Use a personal proxy server.
I can't recommend this enough. Means you don't have to use Firefox or Opera if you don't want to (but personally I do), as the controls they offer over your browsing FAR SURPASSES that offered by any browser today.
Plus, the two I'll list below are
entirely free.
Both are very easy to setup; don't be put off.
www.proxomitron.info (the one I use)
www.privoxy.com
Mr Mephisto
PS - You'll never look back...