Examine source code of Firefox Grey Wall

{
  "theme": {
    "images": {
      "theme_frame": "firefoxpers.jpg"
    },
    "colors": {
      "frame": "#858585",
      "tab_background_text": "#cfcfcf"
    }
  },
  "version": "2.0",
  "name": "Firefox Grey Wall",
  "manifest_version": 2,
  "description": "made by Tim And Luka.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n...lass uns hüpfen wie freunde"
}