[Espy]

I used to use Opera back before they updated it -- it had a really nice "Hide" function that'd minimize the browser so it wouldn't even show up in the taskbar, useful for whenever my parents randomly appeared. It would still be running, and all the tabs were saved, though; it just hid itself in the "hidden icons" section of the taskbar instead of the taskbar proper.

I generally use Chrome now, though, since I'm mostly away from home, and my parents don't really scrutinize my laptop so closely anymore... It's pretty fast and easy to work with.