If you want to get rid of x10 pop unders and all the other annoying pop ups plus bandwidth hogging ads, backgrounds, etc go here and try Ad-Subtract Pro:

[Link: adsubtract.com]

I've been using this product for a couple of years and, believe me, the web is now a better place. There's a 30 day free trial and then it costs US29.95.

Be aware that legitimate pop ups will be blocked, too but a simple customization by site will take care of getting the pop ups that you need.

Have not seen an x10 ad in 2 years. I have no affiliation with this company other than being an extremely satisfied customer.

Bob