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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content test test/one
locale ab-X-stuff test/three
overlay chrome://one/file.xml chrome://two/otherfile.xml
skin test classic test/one