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Since you are using FF, I don’t know what you have for browser add-on’s, but you may want to consider looking at my signature…esp. to have NoScript since this would help you in the future.
You should also consider doing a free Secunia scan to see if your software is up to date http://secunia.com/vulnerability_scanning/personal/ since software changes so frequently. It is possible that your version of java needs an upgrade or another software, however there are still many security holes even after the upgrades.
Many of us run this scan weekly.
Let us know if you have any additional questions. Thank you.