Examine source code of Bookmark All Button

{
  "manifest_version": 2,
  "name": "Bookmark All",
  "description": "Bookmark all open page",
  "version": "2.1resigned1",
  "browser_action": {
    "default_icon": "128.png",
    "default_title": "Bookmark All"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "bookmarks"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "128": "128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{946147c0-8614-4295-88aa-9af0bdf667d4}"
    }
  }
}