored by nsPrompt.cpp
+    return this.nsIPrompt_promptPassword(title, text, pass, null, {});
+  }
+
+  /* ----------  nsIAuthPrompt2  ---------- */
+
+  promptAuth(channel, level, authInfo, checkLabel, checkValue) {
+    let message = PromptUtils.makeAuthMessage(channel, authInfo);
+
+    let [username, password] = PromptUtils.getAuthInfo(authInfo);
+
+    let userParam = { value: username };
+    let passParam = { value: password };
+
+    let ok;
+    if (authInfo.flags & Ci.nsIAuthInformation.ONLY_PASSWORD) {
+      ok = this.nsIPrompt_promptPassword(
+        null,
+        message,
+        passParam,
+        checkLabel,
+        checkValue
+      );
+    } else {
+      ok = this.nsIPrompt_promptUsernameAndPassword(
+        null,
+        message,
+        userParam,
+        passParam,
+        checkLabel,
+        checkValue
+      );
+    }
+
+    if (ok) {
+      PromptUtils.setAuthInfo(authInfo, userParam.value, passParam.value);
+    }
+    return ok;
+  }
+
+  asyncPromptAuth(
+    channel,
+    callback,
+    context,
+    level,
+    authInfo,
+    checkLabel,
+    checkValue
+  ) {
+    // Nothing calls this directly; netwerk ends up going through
+    // nsIPromptService::GetPrompt, which delegates to login manager.
+    // Login manger handles the async bits itself, and only calls out
+    // promptAuth, never asyncPromptAuth.
+    //
+    // Bug 565582 will change this.
+    throw Components.Exception("", Cr.NS_ERROR_NOT_IMPLEMENTED);
+  }
+
+  /* ----------  nsIWritablePropertyBag2 ---------- */
+  // Legacy way to set modal type when prompting via nsIPrompt.
+  // Please prompt via nsIPromptService. This will be removed in the future.
+  setPropertyAsUint32(name, value) {
+    if (name == "modalType") {
+      this.modalType = value;
+    } else {
+      throw Components.Exception("", Cr.NS_ERROR_ILLEGAL_VALUE);
+    }
+  }
+}
+
+XPCOMUtils.defineLazyPreferenceGetter(
+  ModalPrompter,
+  "defaultModalType",
+  "prompts.defaultModalType",
+  Ci.nsIPrompt.MODAL_TYPE_WINDOW
+);
+
+function AuthPromptAdapterFactory() {}
+AuthPromptAdapterFactory.prototype = {
+  classID: Components.ID("{6e134924-6c3a-4d86-81ac-69432dd971dc}"),
+  QueryInterface: ChromeUtils.generateQI(["nsIAuthPromptAdapterFactory"]),
+
+  /* ----------  nsIAuthPromptAdapterFactory ---------- */
+
+  createAdapter(oldPrompter) {
+    return new AuthPromptAdapter(oldPrompter);
+  },
+};
+
+// Takes an nsIAuthPrompt implementation, wraps it with a nsIAuthPrompt2 shell.
+function AuthPromptAdapter(oldPrompter) {
+  this.oldPrompter = oldPrompter;
+}
+AuthPromptAdapter.prototype = {
+  QueryInterface: ChromeUtils.generateQI(["nsIAuthPrompt2"]),
+  oldPrompter: null,
+
+  /* ----------  nsIAuthPrompt2 ---------- */
+
+  promptAuth(channel, level, authInfo, checkLabel, checkValue) {
+    let message = PromptUtils.makeAuthMessage(channel, authInfo);
+
+    let [username, password] = PromptUtils.getAuthInfo(authInfo);
+    let userParam = { value: username };
+    let passParam = { value: password };
+
+    let [host, realm] = PromptUtils.getAuthTarget(channel, authInfo);
+    let authTarget = host + " (" + realm + ")";
+
+    let ok;
+    if (authInfo.flags & Ci.nsIAuthInformation.ONLY_PASSWORD) {
+      ok = this.oldPrompter.promptPassword(
+        null,
+        message,
+        authTarget,
+        Ci.nsIAuthPrompt.SAVE_PASSWORD_PERMANENTLY,
+        passParam
+      );
+    } else {
+      ok = this.oldPrompter.promptUsernameAndPassword(
+        null,
+        message,
+        authTarget,
+        Ci.nsIAuthPrompt.SAVE_PASSWORD_PERMANENTLY,
+        userParam,
+        passParam
+      );
+    }
+
+    if (ok) {
+      PromptUtils.setAuthInfo(authInfo, userParam.value, passParam.value);
+    }
+    return ok;
+  },
+
+  asyncPromptAuth(
+    channel,
+    callback,
+    context,
+    level,
+    authInfo,
+    checkLabel,
+    checkValue
+  ) {
+    throw Components.Exception("", Cr.NS_ERROR_NOT_IMPLEMENTED);
+  },
+};
+
+// Wrapper using the old embedding contractID, since it's already common in
+// the addon ecosystem.
+function EmbedPrompter() {}
+EmbedPrompter.prototype = new Prompter();
+EmbedPrompter.prototype.classID = Components.ID(
+  "{7ad1b327-6dfa-46ec-9234-f2a620ea7e00}"
+);
+
+var EXPORTED_SYMBOLS = [
+  "Prompter",
+  "EmbedPrompter",
+  "AuthPromptAdapterFactory",
+];