Examine source code of Firestorm

{
  "theme": {
    "images": {
      "theme_frame": "firestorm_header.jpg"
    },
    "colors": {
      "frame": "#403939",
      "tab_background_text": "#f7ad00"
    }
  },
  "version": "2.0",
  "name": "Firestorm",
  "manifest_version": 2,
  "description": "A swirling flame pattern on black background to add color and style while still being readable."
}