Examine source code of The Stig

{
  "theme": {
    "images": {
      "theme_frame": "stigheader1.png"
    },
    "colors": {
      "frame": "#a30505",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "The Stig",
  "manifest_version": 2,
  "description": "Some say he has his own Firefox Persona...\n\nTop Gear The Stig"
}