Examine source code of otoDB

{
  "manifest_version": 3,
  "name": "otoDB",
  "version": "1.3.1",
  "description": "otoDB is a community-driven website consisting of a collaborative user-managed database and wiki.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "index.html",
    "default_title": "otoDB"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.nicovideo.jp/*"
      ],
      "js": [
        "niconico.js"
      ]
    },
    {
      "matches": [
        "https://embed.nicovideo.jp/watch/*"
      ],
      "js": [
        "niconico-embed.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    },
    {
      "matches": [
        "https://*.nicovideo.jp/*"
      ],
      "js": [
        "injector.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "https://otodb.net/*"
      ],
      "js": [
        "otodb-prefs.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "injected.js",
        "niconico-embed-injected.js"
      ],
      "matches": [
        "https://*.nicovideo.jp/*"
      ]
    }
  ],
  "permissions": [
    "declarativeNetRequestWithHostAccess",
    "cookies",
    "activeTab",
    "storage"
  ],
  "host_permissions": [
    "https://otodb.net/*",
    "https://*.nicovideo.jp/*",
    "https://*.nicoseiga.jp/*",
    "https://www.nicochart.jp/*"
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ruleset",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{717c1436-7545-4acd-bed8-a473bac7698b}"
    }
  }
}