2 Factor Sigil is a free Chrome add-on developed by Will. It falls under the category of Browsers and is specifically listed as an Add-ons & Tools subcategory.

This program provides a visual indicator in the menu bar to show whether the current website supports 2nd factor authentication. When a site supports 2nd factor authentication, the icon turns green. By clicking on the icon, users can access documentation on how to enable 2 factor authentication, if available.

With its simple yet valuable functionality, 2 Factor Sigil is a useful tool for individuals who prioritize security and want to easily identify websites that support 2nd factor authentication.