Just updated firefox, every time I open it I get a message about a java script application

The message says
[Java Script Application]
can't create mcaffee plug-in object. TypeError: Components.classes[cid] is undefined

That indicates that you are using an add-on that is not compatible with Firefox 4. For details of how to troubleshoot this to find out what one is causing the problem see https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes
For chloe_am it indicates the version of McAfee add-on is not compatible.

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Greetings,
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Safari>Pereferences>Extensions
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HI. I just got a new macbook pro 15".
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Please read this whole message carefully, especially the warnings, before doing anything.
1. The changes to your configuration suggested here should be considered provisional; they may not solve your problem, or they may remove functionality that you find useful. If a third-party system modification that you want to keep is causing the problem, seek help from its developer.
2. WARNING: Back up all data now if you haven’t already done so. Before proceeding, you must be sure you can restore your system to its present state, even if it becomes unbootable. If you’re not sure you can do that, STOP — DON’T CHANGE ANYTHING. If you’re dissatisfied with the results of the procedure suggested below, restore from your backup. I will not be responsible for the consequences, and I will not be able to help, if you ignore this warning.
3. You should either remove or update the following system modification(s), if an update is available from the developer:
Parallels
and definitely remove at least the following:
Boom
† MacKeeper
† VirusBarrier
4. Whatever you remove must be removed completely, and (unless otherwise specified in this message) the only way to do that is to use the uninstallation tool, if any, provided by the third-party developers, or to follow their instructions. If the software has been incompletely removed, you may have to re-download or even reinstall it in order to finish the job. I can't be more specific, because I don't install such things myself. Please do your own research.
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Note: These instructions apply to the version of the product that I downloaded and tested in early 2012. I can't be sure that they apply to other versions, nor do I intend to repeat the test.
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Do not try to uninstall by dragging the MacKeeper icon in the Dock or the LaunchPad to the Trash.
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The more actively promoted the product, the more likely it is to be garbage. The most extreme example is the “MacKeeper” scam.
The only software you should install is that which directly enables you to do the things you use a computer for — such as creating, communicating, and playing — and does not modify the way other software works. Never install any third-party software unless you know how to uninstall it.

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Basically none.
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Looks like:
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Scott Cromwell
[email protected]

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[[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]]

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Just updated firefox, every time I open it I get a message about a java script application

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