IE works fine with iTunes U, but if I try to load any section of iTunes U courses with Firefox, I always get an error message.

The error message always takes the following form (the particulars at the end differ for each university offering iTunes U courses):
Firefox can't find the file at itms://deimos3.apple.com/WebObjects/Core.woa/Browse/berkeley.edu?ignore.mscache=3228344.

unfortunately the fiddler2 issuer in certificates might be a sign of unwanted software present on your pc that is intercepting secure network traffic. please go into the system control panel and uninstall programs like BrowserSafeguard, BrowserSafe, SafeGuard or other software that sounds suspicious and didn't get installed by you intentionally.
<br><sub>reference: https://support.mozilla.org/en-US/questions/982532#answer-520145</sub>
afterwards, run a full scan of your system with different security tools like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes] & [http://www.bleepingcomputer.com/download/adwcleaner/ adwcleaner].
[[Troubleshoot Firefox issues caused by malware]]

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    Please read this whole message before doing anything.
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    Launch the Terminal application in any of the following ways: 
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    Step 1 
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