Examine source code of Fenton

{
  "theme": {
    "images": {
      "theme_frame": "firefoxpersonas.JPG"
    },
    "colors": {
      "frame": "#0d0d0d",
      "tab_background_text": "#ed6b0e"
    }
  },
  "version": "2.0",
  "name": "Fenton",
  "manifest_version": 2
}