Examine source code of Derrick's C. Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Derrick's C. Theme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(239, 225, 234)",
      "toolbar_text": "rgb(41, 19, 241)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(128, 204, 123)",
      "tab_line": "rgb(226, 18, 142)",
      "popup": "rgba(251, 248, 255, 0.95)",
      "popup_text": "rgb(98, 183, 101)",
      "tab_loading": "rgb(226, 18, 142)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{716ea756-a303-4bbc-b0fe-a81e62410b8e}"
    }
  }
}