Firefox in ubuntu is very slow

I was seriously doubting those who were the fans of firefox because whenever I logged in to Ubuntu and used firefox, my net connection was so slow. But with IE it was lightning fast. So I searched a bit and found the following solution which somewhat speeded it up a little bit.

1. Open a new tab by typing Ctrl-t
   (That’s the Ctrl key on your keyboard and the letter t key at the same time)
2. Enter about:config in the address bar of Firefox
3. Enter ip into the Filter: text box
4. Look for the network.dns.disableIPv6 entry in the table below the Filter: text box
5. Double click the network.dns.disableIPv6 entry
6. Restart Firefox

ref: http://techxplorer.com/2007/02/22/slow-browsing-using-firefox-on-ubuntu/