Examine source code of The night saver

{
  "manifest_version": 2,
  "version": "1.3",
  "name": "The night saver",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(35, 35, 35)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(24, 24, 24)",
      "tab_background_text": "rgb(192, 192, 192)",
      "toolbar_field": "rgb(32, 32, 32)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(0, 0, 0, 0)",
      "popup": "rgb(24, 24, 24)",
      "popup_text": "rgb(255, 255, 255)",
      "frame_inactive": "rgb(0, 0, 0)",
      "icons_attention": "rgb(0, 175, 140)",
      "icons": "rgb(255, 255, 255)",
      "popup_border": "rgb(24, 24, 24)",
      "sidebar_border": "rgb(24, 24, 24)",
      "sidebar": "rgb(35, 35, 35)",
      "tab_loading": "rgb(0, 110, 170)",
      "toolbar_bottom_separator": "rgb(35, 35, 35)",
      "toolbar_field_border_focus": "rgb(120, 160, 200)",
      "toolbar_field_border": "rgb(24, 24, 24)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6ea53a1a-2edc-4073-871a-62404084508d}"
    }
  }
}