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Showing content from https://support.mozilla.org/en-US/kb/update-mcafee-and-firewall-settings-allow-firefox-access below:

This article is no longer maintained, so its content might be out of date.

This article applies to users with McAfee 2010-2011 products on Windows XP, Windows Vista, and Windows 7. For instructions on configuring other security software, see Configure firewalls so that Firefox can access the Internet.

After updating or installing Firefox, the firewall included with McAfee may erroneously prevent Firefox from accessing the Internet.

In order to fix the problem, you must update McAfee Security Center and reset its firewall settings.

Resetting firewall settings

Follow these steps to reset McAfee's firewall settings to ensure that Firefox is able to connect.

Click on the Windows Start button, and then select . (This may be called McAfee Internet Security, McAfee Total Protection, or McAfee AntiVirus Plus).
On the left side of the McAfee window, click .
On the right side of the McAfee window, click the Settings link.
Press Restore Defaults.
Close McAfee Total Protection and start Firefox again.

Updating McAfee Products

If McAfee hasn't been updated today, follow these steps to make sure you have the latest update.

Click on the Windows Start button, and then select . (This may be called McAfee Internet Security, McAfee Total Protection, or McAfee AntiVirus Plus).
On the left side of the McAfee window, click .
On the right side of the McAfee window, click the Check for updates link.
Wait for the updates to complete. This may take several minutes.
You may be asked to restart the computer. If this happens, return to this page after restarting and complete the instructions in the "Resetting firewall settings" section above.