User Agent: Mozilla/5.0 (Windows NT 6.1; rv:14.0) Gecko/20100101 Firefox/14.0.1 Build ID: 20120713134347 Steps to reproduce: test.html contents: <?php Header("Location: mailto:email@example.com"); ?> maito: handler assigned to Thunderbird. I press <a href="test.html">mail</a> link placed on index.html Actual results: Mail client is launched normally with right address, but I got http://example.com/test.html in the FF address bar and blank page opened, so I forced to press browser's Back button. Effect is unstable, because if I press test.html link for the 2nd time, I got client launched staying at the current page (index.html) as supposed, 3rd time the bug is repeated and so on, i.e. I got normal reaction from FF only through time. Expected results: Best way is _always_ to stay on the current page, while launching mail client - as Chrome, Opera and Safari do. IE replaces address bar with mailto:firstname.lastname@example.org, opening blank page too, but even that is more clear result, than leaving http://example.com/test.html in the address bar as FF does.
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