Examine source code of Superthorisb's theme

{
  "name": "Gaming Theme",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Supar.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(227, 3, 3, 1)",
      "toolbar": "rgba(240, 20, 12, 0.41)",
      "bookmark_text": "rgba(66, 162, 245, 1)",
      "toolbar_field": "rgba(10, 204, 101, 0.26)",
      "toolbar_field_text": "rgba(255, 15, 247, 1)",
      "tab_line": "rgba(3, 247, 60, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{db785276-5ff8-4e7d-8fb3-c28d8960d0dc}"
    }
  }
}