Examine source code of 4chan Image Gallery X

{
  "name": "4chan Image Gallery X",
  "description": "Display 4chan thread as Image Gallery",
  "version": "1.0.1",
  "manifest_version": 3,
  "content_scripts": [
    {
      "matches": [
        "https://boards.4chan.org/*",
        "https://boards.4channel.org/*"
      ],
      "js": [
        "contentScript.js"
      ],
      "css": [
        "myStyles.css"
      ]
    }
  ],
  "options_page": "options.html",
  "icons": {
    "16": "/icons/4chan-16.png",
    "32": "/icons/4chan-32.png",
    "48": "/icons/4chan-48.png",
    "128": "/icons/4chan-128.png"
  },
  "action": {
    "default_popup": "options.html",
    "default_icon": {
      "16": "/icons/4chan-16.png",
      "32": "/icons/4chan-32.png",
      "48": "/icons/4chan-48.png",
      "128": "/icons/4chan-128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@4chan-Image-Gallery-X-FF",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://boards.4chan.org/",
    "https://boards.4channel.org/"
  ]
}