incognito external redirect

app.js

const getLink = node => {
  if (!node) {
    return undefined
  }

  return node.href ? node : getLink(node.parentNode)
}


const onClick = e => {
  const link = getLink(e.target)

  if (!link) {
    return
  }

  e.preventDefault()

  chrome.runtime.sendMessage({
    action: 'CREATE_INCOGNITO_WINDOW',
    url: link.href
  })
}

document.addEventListener('DOMContentLoaded', () => {

  if (document.location.href.indexOf('/external_redirect') == -1) {
    return
  }

  var element = document.querySelectorAll(".block-external-redirect  a");
  if (element[0]) {
    element[0].onclick = onClick
  }

})

background.js

chrome.runtime.onMessage.addListener(({ action, url }) => {
  if (action === 'CREATE_INCOGNITO_WINDOW') {
    chrome.windows.create({
      url,
      incognito: true
    })
  }
})

manifest.json

{
  "name": "incognito external redirect",
  "description": "Open a link in Incognito mode from external redirect page",
  "manifest_version": 2,
  "version": "0.0.2",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "app.js"
      ],
      "run_at": "document_start"
    }
  ]
}