Examine source code of Twitter Bird

{
  "manifest_version": 3,
  "name": "Twitter Bird",
  "description": "Extension which returns the Twitter bird icon back",
  "version": "1.2",
  "action": {
    "default_icon": "images/icon_512.png"
  },
  "content_scripts": [
    {
      "js": [
        "scripts/content.js"
      ],
      "css": [
        "content.css"
      ],
      "matches": [
        "https://twitter.com/*",
        "https://x.com/*"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "images/*"
      ],
      "matches": [
        "https://twitter.com/*",
        "https://x.com/*"
      ]
    }
  ],
  "icons": {
    "16": "images/icon_16.png",
    "32": "images/icon_32.png",
    "48": "images/icon_48.png",
    "128": "images/icon_128.png",
    "512": "images/icon_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "kostyaxxx8@gmail.com",
      "strict_min_version": "42.0"
    }
  },
  "permissions": [
    "activeTab",
    "tabs"
  ]
}