I confirm this problem and it is causing even more problems for me in Ubuntu Lucid
Please, see https://bugs.launchpad.net/ubuntu/+bug/468266 https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/580814
Independently I tried the same workaround (converting to UTF-8) and it works just fine.
I confirm this problem and it is causing even more problems for me in Ubuntu Lucid
Please, see /bugs.launchpad .net/ubuntu/ +bug/468266 /bugs.launchpad .net/ubuntu/ +source/ firefox/ +bug/580814
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Independently I tried the same workaround (converting to UTF-8) and it works just fine.