Examine source code of grape theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "grapetheme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(85, 39, 120)",
      "toolbar_text": "rgb(155, 157, 191)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(78, 76, 113)",
      "toolbar_field": "rgb(150, 148, 210)",
      "toolbar_field_text": "rgb(43, 43, 45)",
      "tab_line": "rgb(211, 198, 198)",
      "popup": "rgb(63, 104, 59)",
      "popup_text": "rgb(158, 168, 119)",
      "tab_loading": "rgb(211, 198, 198)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{30b47f6f-9d36-403c-810f-f0b1fd44710d}"
    }
  }
}