code: def ExamineEvent(self, mediator, event):
      
      # Only interested in filesystem events.
      if event.data_type != 'fs:stat':
        return
  
      filename = getattr(event, 'filename', None)
      if not filename:
        return
  
      # Determine if we have a Chrome extension ID.
      if 'chrome' not in filename.lower():
        return
  
      if not self._sep:
        self._sep = self._GetPathSegmentSeparator(filename)
  
      if '{0:s}Extensions{0:s}'.format(self._sep) not in filename:
        return
  
      # Now we have extension IDs, let's check if we've got the
      # folder, nothing else.
      paths = filename.split(self._sep)
      if paths[-2] != 'Extensions':
        return
  
      extension_identifier = paths[-1]
      if extension_identifier == 'Temp':
        return
  
      # Get the user and ID.
      user = mediator.GetUsernameForPath(filename)
  
      # We still want this information in here, so that we can
      # manually deduce the username.
      if not user:
        if len(filename) > 25:
          user = 'Not found ({0:s}...)'.format(filename[0:25])
        else:
          user = 'Not found ({0:s})'.format(filename)
  
      extension_string = self._GetTitleFromChromeWebStore(extension_identifier)
      if not extension_string:
        extension_string = extension_identifier
  
      self._results.setdefault(user, [])
      if (extension_string, extension_identifier) not in self._results[user]:
        self._results[user].append((extension_string, extension_identifier))
docs: Analyzes an event.
  
      Args:
        mediator (AnalysisMediator): mediates interactions between analysis
            plugins and other components, such as storage and dfvfs.
        event (EventObject): event to examine.