Examine source code of Dark blue Hexagons

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Hexagons",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 30, 128, 0.5)",
      "toolbar_text": "rgb(202, 202, 202)",
      "frame": "rgb(32, 32, 32)",
      "tab_background_text": "rgb(228, 228, 228)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(0, 255, 145)",
      "popup": "rgb(214, 223, 255)",
      "popup_text": "rgb(0, 30, 128)",
      "tab_loading": "rgb(0, 255, 145)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0a533e44-48e0-4cdf-a646-e5d7f217bedd}"
    }
  }
}