This is strange but since I have updated to Ubuntu 12.04 LTS from 11.10, some websites simply refuse to open in Firefox browser. I have not been able to install any addon since the site itself does not load. Another important site i am unable to open is Wordpress.org.
I have tried opening them in Chromium and they are working just fine(So the network settings are fine, I guess). The problem seems to be limited to Firefox only and I want to resolve this issue than moving to another browser. Firefox is the only browser I intend to use.