Examine source code of Gabubu

{
  "manifest_version": 2,
  "version": "2.2",
  "name": "Gabubu",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-001-9c6d74e14860e77ee6f8f43e824bff25.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 12, 142)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 6, 63)",
      "tab_background_text": "rgb(216, 216, 216)",
      "toolbar_field": "rgb(0, 11, 111)",
      "toolbar_field_text": "rgb(235, 235, 235)",
      "tab_line": "rgb(0, 21, 245)",
      "popup": "rgb(0, 4, 51)",
      "popup_text": "rgb(219, 219, 219)",
      "button_background_active": "rgba(7, 0, 22, 0.6)",
      "button_background_hover": "rgba(0, 0, 0, 0.3)",
      "frame_inactive": "rgb(0, 9, 85)",
      "icons_attention": "rgb(0, 255, 250)",
      "icons": "rgb(232, 232, 232)",
      "ntp_background": "rgb(4, 10, 74)",
      "popup_highlight": "rgb(42, 51, 155)",
      "sidebar_border": "rgb(85, 85, 85)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgb(0, 7, 108)",
      "sidebar_text": "rgb(227, 227, 227)",
      "sidebar": "rgb(0, 12, 142)",
      "tab_loading": "rgb(0, 21, 245)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{388b1757-b4d3-4137-8759-9ffd5ee96216}"
    }
  }
}