Examine source code of Spaced Out Dood

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Spaced Out",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg",
        "images/2.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center",
        "right bottom",
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(171, 119, 128, 0.03)",
      "toolbar_text": "rgb(243, 42, 255)",
      "frame": "rgb(8, 2, 1)",
      "tab_background_text": "rgb(99, 7, 155)",
      "toolbar_field": "rgb(34, 35, 35)",
      "toolbar_field_text": "rgb(231, 231, 13)",
      "tab_line": "rgb(85, 242, 41)",
      "popup": "rgb(17, 39, 30)",
      "popup_text": "rgb(197, 78, 235)",
      "tab_loading": "rgb(85, 242, 41)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{43e0c2cd-2e40-4563-b776-8e2af0081156}"
    }
  }
}