Problems with internet browsers opening many tabs

While searching the internet both firefox and chrome will start opening 20 to 30 tabs of the same page. It also opens a tab of any link you scroll your mouse over. Has anyone else came across this problem? Please help. Thanks in advance.

miles01110 said:

What mouse are you using?

Click to expand...

I'm using the mac mouse with the scroll dot button. The computer is an iMac using MacOSX.

Thanks for any help.