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/usr/lib/thunderbird-addons/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/chrome/lightning/content/lightning/imip-bar-overlay.xul is in xul-ext-lightning 1:24.4.0+build1-0ubuntu1.

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<?xml version="1.0" encoding="UTF-8"?>
<!-- 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/. -->

<!DOCTYPE overlay [
    <!ENTITY % lightningDTD SYSTEM "chrome://lightning/locale/lightning.dtd">
    %lightningDTD;
]>

<!-- Use the Thunderbird Notification bar style for our iMIP warning -->
<?xml-stylesheet href="chrome://messenger/skin/primaryToolbar.css" type="text/css"?>
<?xml-stylesheet href="chrome://messenger/skin/messageHeader.css" type="text/css"?>

<?xml-stylesheet href="chrome://lightning/skin/lightning.css" type="text/css"?>
<?xml-stylesheet href="chrome://lightning/content/lightning-widgets.css" type="text/css"?>

<overlay xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

    <script type="application/javascript"
            src="chrome://lightning/content/lightning-utils.js"/>
    <script type="application/javascript"
            src="chrome://calendar/content/calUtils.js"/>
    <script type="application/javascript"
            src="chrome://lightning/content/imip-bar.js"/>
    <script type="application/javascript"
            src="chrome://calendar/content/calendar-management.js"/>
    <script type="application/javascript"
            src="chrome://calendar/content/calendar-ui-utils.js"/>

    <vbox id="messagepanebox">
      <vbox id="singlemessage" insertbefore="msgHeaderView">
        <lightning-notification-bar id="imip-bar"
                                    collapsed="true"
                                    insertbefore="msgHeaderView"
                                    label="&lightning.imipbar.description;">
          <button id="imip-button1" hidden="true"/>
          <button id="imip-button2" hidden="true"/>
          <button id="imip-button3" hidden="true"/>
        </lightning-notification-bar>
      </vbox>
    </vbox>
</overlay>