gecko/mobile/chrome/content/notification.xml

<?xml version="1.0"?>
<!DOCTYPE bindings PUBLIC "-//MOZILLA//DTD XBL V1.0//EN" "http://www.mozilla.org/xbl">

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

  <binding id="notification" extends="chrome://global/content/bindings/notification.xml#notification">
    <resources>
      <stylesheet src="chrome://browser/skin/notification.css"/>
    </resources>

    <content>
      <xul:hbox class="notification-inner outset" flex="1" xbl:inherits="type">
        <xul:vbox flex="1">
          <xul:hbox anonid="details" align="center" flex="1">
            <xul:image anonid="messageImage" class="messageImage" xbl:inherits="src=image"/>
            <xul:description anonid="messageText" class="messageText" flex="1" xbl:inherits="xbl:text=label"/>
            <xul:spacer flex="1"/>
          </xul:hbox>
          <xul:hbox pack="center"
                    oncommand="document.getBindingParent(this)._doButtonCommand(event);">
            <children/>
          </xul:hbox>
        </xul:vbox>
        <xul:toolbarbutton ondblclick="event.stopPropagation();"
                           class="messageCloseButton tabbable"
                           xbl:inherits="hidden=hideclose"
                           oncommand="document.getBindingParent(this).close();"/>
      </xul:hbox>
    </content>
  </binding>

  <binding id="notification-button"
           extends="chrome://global/content/bindings/button.xml#button-base">
    <resources>
      <stylesheet src="chrome://browser/skin/notification.css"/>
    </resources>

    <content orient="vertical">
      <xul:image class="sn-button-icon" xbl:inherits="src=image"/>
      <xul:label class="sn-button-text" xbl:inherits="value=label,accesskey,crop"/>
      <xul:label class="sn-button-extra-text" xbl:inherits="value=sublabel"/>
    </content>
  </binding>

</bindings>