Examine source code of Cross with Corpus

{
  "theme": {
    "images": {
      "theme_frame": "kreuzoben1.png"
    },
    "colors": {
      "frame": "#8f8c8c",
      "tab_background_text": "#080808"
    }
  },
  "version": "2.0",
  "name": "Cross with Corpus",
  "manifest_version": 2,
  "description": "The Cross is made of stainless steel and the Corpus is made of copper"
}