Examine source code of Interface

{
  "theme": {
    "images": {
      "theme_frame": "test1.png"
    },
    "colors": {
      "frame": "#cfcfcf",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Interface",
  "manifest_version": 2,
  "description": "Comes from a desktop wallpaper image I created.  Just toned down the colors to fit in with how I liked Firefox to look."
}