message: Added extension installation hook
diff: @@ -150,6 +150,9 @@ chrome.runtime.onInstalled.addListener(({previousVersion}) => {
  // 5.3 added
  config.dicts.all.howjsay = defaultConfig.dicts.all.howjsay
  }
  + if (minor < 5) {
  + config.dicts.all.eudic = defaultConfig.dicts.all.eudic
  + }
  } else {
  config = defaultConfig
  }
  