Examine source code of Mutiny

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Mutiny",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(19, 19, 19)",
      "toolbar_text": "rgb(222, 177, 79)",
      "frame": "rgb(23, 23, 23)",
      "tab_background_text": "rgb(128, 123, 100)",
      "toolbar_field": "rgb(30, 27, 28)",
      "toolbar_field_text": "rgb(233, 173, 142)",
      "tab_line": "rgba(222, 177, 79, 0)",
      "popup": "rgb(23, 23, 23)",
      "popup_text": "rgb(137, 158, 59)",
      "button_background_active": "rgb(61, 58, 59)",
      "button_background_hover": "rgb(61, 58, 59)",
      "frame_inactive": "rgb(30, 27, 28)",
      "icons_attention": "rgb(187, 103, 103)",
      "icons": "rgb(149, 108, 116)",
      "popup_border": "rgb(187, 103, 103)",
      "popup_highlight_text": "rgb(222, 177, 79)",
      "popup_highlight": "rgb(61, 58, 59)",
      "sidebar_border": "rgb(222, 177, 79)",
      "sidebar_highlight_text": "rgb(222, 177, 79)",
      "sidebar_highlight": "rgb(222, 177, 79)",
      "sidebar_text": "rgb(222, 177, 79)",
      "sidebar": "rgb(23, 23, 23)",
      "tab_background_separator": "rgb(34, 255, 0)",
      "tab_loading": "rgb(210, 208, 116)",
      "tab_selected": "rgb(19, 19, 19)",
      "tab_text": "rgb(222, 177, 79)",
      "toolbar_bottom_separator": "rgb(136, 60, 67)",
      "toolbar_field_border_focus": "rgb(187, 103, 103)",
      "toolbar_field_border": "rgb(23, 23, 23)",
      "toolbar_field_focus": "rgb(19, 19, 19)",
      "toolbar_field_highlight_text": "rgb(210, 208, 116)",
      "toolbar_field_highlight": "rgb(23, 23, 23)",
      "toolbar_field_text_focus": "rgb(137, 158, 59)",
      "toolbar_top_separator": "rgb(222, 177, 79)",
      "toolbar_vertical_separator": "rgb(58, 22, 247)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0c23af2a-3275-4310-abde-dffac3ff3a2c}"
    }
  }
}