Examine source code of Dark Swirl

{
  "theme": {
    "images": {
      "theme_frame": "darkswirlpersona.jpg"
    },
    "colors": {
      "frame": "#c400ff",
      "tab_background_text": "#cc66ff"
    }
  },
  "version": "2.0",
  "name": "Dark Swirl",
  "manifest_version": 2,
  "description": "This is my 1st Persona design for firefox. I just wanna give it a try and see what it'll look like on my browser. Blends of dark violent colors. Hope you guys like it!"
}