Examine source code of Sunset in Cologne

{
  "name": "Sunset in Cologne",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "IMG_20220810_204850__01.jpg"
    },
    "colors": {
      "frame": "rgba(94, 175, 204, 0.82)",
      "tab_background_text": "rgba(255, 86, 8, 1)",
      "toolbar": "rgba(62, 118, 135, 0.88)",
      "bookmark_text": "rgba(35, 98, 161, 1)",
      "toolbar_field": "rgba(255, 89, 0, 0.62)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(255, 81, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{747cfd9e-bce5-429a-812b-d6457fd3e8d2}"
    }
  }
}