Examine source code of Simple Dark Fox

{
  "theme": {
    "images": {
      "theme_frame": "personasimple.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ff8800"
    }
  },
  "version": "2.0",
  "name": "Simple Dark Fox",
  "manifest_version": 2,
  "description": "Simple dark with Firefox logo."
}