Examine source code of Tab Audio Recorder

{
  "manifest_version": 3,
  "name": "Tab Audio Recorder",
  "version": "0.1.1",
  "description": "Record audio from browser tabs for sampling",
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg",
    "128": "icons/icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{85d5f6d2-781f-4d99-bc63-921882f36523}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "webRequest",
    "webNavigation",
    "storage",
    "downloads"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background/index.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/AudioContextHook.js",
        "content/MediaElementHook.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "world": "MAIN"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/index.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "action": {
    "default_popup": "popup/index.html",
    "default_icon": {
      "48": "icons/icon.svg",
      "96": "icons/icon.svg"
    }
  },
  "options_ui": {
    "page": "app/index.html",
    "open_in_tab": true
  },
  "commands": {
    "record-toggle": {
      "suggested_key": {
        "default": "Alt+Shift+R"
      },
      "description": "Record/stop the active tab; if nothing is playing yet, arm the next playback"
    }
  }
}