Examine source code of Bubble Chamber

{
  "theme": {
    "images": {
      "theme_frame": "bubblechamberhead.jpg"
    },
    "colors": {
      "frame": "#5469f0",
      "tab_background_text": "#fcfcfc"
    }
  },
  "version": "2.0",
  "name": "Bubble Chamber",
  "manifest_version": 2,
  "description": "spiral traces of quantum particle cascades in a bubble chamber"
}