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FF4 conflicts with Comcast & Comcast security pgm (Norton). How can I go back to earlier FF3.6?

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I tried to install FF4. It conflicted w/comcast internet program and with their Norton Security program. I then downloaded Google Chrome and uninstalled FF3.6. Google Chrome is tying up everything so I want to replace it with the old FF3.6 but I can't find a way to get and install it. Can you help?

I tried to install FF4. It conflicted w/comcast internet program and with their Norton Security program. I then downloaded Google Chrome and uninstalled FF3.6. Google Chrome is tying up everything so I want to replace it with the old FF3.6 but I can't find a way to get and install it. Can you help?

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