Examine source code of Glattalp

{
  "name": "Glattalp",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Glattalpsee 001 - Kopie 0001 - Kopie (1250x242).jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{93bec72f-7684-428e-8466-50c11f67e9e3}"
    }
  }
}