More problems with Safari

When accessing Yahoo mail with Safari, it tended to "hijack" Safari - when it finished loading, it would automatically become the active tab. This is VERY irritating, since I'm usually checking Gmail when Yahoo is loading. Just when I click on the Gmail tab, Yahoo becomes the active tab and I end up clicking on the wrong tab. I've found Yahoo doesn't do this on Firefox. Could it be a problem with Safari instead of Yahoo?