Examine source code of Be Silent

{
  "theme": {
    "images": {
      "theme_frame": "header2.jpg"
    },
    "colors": {
      "frame": "#966666",
      "tab_background_text": "#919191"
    }
  },
  "version": "2.0",
  "name": "Be Silent",
  "manifest_version": 2,
  "description": "Artwork: Silence\nCopyright goes to Onikazehaya"
}