Examine source code of Why you serious

{
  "theme": {
    "images": {
      "theme_frame": "Firefox-Design_by_Dyfcom.png"
    },
    "colors": {
      "frame": "#ebebeb",
      "tab_background_text": "#c9c9c9"
    }
  },
  "version": "2.0",
  "name": "Why you serious",
  "manifest_version": 2,
  "description": "Why you serious?"
}