Examine source code of Poison Ivy

{
  "theme": {
    "images": {
      "theme_frame": "poisoonivyfirefoxtheme.jpg"
    },
    "colors": {
      "frame": "#4f4d4d",
      "tab_background_text": "#f3f703"
    }
  },
  "version": "2.0",
  "name": "Poison Ivy",
  "manifest_version": 2,
  "description": "Poison Ivy from unknown artist and Arkham Asylum video game."
}