Examine source code of evil-summon

{
  "theme": {
    "images": {
      "theme_frame": "Perso_guro_1__Kopf.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ff6a00"
    }
  },
  "version": "2.0",
  "name": "evil-summon",
  "manifest_version": 2
}