How to stop betting tabs opening in Google Chrome?

When I run Google Chrome browser an unwanted betting site opens, e.g. http://www.profitboosterapp.com/licence-b312/?t=NcYL5050GH66c680b97b09bae6afa3ccc6dfb6a078e72e7c98.

If I am watching a video, this unwanted site interrupts the video - how can I stop this.?