Need some help...

Im having an issue with my powerbook. Certain websites will shut down my safari once i visit them for a reason i can not figure out. I have noticed it only shuts down on specific sites, nyspeed,facebook, and a few others. Everywhere else safari doesn’t give me any trouble at all. No, i do not watch porn on this or go to other weird sites. It’s mostly used for homework and forum browsing. I don’t have crazy amounts of programs or anything like that either. Im just stumped and im not that advanced with computers to begin with, so i was hoping someone will know a lil better than i do…

Thanks