Examine source code of Clean Space Dark

{
  "name": "Clean Space Dark",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "space.jpg"
    },
    "colors": {
      "frame": "rgba(38, 38, 38, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(74, 70, 94, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(38, 38, 38, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e6d0c820-dbcf-4da8-8594-961ef7df20b6}"
    }
  }
}