Examine source code of Firefox is everywhere

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_LABS.png"
    },
    "colors": {
      "frame": "#919191",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Firefox is everywhere",
  "manifest_version": 2,
  "description": "El clásico símbolo de Firefox ahora con un renovado planeta, el verdadero mundo."
}