Examine source code of Privately Search Selected

{
  "name": "Privately Search Selected",
  "description": "Adds menu item to privately search selected text.",
  "version": "0.2resigned1",
  "author": "Marco Lucidi",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "privately-search-selected@example.com",
      "strict_min_version": "60.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "menus"
  ],
  "icons": {
    "32": "icons/private-32.png"
  }
}