Examine source code of Lichess Sound Control

{
  "manifest_version": 2,
  "name": "Lichess Sound Control",
  "version": "1.2.0",
  "description": "Per-effect sound toggles and separate themes for white and black on lichess.org.",
  "browser_specific_settings": {
    "gecko": {
      "id": "lichess-sound-control@local.dev",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "*://lichess.org/*",
    "*://*.lichess.org/*",
    "https://raw.githubusercontent.com/*",
    "https://cdn.jsdelivr.net/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Lichess Sound Control — click to configure",
    "default_popup": "options/options.html"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://lichess.org/*",
        "*://*.lichess.org/*"
      ],
      "js": [
        "content/bridge.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://lichess.org/*",
        "*://*.lichess.org/*"
      ],
      "js": [
        "content/patch.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    }
  ]
}