Hey OP: Firefox, Web of Trust, No Script, HttpS everywhere, and a half dozen other random odds and ends as the mood takes me. Then I spot check the history, and talk to them about why I am doing it. But I'm one of the less technical readers of /.
The rest of us: All of this, but with none of the hate. This is mostly a matter of style, and if OP wants to filter, let him filter. If someone else wants to monitor 24/7, let them do it. If naked guy wants to shut the door to his play room, more power to him for being able to afford a play room. We ought not scream about how his choosing to restrict is anti-freedom, 'cause that's silly. In the end I doubt it is going to lead directly to irreparable criminal degeneracy. I am young enough that I had internet porn, and I'm okay.
As to why I filter? I filter the real world for their safety: I put rails on their cribs, tell them the street is off limits till they learn to look both ways, and I filter their Internet. And when they start climbing out of the crib, asking to cross the street, or trying to circumvent my filters, then I know that it is time to move on. Hell, I give my 9 year old lock puzzles with prizes in them just to encourage puzzle breaking. And there are people out there wanting to hurt them, and trolls, and people wanting to scam them. If there weren't my kid wouldn't have spent 10 bucks on Cooking Momma ingredients, not knowing it was real money, before I noticed.
IIRC, one of the reports from the Freakonomics guys said it didn't really seem to matter what kind of parenting books you bought, as long as you were the kind of parent who bought parenting books.