Examine source code of Groove time

{
  "theme": {
    "images": {
      "theme_frame": "FireFoxGrooveheader.jpg"
    },
    "colors": {
      "frame": "#fad900",
      "tab_background_text": "#e6ff00"
    }
  },
  "version": "2.0",
  "name": "Groove time",
  "manifest_version": 2,
  "description": "Just a cool thing I made in gimp."
}