Examine source code of Clean Focus Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Clean Fokus dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(117, 117, 117, 0.15)",
      "toolbar_text": "rgb(201, 205, 214)",
      "frame": "rgb(36, 36, 41)",
      "tab_background_text": "rgb(192, 195, 203)",
      "toolbar_field": "rgba(255, 255, 255, 0.1)",
      "toolbar_field_text": "rgb(171, 173, 180)",
      "tab_line": "rgba(36, 36, 41, 0)",
      "popup": "rgb(36, 36, 41)",
      "popup_text": "rgb(190, 193, 200)",
      "ntp_background": "rgb(255, 255, 255)",
      "tab_loading": "rgba(36, 36, 41, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f279ea16-18da-4941-bdd5-52798c11abdc}"
    }
  }
}