Examine source code of Music Link Helper

{
  "manifest_version": 3,
  "name": "Music Link Helper",
  "version": "1.2.4",
  "description": "Search selected text on Deezer/Apple Music/Spotify and open Album/Song.link (Odesil) or direct platform URLs",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png",
    "256": "icons/icon-256.png"
  },
  "permissions": [
    "contextMenus",
    "storage",
    "notifications",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    }
  },
  "commands": {
    "search-selected": {
      "suggested_key": {
        "default": "Ctrl+Shift+L"
      },
      "description": "Search selected text (Music Link Helper)"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentScript.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "music-link-helper@chr1sx",
      "strict_min_version": "109.0"
    }
  }
}