Examine source code of Keep Video Playing

{
  "manifest_version": 3,
  "name": "Keep Video Playing",
  "version": "1.0.0",
  "description": "Keep videos playing when switching tabs or losing focus.",
  "permissions": [
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "keep-video-playing@playtime.extension",
      "strict_min_version": "121.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "visibility-patch.js"
      ],
      "run_at": "document_start",
      "world": "MAIN",
      "all_frames": true
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "bridge.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ]
}