The best way to prevent that is by disabling JavaScript. Generally, JavaScript is what enables such banners to popup and obstruct your vision with newsletter requests.
Javascript is like a knife. Do I want people who know how to use a knife in my house? Yes of course. Do I want people that stab other people in my house? No. Nowadays there are tools to leave those people outside your door.
It's time to end the association between javascript and bad web practices.
(I support several. Tuning sites where uMatrix or even uBlock breaks stuff is a constant chore.)
I use uMatrix. I appreciate the hell out of uMatrix. uMatrix is not the solution to the present level of abusive dark Web patterns.