Most of my icons (e.g. Amazon book pictures) have disappeared. How do I get them back?

Recently, most of the icons that signify specific sources or locations or actions on web pages in my browser have stopped appearing. I get either no image or only generic gray icons (like a document icon). It makes most sites (e.g. like Amazon) nearly unusable. I don't think I've made any changes recently in my browser or my system. What has happened and how can I get my icons back. (BTW, I am NOT having this problem with Internet Explorer.) I am using Firefox 17.0.1, with an up-to-date Windows 7.

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