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.

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<?xml-stylesheet href='chrome://global/skin' type='text/css'?>
<window xmlns='http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul' align='start' pack='start' style='-moz-appearance: none; margin: 0; padding: 0; border: 0; min-width: 180px; min-height: 210px;'>
<resizer dir='bottomright' flex='1' width='150' height='150' style='-moz-appearance: none; margin: 0; border: 0; padding: 0;'/>
</window>