Examine source code of Base2Tone Evening

{
  "name": "Base2Tone Evening",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Proyecto nuevo(1).png"
    },
    "colors": {
      "frame": "rgba(42, 39, 52, 1)",
      "tab_background_text": "rgba(238, 235, 255, 1)",
      "toolbar": "rgba(84, 81, 103, 1)",
      "tab_line": "rgba(255, 161, 66, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b09b59b4-f337-4ebf-b40f-008343f1ca27}"
    }
  }
}