The extension monitors the web pages you are viewing. When a page matches a site list for a configured server, or if the extension is configured to use the PDF viewer for all sites, the extension then monitors pages specifically for PDF files. Whenever a PDF file is about to be viewed, the extension intercepts it and provides it to the PDF.js viewer instead of the native viewer.
If an UnForm server is integrated, and the server has a [webprinters] section configured to define printers that can accept PDF files, you can click the UF button on the PDF toolbar to open a panel for PDF submission. Check a printer and click the Submit button to submit the PDF file to that printer definition.
If a CirrusPrint server is integrated, you can click the CP button to open a panel for PDF submission. Check any of the device definitions (printers, users, etc.) and click the Submit button to send the PDF file to that destination.
Exceptions
Pages produced by a form post are not intercepted because to retrieve them would require a second post, which can cause problems in some situations.
Requests to PDF files that are erased from the server as they are viewed will not be shown, because the file is no longer available to download.
Browser security prevents intermixing http:// and https:// web sites. For example, if your ERP application uses https, an UnForm or CirrusPrint server configured to integrate with that site must also be accessed using https.