/usr/lib/python2.7/dist-packages/mopidy_youtube/ext.conf is in mopidy-youtube 2.0.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [youtube]
enabled = true
# TODO: Add additional config values and their default values here, or remove
# this comment entirely.
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