docs: def validate_name(err, value, source):
      'Tests a manifest name value for trademarks.'
  
      ff_pattern = re.compile('(mozilla|firefox)', re.I)
  
      err.metadata['name'] = value
  
      if ff_pattern.search(value):
          err.warning(
              ('metadata_helpers', '_test_name', 'trademark'),
              'Add-on has potentially illegal name.',
              'Add-on names cannot contain the Mozilla or Firefox '
              'trademarks. These names should not be contained in add-on '
              'names if at all possible.',
              source)