Examine source code of Music Bar

{
  "manifest_version": 3,
  "name": "Music Bar",
  "version": "1.0.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "music-bar@Porfekto.dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "assets/background.js-BFmWQhn-.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "js": [
        "assets/content.jsx-DhwxXqfI.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "all_frames": false
    },
    {
      "js": [
        "assets/youtube.js-B1ZEN8DO.js"
      ],
      "matches": [
        "*://music.youtube.com/*"
      ]
    },
    {
      "js": [
        "assets/spotify.js-D_j7iI9b.js"
      ],
      "matches": [
        "*://*.spotify.com/*"
      ]
    }
  ],
  "permissions": [
    "storage",
    "tabs",
    "scripting"
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "assets/content.jsx-DhwxXqfI.js"
      ],
      "use_dynamic_url": false
    },
    {
      "matches": [
        "*://music.youtube.com/*"
      ],
      "resources": [
        "assets/youtube.js-B1ZEN8DO.js"
      ],
      "use_dynamic_url": false
    },
    {
      "matches": [
        "*://*.spotify.com/*"
      ],
      "resources": [
        "assets/spotify.js-D_j7iI9b.js"
      ],
      "use_dynamic_url": false
    }
  ]
}