The author has not yet updated NoDoFollow, and I do not see any note here about when it might be updated: https://addons.mozilla.org/en-US/firefox/addon/nodofollow/ If you trust '''unofficial''' versions, you can get an updated version from this blog. I don't think anyone has verified it, but you can read comments to see whether you trust it: '''unofficial''': http://www.jayceooi.com/2011/03/22/download-nodofollow-1-3-add-on-for-firefox-4/ I also saw a recommendation on a different site to use a Greasemonkey userscript instead. If you have the Greasemonkey add-on, you can install the script here: http://userscripts.org/scripts/show/26418 I haven't tried it myself.