Examine source code of NTB official header

{
  "name": "NTB official header",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "2Untitled.png"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(145, 141, 55, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{01bce6df-0854-4c10-9bfa-a2f78d980b10}"
    }
  }
}