Examine source code of Sail by Sunset

{
  "name": "Sail by Sunset",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "sailboatSunsetH.jpg"
    },
    "colors": {
      "frame": "rgba(38, 17, 1, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(38, 17, 1, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(38, 17, 1, 0.05)",
      "toolbar_field_text": "rgba(255, 237, 138, 1)",
      "tab_line": "rgba(255, 237, 138, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{533a2c77-0bc3-42fb-92f0-a264e94c7224}"
    }
  }
}