I don't know about the other problems but when you enlarge an image on some sites, Jaycar in particular, the enlarged image is displayed in a popup window. By default, Firefox blocks popups. You can change this or specify exceptions from the Firefox menu under "Tools", "Options", "Content".
I couldn't get Google Street View to work in Firefox until I specified maps.google.com as a popup exception (plus a couple of other google map addresses).
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