Examine source code of x-zombie-killer

{
  "manifest_version": 2,
  "name": "x-zombie-killer",
  "version": "2.2.2",
  "permissions": [
    "storage",
    "alarms",
    "https://api.itokoba.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://twitter.com/*",
        "https://x.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon-48.png"
  },
  "options_page": "options.html",
  "icons": {
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "x-zomboie-killer@kdroidwin.com",
      "strict_min_version": "126.0"
    }
  }
}