I honestly wouldn’t worry that much about it, the different tabs are working in their own environments that makes it more difficult for info from one to be taken by another, if you use any basic opsec, i.e. closing unnecessary tabs, different user names/passwords, a vpn, even a freepn you should be okay. If you’re still worried about it you could use a temporary card (something like privacy.com), you could also use tor for your piracy, if it’s not the most secure browser its up there. Just be ready for slower download speeds.

If you’re using firefox on desktop your tabs are sandboxed and should be isolated from each other. It is possible to break that sandboxing though.

I had been dual booting bazzite for about a year, up until last weekend when it borked and I wound up just reinstalling. I just deleted everything and went pure linux. Still bazzite, still a little scared of the terminal, but windows is completely gone from my computer.