I see z.moatads.com and optimatic.com at pingdom waterfall

Hello,
When I activated this plugin, I see moatads.com and optimatic.com entries at pingdom waterfall list.
When I deactivated Facebook Page Promoter Lightbox, they are disapperar.
When I googled, both moatads and optimistic are defined browser hijacker.
When I look at browser extensions, I couldn’t find them. I also din’t find them at regedit.
What could you advise?
Regards

https://www.ads-software.com/plugins/facebook-page-promoter-lightbox/