I have been using it for more than a week and now am worried about the consequences that I am not sure are true or not!
I am worried that by allowing random users to surf using my network to prevent surveillance, someone will use my address to do malicious things, and I will get into legal consequences. Also, what if many services blacklist my IP address so eventually I get a lot of restrictions in my browing experience.
Furthermore, will this extension increase my fingerprint?
Are these thoughts valid, or am I just overthinking? If anyone knows, please comment.
Can the ISP see the websites the other person is visiting?
No, but they see that you are connected to a tor entry node and that someone is sending you data. From this they can conclude that you are running a tor proxy.