Examine source code of Caption Scribe

{
  "manifest_version": 3,
  "name": "Caption Scribe",
  "version": "0.1.1",
  "description": "Export the captions of a YouTube video as clean, readable Markdown.",
  "browser_specific_settings": {
    "gecko": {
      "id": "caption-scribe@jerichoapo",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "downloads"
  ],
  "host_permissions": [
    "*://*.youtube.com/*"
  ],
  "action": {
    "default_title": "Caption Scribe",
    "default_popup": "src/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": "src/options/options.html",
    "open_in_tab": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "src/content/interceptor.js"
      ],
      "run_at": "document_start",
      "world": "MAIN",
      "all_frames": false
    },
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "src/content/selectors.js",
        "src/content/bridge.js",
        "src/content/playerResponse.js",
        "src/content/videoMeta.js",
        "src/content/transcriptPanel.js",
        "src/content/acquire.js",
        "src/content/index.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y"
      },
      "description": "Open Caption Scribe"
    }
  }
}