Examine source code of FireSpaceBlue

{
  "name": "FireSky",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "colores-del-arcoiris-6186 (2).jpg"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 0.01)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(255, 255, 255, 0.16)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0.18)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 0.08)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{56ea208e-3641-4e9c-a06d-b5ff470793f6}"
    }
  }
}