I thought this was going to be related to time-travel, not browsers. Well, it's not really an issue for me. I'm the only one who uses this computer, and I do a pretty good job of hiding and disguising my "valuables" regardless. I never use the browser that's right on my desktop whenever I'm looking for more exotic entertainment, so it's highly unlikely that anyone will come across my browser history for that stuff.
Besides, I'm the only one in this house whose all that computer-savvy. I doubt my mom even knows what browser history is.