Examine source code of Tchokun

{
  "theme": {
    "images": {
      "theme_frame": "tchokun.jpg"
    },
    "colors": {
      "frame": "#0e6b32",
      "tab_background_text": "#2aa878"
    }
  },
  "version": "2.0",
  "name": "Tchokun",
  "manifest_version": 2,
  "description": "Works by tchokun for mozilla ^^"
}