Examine source code of Light Decay

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Light Decay",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(222, 225, 230)",
      "toolbar_text": "rgb(16, 20, 25)",
      "frame": "rgb(207, 210, 215)",
      "tab_background_text": "rgb(16, 20, 25)",
      "toolbar_field": "rgb(217, 220, 225)",
      "toolbar_field_text": "rgb(16, 20, 25)",
      "tab_line": "rgb(146, 213, 155)",
      "popup": "rgb(212, 215, 220)",
      "popup_text": "rgb(16, 20, 25)",
      "tab_loading": "rgb(146, 213, 155)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{18232b4c-650d-42ff-a002-f14c89cc1462}"
    }
  }
}