Examine source code of Fire Pit

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_firepit.jpg"
    },
    "colors": {
      "frame": "#3d75b0",
      "tab_background_text": "#faf38c"
    }
  },
  "version": "2.0",
  "name": "Fire Pit",
  "manifest_version": 2
}