This file is indexed.

/etc/signon-ui/webkit-options.d/login.yahoo.com.conf is in account-plugin-flickr 0.11+14.04.20140409.1-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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UsernameField = input[name="login"]
PasswordField = input[name="passwd"]