Examine source code of Plume et Be different

{
  "theme": {
    "images": {
      "theme_frame": "be.png"
    },
    "colors": {
      "frame": "#a6a4a4",
      "tab_background_text": "#736464"
    }
  },
  "version": "2.0",
  "name": "Plume et Be different",
  "manifest_version": 2,
  "description": "(:"
}