Nowhere did OP say anything about a desktop. I thought they meant “what’s the current laptop equivalent to a Thinkpad back in the day?” If they meant a desktop, they should have used the word desktop. “PC” is not exactly specific.
Firefox.
Yes, it sadly is Chromium based.
Have a look at Vivaldi for Android.
Nowhere did OP say anything about a desktop. I thought they meant “what’s the current laptop equivalent to a Thinkpad back in the day?” If they meant a desktop, they should have used the word desktop. “PC” is not exactly specific.