Examine source code of Denitobookmark

{
  "manifest_version": 2,
  "name": "Borderify",
  "version": "1.0",
  "description": "Adds a red border to all webpages matching mozilla.org.",
  "icons": {
    "48": "icons/border-48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "bookmarks"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7aee4566-58c0-42c6-8e83-ef9f194e4257}"
    }
  }
}