Examine source code of Personalized Twitter

{
  "manifest_version": 2,
  "name": "Personalized Twitter",
  "version": "1.1.0",
  "description": "Allows you to enable/disable certain Twitter features.",
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*",
        "*://*.x.com/*"
      ],
      "js": [
        "index.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dbed0f7a-5ece-43e5-9ad1-a31b17d4af0e}"
    }
  }
}