Examine source code of Spotranslate

{
  "manifest_version": 3,
  "name": "Spotranslate",
  "description": "Translate Spotify lyrics.",
  "version": "0.1.0",
  "action": {
    "default_popup": "spotranslate-popup.html",
    "default_icon": "images/icon-128.png"
  },
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "64": "images/icon-64.png",
    "128": "images/icon-128.png"
  },
  "content_scripts": [
    {
      "css": [
        "spotranslate.css"
      ],
      "js": [
        "spotranslate.js"
      ],
      "matches": [
        "https://open.spotify.com/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "spotranslate-background.js"
    ]
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://translate.googleapis.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{75dca8c7-97da-4b30-87b5-00e1779659f0}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}