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What is NSAppshell event window and how can I remove it? Have tried disabling all plug-ins and add-ons and it's still there and makes our computer slower than dial up!

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Whenever I log off of my computer I get a message "NSAppshell event window," which slows down the performance of Mozilla and anything else we're trying to run on our computer. We're forced to log off and on to reboot and this happens nearly all the time. We have tried disabling all add-ons and plug-ins, to no avail. We are using Mozilla 4.0. Thanks for any help you can provide, as we don't want to go back to using Internet Explorer if we can help it.

Whenever I log off of my computer I get a message "NSAppshell event window," which slows down the performance of Mozilla and anything else we're trying to run on our computer. We're forced to log off and on to reboot and this happens nearly all the time. We have tried disabling all add-ons and plug-ins, to no avail. We are using Mozilla 4.0. Thanks for any help you can provide, as we don't want to go back to using Internet Explorer if we can help it.

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I'd like you to upgrade to the latest version of Firefox, and tell me if that fixes your problem.