Examine source code of AntiPHP web theme

{
  "manifest_version": 2,
  "name": "AntiPHP web theme",
  "version": "0.0.2resigned1",
  "description": "Dark theme for google.de",
  "author": "Christian Reinecke <christian.reinecke@web.de>",
  "homepage_url": "https://github.com/antiphp/web_theme",
  "applications": {
    "gecko": {
      "id": "web-theme@antiphp.net"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.google.de/*"
      ],
      "css": [
        "google.min.css"
      ]
    }
  ]
}