User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.9.1b3) Gecko/20090305 Firefox/3.1b3 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.9.1b3) Gecko/20090305 Firefox/3.1b3 Firefox create some pairs of localhost connections. (as described by Wan-Teh Chang 2002-03-25) https://bugzilla.mozilla.org/show_bug.cgi?id=100154#c18 But port numbers take randomly, and it create problems for other software, also running on localhost. If that software start after firefox and want to take, for example, localhost:1042, it cannot because firefox already taken it. Please, add to preferences a port range in which firefox can take the localhost ports. Then every user can configure that ports in own configuration. Reproducible: Always Steps to Reproduce: 1.start firefox 2.netstat -ano 3.see localhost:NNNN Established Actual Results: TCP 127.0.0.1:1677 127.0.0.1:1678 ESTABLISHED 3232 TCP 127.0.0.1:1678 127.0.0.1:1677 ESTABLISHED 3232 Expected Results: want to configure NNNN range.
FF 4.0b4 using 62417 - 62418 ports... it's more reasonable.