Examine source code of pinonconstant

{
  "theme": {
    "images": {
      "theme_frame": "Pi.jpg"
    },
    "colors": {
      "frame": "#346ef5",
      "tab_background_text": "#346ef5"
    }
  },
  "version": "2.0",
  "name": "pinonconstant",
  "manifest_version": 2,
  "description": "Just pi"
}