Examine source code of Bookmark Changer

{
  "manifest_version": 2,
  "name": "Bookmark Changer",
  "description": "Lets the user set a bookmark to the current tab quickly and conveniently",
  "version": "1.1resigned1",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "menus",
    "tabs",
    "activeTab",
    "bookmarks"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b0a2787f-5503-40c5-8e03-71abfc331172}"
    }
  }
}