There are plenty of legitimate reasons for wanting a private browser mode. Maybe you're on a shared device and you don't want to leave history. Maybe you're concerned that you're being watched by shadowy government alphabet organizations (and you are). But let's be honest with ourselves here: the most common reason for using Incognito or private mode is porn. Not that there's anything wrong with that.

On the other hand, it's kind of a pain to switch between standard and private modes in any browser, making you less likely to actually use the privacy/security/monkey-spanking feature. To that end the makers of Dolphin Browser have released Dolphin Zero, a mobile browser that's all-private, all the time. It's just like that place out on the highway that's open 24 hours, with parking in the rear.

Dolphin Zero uses the same rendering engine and most of the same UI and navigation features as Dolphin Browser, but does not collect or store history, form or input data, passwords, cached files, cookies, location data, or even favicons. (Of course you can always mess that up by saving files to your device's storage. You know. For later.) The app should get updated right along with Dolphin Browser where applicable. Dolphin Zero is compatible with Android 2.2 or later, and like this post, is rated "low maturity."