Examine source code of Chromium Black

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Chromium Black",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(53, 53, 53)",
      "toolbar_text": "rgb(228, 230, 233)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(228, 230, 233)",
      "toolbar_field": "rgb(39, 39, 41)",
      "toolbar_field_text": "rgb(228, 230, 233)",
      "tab_line": "rgb(53, 53, 53)",
      "popup": "rgb(53, 53, 53)",
      "popup_text": "rgb(228, 230, 233)",
      "tab_loading": "rgb(53, 53, 53)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2c94238b-b054-462d-9104-8a9e26b1448a}"
    }
  }
}