Examine source code of witte walvis

{
  "theme": {
    "images": {
      "theme_frame": "beluga-header.jpg"
    },
    "colors": {
      "frame": "#0062ff",
      "tab_background_text": "#0062ff"
    }
  },
  "version": "2.0",
  "name": "witte walvis",
  "manifest_version": 2,
  "description": "hoi"
}