Examine source code of Vendetta

{
  "theme": {
    "images": {
      "theme_frame": "V.jpg"
    },
    "colors": {
      "frame": "#a10505",
      "tab_background_text": "#870c0c"
    }
  },
  "version": "2.0",
  "name": "Vendetta",
  "manifest_version": 2,
  "description": "Remember rembember\nthe fifth of November..."
}