Fontmark is a free Chrome add-on developed by Nissan Ahmed. It falls under the category of Browsers and is listed as an Add-ons & Tools subcategory. With Fontmark, users can easily manage and preview their favorite Google Fonts using bookmarks.

The main feature of Fontmark is the ability to create collections of fonts that can be previewed on a single page on the Google Fonts website. Users can add as many fonts as they like to each collection, and these collections are initially saved in a folder named "Fonts". However, users have the flexibility to move the folder to any desired location.

In addition, Fontmark offers the functionality to import all the fonts from one collection to another or remove them from an existing collection. This can be done by opening the extension menu on the collection preview page on the Google Fonts website.

It is worth noting that Fontmark does not collect any user data, and the code for the extension is open source and available on GitHub.