A few months ago, my credit card number was used in a few unauthorized transactions. The charges were reversed, and I got a new card, so overall, no big deal. But I am curious as to how the thief actually got their hands on my information.

Are there any lookup tools for leaked credit cards, similar to Have I Been Pwned, that might tell me how my credit card number was exposed? Since my card has already been cancelled, I don't even mind typing the number into a somewhat sketchy site.

I'm getting a little bit worried these days about the tracking features in chrome and was looking into Zen Browser. Does anyone here use it? Any thoughts?
Also looking for any simple non tracking browser alternatives!