Disable cursor hover feature?

Hello,

Was wondering if there is some way to disable the auto-open cursor hover feature? (Not sure what else to call it). It's driving me nuts. It's most disfunctional with Safari--for example when I'm trying to find a specific webpage in the Histor-- if I don't keep moving the cursor constantly, whatever URL the cursor happens to be over will just open and load. Then I have to start over again. This seems to happen sometimes on the desktop as well. Is there some way to get rid of it? Thanks for your suggestions.

Jen