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.

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component {6bcb9bde-9018-4443-a071-c32653469597} PlacesProtocolHandler.js
contract @mozilla.org/network/protocol;1?name=place {6bcb9bde-9018-4443-a071-c32653469597}