Examine source code of Pixiv Better Discovery

{
  "manifest_version": 3,
  "name": "Pixiv Feed",
  "version": "1.0.1",
  "description": "Discovery: full-size thumbnails, autoplay ugoira, vertical feed layout.",
  "browser_specific_settings": {
    "gecko": {
      "id": "pixiv-feed@local",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.pixiv.net/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "inject.js"
      ],
      "matches": [
        "https://www.pixiv.net/*"
      ]
    }
  ],
  "host_permissions": [
    "https://www.pixiv.net/*",
    "https://i.pximg.net/*"
  ]
}