http://en.wikipedia.org/wiki/Firesheep

Firesheep was developed to display the possibility of a website having a secure login shift to a non-encrypted page and exposing the user to session hijacking vulnerabilities. IOW, using HTTPS for the login and then sending the user to regular HTTP pages afterwards

If you're not logging in to that website, I don't understand why Firesheep would raise an alert. IMO, that extension isn't needed any longer - the webmasters who care about their users would have fixed their website years ago, and the webmasters who don't care and haven't fixed it yet won't do anything at this late date. Nothing the user can do about websites that raise an alert like that, except to "know" to avoid those websites in the future.

You may want to ask your school's IT department about why you are getting that alert, and see what they say about it.

debrachski said

I work at an extension campus for a community college and have never had this problem before when searching the college's library catalog. Every time I click to open a book record or see the next page in a list of books, this Security Warning box appears. That is a lot of unnecessary steps to delete this box every time. joanie 11/16/10 6:02am is the answer I looked at for my problem.

Thank you for your suggestion. I have already contacted IT and they have not been able to solve the problem. Now it is happening on the main campus and IT has been asked to look at the problem again.