Examine source code of The Blackout Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "The Blackout",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(241, 243, 246)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(224, 228, 232)",
      "toolbar_field": "rgba(80, 82, 85, 0.53)",
      "toolbar_field_text": "rgb(240, 240, 240)",
      "tab_line": "rgb(100, 100, 100)",
      "popup": "rgb(39, 39, 39)",
      "popup_text": "rgb(84, 84, 84)",
      "tab_loading": "rgb(100, 100, 100)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8f5f0002-8de2-491e-a7ee-dfd701769c66}"
    }
  }
}