Examine source code of Green Falling Galaxy

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Green Falling Galaxy",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg",
        "images/2.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center",
        "center center",
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(2, 2, 20, 0.8)",
      "toolbar_text": "rgb(115, 255, 169)",
      "frame": "rgb(42, 44, 46)",
      "tab_background_text": "rgb(5, 255, 0)",
      "toolbar_field": "rgba(2, 2, 20, 0.8)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(115, 255, 169)",
      "popup": "rgb(0, 47, 75)",
      "popup_text": "rgb(5, 255, 0)",
      "button_background_hover": "rgb(0, 47, 75)",
      "icons_attention": "rgb(5, 255, 0)",
      "popup_border": "rgb(5, 255, 0)",
      "tab_loading": "rgb(115, 255, 169)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fcd52404-2cb6-4106-a07d-740402336155}"
    }
  }
}