Block File Types is a Chrome add-on developed by Clay. It falls under the category of Browsers and is specifically classified as an Add-ons & Tools application. This program allows users to block local file types from opening in the browser.

With Block File Types, administrators can configure the blocked file types using JSON. The JSON configuration includes a "blocktypes" key with a corresponding array value. Users can specify the file types they want to block by adding them to the array. For example, if the administrator wants to block HTML and JavaScript files, they can set the value of "blocktypes" to ["html", "js"].

This add-on provides a simple and effective way to prevent certain file types from being opened in the browser, adding an extra layer of security and control. It is a free tool, making it accessible to a wide range of users.