Call form browser is a free Chrome extension developed by Jis van Overschot. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This extension allows users to make calls directly from their browser.

To use this extension, users need to first set their preferred call protocol by clicking on the extension icon and going to options. The default call protocol is set to "tel", but users can choose their preferred protocol.

There are two ways to use this extension. The first method is to highlight a phone number and right-click on it. From the context menu, select "Call: {phone number}" to initiate the call. The second method is to find a tel link and right-click on it. The context menu will display the option "Call from link".