Examine source code of Animana Extensions

{
  "manifest_version": 2,
  "name": "Animana Extensions",
  "version": "0.1.5resigned1",
  "applications": {
    "gecko": {
      "id": "animana@downlandvets.co.uk",
      "strict_min_version": "51.0"
    }
  },
  "description": "Dosage extension: allow autocompletion of dosage labels in Animana and product filtering, updated to use Webextensions.  PDF redirection: allows redirection of PDF for example to allow automatic label/receipt printing, microchip registrations, or forwarding forms to a tablet for electronic signing.  Debt list category enhancements.",
  "permissions": [
    "nativeMessaging",
    "webNavigation",
    "storage",
    "tabs",
    "cookies",
    "webRequest",
    "webRequestBlocking",
    "*://*.animana.com/"
  ],
  "web_accessible_resources": [
    "debtors/wo_sound.wav"
  ],
  "background": {
    "scripts": [
      "pdf/listener.js",
      "tablets/alter.js",
      "debtors/start.js",
      "patientfile/alter.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "pdf/close_tab.js"
      ],
      "run_at": "document_end"
    }
  ]
}