Examine source code of seaglass

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "seaglass",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(53, 55, 66)",
      "tab_background_text": "rgb(164, 164, 164)",
      "toolbar_field": "rgba(54, 58, 89, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(255, 255, 255, 0)",
      "popup": "rgb(9, 14, 36)",
      "popup_text": "rgb(215, 226, 239)",
      "button_background_hover": "rgb(8, 14, 35)",
      "ntp_background": "rgb(9, 14, 36)",
      "ntp_text": "rgb(221, 221, 221)",
      "popup_border": "rgba(169, 169, 169, 0.04)",
      "sidebar_border": "rgba(255, 255, 255, 0.02)",
      "sidebar": "rgb(9, 14, 36)",
      "tab_selected": "rgba(255, 255, 255, 0.18)",
      "toolbar_field_border_focus": "rgba(255, 255, 255, 0)",
      "toolbar_field_focus": "rgba(9, 14, 36, 0.96)",
      "toolbar_field_highlight_text": "rgb(181, 181, 181)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgba(0, 0, 0, 0)",
      "tab_loading": "rgba(255, 255, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{99bc876d-f100-4bf8-b2a2-30d1d0fd74bd}"
    }
  }
}