Examine source code of Red with Blue

{
  "name": "Red with Blue",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "Unbenannt.png"
    },
    "colors": {
      "frame": "rgb(121, 21, 23)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgb(43, 206, 227)",
      "bookmark_text": "rgba(12, 12, 13, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0.53)",
      "toolbar_field_text": "rgb(0, 0, 0)"
    }
  }
}