Examine source code of Ciel étoilé

{
  "name": "Ciel étoilé",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "ciel étoilé.png"
    },
    "colors": {
      "toolbar_field": "rgba(19, 211, 240, 0.43)",
      "toolbar_field_text": "rgba(255, 255, 255, 0.7)",
      "frame": "rgba(255, 255, 255, 0)",
      "tab_background_text": "rgba(65, 22, 240, 1)",
      "bookmark_text": "rgba(19, 211, 240, 0.43)"
    }
  }
}