Examine source code of Marble Green

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "MarbleG",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(1, 13, 8, 0.57)",
      "toolbar_text": "rgb(199, 251, 229)",
      "frame": "rgb(3, 26, 17)",
      "tab_background_text": "rgb(207, 248, 243)",
      "toolbar_field": "rgba(19, 18, 18, 0.45)",
      "toolbar_field_text": "rgb(176, 232, 225)",
      "tab_line": "rgb(2, 230, 137)",
      "popup": "rgba(1, 34, 19, 0.94)",
      "popup_text": "rgb(252, 242, 207)",
      "button_background_active": "rgb(19, 135, 86)",
      "button_background_hover": "rgb(15, 74, 49)",
      "frame_inactive": "rgb(0, 0, 0)",
      "icons_attention": "rgb(255, 241, 194)",
      "icons": "rgb(130, 255, 188)",
      "ntp_background": "rgb(0, 0, 0)",
      "ntp_text": "rgb(255, 241, 194)",
      "popup_border": "rgb(2, 230, 137)",
      "popup_highlight_text": "rgb(255, 241, 194)",
      "popup_highlight": "rgb(7, 30, 11)",
      "sidebar_border": "rgb(2, 230, 137)",
      "sidebar_highlight_text": "rgb(255, 241, 194)",
      "sidebar_highlight": "rgba(1, 34, 19, 0.77)",
      "sidebar_text": "rgb(187, 238, 232)",
      "sidebar": "rgb(1, 13, 8)",
      "tab_loading": "rgb(255, 241, 194)",
      "tab_selected": "rgba(0, 23, 2, 0.77)",
      "tab_text": "rgb(252, 242, 211)",
      "toolbar_bottom_separator": "rgb(0, 136, 81)",
      "toolbar_field_border_focus": "rgb(4, 191, 113)",
      "toolbar_field_border": "rgb(0, 136, 81)",
      "toolbar_field_focus": "rgba(7, 30, 11, 0.96)",
      "toolbar_field_highlight_text": "rgb(32, 38, 4)",
      "toolbar_field_highlight": "rgb(210, 196, 121)",
      "toolbar_field_separator": "rgb(6, 4, 0)",
      "toolbar_field_text_focus": "rgb(255, 241, 194)",
      "toolbar_top_separator": "rgb(4, 90, 55)",
      "toolbar_vertical_separator": "rgb(126, 255, 201)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{232eaf43-773f-4c72-9c6d-ad4f092df375}"
    }
  }
}