Examine source code of Cosmic landscape

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Cosmic landscape",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(3, 28, 74, 0.5)",
      "toolbar_text": "rgb(212, 245, 255)",
      "frame": "rgb(0, 23, 51)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(255, 255, 255, 0.5)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(255, 186, 141)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(243, 228, 207)",
      "ntp_background": "rgba(7, 24, 56, 0.5)",
      "ntp_text": "rgb(243, 228, 207)",
      "tab_loading": "rgb(255, 186, 141)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9a8d29f3-8949-48b4-912e-103118d4c2e6}"
    }
  }
}