Examine source code of FireFox slash

{
  "theme": {
    "images": {
      "theme_frame": "Untitled-2.jpg"
    },
    "colors": {
      "frame": "#537fa6",
      "tab_background_text": "#f59208"
    }
  },
  "version": "2.0",
  "name": "FireFox slash",
  "manifest_version": 2,
  "description": "hope u like it"
}