Examine source code of Allerseelen

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#89b0a2"
    }
  },
  "version": "2.0",
  "name": "Allerseelen",
  "manifest_version": 2,
  "description": "A Forest with an eerie green light shining through the trees."
}