Examine source code of Chrome Just Black

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Chrome Just Black",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(45, 45, 45)",
      "toolbar_text": "rgb(231, 231, 231)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(203, 203, 203)",
      "toolbar_field": "rgb(241, 243, 244)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(45, 45, 45)",
      "popup": "rgb(45, 45, 45)",
      "popup_text": "rgb(231, 231, 231)",
      "tab_text": "rgb(167, 168, 168)",
      "tab_loading": "rgb(45, 45, 45)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{504d6f52-ec91-4e25-a975-0136cf224bd2}"
    }
  }
}