Examine source code of Koha-Simple

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_koha.jpg"
    },
    "colors": {
      "frame": "#83c72a",
      "tab_background_text": "#080202"
    }
  },
  "version": "2.0",
  "name": "Koha-Simple",
  "manifest_version": 2,
  "description": "Help to differentiate Koha firefox"
}