Examine source code of CommentSync - Real-time YouTube Comments

{
  "manifest_version": 3,
  "name": "CommentSync - Real-time YouTube Comments",
  "description": "Sync YouTube comments with video playback. See reactions and timestamps appear automatically as you watch.",
  "version": "1.0.3",
  "permissions": [
    "storage",
    "declarativeNetRequestWithHostAccess",
    "tabs"
  ],
  "host_permissions": [
    "https://*.youtube.com/"
  ],
  "action": {
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "kbpgpkfoengiobcokbjidbnjldjldboj@motade.ext.commentsync",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {}
  },
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ruleset_1",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  },
  "icons": {
    "48": "icons/48x48.png",
    "96": "icons/96x96.png"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.youtube.com/*"
      ],
      "all_frames": true,
      "js": [
        "content/content.js"
      ],
      "css": [
        "content/content.css"
      ]
    }
  ]
}