/usr/share/xul-ext/y-u-no-validate/chrome.manifest is in xul-ext-y-u-no-validate 2013052401-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | content y-u-no-validate jar:chrome/y-u-no-validate.jar!/content/
overlay chrome://pippki/content/exceptionDialog.xul chrome://y-u-no-validate/content/y-u-no-validateOverlay.xul
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