IdentFavIcon is based on the idea of Don Park called identicon to generate visually pleasing and easily recognizable icons from identifiers, such as IP addresses. This extension replaces the default favicon for web pages without one with a visually pleasing identicon, which is unique for each domain. The extension uses the CRC-32 code of the web page’s domain name to seed the identicon renderer.

IdentFavIcon requires zero configuration, there are no options to mess with. Just visit a site without a favicon, and as soon as the download finishes, you should see your shiny new identfavicon in the tab header and among your bookmarks.