Examine source code of Levellers 2

{
  "theme": {
    "images": {
      "theme_frame": "Banner2.JPG"
    },
    "colors": {
      "frame": "#121010",
      "tab_background_text": "#ff6905"
    }
  },
  "version": "2.0",
  "name": "Levellers 2",
  "manifest_version": 2,
  "description": "Levellers artwork for Levellers fans"
}