How can I block all popups originating from a specific site?

You may have adware installed. Manual method.

Malware – Adware removal – Apple Support

Or download this program which was written by Thomas Reed, a long time poster. The program will do the work for you which makes it easy. If you are uncertain about downloading programs, try the manual method.

Malware Guide – AdwareMedic – 10.7 and higher

My pop up blocker is enabled

It doesn't block all popups, as you've already discovered. Your options are (1) not to visit that trashy website, or (2) to install ad-blocking software. I don't have a specific recommendation. The problem is not caused by adware.

That site is both illegal and is a source of adware. You may have become infected with adware through that site, in which case Eric's solutions should help. You may also just be seeing typical obnoxiousness to be expected from a site of that caliber.

If you continue to use that site, it will be at your own risk. Sooner or later, it will infect you with something. Start using legal sources for watching TV shows, such as Netflix, Amazon Prime, Hulu, etc.

sydneysandiego wrote:

A friend sent me that link. I didn't know it is illegal to watch videos on a website.

How can I tell if a website is "illeagal"?

The key here is, is the site purveying commercial video content for free? Anything that people would normally pay for - such as movies - would obviously qualify. TV shows would also qualify because, although you can watch them on TV for free, you are watching ads along with those TV shows, which is what allows them to be free. If a site offers free streaming of such content, it is illegal and run by criminals, and thus it's a dangerous site. Only use legit sites for streaming such content online, like Netflix, Hulu, Amazon Prime, etc.