Examine source code of Silvercloud 1

{
  "theme": {
    "images": {
      "theme_frame": "mozila-gaga.jpg"
    },
    "colors": {
      "frame": "#858585",
      "tab_background_text": "#ff303e"
    }
  },
  "version": "2.0",
  "name": "Silvercloud 1",
  "manifest_version": 2,
  "description": "My Gaga Persona. I love Gaga"
}