Dr.Web Link Checker
for Firefox (3.6 - 6.0) and Mozilla (1.7 - 1.8)
Install (FREE Download)
Prior to installation check to be sure that the installation of extensions has been enabled in your browser’s settings. Open Tools > Web features, and make sure that the “Allow web sites to install software” option has been checked.
In the Tools menu, select Extensions. A window will appear, displaying a list of installed add-ons. Select Dr.Web Linkchecker and click “Uninstall.”