Examine source code of In the ocean

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "In the sea",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 58, 82, 0.25)",
      "toolbar_text": "rgb(209, 255, 200)",
      "frame": "rgb(0, 58, 82)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(255, 249, 220, 0.75)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(255, 122, 0)",
      "popup": "rgb(236, 228, 197)",
      "popup_text": "rgb(14, 0, 132)",
      "tab_loading": "rgb(255, 122, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8372d599-d32e-4fb9-924f-bbef12ba39f9}"
    }
  }
}