Examine source code of Send to Dejavu Reader

{
  "manifest_version": 3,
  "name": "Dejavu English Text Reader",
  "version": "1.4.0",
  "description": "Analyze and save the current page to your Dejavu Reader archive.",
  "browser_specific_settings": {
    "gecko": {
      "id": "send-to-dejavu@dejavuenglish.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "personallyIdentifyingInfo",
          "browsingActivity",
          "websiteContent"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "https://api.dejavuenglish.com/*"
  ],
  "content_security_policy": {
    "extension_pages": "default-src 'none'; script-src 'self'; style-src 'self'; img-src 'self' data:; connect-src https://api.dejavuenglish.com; font-src 'none'; media-src data: blob:; object-src 'none'; frame-src 'none'"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "reader.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}