Examine source code of Offline PDF Studio

{
  "manifest_version": 3,
  "name": "Offline PDF Studio",
  "short_name": "PDF Studio",
  "version": "0.4",
  "description": "Read, edit, fill, annotate and convert PDF files fully offline.",
  "browser_specific_settings": {
    "gecko": {
      "id": "offline-pdf-studio@local.addon",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "Offline PDF Studio",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "contextMenus"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "viewer.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}