This file is indexed.

/etc/signon-ui/webkit-options.d/api.weibo.com.conf is in account-plugin-sina 0.12+16.04.20160126-0ubuntu1.

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="userId"]
PasswordField = input[name="passwd"]