Examine source code of Glass Supernova

{
  "theme": {
    "images": {
      "theme_frame": "Supernova-firefoxheader.jpg"
    },
    "colors": {
      "frame": "#969696",
      "tab_background_text": "#8a7dff"
    }
  },
  "version": "2.0",
  "name": "Glass Supernova",
  "manifest_version": 2,
  "description": "A supernova blasting through a glass shell; exploding on your browser."
}