Firefox won't close properly with symantec IPS 3.0 extension active

Hi, I have a problem with Firefox 5.0 not closing properly. After I close the browser it stays active as a process (firefox.exe*32) and I have to close that in Task Manager before I can open a new browser window. I've followed instructions on other posts and have found that by disabling all my firefox extensions and re-enabling 1 by 1 it's the Symantec IPS 3.0 that is causing the problem. There doesn't seem to be anyone else posting about this conflict and Norton says it needs to be left enabled.
Any ideas???

Perform the suggestions mentioned in the following articles:
* [[Firefox is already running but is not responding]]
-> Profile in use
* [http://kb.mozillazine.org/Profile_in_use]
Check and tell if its working.

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From your description, it seems that an add-on may me causing your issue. Follow the steps at [[Troubleshooting extensions and themes]] to test whether your extensions are causing this behavior. Reply back here with the results and with the name(s) of any extensions you have enabled.

Firefox won't close properly with symantec IPS 3.0 extension active

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