Slow request for css- and js-files in Firefox

Hi everybody,
actually we observer a strange behavior on a workstation (WinXP Pro SP3) while using Firefox (Version With Firebug (Version 1.9.1) we can see that requests for js- and css-files have to wait 20 seconds until they are further processed.
There is an application in a local Jboss-instance (localhost: 8080) which is used. In order to troubleshoot the problem we already reinstalled the Firefox, reset the user settings, set the value "network.dns.disableIPv6" in about:config to "true". The last change has resolved the problem for about 2 hours until it appeared again.

Does anyone have an idea what could cause the problem?
Is there a timeout of 20seconds im Firefox which could cause the problem?

Thanks a lot and with best regards
Who is Participating?
stergiumConnect With a Mentor Commented:
ok. try disabling the firebug addon for testing purposes.
it should load faster.  I have a question. Does this happen to only one workstation or all of them ? In case of happening only on one of them , is there something different on software/hardware configuration from the other workstations?
stergiumConnect With a Mentor Commented:
Your test are always done with the firebug addon? It is known to slow these processes as it analyses the code. Is your cache enabled?
Another browser like google chrome/chromium does it behaves the same?
please feedback.
SystemadministrationAuthor Commented:
Hi stergium,
yes we always use the combination firefox/firebug in company as standard, so the other browser-types are not tested as they can't be rolled out here.

The cache is activated but the following parameter is changed from standard:
In about:config "browser.cache.check_doc_frequency" is now set to "0".

0 = Check for a new version of a page once per session (a session starts when the first application window opens and ends when the last application window closes).
SystemadministrationAuthor Commented:
we disabled the Add-on but the problem is still there.

Also the disabling of cache did not fix it.

The problem only appears on this one workstation. The main-difference is the os. It is the last workstation running windows-xp. All other workstations are already using windows 7.
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