Examine source code of Malicious Url Detector

{
  "manifest_version": 2,
  "background": {
    "scripts": [
      "popup.js"
    ],
    "persistent": true
  },
  "name": "Malicious Url Detector",
  "description": "Malicious Url Detector",
  "version": "1.0.0",
  "icons": {
    "128": "anti.png"
  },
  "browser_action": {
    "default_icon": "anti.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "https://detecturl.herokuapp.com/",
    "storage",
    "tabs",
    "activeTab",
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "https://*/"
  ]
}