User Agent: Mozilla/5.0 (Windows NT 5.1; rv:13.0a1) Gecko/13.0a1 Firefox/13.0a1 Build ID: 20120220031231 Steps to reproduce: STR: 1. Go to a site that uses HTML GET for example https://bugzilla.mozilla.org/show_bug.cgi?id=564051 2. Right click on the first attachment and select "Save Link As" 3. While the above download is in progress, repeat step 2 for the second attachment. Actual results: The filename is shown as "attachment.cgi" Expected results: The filename is shown as "attachment.cgi" instead of the actual filename. Work with other browsers

Confirmed on Firefox3.0-Nightly13a1 on VMware 1.5Mbps networks. http://hg.mozilla.org/mozilla-central/rev/3a7b9e61c263 Mozilla/5.0 (Windows NT 5.1; rv:13.0) Gecko/20120302 Firefox/13.0a1 ID:20120302031112 Cannot reproduce because not yet fixed Bug 299372: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9pre) Gecko/2008040204 Minefield/3.0pre Can reproduce: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9pre) Gecko/2008040305 Minefield/3.0pre Pushlog: http://bonsai.mozilla.org/cvsquery.cgi?treeid=default&module=all&branch=HEAD&branchtype=match&dir=&file=&filetype=match&who=&whotype=match&sortby=Date&hours=2&date=explicit&mindate=2008-04-02+04%3A00%3A00&maxdate=2008-04-03+05%3A00%3A00&cvsroot=%2Fcvsroot Suspected: Bug 299372

It works if set browser.download.saveLinkAsFilenameTimeout to large value such as 120000.