Examine source code of Celebi

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#76f781",
      "tab_background_text": "#152611"
    }
  },
  "version": "2.0",
  "name": "Celebi",
  "manifest_version": 2,
  "description": "A cute celebi eating fruit, now as your Firefox theme!"
}