Examine source code of Htnys

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "htnys",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(31, 31, 32)",
      "toolbar_text": "rgb(255, 50, 105)",
      "frame": "rgb(31, 31, 32)",
      "tab_background_text": "rgb(144, 144, 146)",
      "toolbar_field": "rgb(18, 18, 18)",
      "toolbar_field_text": "rgb(160, 160, 223)",
      "tab_line": "rgb(255, 50, 105)",
      "popup": "rgb(27, 27, 28)",
      "popup_text": "rgb(165, 219, 253)",
      "button_background_active": "rgb(48, 29, 120)",
      "button_background_hover": "rgb(55, 55, 56)",
      "icons_attention": "rgb(165, 219, 253)",
      "icons": "rgb(255, 50, 105)",
      "ntp_background": "rgb(19, 19, 19)",
      "popup_border": "rgb(19, 19, 19)",
      "sidebar_border": "rgb(31, 31, 32)",
      "sidebar": "rgb(31, 31, 32)",
      "tab_background_separator": "rgb(31, 31, 32)",
      "tab_loading": "rgb(165, 219, 253)",
      "tab_selected": "rgb(39, 33, 77)",
      "tab_text": "rgb(165, 219, 253)",
      "toolbar_bottom_separator": "rgb(31, 31, 32)",
      "toolbar_field_border_focus": "rgb(31, 31, 32)",
      "toolbar_field_border": "rgb(31, 31, 32)",
      "toolbar_field_focus": "rgb(19, 19, 19)",
      "toolbar_field_highlight_text": "rgb(160, 160, 223)",
      "toolbar_field_highlight": "rgb(31, 31, 32)",
      "toolbar_field_separator": "rgb(31, 31, 32)",
      "toolbar_top_separator": "rgb(31, 31, 32)",
      "toolbar_vertical_separator": "rgb(31, 31, 32)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{52bb243c-1b02-422f-8eea-46b6ceb2e34d}"
    }
  }
}