Examine source code of Redline Fox

{
  "theme": {
    "images": {
      "theme_frame": "redline.png"
    },
    "colors": {
      "frame": "#969696",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Redline Fox",
  "manifest_version": 2,
  "description": "Dark gray and black checkered background with solid red framing.  Firefox logo placed in upper left corner where it is always visible."
}