Examine source code of darkerQuantum

{
  "manifest_version": 2,
  "name": "darkerQuantum",
  "author": "Golga",
  "applications": {
    "gecko": {
      "id": "darkerQuantum@oyana.org",
      "strict_min_version": "57.0a1"
    }
  },
  "description": "Firefox Quantum darker theme for UI & website.\n\r ",
  "homepage_url": "https://github.com/Oyana/darkerQuantum",
  "version": "1.0.1resigned1",
  "browser_action": {
    "default_icon": "img/ico/icon-128.png",
    "default_title": "darkerQuantumSettings"
  },
  "icons": {
    "16": "img/ico/icon-16.png",
    "32": "img/ico/icon-32.png",
    "48": "img/ico/icon-48.png",
    "64": "img/ico/icon-64.png",
    "96": "img/ico/icon-96.png",
    "128": "img/ico/icon-128.png"
  },
  "permissions": [
    "http://*/*",
    "https://*/*",
    "<all_urls>",
    "alarms",
    "activeTab",
    "tabs",
    "storage",
    "theme"
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "options_ui": {
    "page": "html/options.html",
    "browser_style": true
  }
}