Firefox & opera slow responding in opening pages while chromuim working fine !!

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http://www.linuxquestions.org – I have 2 internet connections from 2 different ISP: 1- At home and its working fine for all browsers on ubutnu 10.04 and windows 7. 2- At work, there is a problem with the browsers on ubuntu. Firefox and opera respond so slow in opening webpages (you have to wait for like 5 seconds until the page starts to load) in the other hand chromium browser works like a charm, pidgin, skype and vuze to download torrent is working fine. I tried firefox in windows 7 on the same laptop and its working perfect without any issues. I tried firefox beta 4 on ubuntu to see if it can help but its the same slow (HowTos)