Examine source code of Sweet Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Sweet Dark",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(22, 25, 37)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(12, 14, 20)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(24, 27, 40)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(32, 36, 53)",
      "popup": "rgb(22, 25, 37)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(32, 36, 53)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{92ca3113-d61d-4765-be4f-0a6533c4dd94}"
    }
  }
}