Examine source code of Zenbox

{
  "manifest_version": 2,
  "name": "Zenbox",
  "description": "Fusion of Zen browser and Gruvbox color palettes",
  "version": "2.1",
  "theme": {
    "colors": {
      "frame": "#252525",
      "frame_inactive": "#252525",
      "toolbar": "#363636",
      "toolbar_top_separator": "#363636",
      "toolbar_vertical_separator": "#a89984",
      "toolbar_bottom_separator": "#363636",
      "tab_background_separator": "#1f1f1f",
      "tab_background_text": "#d2c6b8",
      "tab_text": "#f7ebe5",
      "tab_line": "#f76f53",
      "tab_loading": "#f76f53",
      "bookmark_text": "#f7ebe5",
      "sidebar": "#252525",
      "sidebar_text": "#f7ebe5",
      "sidebar_highlight_text": "#1f1f1f",
      "sidebar_highlight": "#f76f53",
      "sidebar_border": "#f76f53",
      "toolbar_field": "#1f1f1f",
      "toolbar_field_focus": "#1f1f1f",
      "toolbar_field_border": "#252525",
      "toolbar_field_border_focus": "#f76f53",
      "toolbar_field_highlight": "#458588",
      "toolbar_field_highlight_text": "#f7ebe5",
      "toolbar_field_text": "#d2c6b8",
      "toolbar_field_text_focus": "#f7ebe5",
      "popup": "#1f1f1f",
      "popup_text": "#f7ebe5",
      "popup_border": "#1f1f1f",
      "popup_highlight": "#f76f53",
      "popup_highlight_text": "#1f1f1f",
      "ntp_background": "#252525",
      "ntp_text": "#f7ebe5"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5e9974ad-5a0a-430a-91ed-07f78df5ebec}"
    }
  }
}