How do I block access to specific websites?

newdude

Registered
Hi,
I'm new to macs. On my PC, I was able to block access to specific websites, however, I have no clue how to do so on my mac. I use Safari, sometimes Firefox as my browser. I don't want to block pop-ups or anything, just want to prevent access to certain urls.

Thanks for your help.
J
 
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