Examine source code of 432Hz & 528Hz Converter for Spotify

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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "432Hz & 528Hz Converter for Spotify",
  "version": "1.0.3",
  "description": "Project no longer supported - Get the NEW and IMPROVED All in One Ultimate 432 Player Extension instead",
  "short_name": "432Hz/528Hz",
  "author": "Appum Studios LTD",
  "action": {
    "default_icon": {
      "32": "icons/logo.png"
    },
    "default_popup": "popup/index.html"
  },
  "icons": {
    "16": "icons/icon16.png",
    "24": "icons/icon24.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "run_at": "document_idle",
      "js": [
        "import-content.js",
        "lib/parse/dist/import-parse.js"
      ],
      "css": [
        "styles.css"
      ],
      "matches": [
        "*://open.spotify.com/*"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "*://open.spotify.com/*"
      ],
      "resources": [
        "styles.css",
        "utils/*.js",
        "models/*.js",
        "events/*.js",
        "components/*.js",
        "components/users/**/*.js",
        "observers/*.js",
        "stores/*.js",
        "actions/*.js",
        "data/*.js",
        "services/*.js",
        "lib/**/*.js",
        "lib/parse/**/*.js",
        "lib/parse/lib/*.js",
        "lib/sounds/*.wav"
      ]
    },
    {
      "resources": [
        "chunks/*-*.js",
        "content.js",
        "lib/parse/dist/parse.js"
      ],
      "matches": [
        "*://open.spotify.com/*",
        "*://*.spotify.com/*"
      ]
    }
  ],
  "commands": {
    "on/off": {
      "description": "Toggle Extension On/Off"
    },
    "loop": {
      "description": "Loop/UnLoop Snip/Track"
    },
    "next": {
      "description": "Next Track"
    },
    "play/pause": {
      "description": "Play/Pause"
    },
    "repeat": {
      "description": "Repeat Track"
    },
    "shuffle": {
      "description": "Shuffle Tracks"
    },
    "previous": {
      "description": "Previous Track"
    },
    "settings": {
      "description": "Display Controls"
    },
    "mute/unmute": {
      "description": "Mute/Unmute Track"
    },
    "seek-fastforward": {
      "description": "Seek Track Forwards"
    },
    "save/unsave": {
      "description": "Save/Unsave Track"
    },
    "seek-rewind": {
      "description": "Seek Track Backwards"
    },
    "block-track": {
      "description": "Add track to block list"
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "activeTab",
    "scripting",
    "webRequest",
    "unlimitedStorage"
  ],
  "host_permissions": [
    "*://*.spotify.com/*"
  ],
  "background": {
    "type": "module",
    "service_worker": "background.js"
  },
  "externally_connectable": {
    "matches": [
      "*://*.google.com/*"
    ]
  }
}