Examine source code of Bookmark Updater

{
  "manifest_version": 2,
  "name": "Bookmark Updater",
  "version": "1.0",
  "default_locale": "en",
  "description": "Add the option to update the bookmark link to the address of the currently viewed webpage.",
  "background": {
    "scripts": [
      "bookmarkupdater.js"
    ]
  },
  "permissions": [
    "tabs",
    "menus",
    "bookmarks",
    "contextMenus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{21b8ad22-fd6e-499f-b9b5-c816beb3b09a}"
    }
  }
}