Firefox aborts its http request silently within 60 seconds

duplicate of [/questions/1047223]
*Summary
Firefox aborts its http request within almost 60 seconds(period till
timeout varies) and tells nothing to users. This happened with both of
Nginx and Apache.
*Environment
Client browser: Firefox 35.0.1
Client OS: Windows 7 Enterprise 32bit SP1
Web Server: Apache 2.2.3-91 & Nginx 1.6.2-1
Server OS: CentOS 5.11
PHP: 5.3.3
FastCGI: spawn-fcgi-1.6.3-1
*Description of the issue
I have noticed that nginx logs http response code 499 so often.
We use nginx almost only for two web applications, the one based on PHP
and others on ruby. We experiences this problem in both apps. The server and client PC belong to the same subnet.
Since last month, nginx logged 624 errors for Firefox and 16 for other
browsers(almost IE).
So for test, I wrote the simple PHP (see the bottom of this article) and tried to access it
through both of Apache & Nginx with Firefox 35.0.1 and IE 11. IE11
waited 120 seconds and returned html successfully through both of nginx
and Apache, but Firefox failed either.
Let me describe Firefox's behaviour.
1. Enter the test php url at location bar and press enter.
2. The message 'waiting server response' appears at status bar for a while.
3. Watching network conversation through Wireshark, 'Keep Alive' signals
are repeated some times between server and client, and after that,
4. The message dissappears. 'FIN' signal is sent to the server from the client just after that. Firebug logs 'Aborted' at the almost the same time.
5. The server responses 'FIN ACK.'
There is a bit difference with nginx and Apache in behaviour after 'FIN
ACK'.
A.Nginx
Nginx logs '499' error and finish conversation immediately.
B.Apache doesn't log anthying at this step. After 120 seconds(sleep timer
in PHP) from request it returns expected html. Of course Firefox don't render it but I could confirm both of request and response from Wireshark's 'Follow TCP Stream' function. Finally it is logged with http status code 200 at httpd log file.
I repeated this test several times. Actual timeout period varies from 22
to 70 seconds but results are same.
With my understanding, the browser is expected to show 'time out error'
after such situation but it doesn't show anything. So end user can't
know what happend.
*What I tried to solve the problem
*disabled all extentions other than firebug.
*set 'network.tcp.keepalive.enabled' to false at about:config.
*set 'network.http.spdy.enabled' to false, too.
*set 'network.http.response.timeout' to 0.
*disabled IPV6 and DNS prefetch seeing the following help.
https://support.mozilla.org/en-US/kb/websites-dont-load-troubleshoot-and-fix-errors
*changed Timeout to 0 at apche's http.conf.
My purpose is make our web apps to work properly in our working environment. I've recommended Firefox to our collegues because it was very cool application. Changing the default brawser is nightmare to me. Any suggestions are welcome.
<test php>
<?php sleep(120); ?>
<?php echo time(); ?>

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