code: function createLogger(prefix, maxLogLevelPref, maxLogLevel = "warn") {
    const ConsoleAPI = ChromeUtils.import(
      "resource://gre/modules/Console.jsm",
      {},
    ).ConsoleAPI;
    return new ConsoleAPI({
      prefix,
      maxLogLevelPref,
      maxLogLevel,
    });
  }
docs: Creates a logger for debugging.
  
  The pref to control this is "shieldStudy.logLevel"
  
  @param {string} prefix - a prefix string to be printed before
  the actual logged message
  @param {string} maxLogLevelPref - String pref name which contains the
  level to use for maxLogLevel
  @param {string} maxLogLevel - level to use by default, see LOG_LEVELS in gre/modules/Console.jsm
  @returns {Object} - the Console instance, see gre/modules/Console.jsm