Examine source code of BFBC2 Silent

{
  "theme": {
    "images": {
      "theme_frame": "firefoxbfbc2header.jpg"
    },
    "colors": {
      "frame": "#3d3d3d",
      "tab_background_text": "#e3e3e3"
    }
  },
  "version": "2.0",
  "name": "BFBC2 Silent",
  "manifest_version": 2,
  "description": "BFBC2 Silent by mysli"
}