How do I mark a bug as a duplicate of another bug?

Open the popup dialog for the bug that is a duplicate, click "Mark as resolved" or "Close this bug", select "Duplicate" as resolution, and select the other bug that the bug is a duplicate of:

Closing a bug as a duplicate of another bug

This will resolve or close the duplicate bug, and will add an "Is duplicate of" relationship to the other bug, representing the duplication:

A relationship to a duplicate bug that has been closed as duplicate

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