Examine source code of Auto HTTPS Redirect

{
  "manifest_version": 2,
  "name": "Auto HTTPS Redirect",
  "version": "1.0",
  "description": "Tự động chuyển hướng HTTP sang HTTPS nếu khả dụng.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "auto-https-redirect@example.com"
    }
  }
}