Why does Firefox disappear from the bottom Taskbar of open programs even though it is open and running?

This just started happening...I open a regular/consistent number of programs every morning and lately my Firefox browser gets hidden behind the other programs in the bottom taskbar (next to the start button in Windows XP) where open programs reside. It's like the program is no longer running but it is. What has suddenly caused this and how can it be repaired? If it cannot be repaired I will unfortunately have to go back to using Internet Explorer :(

Turns out it was firewall related. Even when I turned the firewall off and rebooted, it didn't help. I finally had to uninstall Avast antivirus, and then everything worked great.
To anyone else who has this issue with Avast and iTunes/Bonjour, I also found this thread that might be worth trying:
https://discussions.apple.com/message/16897494#16897494

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