chrome-extensionExecute code when extension is installed in Chrome.

chrome.runtime.onInstalled.addListener(function(d) {
  if ( d.reason == "install" ) {
    console.log('installed');
  }
  else if ( d.reason == "update" ) {
    console.log('updated');
  }
});ctrl + cyoutubegithub

`onInstalled.addListener` listen to installation event	`d.reason` contains `install` if this is a new installation or `update` if extension is installed already and just being updated
`console.log('installed')` execute this code when extension is freshly installed	`console.log('updated')` execute this code if extension is installed already and has been just updated

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