Examine source code of FormsPal PDF Editor: Fill, Sign & Edit

{
  "manifest_version": 3,
  "name": "FormsPal Document Toolbar - Edit, Fill, Sign",
  "version": "1.10.3",
  "description": "Edit, fill, sign, convert and create documents. Drop or right-click a PDF, an Office doc, or an image, or draft one with AI.",
  "permissions": [
    "storage",
    "unlimitedStorage",
    "contextMenus",
    "activeTab"
  ],
  "host_permissions": [
    "https://formspal.com/*",
    "https://*.formspal.com/*"
  ],
  "optional_host_permissions": [
    "https://*/*"
  ],
  "content_security_policy": {
    "extension_pages": "default-src 'none'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; connect-src 'self' https:; object-src 'none'; base-uri 'self'; frame-ancestors 'none'; form-action 'none'"
  },
  "background": {
    "scripts": [
      "storage.js",
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "FormsPal Document Toolbar",
    "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"
  },
  "content_scripts": [
    {
      "matches": [
        "https://formspal.com/pdf-editor/*",
        "https://formspal.com/pdf-converter/*"
      ],
      "js": [
        "storage.js",
        "content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://formspal.com/ai-document-maker/*",
        "https://ai.formspal.com/*"
      ],
      "js": [
        "storage.js",
        "ai-ingest.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://formspal.com/ai-document-maker/*",
        "https://ai.formspal.com/*"
      ],
      "js": [
        "ai-marker.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    },
    {
      "matches": [
        "https://pdf-chat.formspal.com/*",
        "https://formspal.com/chat-with-pdf/*"
      ],
      "js": [
        "storage.js",
        "handoff-client.js",
        "pdfchat-ingest.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://ocr.formspal.com/*",
        "https://formspal.com/ocr/*"
      ],
      "js": [
        "storage.js",
        "handoff-client.js",
        "ocr-ingest.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "formspal-pdf-editor@pdfq.com",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}