Examine source code of rediscool

{
  "name": "red",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "5E2637.png"
    },
    "colors": {
      "frame": "rgba(94, 38, 55, 1)",
      "tab_background_text": "rgba(216, 96, 102, 1)",
      "toolbar": "rgba(17, 19, 21, 1)",
      "toolbar_field": "rgba(216, 96, 102, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dcbeae62-9fb7-47c9-956b-56ed15768d17}"
    }
  }
}