- Options -> Settings
- Advanced
- Under Privacy and Security -> Site Settings
- Pup-ups and redirects
- Set the first option to Blocked (recommended)
- Under Block -> Add
- Add the website you want to block from sending you pup-ups
To specifically allow a website to send you pop-ups:
- Set the first option to Allowed
- Under Allow -> Add
- Add the website you want to specifically allow to send you pop-ups