DXR will be turned off on Tuesday, December 29th. It will redirect to Searchfox.
See the announcement on Discourse.

DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Line Code
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<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin" type="text/css"?>

<window title="Resizer"
        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" localedir="rtl">
  <hbox>
    <spacer flex="1"/>
    <resizer dir="bottomstart"/>
  </hbox>
</window>