Examine source code of Timestamp Notes

{
  "manifest_version": 3,
  "name": "Timestamp Notes",
  "version": "1.0.0",
  "description": "Take timestamped notes while watching videos. Everything stays on your device: no account, no server, no tracking.",
  "browser_specific_settings": {
    "gecko": {
      "id": "timestamp-notes@redbrickroadstudio.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "scripting",
    "clipboardWrite"
  ],
  "optional_host_permissions": [
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "shared/lib.js",
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "shared/lib.js",
        "content/content.js"
      ],
      "css": [
        "content/overlay.css"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "action": {
    "default_title": "Timestamp Notes",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "48": "icons/icon.svg",
      "96": "icons/icon.svg"
    }
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "options_ui": {
    "page": "pages/options.html",
    "open_in_tab": true
  },
  "commands": {
    "create-note": {
      "suggested_key": {
        "default": "Alt+Shift+N"
      },
      "description": "Create a timestamped note for the current video"
    }
  }
}