Examine source code of Please @ (At) Me

{
  "manifest_version": 2,
  "name": "Plz @ Me",
  "version": "1.3.3",
  "permissions": [
    "https://news.ycombinator.com/item*",
    "https://news.ycombinator.com/threads*",
    "https://*.plzat.me/*",
    "https://db.plzat.me/*",
    "https://hacker-news.firebaseio.com/*",
    "storage"
  ],
  "browser_action": {
    "default_popup": "public/browser_action.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://news.ycombinator.com/item*",
        "https://news.ycombinator.com/threads*",
        "https://*.plzat.me/*",
        "https://db.plzat.me/*",
        "https://hacker-news.firebaseio.com/*"
      ],
      "js": [
        "public/build/injection.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@plzat.me"
    }
  }
}