text: chrome.runtime.onInstalled.addListener(function() {
      chrome.declarativeContent.onPageChanged.removeRules(undefined, function() {
        chrome.declarativeContent.onPageChanged.addRules([{
          conditions: [new chrome.declarativeContent.PageStateMatcher({
            pageUrl: {hostContains: ''},
          })
          ],
              actions: [new chrome.declarativeContent.ShowPageAction()]
        }]);
      });
    });