Examine source code of Nightlight Profile View

{
  "name": "Nightlight",
  "version": "0.0.1",
  "manifest_version": 2,
  "description": "This browser extension allows you to view your profile activity instantly ",
  "homepage_url": "https://github.com/iTenerai/nightlight-extension",
  "icons": {
    "38": "img/icon38.png",
    "128": "img/icon128.png"
  },
  "author": "iTenerai",
  "content_security_policy": "script-src 'self' https://api.night-light.cz; object-src 'self'",
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Nightlight Activity"
  },
  "permissions": [
    "cookies",
    "https://night-light.cz/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{deea2de1-35a6-432a-904e-62ccf08ae2e6}"
    }
  }
}