Firefox URL encoding

Hi,

How is firefox supposed encode entered URLs with international (non
US-ASCII) characters?

I'm observing that my firefox 1.0.7 encodes the characters with
iso-8859-1, probably because it's the default charset on my OS, but
according to http://www.ietf.org/rfc/rfc3986.txt it should be encoded
with UTF-8.

MSIE 6 also seems to encode with UTF-8. This means that it's impossible
to configure a web server to accept requests from both browsers
correctly, unless people change their firefox settings (if such a
setting exists - haven't checked).

Am I missing something here?

Thanks,

-dennis