Examine source code of Bookmark 301 Updater

{
  "manifest_version": 2,
  "version": "1.6resigned1",
  "author": "Dan Wallis",
  "name": "Bookmark 301 Updater",
  "description": "Automatically update bookmarks for permanently moved resources, while browsing",
  "icons": {
    "16": "icons/bookmark-16.png",
    "24": "icons/bookmark-24.png",
    "32": "icons/bookmark-32.png",
    "48": "icons/bookmark-48.png",
    "96": "icons/bookmark-96.png",
    "128": "icons/bookmark-128.png",
    "256": "icons/bookmark-256.png"
  },
  "permissions": [
    "bookmarks",
    "webRequest",
    "*://*/"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dc9976ff-0dfb-40fa-ac63-3186f9bd0082}"
    }
  }
}