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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def moz_info(self):
 """Return the build's mozinfo"""

        if 'moz_info' not in self._memo:
            self._memo['moz_info'] = _get_url(self.artifact_url('mozinfo.json')).json()
        return self._memo['moz_info']