Examine source code of WildCritters Final

{
  "theme": {
    "images": {
      "theme_frame": "wcbg2.png"
    },
    "colors": {
      "frame": "#fff6d7",
      "tab_background_text": "#3366cc"
    }
  },
  "version": "2.0",
  "name": "WildCritters Final",
  "manifest_version": 2,
  "description": "Intended for FF4 Beta 1 (and 2) in maximized mode\n\nUPDATED 7/18: Header should look better now."
}