How do I keep my cats off of the internet?

I live alone with my three maine coon cats. My laptop never leaves my home office. For some reason, I see many adult website links in my web browser history. Again, it is just me and my cats at my house. I am a god fearing man, I would never visit such sites. It has to be the cats. I knew cats were smart, but... show more I live alone with my three maine coon cats. My laptop never leaves my home office. For some reason, I see many adult website links in my web browser history. Again, it is just me and my cats at my house. I am a god fearing man, I would never visit such sites. It has to be the cats. I knew cats were smart, but not this crafty. I need to figure out how to keep my cats off of the internet. Are there any tools or firewall systems I can use? It is really frustrating.
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