Examine source code of Photon-theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Photon-Autotheme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(249, 249, 250)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(32, 35, 64)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgba(255, 255, 255, 0)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "toolbar_bottom_separator": "rgb(225, 225, 226)",
      "toolbar_field_border": "rgb(166, 166, 167)",
      "tab_loading": "rgba(255, 255, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f74b9dbc-2919-4c1f-a278-f645774f0d42}"
    }
  }
}