How do I prevent other sites from adding links to my uploaded pages when I view them in the browser?

I upload (Dreamweaver) modified pages using CuteFTP to a Seanic server. When I view the pages using Firefox, links are "inserted" into keywords so that when I mouse-over, a small window appears from an unknown website with an ad related to the keywords. When I open my same page in IE, there are no "mystery" links appearing on the pages. What can I do to eliminate this problem?

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