Some URLs does not open in Firefox

[AG]

Binary package hint: firefox

Some websites does not open/load in Firefox.
Here are list of some of them:
1) www.hotmail.com
2) http://thepiratebay.org
3) www,tennis-warehouse.com

When nslookup for these sites, IP are returned.
When URL is accessible using IP still, the page does not load. The progress bar progresses and then stops.
The page does not load. It shows "Page title" but nothing is loaded.

These sites are accessible from windows.

I also tried entering google DNS as well as OpenDNS but same behavior is observed.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: firefox 3.6.12+build1+nobinonly-0ubuntu0.10.04.1
ProcVersionSignature: Ubuntu 2.6.32-25.45-generic 2.6.32.21+drm33.7
Uname: Linux 2.6.32-25-generic x86_64
Architecture: amd64
Date: Tue Nov 16 20:32:39 2010
FirefoxPackages:
 firefox 3.6.12+build1+nobinonly-0ubuntu0.10.04.1
 firefox-gnome-support 3.6.12+build1+nobinonly-0ubuntu0.10.04.1
 firefox-branding 3.6.12+build1+nobinonly-0ubuntu0.10.04.1
 abroswer N/A
 abrowser-branding N/A
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
ProcEnviron:
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: firefox

[AG (gore-amit)]

I also tried accessing the same sites using Opera. And same behavior is observed.

[dino99 (9d9)]

closed version