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Trogen.Webkit!html found in Firefox profiles. What dose this mean?

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Norton Internet Security found this virus on my PC in the Firefox Profile directory. The virus was deleted. What was the origin of the virus?

Norton Internet Security found this virus on my PC in the Firefox Profile directory. The virus was deleted. What was the origin of the virus?

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Many viruses will attack your web browser (not just Firefox, all of them) in an attempt to steal private information.

You can do the following to remove it:

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If this was in the Cache then it was harmless while in Cache.