Examine source code of VocaLini

{
  "background": {
    "scripts": [
      "./background.js"
    ]
  },
  "manifest_version": 2,
  "description": "Listen to the internet! Turn any article or pdf into a podcast.",
  "name": "VocaLini",
  "permissions": [
    "storage",
    "webRequest",
    "tabs",
    "browsingData",
    "webNavigation",
    "cookies",
    "http://localhost:5000/api",
    "https://app.gutsyscience.com/api",
    "*://*.vocalini.com/*",
    "http://localhost:5000/*",
    "<all_urls>"
  ],
  "version": "0.1",
  "browser_action": {
    "default_icon": {
      "48": "images/logo192.png",
      "128": "images/logo512.png"
    },
    "default_title": "Vocalini"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "all_frames": false,
      "js": [
        "content-script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "icons": {
    "48": "images/logo192.png",
    "128": "images/logo512.png"
  },
  "web_accessible_resources": [
    "*.map*",
    "/img/*.svg"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a2b65489-41d0-4f05-88eb-30465dcbf6b3}"
    }
  }
}