I keep getting an unexpected error (203) when trying to install plugins/themes.

I can download themes and plugins, but when I try to install them, I get
Firefox cannot install >>>>> We have experienced an unexpected error (203).
Please help???

See if this helps you: <br />
http://kb.mozillazine.org/Unable_to_install_themes_or_extensions_-_Firefox#Unexpected_installation_error_-203

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