Examine source code of Dark Slate Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Slate",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(31, 32, 37)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(18, 19, 23)",
      "tab_background_text": "rgb(207, 207, 207)",
      "toolbar_field": "rgb(54, 55, 62)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(255, 255, 255, 0.12)",
      "popup": "rgb(31, 32, 37)",
      "popup_text": "rgb(255, 255, 255)",
      "popup_border": "rgba(255, 255, 255, 0.12)",
      "tab_loading": "rgba(255, 255, 255, 0.12)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e2a5caf4-3c1c-4ca0-86f0-a73e3886e0a2}"
    }
  }
}