Examine source code of Doggify

{
  "manifest_version": 2,
  "name": "Doggify",
  "version": "1.1.1",
  "version_name": "1.1.1 Added timer for replacement of dynamically loaded images",
  "description": "An extension that lets you doggify your browsing experience.",
  "developer": {
    "name": "Sudoblark",
    "url": "https://sudoblark.github.io/Doggify-Firefox/"
  },
  "incognito": "not_allowed",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "beautiful-doggos.js"
      ]
    }
  ],
  "icons": {
    "48": "icons/32-paw.png"
  },
  "permissions": [
    "https://dog.ceo/api/*",
    "storage",
    "menus",
    "activeTab"
  ],
  "options_ui": {
    "page": "settings/settings.html"
  },
  "applications": {
    "gecko": {
      "id": "{78af7959-df30-4a4a-bb94-399d7e32abae}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}