After updating or installing Firefox, your Internet Security program may erroneously prevent Firefox from accessing the Internet.

This article describes how to configure the firewall component of McAfee Internet Security 2009 (McAfee Personal Firewall) to allow Firefox proper access.

Firefox must be removed from the firewall's list of programs and then added back:

1. At the top of the Firefox window, click on the Firefox button (File menu in Windows XP) and then click ExitOn the menu bar, click on the Firefox menu and select Quit FirefoxAt the top of the Firefox window, click on the File menu and select QuitAt the top of the Firefox window, click on the File menu and select ExitOn the menu bar, click on the Firefox menu and select Quit FirefoxAt the top of the Firefox window, click on the File menu and select Quit.
2. Click on the Windows Start button, and then select Programs > McAfee > McAfee Security Center.
3. In the left side of the window, click Advanced Menu.
   
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4. In the Advanced Menu, click Configure.
5. In the Configure menu, click Internet & Network.
6. In the main part of the Window, click Advanced....
   
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7. In the left part of the window that appears, click Program Permissions.
8. In the list of programs, find Firefox or firefox.exe and select it.
9. In the Action section, click Remove Program Permission and click Yes to confirm.
   
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10. Click Add Allowed Program.
11. Navigate to the Firefox installation folder (e.g. C:\Program Files\Mozilla Firefox\) and double-click firefox (firefox.exe).
12. Click OK to close the Firewall configuration window.
13. Click the X in the top-right corner of the Security Center window to close it.