Examine source code of Set Bookmark Target

{
  "author": "igorlogius",
  "homepage_url": "https://github.com/igorlogius/bookmark-options",
  "description": "Set some extra bookmark options",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "128": "icon.png"
  },
  "manifest_version": 2,
  "name": "Set Bookmark Target",
  "permissions": [
    "tabs",
    "bookmarks",
    "menus",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "version": "1.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{ecad3282-3fab-46cf-b709-7f10ea068fa1}"
    }
  }
}