http://googlebar.mozdev.org/feedback.html#c508 installation is not possible for Firefox 1.0+ either v0.9.30 or development versions give same error: "Firefox could not install this item because "install.rdf" is malformed." Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b2) Gecko/20050228 Firefox/1.0+