F1 by Mozilla LabsInstall F1 available for Firefox 3.6+ Get Firefox to use this Add-On. So, what’s F1? F1 is a browser extension that allows you to share links in a fast and fun way. Share links from within the browser, from any webpage, using the same services you already know and love. F1 is made by Mozilla Messaging.
Twitter's iframe ad remover (in the latest design)
