Examine source code of ROCK N TECH

{
  "theme": {
    "images": {
      "theme_frame": "rockntech.png"
    },
    "colors": {
      "frame": "#2102ab",
      "tab_background_text": "#ebf5ed"
    }
  },
  "version": "2.0",
  "name": "ROCK N TECH",
  "manifest_version": 2,
  "description": "Coloque o madruguinha no seu Firefox!"
}