Examine source code of SingAlong Overlay

{
  "manifest_version": 3,
  "name": "SingAlong Overlay",
  "description": "Displays real-time, synchronized lyrics in a customizable floating window over any music or video platform.",
  "version": "1.0.0",
  "author": "SonicLayer Studio",
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "https://*.spotify.com/*",
    "https://*.youtube.com/*",
    "https://*.music.apple.com/*",
    "https://*.soundcloud.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "singalongoverlay@soniclayerstudio.addons.mozilla.org",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}