User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.9) Gecko/20071025 Firefox/2.0.0.9 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.9) Gecko/20071025 Firefox/2.0.0.9 When you click on an Unicode URL like http://www.müller.de/ in an external application like Thunderbird, Firefox does not encode it correctly to puny code, but urlencode which prevents a connection. e.g. Firefox can't find the server at www.m%c3%bcller.de. Reproducible: Always Steps to Reproduce: 1.Enter existing and valid URL with Unicode Chars into Thunderbird 2.Click on URL to open 3.see error Page in Firefox Actual Results: Firefox tries to open the URL urlencoded (http://www.m%c3%bcller.de/) Expected Results: Firefox should open the URL as punycode (xn--mller-kva.de) Also tested with Vista and Firefox 3 Beta 5

This is a Dup of bug 309671. Reporter/Someone with rights: Please dup this bug