"Back" not working on browser

Some sort of "widget" is taking over all sorts of web sites, it seems. A few weeks ago, I noticed that some web pages wouldn't allow "Back" to work on my browser. When I hit the down button for back, there'd be a "widget.pulsemgr.com..." address between my search results and the page I'd gone to.

Lately, I'm encountering that "widget" on more and more sites. Multiple widgets on some -- 3 or 4 between search results and the actual page. Since it finally became too annoying to overlook, I added the widget.pulsemgr.com address to my restricted site (Tools -> Internet Options -> Security tab).

Now "Back" works properly again, I'm content.