Examine source code of Duckbones theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Duckbones theme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(14, 16, 26)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(14, 16, 26)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(15, 17, 27)",
      "toolbar_field_text": "rgb(98, 102, 183)",
      "tab_line": "rgb(98, 102, 183)",
      "popup": "rgb(14, 16, 26)",
      "popup_text": "rgb(98, 102, 183)",
      "ntp_background": "rgb(14, 16, 26)",
      "tab_loading": "rgb(98, 102, 183)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{960c31e5-b783-4992-9484-0681af1b4d58}"
    }
  }
}