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Firefox 5 got rid of my McAfee security which I need to work

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When Firefox 5 was installed this evening, it said that McAfee 3.3.1 (I believe) was not compatible, but I need my security system to work on the web without excessive danger. Therefore, I need to either have a compatible McAfee found ASAP, or I need to be returned to my previous version of Firefox, so I can keep my McAfee service ASAP. Please respond ASAP and thanks.

When Firefox 5 was installed this evening, it said that McAfee 3.3.1 (I believe) was not compatible, but I need my security system to work on the web without excessive danger. Therefore, I need to either have a compatible McAfee found ASAP, or I need to be returned to my previous version of Firefox, so I can keep my McAfee service ASAP. Please respond ASAP and thanks.

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If not solved within 12 hours, change back to previous version of Firefox.

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See the McAfee forum for more information about the Site Advisor being disabled.
https://community.mcafee.com/message/195191#195191