Examine source code of X Country Block

{
  "manifest_version": 3,
  "name": "X Country Block",
  "version": "0.1.2",
  "description": "Block posts on X from countries, regions, and languages you choose.",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://x.com/*",
    "https://twitter.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "service_worker": "background.js"
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_title": "X Country Block",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "64": "icons/icon64.png",
      "96": "icons/icon96.png"
    },
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://x.com/*",
        "https://www.x.com/*",
        "https://twitter.com/*",
        "https://www.twitter.com/*",
        "https://mobile.twitter.com/*"
      ],
      "js": [
        "hook.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    },
    {
      "matches": [
        "https://x.com/*",
        "https://www.x.com/*",
        "https://twitter.com/*",
        "https://www.twitter.com/*",
        "https://mobile.twitter.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://andreasne89.github.io/x-country-block/privacy.html*"
      ],
      "js": [
        "paid-page.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "x-country-block@andreasne89.github.io",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}