Download OK but can't install Zotero

Hello Zotero community:
I can download the Zotero .xpi file, which automatically tries to install. I keep getting a -203 error reported. I'm running Firefox 3.0 on an iMac Intel with OS X 10.4.10. This problem has surfaced only with my user account, not with my main account. Any workarounds you guys can suggest would be appreciated.
  • Please try the installation suggestions here.

    If that does not help you might take a look at what Mozilla has to say about the 203 error here.

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