Some website always has pop up ad on the lower right corner. To remove it, simple: 

Go to your browser's: 

Settings

Site permissions

Notifications

Block > Add 

type in the website which always gives you the pop up ad., such as: 

https://www.xxxx.com  

that's all. 

用上面的方法 各种网页浏览器都可以适用。 有问题可以在下面留言 或者发信息给我。祝成功 愉快。