Examine source code of Animana PHP

{
  "manifest_version": 2,
  "name": "Animana PHP",
  "version": "0.0.6resigned1",
  "applications": {
    "gecko": {
      "id": "animana_php@downlandvets.co.uk",
      "strict_min_version": "51.0"
    }
  },
  "description": "Provides Pet Healthplan functionality for Animana.",
  "options_ui": {
    "page": "settings/options.html"
  },
  "permissions": [
    "webNavigation",
    "storage",
    "tabs",
    "activeTab",
    "contextMenus",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "php.js"
    ]
  }
}