X-privacy initiates private browsing if it detects a server sending a
X-privacy: Private header.
"I had this idea that for websites that report crime or child abuse, anonymity is extremely important and a lot of people don't have a clue to start up a Private Browsing session themselves [...]" (Philip Clarke)
- load requested X-Private site when switching to private browsing
- implement popup for asking to switch to private browsing