Link auto open in external browser

[Netwalker]

When I open some web pages in UR, pages also automatically open in IE (for example, http://www.makeuseof.com/dir/browser...rent-browsers/). This happens whenever the page contains a ShareThis.com link and other links also.

I only open the link in UR, I don't click on any of the links in the page to cause the external pages to open.

How can I prevent this annoyance?

My UR browser settings are attached.