The "Open iframe in new tab or window" is a Chrome extension developed by Graeme Gellatly. It falls under the category of Browsers and is specifically categorized as an Add-ons & Tools. This free extension adds a convenient context menu to iframes, allowing users to open them in either a new tab or a popup window.

The main purpose of this extension is to provide a quick and easy way to open iframes. It is especially useful when dealing with iframes that contain PDF files, as the popup window created by the extension is designed specifically for PDFs. The window pops up slightly offset to the right and is narrower than a standard window, providing a better viewing experience for PDF files.

With the "Open iframe in new tab or window" extension, users can enhance their browsing experience by easily opening iframes in a separate tab or window, improving accessibility and convenience.