Vimium is a browser extension that enables mouseless use of a web browser. Using a set of keyboard bindings similar to the venerable vi editor, users can navigate pages, control tabs, manipulate history and bookmarks, and follow links. For example, to follow a link on a page a user can press "f." Vimium will then label every clickable element on the page with a 1-2 letter hint, which can be entered to perform a click on a corresponding element. A list of keybindings is provided on the Vimium homepage, along with a brief video tutorial demonstrating the extension's features. Vimium is free software, distributed under the MIT license, with source code available on Github. Vimium for Chrome can be found in the Chrome Extensions Gallery. Vimium for Firefox can be found on addons.mozilla.org as Vimium-FF.