如何不点击就启用chrome扩展。
我需要从我的扩展执行某个功能，每次我重新加载一个页面（没有点击）有办法做到这一点。
我的代码，其中包含on click方法

chrome.extension.onMessage.addListener(function(request, sender) {
  if (request.action == "getSource") {
    message.innerText = request.source;
  }
});

function onWindowLoad() {

  var message = document.querySelector('#message');

  chrome.tabs.executeScript(null, {
    file: "getPagesSource.js"
  }, function() {
    // If you try and inject into an extensions page or the webstore/NTP you'll get an error
    if (chrome.extension.lastError) {
      message.innerText = 'There was an error injecting script : \n' + chrome.extension.lastError.message;
    }
  });

}

window.onload = onWindowLoad;

以及

chrome.extension.sendMessage({
    action: "getSource",
    source: started(document)
});