Most of the replies are missing the point. You do not only want to
protect the rest of your system from your browser. You also want to
avoid your browser doing anything an attacker wants when he finds an
exploit in it.

If you try to solve the problem with virtualization, different users or
another solution like that, you would have to run multiple browsers for
different sites to avoid browser exploits causing trouble. Of course, it
is always better to run network applications as a different user than
yourself, but browser exploits are somewhat hard to contain that way
since the things attackers want may be in the browser itself (cookies
or, hopefully not, saved passwords).

I have to restate what I wrote in another thread: looking at the
security record of the popular browsers it is scary we use them for
online banking and other security-critical functions so carelessly in
our everyday life.

-- 
Jussi Peltola

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