somewhere in the 100-200 realm. almost none of which are porn related usually, aside from 1-2 at a given moment where I am actively looking for new VNs or the like. I just can't be assed to bookmark the things I read.
I try to never leave more than 5 tabs open at any given moment, but I'd also like to add I'm easily the most depraved person of my friend groups and they all have many more tabs open than I do. I used to have issues with clutter in real life and I try to deal with them in every way I can.