Examine source code of personal dark switch

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "dark switch",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(31, 34, 61)",
      "toolbar_text": "rgb(158, 164, 190)",
      "frame": "rgb(8, 11, 33)",
      "tab_background_text": "rgb(158, 164, 190)",
      "toolbar_field": "rgb(54, 58, 89)",
      "toolbar_field_text": "rgb(215, 226, 239)",
      "tab_line": "rgba(40, 69, 218, 0.3)",
      "popup": "rgb(31, 34, 61)",
      "popup_text": "rgb(215, 226, 239)",
      "ntp_background": "rgb(74, 79, 107)",
      "tab_loading": "rgba(40, 69, 218, 0.3)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b89e0385-916e-46aa-a17a-7c7386a7c5d2}"
    }
  }
}