Examine source code of Cite Engine Pro

{
  "manifest_version": 2,
  "name": "Citation Generator",
  "version": "2.0",
  "description": "Generates citations from websites in multiple formats.",
  "permissions": [
    "activeTab",
    "tabs",
    "clipboardWrite",
    "scripting",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_security_policy": "default-src 'self'; img-src 'self' https://www.patreon.com;",
  "browser_specific_settings": {
    "gecko": {
      "id": "{e901771b-b133-43c3-83f3-2854ea0a1c9d}"
    }
  }
}