Examine source code of Amazing Github

{
  "manifest_version": 2,
  "name": "Amazing Github",
  "description": "Customize github contributions graph picked randomly and background by User selection",
  "version": "1.1resigned1",
  "icons": {
    "48": "icons/logo_48.png",
    "64": "icons/logo_64.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/logo_64.png",
    "default_title": "Amazing Github",
    "default_popup": "index.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*"
      ],
      "js": [
        "jquery.slim.min.js",
        "script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e10c73c3-545a-4ec8-b241-1d5fbc900602}"
    }
  }
}