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.

Mercurial (9db06216deb2)

VCS Links

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For information about installing, running and configuring Firefox 
including a list of known issues and troubleshooting information, 
refer to: http://getfirefox.com/releases/