Examine source code of Montain dessin

{
  "name": "red and black",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Marmotamaps_Wallpaper_Berchtesgaden_Desktop_1920x1080.jpg"
    },
    "colors": {
      "frame": "rgba(230, 250, 245, 0.97)",
      "tab_background_text": "rgba(0, 0, 0, 1)"
    }
  }
}