Examine source code of FireFox 3D Black

{
  "theme": {
    "images": {
      "theme_frame": "Firefoxtheme.jpg"
    },
    "colors": {
      "frame": "#fcf9f9",
      "tab_background_text": "#faf5f5"
    }
  },
  "version": "2.0",
  "name": "FireFox 3D Black",
  "manifest_version": 2,
  "description": "The actual 3D FireFox Icon in the header was NOT made by me.  Credit goes to \"CoyoteCreations\".  the images is part of an Alienware Icon Pack download."
}