Examine source code of Sylt mirrored

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_TEMPLATE_2.jpg"
    },
    "colors": {
      "frame": "#b0a7a7",
      "tab_background_text": "#f5f2f2"
    }
  },
  "version": "2.0",
  "name": "Sylt mirrored",
  "manifest_version": 2,
  "description": "South of Sylt, but in the wrong way, so you have the best part of it on the right site of firefox."
}